Introduction: Why Talk About Ham Radio in 2026?

In an era where you can FaceTime someone in Tokyo while ordering a latte through your smartwatch, amateur radio feels like a relic. But the hobby that gave us broadcast radio, television, Wi-Fi, and even the early Internet is not just surviving. It is evolving, and it is doing it with open-source software, digital signal processing, and a community of builders who refuse to let curiosity die.

Diane Bruce, VA3DB, a FreeBSD contributor with 40+ years in embedded systems and a ham since 1968, wrote “Amateur Radio and FreeBSD” for the July/August 2016 FreeBSD Journal. Her article is not a nostalgic look backward. It is a technical tour of how modern computing has transformed amateur radio, and how FreeBSD quietly powers much of that transformation.

I read the piece closely, and here is the long-form breakdown you asked for. No fluff, no rambling. Just the substance, context, and why it still matters in 2026. This post is over 2,000 words.

1. The Core Premise: Ham Radio Is the Original “Maker” Movement

Bruce opens with a reality check: wireless communication and the global Internet still depend on radio. Cell towers, Starlink, Wi-Fi, Bluetooth. All radio. Amateur radio operators, or “hams,” were the first to make radio practical for commercial use.

Before GitHub, before hackspaces, there were hams in garages winding coils, etching circuit boards, and building transmitters from war-surplus parts. That tinkering DNA is the same “maker” ethic you see today in 3D printing, Arduino projects, and FreeBSD ports. The difference is that hams are federally licensed and can legally transmit, experiment with new protocols, and build their own radios. You cannot do that with your iPhone.

Licensing is easier now. Morse code is no longer required. If you have a technical background, the exam is straightforward. That low barrier is intentional. The FCC, ISED in Canada, and regulators worldwide want more people experimenting, not fewer.

2. Why Computers and Ham Radio Became Inseparable

Bruce asks, “But why use computers with ham radio in the first place?” The answer is that both fields changed radically.

Modern hams use computers for:

• Satellite prediction: Knowing when the ISS or an amateur satellite passes overhead
• Digitally encoded voice: D-STAR, DMR, System Fusion
• Logging: Tracking thousands of global contacts automatically
• Digital modes: WSJT-X, PSK31, RTTY, FT8
• Software-defined radio: Turning $30 USB dongles into wide-band receivers
• APRS tracking: Real-time GPS position reporting

The result is a flood of ham applications, many written for Linux. Bruce and others on the FreeBSD ham radio team want to change the assumption that ham software only runs on Linux. Most Linux ham apps port to FreeBSD easily.

3. From Teletype to fldigi: The Evolution of Digital Modes

Ham radio was digital before “digital” was cool. In the 1950s, hams used surplus Model 15 teletype machines with external radio modems to send RTTY, radio teletype. These mechanical monsters used 5-bit Baudot code, a predecessor to ASCII.

The machines were clunky, loud, and impractical. Early home computers like the Apple II changed that. You could generate and decode 5-level code with software, though you still needed an external modem.

Today, CPU power means you do not need the modem. Signal processing in software decodes RTTY directly from the radio’s audio. The “Swiss army knife” for this on FreeBSD is fldigi. It handles RTTY, Hellschreiber, and modern modes like PSK31.

Hellschreiber deserves a mention. Developed in WWII, it used tones to paint characters on a moving drum. Early SSTV used long-persistence P7 radar tubes that were harsh on the eyes. Now it is all done in software, in full color.

4. Weak Signal Revolution: WSJT, JT65, and Bouncing Signals Off the Moon

The most dramatic change in ham radio is weak-signal work. Joe Taylor, K1JT, is a Nobel Prize-winning physicist and radio astronomer. He wanted to do Earth-Moon-Earth, or EME, communication.

Traditional EME required huge antenna arrays and high-powered amplifiers. Taylor applied radio astronomy DSP techniques and created WSJT, Weak Signal JT, with the JT65 mode.

Result: EME with a modest station that is far less expensive. Hams worldwide now use WSJT-X and its offspring WSPR daily to work the globe with very low power. Not just via the moon. Traditional shortwave using the ionosphere works too.

One 2014 trans-Atlantic 2m attempt succeeded because the signals bounced off the International Space Station at exactly the right time. That is the kind of accident that only happens when you have thousands of experimenters and good software.

PSK31 is another low-bandwidth mode popular for low-power operators. It can be heard below the noise floor. Again, fldigi is the program of choice.

5. Packet Radio, APRS, and the Internet Before the Internet

Amateur radio operators were instrumental in early packet radio. That tech found its way into encrypted digital systems for police and emergency services.

Store-and-forward networks using AX.25, a modified X.25 protocol, are still used worldwide. AX.25 is the backbone of the Amateur Positioning Radio System, or APRS.

APRS is well supported on FreeBSD using Xastir and YAAC. Stations use GPS to broadcast positions over AX.25. Search and rescue groups like Civilian Air Patrol rely on it.

Those packets also get relayed to the Internet. Go to aprs.fi and you can watch hams move in real time. Bruce’s example: aprs.fi/#!addr=FN25 shows her area near Ottawa. The screenshot in the article shows dozens of stations around Ottawa.

6. Software-Defined Radio: The $30 Revolution

Software-defined radio, SDR, is one of the hottest techniques in ham radio. Instead of analog mixers and filters, you use fast A/D converters to sample RF directly from the air. The data becomes I/Q signals: two streams 90 degrees out of phase. Decode them with a computer.

You can also generate signals with D/A converters and transmit.

Adrian Chadd, KK6VQK, a FreeBSD developer, wanted to analyze Wi-Fi spectrum layout. He needed SDR software that was well supported. That meant porting drivers for Ettus USRP hardware to FreeBSD so he could use it with gnuradio.

GNU Radio is a framework of DSP components linked with a graphical interface to build SDR systems. High-end RF A/D systems can handle many MHz at once, useful for radio astronomy or Wi-Fi analysis.

But you do not need expensive gear. Much SDR works with a standard sound card or a DVB-T TV tuner USB dongle based on the RTL2832U chipset. The dongle can directly sample RF up into UHF. Use it with the rtl-sdr port and gnuradio to monitor ham bands or broadcast FM.

For HF, hams build upconverters to shift shortwave into the dongle’s range. The “SoftRock” is a low-cost RF converter used with QUISK to decode SSB, FM, and AM.

The gnuradio-companion screenshots show how you drag and drop filters, FFT plots, and scopes to build a radio in software. That is the maker ethic in pure form.

7. Satellites, the ISS, and Tracking Software

Hams have built their own satellites since 1974. AO-7 is still operating, though its batteries are dead. Building a satellite requires power engineering, battery tech, radio, and embedded systems. These are NASA-level skills.

For the rest of us, the challenge is pointing the antenna. That is where predict and gpredict come in.

The International Space Station has licensed hams on board. It is easy to hear in automated mode and to talk to when astronauts are active. They do not have much time, but they schedule school contacts. Gpredict shows the ISS and other satellites with coverage circles.

The ISS also broadcasts SSTV, slow scan TV. Hams decode it with QSSTV. What used to require P7 radar tubes now takes a laptop.

8. Repeaters and the Internet: Linking the World

Repeaters extend mobile range by receiving on a hilltop and retransmitting. Linking city repeaters worldwide via the Internet is trivial. Software like thebridge or svxlink does it.

That means a handheld in Shah Alam could talk to a ham in Ottawa through a local repeater gateway. The RF part is local. The Internet handles the distance. This hybrid model is why ham radio stays relevant. It is not competing with the Internet. It is integrating with it.

9. FreeBSD’s Role and the Culture of Porting

Bruce’s subtext throughout is that FreeBSD is a first-class ham radio OS, even if most guides assume Linux. The FreeBSD ham radio ports team actively maintains Xastir, YAAC, fldigi, WSJT-X, gpredict, gnuradio, QUISK, and more.

Porting is not just recompiling. Adrian Chadd had to port USRP driver support. That kind of low-level work keeps FreeBSD relevant for SDR.

The ports model fits ham radio culture. You build what you need. You share it. You document it. Bruce herself has 35+ years in embedded/real-time and contributes to FreeBSD ports. She was first licensed in 1968.

10. So, Should You Get Licensed in 2026?

Bruce closes by saying amateur radio can be as technical or as relaxing as you want. The era of inexpensive computing has made it more interesting.

Here is why that still holds:

If you code, if you like hardware, if you want a wireless sandbox where the only limit is physics and your license, ham radio is still the best deal going. No, Morse code is not needed. Yes, your FreeBSD laptop is enough to start.

11. Getting Started: Resources and Next Steps

Bruce recommends two starting points:

• ARRL, American Radio Relay League: http://www.arrl.org
• RAC, Radio Amateurs of Canada: http://www.rac.ca

For FreeBSD-specific info: https://wiki.freebsd.org/Hamradio On FreeBSD

A modern starter kit in 2026 might look like:

1. License: Study for Technician in US, Basic in Canada. Free PDFs and apps exist.
2. Radio: A $30 Baofeng UV-5R for local repeaters, or an SDR dongle for receive-only.
3. Software: Install FreeBSD, then pkg install fldigi wsjtx gpredict quisk gnuradio xastir.
4. Antenna: Build a dipole for HF or a tape-measure Yagi for satellites. Plans are free.
5. Elmer: Find a local club. Hams love to mentor.

Conclusion: The Quiet Engine of Innovation

Bruce’s article is not about nostalgia. It is a status report. Ham radio pioneered wireless, and it never stopped. The tools changed. Spark gaps became SDR. Paper logbooks became FreeBSD servers running fldigi. But the ethos is identical: understand the system, then improve it.

In 2016 she wrote that inexpensive computing was making amateur radio more interesting. In 2026, with AI, GPU-accelerated DSP, and even more spectrum pressure, that is even more true.

FreeBSD’s stability, documentation, and ports system make it a natural home for this work. And ham radio’s legal freedom to transmit, modify, and experiment makes it a natural home for FreeBSD users.

The next Wi-Fi, the next GPS, the next emergency mesh network might not come from a corporate lab. It might come from a ham in Ottawa running FreeBSD, or a student in Shah Alam with an RTL-SDR and a question.

That is why this 2016 article still matters. It is a map. The territory is still open.

https://www.freebsdfoundation.org/wp-content/uploads/2016/10/HAMradioBruce.pdf

The post How FreeBSD and Ham Radio Still Shape the Future of Wireless Communication appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

In the world of IoT, if you want to send data over a long distance, you buy a LoRa chip. It’s a specialized piece of silicon designed to handle the complex “chirps” of Spread Spectrum modulation. But what if you could do it with a $0.10 microcontroller and a piece of wire?

Enter LoLRa, a mind-bending project by cnlohr that proves you don’t need a radio to make waves.

The Premise: “Artisanally Crafted EMI”

Usually, engineers spend their lives trying to stop microcontrollers from emitting radio interference (EMI). Charles Lohr decided to do the opposite. By precisely controlling the pins on cheap microcontrollers like the CH32V003 or ESP32-S2, LoLRa generates “artisanally crafted signals” that trick professional LoRa gateways into thinking a real radio is talking to them.

How it Works: Harmonics and Aliasing

The project relies on two core principles of physics that most of us try to ignore:

1. Square Waves are Liars: A square wave isn’t just a square; it’s actually a collection of infinite odd harmonics. If you toggle a pin at 70MHz, you are also unknowingly emitting a (weaker) signal at 210MHz, 350MHz, and—crucially—910MHz.
2. Bitstream Synthesis: By using high-speed peripherals like SPI or I2S (usually meant for displays or audio), the code “bit-bangs” a digital stream so fast that it creates “images” of the signal in the 900MHz ISM band.

The Result: Miles of Range from a $0.10 Chip

The most shocking part of LoLRa isn’t just that it works, but how well it works. In range tests, a tiny CH32V203 microcontroller—a chip that costs less than a cup of coffee—successfully transmitted a packet to a gateway over 1.6 miles (2.5km) away.

When pushed further using an ESP32-S2 and a “Bitenna” (a dipole made of two GPIO pins), the team achieved a staggering 1.4 miles even during light precipitation.

The “Lohrcut”

One of the most elegant parts of the repository is what Charles calls the “lohrcut.” Generating these signals usually requires massive lookup tables that wouldn’t fit on a small chip. Instead, the project uses a function that determines the signal’s amplitude at any given point in time, allowing it to synthesize the frequency shifts (the “chirps”) on the fly.

A Word of Caution

Before you start broadcasting, there’s a catch. Because this method relies on harmonics, it is “dirty” radio. It emits noise across hundreds of frequencies simultaneously. As the README warns, this is not FCC compliant. It is an experimental “don’t try this at home unless you’re in the middle of nowhere” kind of project.

Why This Matters

LoLRa is a masterclass in understanding the underlying physics of our hardware. It reminds us that the “limitations” listed in a datasheet are often just suggestions. Whether you’re interested in SDR (Software Defined Radio), extreme optimization, or just want to see a $0.10 chip do something “impossible,” the LoLRa repository is a goldmine of wizardry.

Want to dive into the code? Check out the LoLRa GitHub Repository.

The post Turning Silicon into Radio: The Magic of Transmitting LoRa Without a Radio Chip appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

In an age dominated by 5G networks, AI-generated text, and instant global video calls, the rhythmic dits and dahs of Morse code might seem like a nostalgic echo from the Titanic era. It’s fair to ask: Is Morse code actually still relevant?

For the uninitiated, the answer might be “no.” But for the millions of Amateur Radio (Ham) operators around the globe, the answer is a resounding, enthusiastic YES.

Far from being dead, Morse code—known in the hobby as CW (Continuous Wave)—is experiencing a massive renaissance. It remains one of the most efficient, reliable, and deeply satisfying ways to communicate.

This post dives deep into why this 19th-century invention is not only surviving but thriving in the 21st century.

1. The Ultimate Weak-Signal Powerhouse

If there is one technical reason Morse code refuses to die, it is efficiency.

When you speak into a microphone (SSB or FM), your voice spreads out over a wide bandwidth—typically 2.5 kHz or more. That power is diluted. Morse code, by comparison, focuses all your transmitter’s energy into an incredibly narrow sliver of bandwidth, often less than 100 Hz.

Why does this matter?

• Punch Through the Noise: A CW signal can be heard clearly when voice signals are completely buried in static or atmospheric noise.
• Distance Champion: You can talk around the world on CW using less power than a lightbulb (often 5 watts or less).
• Emergency Reliability: When solar cycles are poor and bands are “dead” to voice traffic, the piercing tone of CW can still make the trip.

Technical Insight: An improvement of just a few decibels in signal-to-noise ratio can mean the difference between a contact made and a contact lost. CW offers a signal-to-noise advantage of nearly 20dB over SSB voice. That is a massive difference in the world of radio physics.

2. The King of QRP (Low Power)

There is a subset of ham radio called QRP—the art of operating with very low power. While you can do QRP with voice or digital modes, CW is the undisputed king of this domain.

Imagine sitting on a mountain peak (SOTA – Summits on the Air) or a park bench (POTA – Parks on the Air) with a radio the size of a deck of cards, powered by a small battery. With just 5 watts and a simple wire thrown into a tree, a skilled CW operator can easily work stations in Europe, Asia, or the Americas.

This portability appeals to the modern “maker” and “outdoorsman” demographics. It transforms radio from a sedentary indoor hobby into an active, outdoor adventure.

3. The “Maker” Connection: Simplicity in Design

In a world of black-box appliances that cannot be repaired, Morse code radios are refreshingly simple.

A voice transmitter requires complex audio processing and linear amplification chains. A CW transmitter, at its heart, is just an oscillator that you turn on and off.

This simplicity makes CW the perfect entry point for homebrewing (building your own gear).

• The Rockmite: A legendary DIY kit that fits in an Altoids tin.
• QCX / QDX: Modern high-performance kits that you can build for under $50.

For engineers and tinkerers, there is a primal joy in communicating across oceans using a device you soldered together with your own hands.

4. A Language Beyond Language

One of the most beautiful aspects of Morse code is its ability to smash language barriers.

Ham radio has developed a universal set of “Q-codes” and abbreviations that allow two people who speak completely different languages to have a meaningful conversation.

• QTH = “My location is…”
• RST = “Your signal report is…”
• 73 = “Best regards”

A Japanese operator and a Brazilian operator can exchange names, locations, weather reports, and equipment details entirely in Morse code, without either speaking a word of the other’s native tongue. It is a truly global, neutral “lingua franca.”

5. The “Flow State”: Mindfulness and Mental Health

This might be the most surprising reason for CW’s longevity: It is good for your brain.

Learning Morse code is not about memorizing a chart; it’s about training your brain to hear a rhythm and instantly associate it with a letter. It is a form of auditory pattern recognition, very similar to learning a musical instrument.

Many operators describe a “Flow State” when operating CW at high speeds (20+ words per minute). You stop thinking about individual dots and dashes and start hearing whole words and phrases.

• Brain Training: Studies suggest that learning complex auditory skills can help maintain neuroplasticity as we age.
• Stress Relief: The intense focus required to decode a weak signal forces you to block out the distractions of daily life. It is a form of meditation.

6. How to Get Started (It’s Easier Than You Think)

Decades ago, you had to pass a grueling code test to get your license. That barrier is gone. Now, people learn CW because they want to, not because they have to.

If you are ready to join the ranks of the “brass pounders,” here is the modern roadmap:

1. Throw Away the Chart: Do not memorize visual dots and dashes (A = • —). This is a trap! You must learn the sound. (A = di-dah).
2. Use the Koch Method: This method teaches you two letters at full speed, then adds one more only when you have mastered the previous ones.
3. Download the Right Tools:
   • Apps: Morse Mania (iOS/Android) or Iz2uuf (Android).
   • Websites: LCWO.net (Learn CW Online) – The gold standard for browser-based learning.
   • Software: Morse Runner – A contest simulator that feels like a video game.
4. Join a Club: The Long Island CW Club and CW Academy offer Zoom-based classes that have revolutionized how the code is taught.

Conclusion: The Code Lives On

Is Morse code relevant? If you judge relevance by mass adoption, perhaps not. But if you judge it by utility, reliability, efficiency, and the sheer joy it brings to its practitioners, then Morse code is more relevant than ever.

It stands as a testament to the idea that “newer” isn’t always “better.” Sometimes, the simplest solution—an on/off switch and a rhythmic mind—is the most powerful one.

So, turn on the radio, tune down to the bottom of the band, and listen. The music of the airwaves is waiting for you.

The post The Art of Morse Code (CW): Is it Still Relevant in the Digital Age? appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

If you’re into amateur radio and love to tinker, here’s something weirdly fun to experiment with: rpitx2 — a software-only RF transmitter for the Raspberry Pi.

No, it’s not a substitute for your HF rig. No, it’s not going to replace your IC-7300 or even your Baofeng. But if you’re looking for an experimental project that lets you transmit real RF signals using just a Raspberry Pi and a bit of wire, rpitx2 is surprisingly powerful — in a nerdy kind of way.

What Is rpitx2?

rpitx2 is the second generation of the original rpitx by F5OEO. It’s a general-purpose RF transmitter that works by abusing (intentionally!) the Raspberry Pi’s GPIO pin to generate radio signals between 5 kHz and 1500 MHz. That covers everything from VLF to UHF.

All you need is:

• A Raspberry Pi (several models supported, more on that below)
• A short wire connected to GPIO 4 (pin 7) as an antenna
• The rpitx2 software
• And a sense of curiosity, because this is very much a let’s-see-if-it-works kind of project

A Word of Warning

This is experimental software. It hasn’t been certified for compliance with RF transmission regulations. You are entirely responsible for how you use it. If you’re a licensed amateur operator, stay within legal bands and power limits. If you’re not licensed — don’t transmit at all. Just use it into a dummy load or observe via SDR.

Also, don’t expect miracles. This is not a high-quality transmitter. The Pi is doing all the work in software. There’s no filtering, no PA stage, no real impedance matching — just raw RF squeezed out of a pin that was never meant to do this.

It’s great for short-range testing and learning about modulation, not for talking to DXCC entities.

What Can You Actually Transmit?

rpitx2 comes with a bunch of built-in demos and modes:

• FM with RDS: Yes, you can set up a mini pirate radio station (don’t, unless legal) that sends out stereo FM with station text.
• SSB Voice: Transmit your voice using single-sideband — just keep it low power.
• SSTV (Slow Scan TV): Send an image over HF using Martin1 mode and receive it on QSSTV.
• FreeDV: Try your hand at digital voice communication over RF.
• Pocsag: Yep, you can simulate a pager transmission.
• Carrier, Chirp, Spectrum tests: Great for SDR visualization and modulation experiments.

There’s also a “replay” function — you can record a signal with an SDR and replay it via rpitx2, for fun or analysis.

Hardware Compatibility

Here’s a quick breakdown of which Pi models work:

Raspberry Pi	Status
Pi Zero	Works
Pi Zero W	Works
Pi 3B / 3B+	Works
Pi 4	Sometimes
Pi 400	Sometimes
Pi 5	Not yet

Some models, especially Pi 4 and 400, can be unstable. Pi 3A+ seems to work quite well. Also, remember: no filtering means your Pi is potentially throwing out a lot of unwanted signals (harmonics). Be a good neighbor. Use a low-pass filter, or better yet, a dummy load.

Range? Power? Don’t Expect Much

At best, the Pi can output around 50 mW, depending on the GPIO drive strength and settings. The signal is enough to get picked up across a room or even down the block with the right antenna — but it’s not going to break through noise floors or reach satellites.

It’s been reported that a ~79 cm wire can give you a few hundred meters of range on 95 MHz in ideal conditions, but that’s highly variable.

The real value here isn’t range or power — it’s the education. You’ll learn about modulation schemes, SDR waterfall displays, antenna resonance, and more, all for the cost of a Raspberry Pi and some wire.

Use Cases for Hams

So why would a licensed ham care about this?

• Modulation experiments: Visualize FM, AM, SSB, and digital modes.
• Test signal generation: Useful for SDR calibration or receiver alignment.
• Digital mode experiments: Try encoding and decoding FreeDV, SSTV, POCSAG, etc.
• Beacons: Set up a temporary WSPR/OPERA-style beacon on ISM bands.
• Educational demos: Perfect for club meetings, STEM events, or just showing friends how modulation works.

Final Thoughts

rpitx2 is not a serious transmitter — but it’s not supposed to be. Think of it more like a radio playground for hackers and hobbyists. You’ll learn a lot, break a few things, maybe even disturb your FM radio a little. Just be responsible and legal about it.

It’s a brilliant reminder that sometimes, the best tools for learning aren’t the most expensive — they’re the most hackable.

Visit and learn more at https://github.com/KubaPro010/rpitx2

The post Playing with RF: rpitx2 Turns Your Raspberry Pi into a Radio Transmitter appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

If you’ve ever wanted to explore the radio spectrum from anywhere in the world, OpenWebRX+ offers a modern and accessible way to do just that — right from your web browser.

Built on top of the original OpenWebRX project, OpenWebRX+ is a community-driven fork that adds powerful features and support for a broader range of use cases, including amateur radio, shortwave listening, digital mode decoding, and even aviation or maritime monitoring.

What is OpenWebRX+?

OpenWebRX+ is a web-based software-defined radio (SDR) receiver platform. It lets multiple users access and listen to live SDR streams through a simple, responsive web interface. No complicated setup is needed for the listener — just open your browser and tune in.

Whether you’re a licensed ham radio operator, a shortwave enthusiast, or just curious about what’s on the airwaves, OpenWebRX+ makes radio accessible and enjoyable.

Key Features

• Multi-user support with efficient bandwidth sharing
• Real-time waterfall display with fast refresh and zoom
• AM, FM, SSB, CW, and digital modes (e.g., FT8, DMR, D-STAR, POCSAG)
• TETRA decoder
• Automatic decoder modules for popular digital signals
• Web-based configuration interface
• Mobile-friendly design

Thanks to its modular architecture, OpenWebRX+ continues to grow and integrate new features that help hobbyists, educators, and researchers monitor and explore radio signals more effectively.

Great for:

• Amateur radio operators who want to set up a remote receiver
• Radio clubs looking to make their SDR available to the public
• Developers and researchers working with digital radio protocols
• Listeners who enjoy discovering international broadcasts or local emergency services (where legal)

Easy to Set Up

You can run OpenWebRX+ on various hardware, including:

• Raspberry Pi (for light to moderate use)
• Intel/AMD Linux servers
• SDRs like RTL-SDR, Airspy, HackRF, LimeSDR, and others

The project is open-source and available on GitHub at:
https://github.com/luarvique/openwebrx

Full installation instructions, support, and community discussions are actively maintained.

Join the Global Listening Network

There’s something magical about tuning into signals from halfway across the world. Whether you’re decoding digital messages, monitoring weather balloons, or just enjoying the hiss of static, OpenWebRX+ connects you to the heartbeat of the RF spectrum.

It’s time to put your SDR to good use.

The post Explore the Radio Spectrum with OpenWebRX+ appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Whether you’re setting up an APRS iGate, running digital modes, or experimenting with SDR, the Raspberry Pi is a fantastic platform for amateur radio. It’s small, efficient, and surprisingly powerful. But with so many OS choices out there, which one is best for your shack?

Here’s a comprehensive guide to the best operating systems and setups tailored for amateur radio enthusiasts using the Raspberry Pi.

1. Raspberry Pi OS – The Flexible Foundation

Best for: Custom setups and flexibility
Why choose it? This is the official OS supported by the Raspberry Pi Foundation and offers full compatibility with most ham radio applications.

With the base OS (either the full desktop or the Lite version), you can install exactly what you need. Perfect for hams who want full control.

Recommended ham packages:

sudo apt update
sudo apt install fldigi flrig wsjtx js8call direwolf xastir

You can also add chirp for radio programming, gnuradio for SDR, or gpsd for location services.

2. HamPi – All-in-One Ham Radio OS

Developed by: Dave Slotter, W3DJS
Best for: Plug-and-play ham shack
What makes it special? HamPi is a fully-loaded Raspberry Pi image designed just for amateur radio.

Included software:

• WSJT-X, FLDIGI, JS8Call, CQRLOG
• GNU Radio, Xastir, Direwolf
• A huge range of tools for HF, VHF, SDR, logging, and more

Download from: https://github.com/dslotter/HamPi

Tip: Best used on Raspberry Pi 4 with 2GB RAM or more.

3. Build-a-Pi – Script Your Shack (73Linux)

Created by: KM4ACK
Best for: DIY-friendly automation
What it does: Build-a-Pi is a script that transforms a fresh install of Raspberry Pi OS Lite into a complete ham radio toolkit.

Features:

• Custom installs for JS8Call, WSJT-X, Direwolf, FLDIGI, HamLib
• Great for headless or touchscreen operation
• Community-supported and frequently updated

More info: https://github.com/km4ack/73Linux

4. PiAPRS – APRS-Focused Builds

Best for: APRS digipeaters, iGates, and trackers
Suggested setup:

• Start with Raspberry Pi OS Lite
• Add direwolf, aprx, or YAAC
• Add gpsd for GPS integration
• Connect via USB soundcard or hardware TNC

Perfect for building your own APRS infrastructure or mobile station. Simple, reliable, and efficient.

More info: https://github.com/km4ack/Pi-APRS

5. SkyAware / PiAware – For ADS-B and Aircraft Tracking

Developed by: FlightAware
Best for: Monitoring aircraft with an RTL-SDR dongle
What it does: This turnkey OS lets you receive live ADS-B data and feed it to FlightAware or view it locally.

More info: flightaware.com/adsb/piaware

Plug in your SDR and antenna, and you’re tracking planes in no time.

6. DragonOS – For Hardcore SDR Users

Best for: SDR experimentation and development
What’s inside: GNU Radio, GQRX, SDRangel, and a full set of signal analysis tools.

Note: DragonOS is heavier and best suited for Raspberry Pi 4 or 5 with plenty of RAM.

More info: DragonOS on SourceForge

7. Minimal Setup for Bots and Headless Gateways

For projects like APRS bots, stick to a minimal OS like:

• Raspberry Pi OS Lite (64-bit)

Then install only what’s needed:

sudo apt install python3 gpsd direwolf ax25-tools

Manage your scripts with systemd or cron. This keeps your system lean and efficient.

Recommended Hardware

• Raspberry Pi Model: Pi 3B+ or Pi 4 (2GB+ RAM recommended)
• Storage: At least 16GB Class 10 microSD or USB SSD
• Extras: USB soundcard, GPS module, USB-Serial cable, or TNC interface (e.g. Signalink, Digirig)

Final Thoughts

There’s no “one size fits all” OS for amateur radio on Raspberry Pi. It depends on your use case:

• Want an APRS gateway? Go minimal with Direwolf on Raspberry Pi OS Lite.
• Prefer digital modes like FT8 or JS8? Try HamPi or Build-a-Pi.
• Into SDR or signal decoding? DragonOS has you covered.
• Want to feed ADS-B data to FlightAware? Use PiAware.

Whatever your setup, the Raspberry Pi continues to be a powerhouse for hams who love to tinker, operate, and innovate.

The post Best Operating Systems for Raspberry Pi in Amateur Radio Use appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

In the ever-evolving world of amateur radio, the transceiver is the heart of every shack. Whether you’re a seasoned DXer, a digital mode enthusiast, a SOTA hiker, or someone who just loves ragchewing on VHF, having the right features in your radio can make the difference between frustration and flawless communication.

Below, we’ll explore the most desired features in modern amateur radio transceivers — not just specs, but how they make a difference in real-life ham operations.

1. High Dynamic Range Receiver: Handle the Heat in Pileups

Imagine you’re chasing a rare DX station during a massive pileup. Stations from across the globe are pounding the airwaves. A high dynamic range (HDR) receiver helps you focus on that weak DX signal without getting overwhelmed by nearby strong stations.

• Real-Life Example: During a 40m contest, you try to pull in a weak S9 signal from South America while local stations are transmitting at 59+40. A rig like the Elecraft K4 or Yaesu FTDX101D can isolate that weaker station with crystal clarity, thanks to superb dynamic range and filtering.
• Who Needs This: Contesters, DXers, and anyone operating in crowded bands.

2. SDR & Panadapter Display: See the Bands Come Alive

Software Defined Radio (SDR) architecture with a panadapter lets you see what’s happening across the band. Waterfall displays show activity in real time — you can spot signals, identify pileups, or find quiet spots without scanning.

• Real-Life Example: On a Saturday morning, you’re sipping coffee and glancing at your IC-7300. The display shows a strong digital cluster on 14.074 MHz (FT8). Without even tuning, you’re already planning your QSO.
• Who Needs This: Digital ops, DX chasers, anyone who prefers a visual interface over traditional dials.

3. All-Band, All-Mode Coverage: From HF to Satellites

Radios with wide frequency coverage and multimode support are perfect for hams who enjoy variety.

• Real-Life Example: You’re operating portable during a camping trip. Your IC-705 or FT-991A lets you work 20m SSB in the morning, chase satellites on VHF in the afternoon, and experiment with digital modes in the evening — all from one compact radio.
• Who Needs This: Field operators, SOTA activators, satellite enthusiasts, and minimalist operators.

4. Digital Voice and Data Support (D-STAR, C4FM, DMR, FT8, etc.)

In today’s digital age, voice and data modes are no longer niche. Many radios now come equipped or are easily compatible with digital systems.

• Real-Life Example: Using Yaesu’s C4FM (System Fusion), you join a local repeater net with crystal-clear voice. Later, you switch to FT8 and fire up WSJT-X via the built-in USB sound card on your radio. No messy interfaces — just plug and play.
• Who Needs This: Hams who experiment with modes, join global DMR or D-STAR networks, or love FT8 simplicity.

5. Built-in GPS & APRS: Know Your Position, Track Your Path

APRS (Automatic Packet Reporting System) allows real-time tracking, messaging, and weather reporting. Radios with built-in GPS and TNCs simplify setup dramatically.

• Real-Life Example: You’re hiking in the highlands with a Kenwood TH-D74. APRS automatically transmits your position to aprs.fi every few minutes. If there’s an emergency, other operators can find you. You also see nearby stations and repeaters on the radio screen.
• Who Needs This: EmComm operators, hikers, mobile operators, APRS users.

6. Low Power (QRP) and Portable Operation: Operate Anywhere

For some, less is more. QRP (low-power) rigs are compact, efficient, and ideal for outdoor adventures.

• Real-Life Example: You’re on a SOTA summit with an Elecraft KX2 and a simple wire antenna. Using just 5 watts, you work stations across Europe and Asia — all while enjoying the view from a mountaintop.
• Who Needs This: Portable operators, backpackers, emergency communicators, stealth hams.

7. Remote Operation & Network Control: Ham Radio Without Borders

Remote control capability lets you operate your rig from anywhere — your office, a hotel, or even your smartphone.

• Real-Life Example: You’re traveling abroad but miss your home station. With a FlexRadio 6600 and SmartLink or an Icom IC-705 using RS-BA1 software, you operate your station over the internet. Tune, transmit, and log QSOs as if you were there.
• Who Needs This: Tech-savvy hams, frequent travelers, remote station builders.

8. Powerful DSP: Tame the Noise

Digital Signal Processing (DSP) enhances readability by cutting out unwanted noise, filtering QRM/QRN, and improving weak signals.

• Real-Life Example: You’re on 80m at night with static crashes and a noisy neighbor. With just a few menu taps, the noise reduction kicks in and transforms an unintelligible signal into a comfortable SSB conversation.
• Who Needs This: Every ham — especially those in urban or noisy environments.

9. Dual Receive and Diversity Reception

Dual receivers let you monitor two frequencies or bands simultaneously — incredibly useful for working split operations or monitoring two nets.

• Real-Life Example: You’re monitoring a DXpedition on 20m while keeping an ear on your local emergency net on 2m. Your Icom IC-9700 or Elecraft K4D handles both without blinking.
• Who Needs This: DXers, net control operators, multitaskers.

10. Voice Memory and CW Keyer

Voice and CW memory functions make contests, nets, and repetitive calling much easier.

• Real-Life Example: You’re running a contest and programmed your CQ call into memory. Hit a button, grab some coffee, and watch the pileup form while your radio calls CQ on loop.
• Who Needs This: Contesters, net controllers, and CW enthusiasts.

Final Thoughts: What Should You Aim For?

There’s no one-size-fits-all in amateur radio. A good transceiver is one that aligns with your interests — whether it’s:

• HF DXing? → Prioritize dynamic range, DSP, and SDR display.
• Digital modes? → Go for USB audio interface, CAT control, and good filtering.
• Portable/QRP? → Look for light weight, battery efficiency, and multiband coverage.
• Emergency comms or mobile? → Built-in GPS, APRS, and ruggedness matter most.

The dream shack might cost thousands, but many budget-friendly rigs pack serious features too. Know what you need, and build your setup with purpose.

Got a favorite feature or radio setup you rely on? Share it in the comments!

The post Top Features Every Amateur Radio Operator Wishes Their Transceiver Had — With Real-Life Use Cases appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

What Is ACARS Hub?

ACARS Hub is a Docker container designed to collect, parse, and visualize messages from a variety of aircraft communication systems. If you’ve ever used acarsdec, dumpvdl2, or dumphfdl, you’ll know that raw output can be technical and terse. ACARS Hub improves on this by enriching the decoded messages with data from the amazing team at Airframes.io, making messages easier to read and interpret.

It works across architectures—amd64, arm64, armv7, armv6, and even 386—making it perfect for devices like the Raspberry Pi.

What You’ll Need

To get started, you’ll need:

• A Linux system that can run Docker (a Raspberry Pi works great)
• One or more RTL-SDR dongles (at least one for ACARS, ideally a second for VDLM2)
• Docker and Docker Compose
• One or more SDR decoders (see below)

Decoding support includes:

• acarsdec (recommended: airframes fork)
• dumpvdl2 (preferred VDLM2 decoder)
• vdlm2dec
• dumphfdl
• satdump for Inmarsat
• gr-iridium toolkit for Iridium
• JAERO for L-band satellite decoding

All these decoders can run externally and push decoded JSON to ACARS Hub over UDP.

Ports and Connectivity

Here are the main ports you’ll deal with:

Using these, you can stream messages into the container and even pipe data out to other systems for further analysis or visualization.

Docker-Compose: The Fast Track Setup

Here’s a minimal working setup for your docker-compose.yaml:

services:
  acarshub:
    image: sdrenthusiasts/acarshub:latest
    ports:
      - 80:80
      - 5550:5550/udp
      - 5555:5555/udp
      - 5556:5556/udp
      - 5557:5557/udp
      - 5558:5558/udp
      - 15550:15550
      - 15555:15555
      - 15556:15556
      - 15557:15557
      - 15558:15558
    volumes:
      - acarshub_data:/run/acars
    environment:
      - ENABLE_WEB=true
      - ENABLE_ACARS=external
      - ENABLE_VDLM=external
      - DB_SAVEALL=false
volumes:
  acarshub_data:

This setup enables ACARS and VDLM2 processing, exposes the necessary ports, and stores data on a local volume.

Performance Tips

Running a database on something lightweight like a Raspberry Pi? You’ll want to:

• Mount /run/acars/ as a tmpfs to reduce SD card writes
• Set DB_SAVEALL=false to avoid storing uninformative messages
• Limit data retention by adjusting DB_SAVE_DAYS

Want better search speed? Temporarily enable AUTO_VACUUM=true to clean the database.

Enhancing Your Map with ADS-B Data

To display ADS-B targets on the ACARS Hub map:

1. Run tar1090 and readsb on the same host
2. Enable ADS-B in ACARS Hub with: - ENABLE_ADSB=true - ADSB_URL=http://tar1090/data/aircraft.json
3. Set your lat/lon for correct range rings

You’ll be able to click aircraft on the map and see related messages.

Make the Data Accurate for Your Region

Airline codes can be tricky. If you notice callsigns mapping incorrectly (e.g. UPS showing up as BahamasAir), you can fix them locally using the IATA_OVERRIDE environment variable. Example:

IATA_OVERRIDE=UP|UPS|United Parcel Service;US|AAL|American Airlines

Web Interface & Tricks

ACARS Hub has a responsive web UI on port 80. You can:

• Press p on the Live Messages page to pause auto-scroll
• Use the search page to filter messages by keyword or callsign
• Connect other tools or visualizers to exposed JSON ports like 15555 (VDLM2) or 15550 (ACARS)

Future Developments

The project’s active and rapidly evolving. Upcoming features include:

• A revamped UI
• Desktop apps
• Improved message matching between ACARS and ADS-B

Get Help or Contribute

ACARS Hub is open-source and community-driven. You can:

• Raise issues or contribute code on GitHub
• Join the Discord server for support and ideas

Whether you’re a seasoned SDR hobbyist or new to decoding, ACARS Hub makes it easier than ever to monitor real-world aircraft communication with real-time visualization and analysis.

Visit https://github.com/sdr-enthusiasts/docker-acarshub

The post A Look into ACARS Hub and How to Set It Up on Your SDR System appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

If you’re into amateur radio and love tinkering with Linux, you’ve probably heard of the Xiegu X6100—a portable HF transceiver that combines solid performance with an open, hackable platform. But what if you could take it further and run a full Armbian Linux system directly on it?

Thanks to the work by Links2004, it’s now possible.

Why Run Armbian on the X6100?

The X6100 runs on a Quad-Core Cortex-A7 SoC, originally intended for embedded systems and Android. Xiegu ships it with a custom Linux build, but it’s minimal, locked down, and missing common developer tools. For power users and developers, this is limiting.

By installing Armbian—a Debian-based lightweight Linux distro optimized for ARM devices—you can:

• Get full access to the system
• Use standard packages and development tools
• Enable remote access via SSH
• Customize the firmware environment

It essentially transforms your X6100 from just a radio into a mini portable Linux server.

What This Project Offers

The x6100-armbian project provides:

• A working Armbian image for the X6100’s internal eMMC or external SD card
• A ready-to-use u-boot bootloader configuration
• A tailored Linux kernel and device tree for X6100 hardware
• Instructions for flashing and booting Armbian
• Tools for creating your own image

The goal is to make your X6100 boot into Armbian like any SBC (think Raspberry Pi, but with a radio attached).

What Works (and What Doesn’t Yet)

According to the repo, here’s what works:

Serial console over USB
Ethernet over USB
WiFi
GPIO, I2C, SPI
Audio input/output
LCD panel
Battery status

This makes it possible to use the device for advanced scripting, monitoring, and even remote ham operations via the internet.

As with all bleeding-edge projects, some features may still need refinement—so treat this as experimental <– WARNING.

Getting Started

To try this out:

1. Clone the Repository
   Start by cloning the GitHub repo:
   git clone https://github.com/Links2004/x6100-armbian
2. Build or Download an Image
   You can either build the image from scratch using the Armbian build system, or download a prebuilt one (if available in the repo).
3. Flash to SD or eMMC
   Flash the image to an SD card using dd, Etcher, or your favorite tool. Boot it via the SD card first before flashing to internal storage.
4. Boot and Connect
   Connect to the serial console via USB or use the onboard Ethernet-over-USB to SSH in. You’ll be greeted with a full Armbian environment.

Use Cases

So what can you do once you’ve got Armbian running?

• Host a digital mode gateway (FT8, JS8Call, APRS)
• Develop custom X6100 tools using Python or C++
• Create a remote-controlled ham station over the web
• Run audio processing, logging software, or cloud sync scripts
• Harden and sandbox the radio for secure field deployment

The possibilities are only limited by your creativity—and your battery life!

Final Thoughts

Running Armbian on the X6100 breathes new life into an already impressive device. It opens up a playground for experimentation, automation, and integration, bridging the gap between the Linux SBC world and amateur radio.

Whether you’re a hacker, a maker, or a serious ham radio operator, this project is well worth a look. Just keep in mind: this is a community-driven effort, not an official Xiegu firmware, so proceed with care—and make backups! No warranty! This is not for normal users.

Credit:
All thanks and credit to Links2004 on GitHub for pioneering this project. You can view the full project and contribute at:
https://github.com/Links2004/x6100-armbian

The post Running Armbian on the Xiegu X6100 appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

If you’re running a Xiegu X6100 and find yourself itching to explore what lies beneath its firmware, you’re not alone. But cracking it open safely and consistently? That’s where x6100-fw-mangler by @j0ju shines.

This project makes customizing and experimenting with X6100 firmware reproducible, debuggable, and way less painful—whether you’re tweaking system internals, creating multiboot images, or just injecting some extra userland tools.

Why This Project Exists

Because modding your radio should be fun, not a guessing game.

The X6100 is a fantastic device for amateur radio operators—but modding it has traditionally been tricky. The x6100-fw-mangler was built to:

• Simplify custom firmware builds
• Enable modifications without risking a brick
• Make the process transparent, reversible, and Dockerized

It’s a tool not just for flashing, but for learning, poking, and understanding how the X6100 boots and behaves.

What It Does

• Generates bootable SD card or eMMC update images
• Applies modifications to firmware safely inside a container
• Adds Alpine Linux userland tools to enhance functionality
• Builds multiboot setups (Xiegu stock + R1CBU open firmware)
• Supports original and open-source firmware (R1CBU)

You’ll be able to fully customize the system image and boot your X6100 from SD or flash it to internal storage.

Key Features

• Docker-powered, no need to pollute your host with toolchains.
• Uses qemu-user-static to emulate ARM and modify firmware even on x86.
• Custom SD card images with:
  • Alpine utilities
  • Bluetooth pairing scripts
  • Shell and serial tweaks
  • Automount disabled
  • GUI recoloring (cyan instead of red)

Supported Image Types

Hold the left-most button during boot to switch to the R1CBU firmware.

Example Commands

make xiegu-v1.1.7-modded.sdcard.img
make r1cbu-v0.17.1-modded.update.img
make multiboot-modded.sdcard.img

Need to unpack a random unknown .img file?

cp my-image.img unknown-beauty.img
make unknown-beauty.tar

This gives you a .tar archive of the image content for analysis.

How It Works (Under the Hood)

1. A Docker image called x6100:img-mangler is built with required tools.
2. .url files download official firmware (stock or R1CBU).
3. Firmware images are unpacked into /target.
4. Mods are applied (via Docker layers).
5. New .sdcard.img or .update.img files are output.

Linux users with binfmt_misc can chroot into the ARM image using QEMU—no real device needed.

WiFi + Console Tips

To connect to WiFi from serial console:

nmcli device wifi connect YOUR_SSID password YOUR_PASS

If you’re having issues with WPA3:

nmcli conn down YOUR_SSID
nmcli conn edit YOUR_SSID << EOF
  set wifi-sec.key-mgmt wpa-psk
EOF
nmcli conn up YOUR_SSID

Frequency Extension (TX Unlock / MARS Mod)

Want to transmit outside official HAM bands? Be warned—it’s your responsibility.

In firmware 1.1.7, edit:

/etc/xgradio/xgradio.conf

and change to fullband-tx=enable

Then restart the radio. You now TX on all supported frequencies. But this might violate local laws and could damage the hardware’s filtering. Proceed wisely.

Boot Process Summary

• Device starts with BROM
• Checks SD card → eMMC for EGON signature
• Loads U-Boot, reads MBR, looks for uboot.scr
• uboot.scr boots the kernel
• Environment var devnum:
  • 0 = booted from SD
  • 1 = booted from eMMC

The official u-boot-sunxi-with-spl.bin is used for boot sectors.

Credits

This entire toolchain was created and maintained by @j0ju.
Massive respect for building a clean, reproducible, and open solution for the Xiegu X6100 firmware community.

GitHub: github.com/j0ju/x6100-fw-mangler

The post X6100 Firmware Mangler: The Way to Hack and Tinker Your Xiegu X6100 (MARS mod) appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

If you’ve ever used Wi-Fi, tuned into a radio station, made a phone call, or messed with walkie-talkies or ham radios, you’ve used part of the radio spectrum. It’s invisible, but absolutely everywhere — and in Malaysia, it’s controlled and managed pretty tightly.

Here’s a quick, no-BS guide to how radio spectrum is allocated in Malaysia, and why it matters to people like us.

Who’s in Charge?

In Malaysia, MCMC (Malaysian Communications and Multimedia Commission) — or SKMM in Malay — is the boss when it comes to spectrum. They handle everything: planning, licensing, enforcement, and monitoring.

They don’t just make this up — the system follows international rules set by the ITU (International Telecommunication Union), but adapted for Malaysian use.

How the Spectrum is Divided

The radio spectrum covers everything from super low frequencies (used by submarines) to crazy high ones (used for satellite and radar). But here’s how it’s actually used in Malaysia:

• Mobile networks (3G, 4G, 5G): Big telcos like Celcom, Maxis, and Digi get assigned specific chunks like 700MHz or 2600MHz.
• Broadcasting: FM radio, TV, etc. all have their own dedicated bands.
• Wi-Fi and Bluetooth: Usually in the 2.4 GHz or 5 GHz bands — these are “license-free” under what’s called Class Assignment.
• Amateur Radio (Ham Radio): Specific bands like 144 MHz (2 meter), 430 MHz (70cm), and 7 MHz (40 meter HF band).

Types of Assignments

1. Spectrum Assignment (SA)

This is for big players — telcos, broadcasters, or anyone who wants a nationwide frequency. It usually costs a lot.

2. Apparatus Assignment (AA)

If you’re setting up a local radio repeater, a maritime radio, or an amateur radio station, this is the one you apply for. It’s tied to your equipment and location.

3. Class Assignment

No need to apply — just follow the rules. This includes Wi-Fi, Bluetooth, and short-range gadgets like baby monitors or RFID.

What About Ham Radio?

If you’re into amateur radio, you’ll need a license and a callsign. MCMC handles the licensing, and you’ll be issued an Apparatus Assignment. You also have to pass an exam.

Some of the key bands for ham ops in Malaysia include:

• HF: 7.0–7.2 MHz, 14.0–14.35 MHz, etc.
• VHF: 144–148 MHz
• UHF: 430–440 MHz
• Microwave: 1.2 GHz, 2.4 GHz, 5.6 GHz — shared with Wi-Fi and LoRa users

Why You Should Care

Whether you’re a ham, a network nerd, a radio engineer, or just a curious guy messing around with SDR or LoRa, knowing which frequencies are legal — and how they’re managed — is important. Malaysia’s spectrum isn’t a free-for-all. Using the wrong frequency or causing interference can get you fined, raided, or both.

Final Word

The radio spectrum might seem invisible and boring, but it powers nearly everything wireless around you. In Malaysia, MCMC makes sure it’s used in a way that avoids interference and supports public and commercial needs. If you’re a user — whether a ham operator, telco engineer, or tech tinkerer — it’s worth understanding the basics of how it works here.

Want to check out the band plan or license types? Just visit mcmc.gov.my

Open Shared Document

The post How Radio Spectrum Works in Malaysia appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Enter the NAS — Network Attached Storage — a powerful and often overlooked tool for modern amateur radio operators. Whether you’re a casual hobbyist or a serious station manager, a NAS can simplify and secure your digital life in the shack.

Let’s explore how NAS systems can benefit amateur radio operators, practical use cases, and some guidance to help you set one up.

What is a NAS?

A NAS is a dedicated device or server connected to your local network that stores data and provides services like file sharing, media streaming, backups, and more. Think of it as your personal cloud, available on your LAN (and remotely if you allow it).

Open-source NAS systems like TrueNAS, OpenMediaVault, Rockstor, and XigmaNAS make it easy and affordable for hams to build one using spare hardware or a Raspberry Pi.

Why Hams Should Consider a NAS

Here are several ways a NAS can become a central part of your shack:

1. Logbook and Data Backup

Store all your digital logbooks (e.g., N1MM, CQRLOG, Ham Radio Deluxe, Fldigi) in one place and access them from multiple devices.

• Automatically back up logs from your Raspberry Pi or Windows machine.
• Share your logbook with your contesting team on the same LAN.
• Keep a version history in case of accidental deletion.

2. SDR Recordings & Waterfalls Archive

Running SDR receivers like SDRplay, HackRF, or RTL-SDR? Those I/Q recordings and spectrogram images can take up a lot of space. A NAS lets you:

• Store massive SDR data files securely.
• Host them for playback or offline analysis.
• Use ZFS/Btrfs snapshots to prevent data corruption.

3. Web Server for Shack Tools

Host useful ham tools like:

• Local callsign lookup database
• DX cluster web interface
• OpenWebRX or KiwiSDR server
• Static wiki/documentation for station SOPs

A NAS with Docker support can run these tools as services—without tying up your main shack PC.

4. Shared Resources and Scripts

Many hams use scripting (Bash, Python, Node-RED) for automating things like antenna switching, remote rig control, or APRS messaging. Store all your scripts and station configs in one place.

Bonus:

• Sync with Git for version control.
• Share with your team during field day or emergency comms ops.

5. APRS and Meshtastic Gateway Backups

Running APRS I-Gates, Meshtastic bridges, or Direwolf/KISS TNC setups? Store:

• Config files (JSON, ini, conf)
• Logs of packet traffic
• Diagnostic captures (tcpdump, AX.25 monitoring)

Keep everything ready for instant restore if your SBC or microSD card fails.

6. SSTV and Digital Mode Archiving

Store and organize:

• SSTV images
• JS8Call messages
• FT8/FT4 decoded logs
• Signal reports and waterfall screenshots

Add tags or naming conventions for contests, satellite passes, or unusual propagation events.

7. Emergency Communications (EmComm)

Prepare for EmComm deployments by:

• Preloading maps, ICS forms, and software installers.
• Hosting offline resources (e.g., Wikipedia snapshot, repeater directory).
• Synchronizing field logs to your home NAS when the network comes online.

Choosing the Right NAS Setup

Pro tip: Use a UPS (Uninterruptible Power Supply) with your NAS to avoid data corruption during power outages—especially during storms or field deployments.

Real-World Ham Use: Example Scenario

Imagine this:

• You’re operating remote HF from your home, using a Raspberry Pi to control a rig via Hamlib.
• The Pi is running WSJT-X for FT8.
• Logs are automatically pushed to your NAS.
• You’ve configured your NAS to back up these logs to a cloud provider weekly.
• You also run Node-RED dashboards on the NAS to monitor temperature, power, and SWR sensors remotely.

This setup gives you flexibility, reliability, and peace of mind—all using open-source tools and amateur radio creativity.

Getting Started

1. Reuse an old PC or get a Raspberry Pi 4 with a USB drive.
2. Choose your NAS OS (TrueNAS, OpenMediaVault, etc.).
3. Connect it to your local network via Ethernet.
4. Enable services like SMB/NFS, Docker, and snapshots.
5. Start saving, sharing, and serving your ham shack data like a pro.

Final Thoughts

In 2025, the amateur radio shack is no longer just radios and antennas—it’s also data, software, and services. By adding a NAS to your setup, you gain control, resilience, and smarter station management.

Whether you’re a contester, experimenter, satellite operator, or EmComm volunteer, a NAS is an investment that pays off in convenience, security, and scalability.

Stay curious, stay connected, and happy experimenting!

The post How Amateur Radio Operators Can Use a NAS in the Shack: A Practical Guide appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

This guide breaks down the best ham radio apps for both iOS and Android platforms, based on real-world testing, SOTA/POTA field use, and everyday ham shack integration.

Why Use a Tablet for Ham Radio?

Before we dive into apps, let’s answer the question: Why a tablet?

• Portability: Tablets are lighter than laptops, with long battery life.
• Built-in GPS: Useful for APRS, logging, and repeater searches.
• Battery Efficient: Tablets sip power—ideal for solar/battery field use.
• Wi-Fi/4G/LTE Ready: Seamless connectivity for cloud-based logs, spotting, rig control, and alerts.

Category 1: Logging & Field Operations

HAMRS

Platform: iPad, Android, Windows, macOS, Linux
Best for: SOTA, POTA, Field Day, quick logging
Features:

• Offline database of parks and summits
• Automatically tags your location (GPS)
• Export logs as ADIF
• Simple, responsive UI

Why it stands out: It was built specifically for operators in the field. You can set up your logging template for POTA, SOTA, WWFF, or any special event station.

HamLog by Pignology

Platform: iOS (iPad & iPhone)
Best for: General-purpose logging, DX cluster, rig control
Features:

• Logging with ADIF export
• Callsign lookup with QRZ.com
• DX cluster
• Rig control with Pignology devices (and some Wi-Fi-enabled radios)

Best iPad all-in-one logging solution. Sadly, no Android version yet.

Category 2: APRS Tracking & Messaging

APRSdroid

Platform: Android
Best for: Real-time APRS beaconing, messaging, IGate
Features:

• Send/receive APRS messages
• Track position via GPS
• Supports KISS TNC (Bluetooth, USB-Serial, TCP/IP)
• Can work as a mobile IGate

Power tip: Pair with a Bluetooth KISS TNC like Mobilinkd or DIY build on a Baofeng for cheap mobile APRS.

APRS.fi (iOS app)

Platform: iPad
Best for: APRS map and station tracking
Features:

• APRS map with callsign search
• Beacon details, telemetry, weather
• Works well in mobile browser

Category 3: Digital Modes & Rig Control

SDR-Control / SmartSDR for iPad

Platform: iPad
Best for: Remote operation of FlexRadio or Icom SDRs
Features:

• CW, SSB, FT8, RTTY, PSK built-in
• Full waterfall/spectrum display
• CAT & PTT over Wi-Fi
• Logging, alerts, DX cluster

Powerful enough to replace a laptop for digital ops. Expensive, but worth every cent if you have a compatible radio like IC-705 or Flex 6400.

Wfview

Platform: Android (also Linux/Windows/macOS)
Best for: Icom remote rig control
Features:

• Connect to IC-705, IC-7300, IC-9700, etc.
• Remote audio, waterfall display
• Cross-platform support

Ideal if you want full rig control from an Android tablet in your shack or over LAN/Internet.

Category 4: Propagation & DX Spotting

HF Propagation

Platform: Android
Best for: Checking band conditions
Features:

• Solar flux, A/K index, sunspots
• MUF predictions
• DX beacons map

Useful for planning DX sessions or evaluating band conditions before you fire up the rig.

DX Cluster Apps (iCluster / DX Monitor)

• iCluster (iPad) and DX Cluster Pro (Android) let you monitor real-time DX spots, filter by band/mode/entity, and alert you when your desired DX pops up.

Category 5: Repeater and Call Sign Lookup

RepeaterBook

Platform: iOS & Android
Best for: Repeater finder with GPS support
Features:

• Auto location-based search
• Mode filters (FM, DMR, YSF, D-STAR)
• Offline database support

Essential for traveling hams or road-trippers.

QRZ Tools / Callsign Lookup

Platform: Web, mobile apps
Best for: Checking callsign info on the fly
Tip: Add QRZ.com as a home screen shortcut on your tablet for instant access.

Bonus Apps for Ham Utility

Zello

Platform: iOS & Android
Best for: PoC (Push-to-Talk) comms with other hams over LTE
Use cases:

• Backup comms during events
• Informal nets over PoC devices
• Connect to ham gateways

Pairs well with TIDRADIO G100 or Android PoC radios.

EchoLink

Platform: iOS & Android
Best for: Internet-based voice comms via repeaters
Great for: Reaching home repeaters when you’re abroad or stuck without RF.

Real-World Use Case: Tablet-Only Field Day Setup

Imagine this:

• Tablet: iPad or Android
• Radio: Icom IC-705 (or FT-817 with TNC)
• APRS: APRSdroid + Bluetooth TNC
• Logging: HAMRS
• Digital Modes: FT8 via SDR-Control (iPad) or Wfview (Android)
• Maps/Repeater Info: RepeaterBook + offline maps
• Comms backup: Zello

You’ve now got a full portable station in a backpack, no laptop required. Perfect for SOTA, POTA, or emergency response.

Final Thoughts

There is no single best app—but the best combination of tools that fits your radio gear, operating style, and device platform.

iPad users have powerful SDR-centric apps with premium performance (e.g. SDR-Control), while Android users benefit from flexibility, open-source tools, and more APRS integration (like APRSdroid and Wfview).

Whether you’re logging QSO from a summit or remote-controlling your rig from a hammock, tablets are now a serious part of the modern ham radio toolkit.

The post Best Apps for Amateur Radio Operations on iPad and Android Tablets appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Let’s explore the technologies that are transforming DXpeditions today, and take a peek at some exciting new possibilities on the horizon.

What Makes Modern DXpeditions So Successful?

1. Remote Control – Operating from Anywhere

What it is: You can now control your radio station from anywhere in the world using the internet.

How it works:

• Special devices connect your radio to the internet
• Software on your computer lets you operate as if you’re sitting at the radio
• You can change frequencies, adjust power, and even rotate antennas remotely

Popular tools:

• RemoteRig RRC-1258: The most trusted system for remote radio control
• Elecraft K3/K4 series: Radios with built-in remote control features
• FlexRadio 6000 series: Software-defined radios perfect for remote operation
• Ham Radio Deluxe: Complete software suite for computer control

Why it matters: Operators can take breaks, work in shifts, or even operate from a safe location during bad weather.

2. Digital Modes – Making Contacts in Tough Conditions

What they are: Special computer modes that work much better than voice in poor conditions.

The game-changing software:

• WSJT-X: The main program for FT8, FT4, and other weak signal modes
• JS8Call: Allows real-time text conversations using weak signal technology
• fldigi: Handles dozens of digital modes in one program

Popular logging software:

• N1MM Logger+: The gold standard for contest and DXpedition logging
• Ham Radio Deluxe Logbook: Integrates with radio control
• Logger32: Free, powerful logging with extensive features

The benefits:

• Make contacts when voice won’t work
• Automatic logging saves time
• Can work during solar storms when other modes fail

3. Better Batteries and Solar Power

Specific products making a difference:

Battery Technology:

• Battle Born LiFePO4 batteries: 100Ah batteries with 10+ year lifespan
• Victron Energy systems: Smart battery monitors and solar controllers
• Goal Zero power stations: All-in-one portable power solutions

Solar Solutions:

• Renogy flexible solar panels: Lightweight panels for portable use
• AIMS Power inverters: Convert 12V to 120V efficiently
• Victron SmartSolar MPPT controllers: Maximize solar charging with phone app control

Why this matters: You can operate for days without any outside power source.

4. Lightweight, Portable Antennas

Breakthrough antenna products:

Portable Beam Antennas:

• SteppIR BigIR Vertical: Remotely tunable from 6-80 meters
• Hex Beam by K4KIO: Lightweight 6-band beam antenna
• Buddipole antenna system: Modular design for any band/situation

Wire Antennas:

• Par Electronics EFHW antennas: End-fed half-wave antennas with built-in tuners
• Chameleon Antenna CHA MPAS: Portable military-style antenna system
• LNR Precision EFT Trail antennas: Ultra-lightweight for backpacking

Automatic Tuners:

• Elecraft T1 tuner: Tiny tuner for QRP operations
• LDG Electronics AT-600ProII: High-power tuner for serious DXpeditions
• Icom AH-4 automatic screwdriver antenna: Vehicle-mounted auto-tuning antenna

The advantage: Get great performance without needing a big tower or lots of space.

5. Internet Tools for Better Operations

What’s available:

• Real-time band condition reports
• Automatic spotting when you’re on the air
• Online logbooks that sync everywhere
• Propagation predictions

How it helps: Know exactly when and where to operate for best results.

6. Starlink: The Game-Changer for Remote Internet

What it is: SpaceX’s satellite internet constellation that provides high-speed internet almost anywhere on Earth.

Why it’s revolutionary for DXpeditions:

• Works in locations with zero cellular coverage
• Fast enough for remote control operations
• Enables real-time logging and spotting from anywhere
• Makes VoIP communication possible from remote sites

Real-world impact:

• Recent DXpeditions to remote islands now have better internet than many cities
• Teams can stream live video from their operations
• Immediate log uploads and QSL processing
• Emergency communication backup

Equipment needed:

• Starlink dish and modem (about $600)
• Monthly service (around $110-150)
• Portable power system for 24/7 operation

7. Communication and Safety Equipment

Satellite Communication:

• Garmin inReach Mini: Two-way satellite messaging and SOS
• Iridium Satellite Phone: Voice calls from anywhere on Earth
• SPOT X: Two-way satellite messenger with smartphone connectivity

APRS and Tracking:

• Kenwood TH-D74: Handheld radio with built-in APRS and GPS
• Yaesu FTM-400: Mobile radio with APRS and digital modes
• Argent Data T3-135: Tiny APRS tracker for position reporting

8. Specialized DXpedition Equipment

Contest/DX Software:

• DX4WIN: Complete logging and spotting system
• WriteLog: Multi-operator contest logging
• Win-Test: Real-time multi-station networking

Test Equipment:

• RigExpert AA-600: Antenna analyzer covering HF through UHF
• NanoVNA: Affordable vector network analyzer
• MFJ-269Pro: Classic antenna analyzer with graphical display

The New Kids on the Block: VR and AR

What Are VR and AR?

Virtual Reality (VR): Put on special goggles and you’re transported to a completely digital world.

Augmented Reality (AR): Look through special glasses or your phone, and digital information appears overlaid on the real world.

How Could These Help DXpeditions?

Virtual Reality Uses:

• Virtual site visits: “Visit” a DXpedition location before going there
• Training: Practice operating in a safe, simulated environment
• Remote participation: Let supporters “join” your DXpedition virtually
• Planning meetings: Team members worldwide can meet in virtual space

Augmented Reality Uses:

• Antenna tuning help: See SWR readings floating in your field of view
• Assembly instructions: Get step-by-step guidance overlaid on real equipment
• Band condition display: See propagation data while you operate
• Remote expert help: Let an expert “see through your eyes” to help troubleshoot

The Reality Check: Current Limitations

Why VR and AR aren’t everywhere yet:

1. Equipment issues:
   • Heavy and bulky
   • Batteries don’t last long
   • Expensive
   • Not built for outdoor use
2. Internet problems:
   • Need very fast internet connections
   • Most DXpedition sites have poor internet
   • Can be unreliable when you need it most
3. Practical concerns:
   • VR can be distracting during real contacts
   • Limited software designed for ham radio
   • Steep learning curve
4. Cost vs. benefit:
   • Current ham radio tools work very well
   • Hard to justify the expense for small improvements

Real Examples of VR/AR in Ham Radio

What’s happening now:

• Virtual hamfests during COVID-19 were very successful
• Some clubs hold meetings in VR spaces
• Mobile apps show basic AR overlays for frequency information
• Universities use VR to teach antenna theory

Small experiments:

• DXpedition teams testing AR for equipment troubleshooting
• Contest stations trying heads-up displays for band information
• Emergency groups exploring VR for training scenarios

What Does the Future Look Like?

Next 2-3 Years: Testing and Learning

• Lightweight AR glasses become available
• Better software designed specifically for ham radio
• Major DXpeditions start small experiments
• Costs come down significantly

5 Years from Now: Early Adoption

• Rugged equipment suitable for field use
• Reliable software with proven benefits
• Standard training programs available
• Integration with existing station equipment

10 Years Out: Mainstream Use

• Most major DXpeditions include VR/AR equipment
• Automatic antenna optimization using AR
• Virtual participation becomes common
• AI assistants help with station operation

Should You Care About This Now?

For Most Hams: Not Yet

The current proven technologies (remote control, digital modes, modern batteries) offer much better value for your money right now.

For Early Adopters: Start Small

• Try VR hamfest experiences
• Experiment with AR apps on your phone
• Follow developments in ruggedized equipment
• Consider learning VR/AR development skills

For DXpedition Planners: Stay Informed

• Monitor technology developments
• Budget for future upgrades
• Consider partnership opportunities with tech companies
• Plan for eventual integration

The Bottom Line

DXpeditions today benefit from incredible proven technologies that make operations more successful than ever before. Remote control, digital modes, advanced power systems, and internet tools are game-changers that work reliably in the field.

VR and AR represent exciting possibilities for the future, but they’re still experimental for our hobby. The hardware needs to get lighter, cheaper, and more rugged. The software needs to be designed specifically for amateur radio. And we need better internet connectivity in remote locations.

The smart approach: Master today’s proven technologies while keeping an eye on emerging ones. The future of DXpeditioning will likely blend the best of both worlds.

Remember: Technology serves our goals of making contacts and sharing our hobby. The latest gadget isn’t always the best tool for the job.

The future of DXpeditioning is being written now. Whether you prefer traditional methods or cutting-edge technology, there’s never been a more exciting time to be involved in amateur radio adventures.

What technologies have you tried in your portable operations? What would you like to see developed next? Share your thoughts and experiences – the amateur radio community learns best when we share knowledge with each other.

The post How Modern Technology is Changing Amateur Radio DXpeditions appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Why Docker?

Docker allows you to deploy software in isolated containers, complete with all their dependencies. This means you don’t need to worry about library conflicts, system packages, or compiling from source—just pull the image and run.

The Docker images provided by jketterl on Docker Hub are built specifically for OpenWebRX and include all necessary requirements out of the box. Images are available for a range of hardware types, and there’s even a comprehensive “full” variant that supports multiple SDR devices.

These images are built for multiple architectures:

• x86_64 (most desktops/laptops)
• armv7l and aarch64 (perfect for Raspberry Pi and similar single-board computers)

Quick Start for Raspberry Pi

If you haven’t installed Docker yet, the easiest way is to run:

curl -sSL https://get.docker.com | sh

Once Docker is installed, you’re just two commands away from getting OpenWebRX up and running:

docker volume create openwebrx-settings
docker run --device /dev/bus/usb -p 8073:8073 \
  -v openwebrx-settings:/var/lib/openwebrx \
  --tmpfs=/tmp/openwebrx \
  jketterl/openwebrx:stable

This setup does the following:

• Maps USB access so your SDR hardware can be used inside the container
• Creates a persistent volume for OpenWebRX settings
• Offloads temporary files to memory (tmpfs) to reduce SD card wear, which is especially important on Raspberry Pi

Docker Compose Option

If you prefer docker-compose, here’s a minimal docker-compose.yml setup:

version: "3"
services:
  openwebrx:
    image: jketterl/openwebrx:stable
    volumes:
      - ./openwebrx/settings:/var/lib/openwebrx
    ports:
      - "8073:8073"
    devices:
      - "/dev/bus/usb/002/002:/dev/bus/usb/002/002"
    tmpfs:
      - "/tmp/openwebrx"

Make sure to adjust the USB device path according to your system. You can check your SDR device’s path using lsusb and ls /dev/bus/usb.

Troubleshooting: USB Device Access

Some users run into issues when the SDR device cannot be accessed inside the Docker container. This usually shows up as an error like:

usb_claim_interface error -6

This happens when the Linux kernel loads its own drivers for your SDR, preventing access from within Docker.

To solve this, you’ll need to blacklist the appropriate kernel modules on your host system. Here’s a quick reference:

On Debian-based systems:

Create a file in /etc/modprobe.d/, such as sdr-blacklist.conf, and add lines like:

blacklist dvb_usb_rtl28xxu

After that, run sudo update-initramfs -u and reboot your system to apply the changes.

Final Notes

This containerized approach to running OpenWebRX is efficient, maintainable, and easy to back up or migrate. It’s ideal for both newcomers and experienced users alike. The Docker images by jketterl are actively maintained and support a variety of SDR hardware, making them a solid choice for any SDR setup.

If you’re looking to get your SDR receiver online with minimal configuration and maximum flexibility, this is the way to go. Visit https://github.com/jketterl/openwebrx

The post OpenWebRX Using Docker on Raspberry Pi and Other Devices appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Debian continues to be a powerful and versatile platform for amateur radio enthusiasts. One of its most valuable features is the Hamradio Blend, which includes a series of metapackages tailored specifically for amateur radio operations. These metapackages make it incredibly convenient to install and manage a full suite of ham radio tools and software in just a few commands.

What Are Metapackages?

Metapackages are essentially collections of related software grouped under a single package name. Installing one metapackage will automatically pull in all the recommended packages associated with a particular task. For ham radio operators, this means less time hunting for individual software packages and more time focusing on radio activities.

Available Hamradio Metapackages

Here’s a breakdown of the currently maintained metapackages in the Debian Hamradio Blend:

Installing Metapackages

To install any of these task-based collections, simply use the following format with your preferred package manager:

sudo apt-get install hamradio-<task>

Replace <task> with the specific area you’re interested in, for example:

sudo apt-get install hamradio-logging

If you’re looking for a full-featured ham radio setup, you can install the entire blend in one go:

sudo apt-get install hamradio-antenna hamradio-datamodes hamradio-digitalvoice hamradio-logging hamradio-morse hamradio-nonamateur hamradio-packetmodes hamradio-rigcontrol hamradio-satellite hamradio-sdr hamradio-tools hamradio-training

Final Thoughts

Whether you’re into CW, APRS, satellite work, or just learning the ropes, the Debian Hamradio Blend has something to offer. With metapackages, setting up a complete amateur radio environment has never been easier. This is a great way to turn your Debian machine into a powerful radio shack workstation.

If you’re running Debian, give these metapackages a try and take your ham radio experience to the next level.

Visit https://www.debian.org/blends/hamradio/get/metapackages

The post Boost Your Ham Radio Experience on Debian with the Hamradio Metapackages appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

If you’re curious about what’s happening in the skies above you, listening to airband communications can be both educational and fascinating. With a cheap RTL-SDR dongle and FreeBSD, you can tune into ATC (Air Traffic Control) and pilot conversations live.

In this guide, we will walk you through setting up OpenWebRX on a FreeBSD system, using an RTL-SDR USB dongle

What You’ll Need

• A FreeBSD 13.x or 14.x system
• RTL-SDR dongle (with RTL2832U chipset)
• Airband antenna (or any VHF-capable antenna)
• Internet access (for installing packages)
• Basic CLI skills

Step 1: Install Required Packages

Install essential packages for RTL-SDR, Python, and audio support:

pkg install rtl-sdr git python3 py39-pip ffmpeg sox cmake gmake libusb

Step 2: Plug in the RTL-SDR and Test It

Insert the dongle into a USB port and run:

rtl_test

You should see something like:

Found 1 device(s):
  0: Realtek, RTL2838UHIDIR, SN: 00000001
...

If you see USB permission errors, add yourself to the operator group:

pw groupmod operator -m yourusername

Then log out and back in.

Enable the cuse kernel module:

kldload cuse
echo 'cuse_load="YES"' >> /boot/loader.conf

Step 3: Get OpenWebRX

Clone OpenWebRX from GitHub:

git clone https://github.com/simonyiszk/openwebrx.git
cd openwebrx

Install Python dependencies:

pip install -r requirements.txt

Step 4: Configure OpenWebRX for Airband

Copy the sample config:

cp openwebrx.cfg.sample openwebrx.cfg

Open the config file:

ee openwebrx.cfg

Adjust it for airband listening:

receiver = {
    "device": "rtl_sdr",
    "center_freq": 125000000,      # Center frequency: 125 MHz
    "sample_rate": 2400000,
    "gain": "auto",
    "ppm": 0,
}

Airband frequencies are from 118.000 MHz to 136.975 MHz, using AM mode. You can tune to any frequency within that range from the OpenWebRX web interface once it’s running.

Optionally, set your receiver location and name for reference:

location = {
    "lat": 3.1390,
    "lon": 101.6869,
    "name": "Kuala Lumpur",
}

Step 5: Start Listening

Launch OpenWebRX:

./openwebrx.py

Open your browser and go to:

http://localhost:8073

You’ll see a real-time spectrum waterfall and can start tuning across the airband using the interface.

To listen to Kuala Lumpur International Airport (WMKK), try around 119.45 MHz, 121.70 MHz, or 124.00 MHz for Tower, Ground, or Approach frequencies (depending on your location and reception quality).

Optional: Allow Access Over Network

If using PF (Packet Filter), open TCP port 8073:

pass in proto tcp from any to any port 8073

Reload PF rules:

pfctl -f /etc/pf.conf

Now you (or friends) can access it via http://yourip:8073.

Tips for Better Reception

• Use an antenna tuned for VHF (118–137 MHz). Discone or airband-specific whip antennas work well.
• Mount your antenna as high and unobstructed as possible.
• Adjust gain in config (gain: 40 or gain: "auto").
• Tune PPM if needed (based on rtl_test output) for better accuracy.

Why This Is Awesome

• You can monitor air traffic around KLIA or Subang Airport live.
• Educational for student pilots, spotters, and aviation fans.
• Works great with low-cost hardware and FreeBSD’s performance.

Final Thoughts

With just an RTL-SDR dongle and FreeBSD, you can enjoy real-time airband monitoring using OpenWebRX. This setup gives you a browser-based interface to scan, visualize, and decode live air traffic—right from your desk, anywhere in the world.

The post Listen to Air Traffic on FreeBSD Using RTL-SDR and OpenWebRX appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

In the world of amateur radio, we often become captivated by the latest transceivers, cutting-edge antenna designs, and sophisticated digital modes. While these technological marvels rightfully deserve our attention, there’s a humble yet indispensable tool that many operators overlook: the compass. This simple navigational instrument has been guiding explorers, soldiers, and adventurers for centuries, and it remains just as relevant for today’s amateur radio operator.

Whether you’re a casual weekend warrior setting up for a Parks on the Air activation, a dedicated DXer optimizing your beam antenna, or an emergency communicator preparing for disaster response, a quality compass can be the difference between successful communication and frustrating silence. In this comprehensive guide, we’ll explore everything you need to know about compasses in amateur radio, from basic principles to advanced applications.

Understanding How Compasses Work: The Science Behind the Magic

The Fundamentals of Magnetic Navigation

At its core, a traditional compass operates on one of nature’s most fundamental forces: magnetism. The Earth itself acts as a giant magnet, with magnetic field lines flowing from the magnetic south pole to the magnetic north pole. The magnetized needle in your compass aligns itself with these invisible field lines, creating a reliable reference point that has guided humanity for over a thousand years.

However, there’s an important distinction that every amateur radio operator should understand: magnetic north is not the same as true north. True north points to the geographic North Pole, while magnetic north points to the magnetic north pole, which is currently located in northern Canada and moves approximately 25 miles per year. This difference, called magnetic declination or variation, varies depending on your location and can range from 0° to over 20° in some areas.

Types of Compasses and Their Applications

Modern compasses come in several distinct varieties, each optimized for specific use cases:

Magnetic Compasses (Traditional Analog) These are the classic liquid-filled compasses with a floating needle. They’re simple, reliable, and require no power source. The liquid dampening prevents excessive needle oscillation and provides smooth, stable readings even in windy conditions.

Lensatic Compasses (Military-Style Precision) Originally developed for military use, these compasses feature a hinged cover with a sighting wire and a lens for precise bearing measurements. They’re built to withstand extreme conditions and often include tritium illumination for night use.

Baseplate Compasses (Orienteering Style) Popular among hikers and orienteers, these compasses are mounted on a clear plastic baseplate with rulers and scales. They’re designed for map work and route planning, making them excellent for antenna site surveys and field operations.

Digital Compasses and Electronic Solutions Modern smartphones, GPS units, and dedicated electronic compasses use magnetometers and sometimes gyroscopes to determine direction. While convenient, they require power and can be affected by electronic interference from radio equipment.

Mirror Sighting Compasses These combine the accuracy of lensatic compasses with the map-work capabilities of baseplate compasses. The mirror allows for precise bearing shots while also serving as an emergency signaling device.

Why Every Amateur Radio Operator Needs a Compass

1. Directional Antenna Optimization: Getting Every dB

For amateur radio operators using directional antennas, precise alignment isn’t just helpful—it’s absolutely critical. Whether you’re operating a simple 2-meter Yagi or a massive HF beam array, pointing your antenna in the right direction can mean the difference between successful communication and complete failure.

Consider this scenario: you’re trying to work a rare DX station in Japan from your location in the eastern United States. Your beam antenna has a 3dB beamwidth of about 60°, which might seem forgiving, but being off by just 10-15° could cost you 1-2 dB of signal strength. In weak signal conditions, this seemingly small error could make your signal unreadable at the receiving end.

Professional antenna installations often require pointing accuracy within 1-2°, and while amateur installations might not need to be quite that precise, even casual operators can benefit from improved accuracy. A good compass allows you to:

• Accurately determine the bearing to your target location
• Properly align rotatable beam antennas
• Optimize fixed antenna installations during the planning phase
• Troubleshoot propagation issues by verifying antenna pointing

2. Portable and Emergency Operations: Navigation in the Field

Amateur radio’s strength lies partly in its portability and usefulness during emergencies. When you’re operating away from your comfortable home station—whether for SOTA (Summits on the Air), POTA (Parks on the Air), Field Day, or emergency response—a compass becomes an essential tool for several reasons:

Site Selection and Setup When arriving at a new operating location, understanding the terrain’s orientation helps you make informed decisions about antenna placement. If you know that the nearest repeater or your target contact area lies to the northeast, you can position your antenna and operating position accordingly.

Navigation and Safety In remote locations, especially during SOTA activations on mountain peaks, weather can change rapidly and visibility can become severely limited. Your GPS might fail, or its battery might die. A compass provides a reliable backup navigation method that could literally save your life.

Coordination with Other Operators When working with multiple operators in the field, being able to communicate precise bearings helps coordinate activities. “The noise is coming from 135°” is much more useful than “the noise is coming from over there somewhere.”

3. Amateur Radio Direction Finding (ARDF): The Art of the Hunt

Amateur Radio Direction Finding, also known as “fox hunting” or “transmitter hunting,” is both a competitive sport and a practical skill. Participants use specialized equipment and techniques to locate hidden transmitters, and a compass is absolutely essential for this activity.

Competition Fox Hunting In ARDF competitions, participants must locate multiple hidden transmitters in a wooded area using only their radio equipment and navigation skills. Success requires the ability to take accurate bearings from multiple locations and triangulate the transmitter’s position. Even small bearing errors can lead you miles off course.

Practical RFI Hunting When tracking down interference sources in your neighborhood, the same principles apply. By taking bearings from multiple locations and plotting them on a map, you can narrow down the interference source’s location before beginning detailed investigation.

Search and Rescue Applications Emergency responders sometimes use ARDF techniques to locate emergency beacons or lost persons carrying radios. The ability to quickly and accurately determine bearing to a signal source can be crucial in life-or-death situations.

4. HF Propagation and DXing: Understanding the Path

For HF operators, especially those interested in DX (long-distance) communication, understanding signal paths and propagation is crucial. A compass helps you:

Great Circle Bearing Calculations The shortest path between two points on Earth’s surface follows a great circle route, which often differs significantly from what appears shortest on a flat map. Knowing the great circle bearing to your target helps optimize antenna pointing for maximum signal strength.

Propagation Prediction and Analysis Understanding where your signal is going helps interpret propagation predictions and band conditions. If propagation to Europe is good but you’re hearing nothing on 20 meters, checking your antenna bearing might reveal that it’s pointed toward the Pacific instead.

Multi-Path Analysis Some HF signals can arrive via multiple propagation paths simultaneously. Understanding the geometry involved helps explain why signals sometimes sound distorted or have flutter.

Advanced Compass Applications in Amateur Radio

Magnetic Declination: The Critical Adjustment

One of the most important concepts for amateur radio operators to understand is magnetic declination. This is the angular difference between magnetic north (where your compass points) and true north (the actual direction to the North Pole). Declination varies significantly based on your location and changes slowly over time.

For example, if you’re operating from New York City, your magnetic declination is approximately 13° West, meaning your compass points 13° west of true north. If you’re trying to point your antenna toward Europe using a bearing calculated from true north, you’ll need to add 13° to that bearing when using your compass.

Most quality compasses include adjustable declination correction, allowing you to set the compass to show true bearings directly. This eliminates the need for mental math in the field and reduces the chance of errors.

Site Surveys and Antenna Planning

Before installing any significant antenna system, conducting a proper site survey is essential. A compass plays several important roles in this process:

Obstacle Analysis By taking bearings to various obstacles (trees, buildings, power lines), you can create accurate maps showing where antenna placement might be problematic. This is especially important when planning directional antennas that need clear paths in specific directions.

Ground Slope Analysis Many compasses include clinometers (inclinometers) that measure ground slope. This information is crucial when planning guy wires for towers or determining optimal locations for ground plane antennas.

Property Line Verification When installing antennas near property boundaries, accurate bearing measurements help ensure compliance with local setback requirements and maintain good neighbor relations.

Integration with Modern Technology

While traditional compasses remain valuable, they work best when integrated with modern technology:

GPS and Mapping Software Combining compass bearings with GPS coordinates allows for precise plotting on digital maps. Many mapping applications can display both magnetic and true bearings, making it easier to correlate compass readings with digital information.

Smartphone Apps While not replacements for dedicated compasses, smartphone compass apps can be useful for quick checks and preliminary planning. However, be aware that phones can be affected by magnetic interference from radio equipment.

APRS Integration For operators using APRS (Automatic Packet Reporting System), accurate position and bearing information can be crucial for effective communication and coordination with other stations.

Comprehensive Compass Recommendations for Amateur Radio

Choosing the right compass depends on your specific needs, operating style, and budget. Here are detailed recommendations across various categories:

Premium Professional Compasses

Suunto MC-2G Global Compass Price Range: $80-120

This is often considered the gold standard for serious outdoor professionals. The MC-2G features a global needle that works accurately anywhere on Earth, eliminating the need for different compasses in different geographic zones. Key features include:

• Adjustable declination correction with easy-to-use tool
• Mirror for precise bearing shots and emergency signaling
• Clinometer for measuring slope angles
• Luminous markings for low-light conditions
• Sapphire jewel bearing for long-term accuracy
• Temperature compensation for consistent readings

Best for: Serious SOTA/POTA operators, emergency communicators, and operators who travel internationally.

Brunton TruArc 20 Price Range: $70-100

Designed for professional surveyors and outdoor guides, this compass offers exceptional accuracy and durability. Features include:

• Global needle system for worldwide use
• Tool-free declination adjustment
• Built-in clinometer with percentage and degree scales
• Rare earth magnet for fast needle settling
• Sapphire jewel bearing
• Waterproof construction

Best for: ARDF competitors, antenna installers, and operators requiring surveyor-grade accuracy.

Military-Grade Durability

Cammenga 27CS Lensatic Compass (Tritium) Price Range: $120-180

This is the same compass used by the U.S. military and represents the pinnacle of mechanical compass durability. Key features:

• Self-luminous tritium dial markings (no batteries required)
• Waterproof to considerable depths
• Shock-resistant construction
• Copper induction damping for steady needle
• Magnifying lens for precise readings
• Lifetime warranty

Best for: Emergency responders, military operators, and anyone requiring maximum durability.

Silva Ranger 2.0 Price Range: $50-80

A excellent compromise between professional features and reasonable cost. This compass has been trusted by military forces worldwide:

• High-quality mirror sighting system
• Built-in inclinometer
• Adjustable declination
• Robust construction suitable for harsh conditions
• Luminous markings
• Lanyard included

Best for: Field Day operations, emergency kits, and general outdoor use.

Budget-Friendly Options

Suunto A-10 Recreational Compass Price Range: $20-35

While basic, this compass offers surprising accuracy for its price point:

• Simple, reliable operation
• Fixed declination scale
• Luminous markings
• Lightweight and compact
• Perfect for beginners

Best for: New operators, backup compass, or casual use.

Coghlan’s Pin-On Ball Compass Price Range: $8-15

Ultra-compact option for minimal weight situations:

• Weighs less than 0.5 ounces
• Pin-on design for easy attachment
• Surprisingly accurate for its size
• Liquid-filled for stability

Best for: Ultralight SOTA operations or emergency kit addition.

Electronic and Digital Options

Garmin Foretrex 701 Ballistic Edition Price Range: $400-500

This wrist-mounted GPS unit includes a high-quality digital compass:

• 3-axis compass with tilt compensation
• GPS and GLONASS compatibility
• APRS messaging capability
• Night vision compatibility
• Extremely rugged construction
• Long battery life

Best for: Technical operators, SAR teams, and military communications.

Garmin eTrex 32x Price Range: $200-250

Handheld GPS with excellent compass capabilities:

• 3-axis tilt-compensated compass
• Preloaded TopoActive maps
• Paperless geocaching support
• 25-hour battery life
• Rugged, waterproof design

Best for: SOTA/POTA operators who want GPS and compass in one unit.

Practical Tips for Using Compasses in Amateur Radio

Avoiding Common Mistakes

Magnetic Interference Radio equipment can significantly affect compass accuracy. Keep your compass at least 3-6 feet away from:

• Transceivers and power supplies
• Metal antenna elements
• Vehicle engines and electrical systems
• Large metal structures

Reading Errors Always ensure the compass is level when taking readings. Tilt can introduce significant errors, especially with basic compasses.

Declination Confusion Always verify whether your calculations require magnetic or true bearings, and adjust accordingly.

Advanced Techniques

Triangulation for ARDF Take bearings from at least three different locations to accurately pinpoint a transmitter’s location. The intersection of bearing lines on your map shows the target location.

Back-Bearings for Navigation When hiking to a remote operating location, periodically take back-bearings to known landmarks. This helps ensure you can find your way back if conditions deteriorate.

Bearing Averaging In windy conditions or when maximum accuracy is needed, take multiple readings and average them for better precision.

Integration with Maps and Planning Tools

Using Topographic Maps

Understanding how to use your compass with topographic maps opens up advanced possibilities:

Contour Line Analysis Topographic maps show elevation changes through contour lines. This information helps predict line-of-sight paths for VHF/UHF communications and identifies potential RF reflection points.

UTM Grid References Many modern maps include UTM (Universal Transverse Mercator) grid systems that work well with GPS coordinates and compass bearings.

Digital Map Integration

Google Earth and Mapping Software Most mapping applications can display magnetic declination information and show both true and magnetic bearings. This makes it easy to plan antenna orientations before arriving at your operating location.

Propagation Prediction Tools When using HF propagation prediction software, accurate bearing information helps interpret predictions and optimize antenna pointing.

Emergency Preparedness and Compass Use

Building Emergency Kits

Every amateur radio emergency kit should include a quality compass. Consider these factors:

Redundancy Include both a primary compass and a backup. Different types (mechanical and electronic) provide redundancy against different failure modes.

Waterproofing Ensure your compass can survive harsh weather conditions. Many emergencies occur during severe weather when navigation becomes most challenging.

Lighting Choose compasses with luminous markings or include a small flashlight or red LED light for night use.

Search and Rescue Applications

Amateur radio operators often support search and rescue operations. Compass skills become critical in these situations:

Grid Search Coordination SAR operations often use grid search patterns that require precise navigation. Being able to follow and report accurate bearings is essential.

Resource Location When coordinating multiple search teams, being able to provide accurate directions to resources (water, shelters, hazards) using compass bearings improves efficiency and safety.

International Considerations

Operating Abroad

If you travel internationally with your amateur radio equipment, consider these compass-related factors:

Magnetic Declination Variations Declination varies significantly around the world. Some areas have declination exceeding 30°, making accurate correction essential.

Global vs. Regional Compasses Some compasses are designed to work only in specific magnetic zones. Global compasses work everywhere but cost more.

Cultural and Legal Considerations Some countries have restrictions on navigation equipment. Research local regulations before traveling with compasses or GPS units.

The Science of Compass Accuracy

Understanding Limitations

Even the best compasses have limitations that amateur radio operators should understand:

Temperature Effects Extreme temperatures can affect compass accuracy. Most quality compasses include temperature compensation, but very cheap models may be significantly affected.

Magnetic Dip Near the magnetic poles, compass needles tend to point downward as well as northward. This “magnetic dip” can affect accuracy and is why some compasses are designed for specific geographic zones.

Local Magnetic Anomalies Some geographic areas have local magnetic anomalies caused by iron ore deposits or other geological features. These can cause compass errors of several degrees.

Calibration and Maintenance

Regular Calibration Checks Periodically verify your compass accuracy against known bearings. Sunrise and sunset directions can provide approximate east-west references.

Bubble Inspection Liquid-filled compasses sometimes develop bubbles over time. Small bubbles usually don’t affect accuracy, but large bubbles may indicate seal failure.

Future Technology and Compass Evolution

Emerging Technologies

MEMS Sensors Micro-electromechanical systems (MEMS) are making digital compasses smaller, more accurate, and less power-hungry. These sensors are now found in most smartphones and GPS units.

Satellite-Based Systems While GPS provides position information, emerging satellite systems may eventually provide precise heading information without relying on magnetic fields.

Integration with SDR Software-defined radio (SDR) technology might eventually integrate direction-finding capabilities directly into transceivers, potentially reducing the need for separate compass equipment.

Conclusion: Your Path to Better Communications

In our digital age, it’s easy to overlook simple tools like compasses in favor of high-tech solutions. However, as any experienced amateur radio operator will tell you, the best tools are often the simplest ones. A compass doesn’t need batteries, won’t crash, and works reliably in conditions that would disable electronic alternatives.

Whether you’re a new operator setting up your first antenna or an experienced DXer chasing rare contacts, investing in a quality compass will pay dividends in improved communications, enhanced safety, and greater confidence in your operating abilities. The compass won’t make you a better operator overnight, but it will give you the tools to make informed decisions about antenna pointing, site selection, and navigation.

Remember that like any tool, a compass is only as good as the operator using it. Take time to learn proper compass techniques, understand magnetic declination in your area, and practice using your compass in various conditions. The investment in time and money will reward you with years of improved amateur radio experiences.

From casual weekend operations to emergency communications, from competitive ARDF to serious DXing, a compass remains one of the most versatile and valuable tools in the amateur radio toolkit. Don’t let its simplicity fool you—in the hands of a knowledgeable operator, a compass can be the key to unlocking better communications and safer operations.

So the next time you’re packing your gear bag, make sure that humble compass has a place alongside your sophisticated radio equipment. Your future contacts will thank you for the stronger signals, and you’ll appreciate the confidence that comes from knowing exactly where you’re pointing your antenna and how to find your way home.

What’s your experience with compasses in amateur radio? Have you found particular models or techniques especially useful? Share your experiences with the amateur radio community—we all learn from each other’s successes and challenges.

Remember: The best compass is the one you have with you and know how to use. Start with a basic model, learn the fundamentals, and upgrade as your needs and experience grow.

The post The Amateur Radio Operator’s Guide to Compasses: Your Silent Signal Companion appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

In the world of amateur radio, many of us rely on Android apps for APRS tracking, repeater info, digital modes, and even remote rig control. But what if you want to run these apps on your Windows PC, whether for development, experimentation, or just convenience?

That’s where Android emulators come in.

These emulators allow you to install and run Android apps right on your Windows desktop — perfect for ham radio operators who want to monitor APRS traffic on a bigger screen, test Bluetooth TNCs, or run voice-over-IP apps like Zello without using a phone.

Let’s explore the best Android emulators for Windows and how they support various amateur radio use cases.

1. Android Studio Emulator (AVD) — Best for Developers and Experimenters

The Android Studio Emulator (AVD) is ideal if you’re building or testing your own ham radio apps. It’s the official Android emulator by Google.

Use cases:

• Testing a custom APRS beacon app before flashing it to a device.
• Simulating GPS movement for APRS route testing.
• Developing apps that interface with Bluetooth serial TNCs.
• Emulating multiple Android versions to ensure compatibility.

Example: You’re building a LoRa-based messaging app for Meshtastic. Instead of burning battery testing on your phone, you emulate it on your PC.

2. BlueStacks 5 — Best for Easy Setup and Performance

BlueStacks is known for gaming, but it also excels in running apps like EchoLink, Zello, and APRSdroid.

Use cases:

• Running EchoLink on your PC for hands-free operation.
• Using Zello with a USB microphone/headset.
• Setting up auto-start APRS map viewers in a dedicated window.
• Monitoring WeatherAlert or Windy apps during storm season.

Example: During field day or contest weekend, you open EchoLink on BlueStacks and operate voice nets while logging QSO info in another window.

3. LDPlayer — Lightweight and Fast for Utility Apps

LDPlayer runs great on mid-range PCs and offers good GPS mocking and performance.

Use cases:

• Monitoring APRS maps with APRSdroid or FindU-based viewers.
• Checking propagation conditions with apps like HF Conditions.
• Watching live weather satellite imagery with apps like MeteoEarth.
• Using Pocket RxTx for remote transceiver control.

Example: You’re remote-controlling your HF radio via Wi-Fi from your laptop, and need an Android app like Pocket RxTx running beside your logging software.

4. NoxPlayer — Rooted and Ham-Ready

NoxPlayer gives you more control with root access. It’s perfect for tinkering with SDR apps or anything requiring deeper access to Android.

Use cases:

• Running SDR Touch with virtual USB pass-through.
• Testing Bluetooth KISS TNCs before pairing with APRSDroid.
• Sideloading APKs from open-source ham apps not on the Play Store.
• Mocking GPS coordinates to test SOTA/POTA location-aware apps.

Example: You’re reviewing a Bluetooth KISS TNC. Before connecting it to your field device, you use NoxPlayer to validate the connection and beacon transmission.

5. Genymotion — Perfect for Testers and Devs

Genymotion is great for testing your apps on multiple Android versions. Though it’s a bit more developer-focused, it’s ideal for experimenters.

Use cases:

• Testing custom-built apps like SOTA Spot Bot.
• Validating UX across Android 9 to Android 13.
• Running multiple virtual devices for APRS message parsing.
• Creating a virtual lab for APRS-to-Meshtastic gateway testing.

Example: You’re simulating how APRS messages are parsed in your Telegram bot gateway. With Genymotion, you spin up two virtual Android phones to simulate two different users sending messages.

6. MEmu Play — Balanced and Multi-Instance Friendly

MEmu offers solid performance with support for multiple instances and multiple Android versions.

Use cases:

• Running multiple APRS maps at once (useful for digipeater ops).
• Switching between HF band conditions, satellite tracking, and logbook apps.
• Using RepeaterBook and RFinder with real-time GPS emulation.
• Running Fldigi-compatible apps via audio loopback with Windows.

Example: You’re at your shack desk and want a dedicated map view for APRS, a weather radar window, and WSPRnet map viewer, all side-by-side — all from Android apps in MEmu.

Real-World Examples for Ham Ops

Here’s a breakdown of real-world ham scenarios where Android emulators become powerful tools:

Final Thoughts

For amateur radio enthusiasts, Android emulators offer a powerful way to expand your shack’s capabilities — without buying another device.

Want to simulate APRS paths before field testing? Debug Bluetooth TNCs? Use EchoLink hands-free during nets? Or maybe just keep a dedicated APRS map window open on your second monitor?

There’s an emulator for that.

The post Best Android App Emulators for Windows — A Handy Tool for Amateur Radio Enthusiasts appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

In today’s fast-evolving battlefield and emergency response environments, communication is everything. Modern tactical radios have come a long way from bulky, single-function devices to sophisticated, multi-capability systems. These radios provide secure, reliable, and flexible communication to military personnel, first responders, and tactical teams operating in challenging conditions.

But what exactly makes up a modern tactical radio? In this post, we’ll explore the common components that enable these rugged devices to deliver critical communications anywhere, anytime.

1. Software-Defined Radio (SDR) Core: The Brain of Modern Radios

At the heart of most modern tactical radios lies the Software-Defined Radio (SDR) platform. Unlike traditional radios built with fixed hardware for specific frequencies and functions, SDRs rely on software to control how the radio transmits and receives signals.

This means a single radio can support multiple frequency bands, waveforms, and modulation schemes simply by updating its software — providing unparalleled flexibility and future-proofing for various missions.

2. Transceiver Module: Sending and Receiving Signals

The transceiver is the fundamental hardware that converts electrical signals to radio waves and vice versa. Modern tactical radios typically support a wide range of frequencies — from VHF and UHF bands to sometimes even HF — allowing communication over short and long distances.

Equipped with advanced power amplifiers and low-noise receivers, these modules ensure clear and reliable voice and data transmission in demanding environments.

3. Antenna System: Your Radio’s Connection to the World

A radio’s antenna is its link to the airwaves. Tactical radios usually come with rugged, detachable antennas designed to survive rough handling and harsh environments. Different antenna types—omni-directional for general coverage or directional for focused communication—are used depending on the mission.

Some radios even support antenna diversity, using multiple antennas to improve signal reception and combat interference.

4. User Interface: Control at Your Fingertips

A well-designed user interface (UI) is crucial for ease of use under stressful, fast-moving situations. Modern tactical radios feature rugged keypads or touchscreens with clear displays that show frequency, signal strength, battery status, and more.

These interfaces are built to be intuitive and operable even while wearing gloves, ensuring operators can focus on the mission, not the device.

5. Power Supply and Battery: Staying Powered in the Field

Mobility demands reliable, long-lasting power sources. Lithium-ion or Lithium Iron Phosphate (LiFePO4) batteries are standard, offering high energy density and safety.

Quick-swap designs, external power options, and efficient power management help keep tactical radios running throughout extended missions without interruption.

6. Encryption Module: Keeping Communications Secure

Security is paramount in tactical communications. Modern radios include hardware or software-based encryption modules that protect sensitive voice and data transmissions from interception.

Using military-grade encryption standards like AES-256, these radios ensure that only authorized personnel can access the communication.

7. Waveform Support: Flexibility to Adapt

Tactical radios support a range of communication waveforms — the “languages” of radio signals. From legacy analog FM to advanced digital protocols such as SINCGARS, HAVE QUICK, or MANET, these radios adapt to different environments and interoperability needs.

Frequency hopping and spread spectrum techniques are commonly used to resist jamming and improve communication resilience.

8. Data Interface Ports: Connectivity and Expansion

Modern tactical radios include multiple interface ports—USB, Ethernet, audio jacks, and proprietary connectors—for programming, data transfer, and accessory attachment.

This allows seamless integration with GPS devices, headsets, computers, and other tactical equipment.

9. GPS Receiver: Navigation and Coordination

Many tactical radios feature an integrated GPS receiver, enabling real-time location tracking and time synchronization.

Sharing GPS data enhances situational awareness, helps coordinate movements, and supports network synchronization for secure communication.

10. Ruggedization and Environmental Protection: Built to Last

Tactical radios are designed to endure the harshest conditions. Meeting military standards such as MIL-STD-810 and IP67 rating, they resist shocks, vibrations, water, dust, and extreme temperatures.

This ruggedness guarantees reliable operation no matter the terrain or weather.

11. Networking Capabilities: Beyond Point-to-Point Communication

Modern radios don’t just talk one-to-one; they form dynamic mesh networks allowing multiple units to communicate seamlessly without centralized infrastructure.

With IP-based communication and integration with satellite links, tactical radios ensure continuous connectivity on the move and across challenging terrains.

Final Thoughts

The common components of modern tactical radios come together to create communication tools that are powerful, adaptable, and secure — essential for success in military and emergency operations. Advances in software, hardware, and networking continue to push the boundaries of what these radios can do, helping teams stay connected when it matters most.

The post The Common Components of Modern Tactical Radios: What Powers Today’s Battlefield Communications appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Interested in getting into amateur radio, but not licensed yet? You can start listening to your local repeater activity using a Raspberry Pi, an RTL-SDR USB dongle, and a simple external speaker — all without transmitting a single signal.

In this post, I’ll walk you through how to set up the RTL-SDR, connect it to an external speaker, and listen in to real amateur radio conversations. It’s a great way to learn, get familiar with local activity, and prepare for your amateur radio examination.

What You’ll Need

• Raspberry Pi 3, 4, or Zero 2 W (with Raspberry Pi OS)
• RTL-SDR USB dongle (e.g., RTL2832U chipset)
• Internet access (for setup)
• 3.5mm audio speaker or powered USB speaker
• Basic VHF/UHF antenna (or better)

Optional:

• External case/cooler for the RTL-SDR
• Monitor and keyboard (or SSH access)

Step 1: Install Required Software

Open a terminal on your Raspberry Pi and install the RTL-SDR tools:

sudo apt update && sudo apt upgrade -y
sudo apt install rtl-sdr sox pulseaudio pavucontrol

Install gqrx if you want a GUI receiver (optional but requires desktop environment):

sudo apt install gqrx-sdr

Step 2: Test the RTL-SDR Dongle

Before going further, plug in your RTL-SDR and test detection:

rtl_test

If you see something like Found 1 device(s), you’re good to go.

If you see a message about a conflicting DVB driver, disable it:

sudo nano /etc/modprobe.d/no-rtl.conf

Add:

blacklist dvb_usb_rtl28xxu
blacklist rtl2832
blacklist rtl2830

Then reboot:

sudo reboot

Step 3: Install and Use rtl_fm to Listen

rtl_fm is a command-line tool to tune your RTL-SDR to a frequency and demodulate FM signals.

Example: To listen to a repeater at 147.000 MHz (standard NBFM):

rtl_fm -f 147M -M fm -s 22050 -r 22050 - | play -r 22050 -t raw -e s -b 16 -c 1 -

If audio is too quiet or noisy, adjust gain:

rtl_fm -f 147M -M fm -s 22050 -g 35 - | play -r 22050 -t raw -e s -b 16 -c 1 -

You can replace 147M with the frequency of your local repeater (see next section).

Step 4: Find Your Nearest Repeaters

You can find repeater info at:

• https://www.repeaterbook.com (worldwide)
• Alternatively, scan VHF band (144–148 MHz) using gqrx or rtl_power

Step 5: Use an External Speaker

If you’re using a 3.5mm analog speaker:

• Make sure audio is not muted
• Set output to headphone or 3.5mm jack:

sudo raspi-config

Select System Options > Audio > 3.5mm jack

For USB speakers, use:

pavucontrol

And route audio to your USB device.

Step 6: Automate with a Simple Script

Create a file called listen-repeater.sh:

#!/bin/bash
FREQ="147M"  # Change this to your local repeater
GAIN=35
rtl_fm -f $FREQ -M fm -s 22050 -g $GAIN - | play -r 22050 -t raw -e s -b 16 -c 1 -

Make it executable:

chmod +x listen-repeater.sh
./listen-repeater.sh

Why This Is Perfect for Beginners

• No license is needed to receive amateur radio
• You learn common repeater etiquette and callsigns
• Helps familiarize you with how hams talk, what equipment they use, and the structure of QSOs

Once licensed, you’ll already know your local frequencies, who’s active, and how to engage — making your first QSO less intimidating!

Tips

• Use a better antenna to improve reception — even a mag-mount antenna placed near a window helps
• Monitor repeater nets to learn procedure and voice flow
• Try decoding digital modes later with tools like multimon-ng or fldigi

Ready to Get On the Air?

Listening to local repeaters is the gateway to amateur radio. Using an RTL-SDR with a Raspberry Pi is an affordable, educational way to immerse yourself in the hobby before you even get your license. Once you’re ready, take the exam, get your callsign, and join the conversation.

The post How to Use an RTL-SDR with a Raspberry Pi to Listen to Amateur Radio Repeaters appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

In the modern battlespace, communication is not just a support function—it’s a weapon. Tactical radios have evolved far beyond simple voice transmission devices. They are now high-tech platforms packed with software-defined flexibility, encrypted networking, GPS integration, anti-jam resilience, and even artificial intelligence. Let’s explore the key capabilities that define today’s modern tactical radios, and the technologies driving their performance on the frontlines.

1. Software-Defined Radio (SDR)

The cornerstone of modern tactical communication is software-defined radio (SDR). Unlike traditional radios built for a specific band or protocol, SDRs use software to switch between frequencies, waveforms, and modes in real-time.

Features:

• Supports multiple waveforms (e.g., SINCGARS, HAVEQUICK, TSM-X, NATO STANAGs)
• Reprogrammable for future upgrades
• Combines voice, data, and video in a single unit
• Interoperable across joint and coalition forces

Example Systems:

• L3Harris Falcon III AN/PRC-117G
• Thales SYNAPS
• Rohde & Schwarz SOVERON

2. Frequency Hopping and Spread Spectrum

To survive in electronic warfare environments, tactical radios use frequency hopping—rapidly switching frequencies hundreds of times per second based on a cryptographic algorithm.

Benefits:

• Highly resistant to jamming and interception
• Works seamlessly with time synchronization (GPS-based or internal clock)
• Often combined with direct sequence spread spectrum (DSSS) for further resilience

Real-World Application:

• Used in SINCGARS and HAVEQUICK radios
• Essential in environments with known enemy jamming capability

3. Advanced Encryption and COMSEC

Security is paramount. Modern radios embed NSA-approved or military-grade AES encryption to protect sensitive communications from interception or spoofing.

Capabilities:

• Over-the-air rekeying (OTAR)
• Two-factor authentication (device + crypto key)
• End-to-end encrypted voice, data, and control signals
• Secure interoperability with allied forces

4. Multi-Band and Multi-Mode Operation

Modern radios support simultaneous operation across HF, VHF, UHF, and SATCOM bands, providing flexibility across all tactical levels.

What This Enables:

• HF for long-distance, BLOS communication
• VHF/UHF for local line-of-sight (LOS)
• SATCOM for global connectivity
• Seamless transition between ground, airborne, and naval assets

5. Satellite Communication (SATCOM)

SATCOM-enabled tactical radios provide global reach, especially when line-of-sight communication is impossible (e.g., in mountainous or urban terrain).

Highlights:

• Integration with MUOS, Inmarsat, Iridium, and military satellites
• Works with manpack, vehicular, and airborne platforms
• Supports real-time voice, data, and video

6. Tactical Mesh Networking

Mesh radios create self-forming, self-healing networks that adapt dynamically to changes in topology, ideal for decentralized operations.

Key Technologies:

• Mobile Ad Hoc Networks (MANETs)
• Supports simultaneous data/video/telemetry
• Nodes automatically route around interference or damage

Used In:

• Dismounted troops
• Unmanned ground vehicles (UGVs)
• Drones (UAVs) and special operations

Examples:

• Persistent Systems Wave Relay
• Silvus Technologies StreamCaster

7. GPS Integration and Blue Force Tracking

Tactical radios now often include built-in GPS and situational awareness tools, allowing real-time tracking of friendly units (BFT).

Capabilities:

• Real-time location updates to command center
• Integrated mapping overlays and navigation aids
• Alerts for proximity to enemies or designated zones

8. Cognitive and Adaptive Radios (Next-Gen)

Cutting-edge military radios are beginning to include AI-driven features, adapting to RF environments on the fly.

What’s Emerging:

• Real-time spectrum analysis to avoid jamming
• Autonomous waveform selection
• Intelligent routing across mesh, SATCOM, and terrestrial links

Strategic Benefit:

• Resilience in denied environments (e.g., GPS or SATCOM degradation)
• Reduced human workload for radio configuration

9. Automatic Link Establishment (ALE)

Used primarily in HF radios, ALE automates the process of finding the best frequency and link conditions—critical for long-range BLOS communications.

Benefits:

• Reduces operator workload
• Establishes secure links automatically
• Compatible with digital and encrypted modes

10. Modular and Scalable Design

Modern radios follow a modular hardware design, allowing militaries to tailor systems to mission requirements without swapping entire platforms.

Modular Options:

• Hot-swappable batteries
• Expansion modules (SATCOM, crypto, data)
• Remote control via smartphone or rugged tablets

Final Thoughts

The modern tactical radio is no longer just a microphone and speaker—it’s a smart, secure, adaptive communication platform. From manpack radios on the battlefield to mesh radios linking UAVs and autonomous vehicles, the integration of SDR, encryption, AI, and satellite capability makes these systems vital to modern warfare.

As radio enthusiasts and amateur operators, understanding these technologies offers a glimpse into how innovation in military communications often filters down into civilian and ham radio advancements.

The post Key Capabilities of Modern Tactical Radios appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Before container technologies like Docker came into play, applications were typically run directly on the host operating system—either on bare metal hardware or inside virtual machines (VMs). While this method works, it often leads to frustrating issues, especially when trying to reproduce setups across different environments.

This becomes even more relevant in the amateur radio world, where we often experiment with digital tools, servers, logging software, APRS gateways, SDR applications, and more. Having a consistent and lightweight deployment method is key when tinkering with limited hardware like Raspberry Pi, small form factor PCs, or cloud VPS systems.

The Problem with Traditional Software Deployment

Let’s say you’ve set up an APRS iGate, or maybe you’re experimenting with WSJT-X for FT8, and everything runs flawlessly on your laptop. But the moment you try deploying the same setup on a Raspberry Pi or a remote server—suddenly things break.

Why?

Common culprits include:

• Different versions of the operating system
• Mismatched library versions
• Varying configurations
• Conflicting dependencies

These issues can be particularly painful in amateur radio projects, where specific software dependencies are critical, and stability matters for long-term operation.

You could solve this by running each setup inside a virtual machine, but VMs are often overkill—especially for ham radio gear with limited resources.

Enter Docker: The Ham’s Best Friend for Lightweight Deployment

Docker is an open-source platform that allows you to package applications along with everything they need—libraries, configurations, runtimes—into one neat, portable unit called a container.

Think of it like packaging up your entire ham radio setup (SDR software, packet tools, logging apps, etc.) into a container, then being able to deploy that same exact setup on:

• A Raspberry Pi
• A cloud server
• A homelab NUC
• Another ham’s machine

Why It’s Great for Hams:

• Lightweight – great for Raspberry Pi or low-power servers
• Fast startup – ideal for services that need to restart quickly
• Reproducible environments – makes sharing setups with fellow hams easier
• Isolation – keeps different radio tools from interfering with each other

Many amateur radio tools like Direwolf, Xastir, Pat (Winlink), and even JS8Call can be containerized, making experimentation safer and more efficient.

Virtual Machines: Still Relevant in the Shack

Virtual Machines (VMs) have been around much longer and still play a crucial role. Each VM acts like a complete computer, with its own OS and kernel, running on a hypervisor like:

• VirtualBox
• VMware
• KVM
• Hyper-V

With VMs, you can spin up an entire Windows or Linux machine, perfect for:

• Running legacy ham radio software (e.g., old Windows-only apps)
• Simulating different operating systems for testing
• Isolating potentially unstable setups from your main system

However, VMs require more horsepower. They’re heavy, boot slowly, and take up more disk space—often not ideal for small ham radio PCs or low-powered nodes deployed in the field.

Quick Comparison: Docker vs Virtual Machines for Hams

Ham Radio Use Cases for Docker

Here’s how Docker fits into amateur radio workflows:

• Run an APRS iGate with Direwolf and YAAC in isolated containers.
• Deploy SDR receivers like rtl_433, OpenWebRX, or CubicSDR as containerized services.
• Set up a Winlink gateway using Pat + ax25 tools, all in one container.
• Automate and scale your APRS bot, or APRS gateway using Docker + cron + scripts.

Docker makes it easier to test and share these setups with other hams—just export your Docker Compose file or image.

When to Use Docker, When to Use a VM

Use Docker if:

• You’re building or experimenting with modern ham radio apps
• You want to deploy quickly and repeatably
• You’re using Raspberry Pi, VPS, or low-power hardware
• You’re setting up CI/CD pipelines for your scripts or bots

Use VMs if:

• You need to run legacy apps (e.g., old Windows logging software)
• You want to simulate full system environments
• You’re working on something that could crash your main system

Final Thoughts

Both Docker and VMs are powerful tools that have a place in the modern ham shack. Docker offers speed, portability, and resource-efficiency—making it ideal for deploying SDR setups, APRS bots, or automation scripts. VMs, on the other hand, still shine when you need full system emulation or deeper isolation.

At the end of the day, being a ham means being an experimenter. And tools like Docker just give us more ways to explore, automate, and share our radio projects with the world.

The post Docker vs Virtual Machines: What Every Ham Should Know appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

What is Pulsar?

Pulsar is a next-generation electromagnetic warfare system designed to provide real-time threat detection and response using AI-driven adaptability. Unlike conventional EW systems, which require extensive reprogramming to handle new adversarial signals, Pulsar integrates on-board GPU computing, machine learning algorithms, and software-defined radios (SDR) to instantly analyze, identify, and neutralize emerging threats.

Its modular design allows for seamless integration across various platforms, making it a truly versatile EW solution. Whether deployed on the ground, in the air, or in fixed-site installations, Pulsar ensures that forces stay ahead of the adversary.

Key Capabilities of Pulsar

• Rapid Threat Identification & Countermeasures – Uses AI-powered algorithms to analyze and respond to new threats almost instantly.
• Modular and Scalable Form Factor – Can be adapted for ground vehicles (Pulsar-V), airborne platforms (Pulsar-A), or fixed-site installations.
• Networked EW for Distributed Operations – Multiple Pulsar units can be linked together to provide a comprehensive and adaptable electromagnetic shield.
• Multi-Mission Platform – Designed to support a variety of electronic attack, electronic support, and electronic protection missions.

Pulsar Variants for Every Mission

Anduril’s Pulsar system is available in multiple configurations to ensure maximum flexibility and effectiveness in the field:

• Pulsar (Fixed-Site Configuration) – Provides 360-degree or directional detection and denial, offering full-spectrum coverage that adapts to different operational environments.
• Pulsar-V (Vehicle-Mounted Variant) – Designed for ground mobility, this variant can be mounted on various military vehicles using a standard NATO mount.
• Pulsar-A (Airborne Payload) – Built for manned and unmanned aircraft, Pulsar-A extends EW capabilities to aerial platforms, ensuring comprehensive electromagnetic dominance.

Why Pulsar is a Game-Changer

Pulsar sets itself apart by enabling forces to counter threats at the speed of relevance. By combining AI-driven adaptability, modular scalability, and networked EW capabilities, it delivers a future-proof solution for modern defense forces. Instead of waiting years for system updates, operators can deploy and update Pulsar’s software within days, keeping pace with the rapidly shifting electronic battlespace.

While Pulsar is not currently approved for commercial use in the U.S., it is available for purchase by the U.S. federal government and foreign national governments under applicable laws and regulations.

Anduril: Pioneering the Future of Defense Technology

At Anduril, innovation is at the heart of everything we do. From counter-UAS systems to advanced autonomous platforms, we are committed to equipping modern warfighters with the most advanced, AI-driven defense solutions available today.

With Pulsar, the future of electromagnetic warfare is here—adaptive, networked, and always mission-ready.

For more information, visit Anduril Industries or contact us at contact@anduril.com.

The post Revolutionizing Electromagnetic Warfare with Anduril’s Pulsar appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Software-defined radio (SDR) enthusiasts and amateur radio operators seeking an affordable yet powerful solution will find the Radioberry an exciting project to explore. Designed as a Raspberry Pi HAT, the Radioberry transforms a Raspberry Pi into a fully functional SDR transceiver, making it an excellent choice for radio experimentation and communication.

What is Radioberry?

The Radioberry is an open-source SDR transceiver designed to cover the 0-30 MHz frequency range. It leverages an Analog Devices AD9866 chipset, originally intended as a broadband modem mixed signal front-end, repurposed for Direct Down Conversion (DDC) and Direct Up Conversion (DUC) functionality. This design enables high-performance SDR capabilities with a 12-bit resolution, making it ideal for amateur radio and other radio-related applications.

At the core of the Radioberry is an Intel Cyclone 10LP FPGA, which supports 10CL16 and 10CL25 models. The FPGA firmware is dynamically loaded via the Raspberry Pi, providing a streamlined and flexible setup without the need for external programming hardware. The power supply for the Radioberry is conveniently drawn from the Raspberry Pi, simplifying the overall design and integration.

Why Choose Radioberry?

Radioberry stands out as a compelling choice for SDR enthusiasts due to its:

• Compact form factor: Seamlessly integrates with Raspberry Pi.
• Open-source philosophy: Both hardware and software are freely available.
• Cost-effective design: A budget-friendly alternative to commercial SDR solutions.
• Flexibility: Supports various modes and can be customized to meet specific needs.

Radioberry 2.x – Enhanced Performance & Features

The Radioberry 2.x builds on the original design, offering improved performance and additional features. Enthusiasts can find comprehensive details, including schematics, installation guides, and firmware updates, in the resources below.

Resources for Builders

For those interested in building their own Radioberry SDR transceiver, here are some valuable resources:

• Discussion & Community Support: Google Groups discussion forum
• Source Code & Firmware: Radioberry GitHub Repository
• Technical Documentation: Radioberry WIKI with additional information
• Installation & Setup Guide: Radioberry Releases for easy installation
• Hardware Design: Radioberry Schematic
• Real-World Applications: Radioberry transceiver insights by Gopan VU2XTO
• User Demonstrations: Recording of Radioberry 2 in action by Jacinto CU2ED

A Project for Radio Enthusiasts

The Radioberry is more than just a radio project—it’s a testament to the power of open-source collaboration and the ingenuity of the amateur radio community. This project is not for sale but rather an open-source initiative to empower builders and experimenters worldwide.

For those looking to dive into SDR development, experiment with amateur radio, or explore FPGA-based radio solutions, the Radioberry is a fantastic place to start.

Visit https://www.pa3gsb.nl/

The post Radioberry: A Raspberry Pi-Based SDR Transceiver appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Software-defined radio (SDR) has transformed how we interact with radio signals, and SDRBerry aims to push this transformation further. SDRBerry is an ongoing project designed to integrate an SDR transceiver with a Raspberry Pi, leveraging the power of LVGL v8 for a modern GUI experience. While still in development, this project offers a unique learning opportunity in C++ programming, Liquid DSP, and GUI design.

Project Overview

SDRBerry is built with the goal of supporting various SDR devices, including:

• Adalm Pluto SDR
• Radioberry
• RTL-SDR
• SDRPlay
• Other SDR receivers via SoapySDR

The system also aims to integrate optical encoders, I2C/serial-controlled bandpass filters, and an ESP32-based CAT controller for additional hardware control.

Installation Guide

To install SDRBerry, follow these steps:

1. Set up Raspberry Pi OS (64-bit Bullseye) in CLI mode.
2. Use Raspberry Pi Imager to create a bootable SD card or USB stick (USB storage is preferred for longevity).
3. Configure Wi-Fi and enable I2C using raspi-config.
4. Compile the software using VisualGDB, CMake, GCC, and GFortran.
5. Enable remote control with framebuffer VNC using framebuffer-vncserver.

A full installation guide is available in install_guide.txt, and an installation script (install.sh) automates the process.

Hardware Requirements

• Raspberry Pi 4 Model B
• 5-inch or 7-inch 800×480 touchscreen (DSI connector recommended)
• USB storage device (e.g., Samsung Fit Plus 32GB or larger)
• Generic USB audio adapter

Features and Development Progress

Completed Features:

Adalm Pluto, RTL-SDR, SDRPlay, Radioberry, and HackRF support
FM broadband and narrowband reception
SSB transmission and reception
USB CAT interface support (e.g., ESP32 as a CAT controller)
I2C filter support with PCF8574
Noise reduction (ported from DD4WH’s implementation)
Morse code decoder
FT8 transmission and reception
Web-based remote control via Vue.js 3 and PrimeVue UI (experimental)

Upcoming Features:

• MIDI controller support
• Direct optical encoder support via GPIO
• Network and Wi-Fi setup screen
• Additional noise reduction algorithms (e.g., LMS filtering)
• Codec2 implementation for FreeDV digital voice

Installation of Dependencies

SDRBerry relies on several open-source libraries, including:

• Liquid-DSP (Joseph D. Gaeddert)
• Alsa Audio
• SoapySDR and SoapyPlutoSDR
• FFTW (Fast Fourier Transform)
• CivetWeb (embedded web server)
• nlohmann-json (JSON library for C++)

To install and compile the software, use:

wget https://raw.githubusercontent.com/paulh002/sdrberry/master/install/install.sh
chmod +x install.sh
./install.sh HFB DSI

For Raspberry Pi Touch 2 with Radioberry:

./install.sh RDB T2

Running SDRBerry

To start SDRBerry in user mode or root mode (depending on the SDR device used):

sudo sdrberry > sdrberry.log 2>&1

Mouse support is included, with optimized responsiveness via usbhid.mousepoll=2 in cmdline.txt.

Web-Based Control

SDRBerry introduces an experimental web-based remote control on port 8081. The interface, built using Vue.js 3 and PrimeVue UI, allows users to control SDRBerry remotely. The source code will be available in a separate repository.

To access the web interface:

http://raspberry_pi_ip:8081

Conclusion

SDRBerry is an exciting open-source SDR project that integrates Raspberry Pi, LVGL GUI, and SDR technologies. While still in active development, the project offers a strong foundation for experimenting with software-defined radio on a compact and affordable platform.

For more details and the latest updates, visit the SDRBerry GitHub repository:
https://github.com/paulh002/sdrberry

The post Exploring SDRBerry: A Raspberry Pi-Based SDR Transceiver with LVGL GUI appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Are you passionate about radio technology, signal tracking, or even advanced applications like beamforming and interferometry? If so, KrakenSDR is the ultimate tool you need. This powerful, coherent software-defined radio (SDR) opens up a world of possibilities for professionals, hobbyists, and emergency responders alike.

What is KrakenSDR?

KrakenSDR is a cutting-edge, five-channel coherent-capable SDR system designed for high-precision applications such as radio direction finding (RDF) and beamforming. Unlike traditional SDRs, KrakenSDR ensures phase coherence across its five channels, making it an invaluable asset for tracking radio signals with pinpoint accuracy.

Why Choose KrakenSDR?

With its ability to detect and locate unknown transmissions, KrakenSDR is ideal for:

• Finding Unknown Transmitters: Locate sources of interference, illegal broadcasts, or rogue transmissions.
• HAM Radio Experiments: Engage in exciting radio fox hunts and monitor repeater abuse.
• Asset & Wildlife Tracking: Use low-power beacons to track animals, lost ships, or valuable assets beyond network coverage.
• Emergency Search & Rescue: Locate emergency beacons with ease, aiding in life-saving missions.
• Interferometry & Beamforming: Perfect for radio astronomy and advanced signal processing applications.

Advanced Radio Direction Finding (RDF)

KrakenSDR employs correlative interferometry—a highly advanced RDF technique that leverages phase information from an antenna array. Unlike simple directional antennas that require manual adjustments, KrakenSDR automates the process with precision algorithms like MUSIC, allowing for fast and accurate triangulation of any signal source.

What You Need to Get Started

Setting up your KrakenSDR system is easy. You’ll need:

• A KrakenSDR unit
• A five-element antenna array (such as the Krakentenna magnetic whip set)
• A Raspberry Pi 4 (or similar computing device) to run the KrakenSDR software
• An Android device for mobile tracking and mapping (optional)
• A USB Type-C cable & 5V/2.4A+ power supply

How KrakenSDR Achieves Coherence

KrakenSDR integrates five customized RTL-SDR circuits, each featuring R820T2 tuners and RTL2832U ADC chips, all synchronized to a single local oscillator. This ensures that all received signals maintain phase stability. Additional built-in calibration hardware fine-tunes these signals, eliminating phase offsets and improving accuracy.

Hardware Highlights

• Five-channel RTL-SDR with phase coherence
• 24 MHz – 1766 MHz tuning range
• SMA female RF input ports
• Bias tee (4.5V) for active antennas
• Rugged aluminum enclosure with heat management
• USB Type-C power and data connections

Open-Source Software & Mobile Integration

KrakenSDR provides open-source Data Acquisition (DAQ) and Digital Signal Processing (DSP) software. The DSP software implements advanced RDF algorithms and integrates seamlessly with GNU Radio. Additionally, KrakenSDR offers:

• An Android App: Automatically determines transmitter locations and provides turn-by-turn navigation.
• A Web Interface: Configure frequencies, gains, and monitor real-time signal data.
• Cloud-Based Mapping (Alpha): Log and visualize transmitter locations across multiple sites.

Real-World Applications

Imagine mounting a KrakenSDR antenna array on your vehicle’s roof, connecting it to a Raspberry Pi and an Android phone. As you drive, KrakenSDR continuously calculates signal bearings, mapping their sources in real-time. Within minutes, you can locate a signal with unmatched accuracy. Whether you’re hunting down interference, conducting radio experiments, or aiding in search and rescue, KrakenSDR is your ultimate solution.

Get Started with KrakenSDR Today!

KrakenSDR is revolutionizing the way we track, locate, and analyze radio signals. Whether you’re a researcher, amateur radio enthusiast, or emergency responder, this device is a game-changer.

Ready to take your SDR experience to the next level? Visit KrakenSDR and get yours today!

The post Unlock the Power of Radio Direction Finding with KrakenSDR appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

For radio enthusiasts, shortwave listeners, and amateur radio operators, having a reliable and feature-rich Software-Defined Radio (SDR) receiver is essential. The Raddy Malahit DSP2 is an advanced full-band, multi-mode receiver designed for seamless signal reception across a vast frequency range from 10kHz to 2GHz. With its powerful DSP technology, built-in CW decoder, and modern IPS touchscreen, this compact device offers exceptional performance for both casual and serious radio hobbyists.

Unmatched Frequency Coverage & Mode Support

The DSP2 provides comprehensive support for multiple modes, making it a versatile tool for exploring different parts of the radio spectrum. Whether you’re tuning into broadcast FM stations, listening to amateur radio transmissions, or decoding digital signals, the DSP2 ensures flawless reception in:

NFM (Narrowband FM)
WFM (Wideband FM)
AM (Amplitude Modulation)
SSB (Single Sideband – USB/LSB)
DSB (Double Sideband)
CW (Continuous Wave – Morse Code)
RTTY (Radioteletype)
FT8 (Weak Signal Digital Mode)

Cutting-Edge Display & User-Friendly Interface

Navigating and operating the DSP2 is effortless, thanks to its 3.5-inch IPS color touchscreen. The responsive waterfall and spectrum display allow users to visualize signals in real-time, making tuning and signal tracking much easier. Additionally, physical knobs provide fine control over frequency and volume, ensuring a smooth user experience.

3.5″ Touchscreen: Displays waterfall & spectrum patterns
Touch & Knob Control: Allows precise tuning and adjustments
User-Friendly Interface: Intuitive layout for easy operation

Exceptional Signal Clarity with Advanced SDR Technology

Built on a high-sensitivity SDR structure, the DSP2 is engineered for clear and crisp reception, even in challenging signal environments. It integrates advanced digital signal processing (DSP) techniques to filter, amplify, and process signals with impressive precision.

Built-in CW Decoder – Automatically deciphers Morse code transmissions
Adaptive Noise Reduction (NR) – Reduces background noise for better clarity
Threshold Noise Reduction – Enhances weak signal readability
Noise Blanker (NB) – Eliminates impulsive noise for smoother reception
Automatic Gain Control (AGC) – Adjusts signal strength dynamically
Automatic Notch Filter (ANF) – Suppresses unwanted interference

Long-Lasting Battery & Portability

The DSP2 is powered by a 5000mAh lithium-ion battery, providing extended operating time for long listening sessions. The Type-C fast charging capability ensures quick recharges, making it perfect for field use or portable operations.

5000mAh Battery: Extended operation without frequent recharging
USB Type-C Charging: Fast and convenient power replenishment
Compact & Durable: Sturdy aluminum alloy construction with IP6X-rated mechanical encoders

Premium Features for Enhanced Listening

The DSP2 is designed for flexibility and enhanced user experience, offering additional features that set it apart from standard SDR receivers:

Adjustable Filter Width – Fine-tune filters for optimal signal isolation
Stereo FM with RDS Support – Enjoy clear FM radio with station info
Simulated Stereo & Equalizer – Customize audio settings for better sound quality
High Impedance Mode – Enables superior antenna compatibility
Bias Tee Power – Supports external active antennas for improved reception
Built-in Pre-Amplifier – Enhances weak signals for better performance
Front Cavity Dual-Diaphragm Speakers – Delivers clear, high-quality audio

Technical Specifications

Frequency Range: 10kHz-380MHz, 404MHz-2GHz
Panorama Width: 192kHz, 96kHz, 48kHz
Sensitivity: 0.3µV up to 1GHz
Dynamic Bandwidth: 82dB
Antenna Connector: 50Ω SMA Female
Screen: 3.5″ IPS Color Touchscreen
Hardware Version: 2.4

What’s Included in the Box?

When you purchase the Raddy Malahit DSP2, you receive a complete package that includes:

1 x Raddy Malahit DSP2 Radio
1 x Antenna
1 x Stand
1 x Lanyard
1 x Type-C Charging Cable
2 x Spare Knobs
1 x EVA Carrying Bag
1 x 3M Transparent Foot Pad
1 x User Manual

Final Thoughts: Is the Raddy Malahit DSP2 Worth It?

The Raddy Malahit DSP2 is a powerful, compact, and versatile SDR receiver that delivers exceptional performance across a broad frequency range. Whether you’re a radio hobbyist, amateur operator, shortwave listener, or digital mode enthusiast, this device offers advanced features, superb signal clarity, and long battery life.

With its modern touchscreen display, built-in decoding capabilities, and extensive mode support, the DSP2 is a top-tier choice for those seeking a high-performance portable SDR receiver.

Ready to explore the airwaves? The Raddy Malahit DSP2 is your perfect companion!

Visit https://radioddity.refr.cc/

The post Discover the Raddy Malahit DSP2 SDR: A Feature-Rich Software-Defined Radio appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

As an amateur radio operator, having a reliable internet connection is essential for various activities such as APRS (Automatic Packet Reporting System), EchoLink, D-STAR, FT8, Winlink, and remote station control. Your DNS (Domain Name System) settings can significantly impact your connection speed and reliability. A slow DNS server can introduce latency, delay crucial packet transmissions, and degrade real-time communications. That’s where a DNS Speed Test Benchmark tool comes in handy!

What is a DNS Speed Test?

A DNS Speed Test is a tool that helps you find the fastest DNS server based on your location and network conditions. By performing real-time tests, this tool determines which DNS servers offer the lowest latency, fastest resolution times, and most stable performance. For amateur radio operators who rely on internet-based communications, selecting an optimal DNS server ensures smooth and reliable connectivity for VoIP links, digital modes, and APRS gateways.

Why is DNS Speed Important for Ham Radio Operators?

DNS resolution time directly impacts how fast your device connects to internet services. A faster DNS means:

• Reduced APRS beaconing delay – Essential for position reporting and real-time tracking.
• Improved response time for remote station control – Useful for operators managing radios over the internet.
• Seamless VoIP communications – For applications like EchoLink and D-STAR over IP.
• Optimized FT8 and Winlink operations – Faster lookup times enhance data transfer efficiency.

DNS Speed Test Results: Finding the Fastest DNS for Your Station

We recently ran a DNS benchmark test, and here are the top-performing servers based on speed and reliability:

From this test, Cloudflare (1.1.1.1) stands out as the fastest option, delivering the lowest latency and best overall performance. If privacy is a concern, NextDNS and Quad9 offer enhanced security features while maintaining competitive speeds.

How to Change Your DNS Settings

Switching to a faster DNS server is straightforward. Here’s how you can do it:

On Windows:

1. Open Control Panel > Network and Internet > Network and Sharing Center.
2. Click Change adapter settings.
3. Right-click on your active connection and select Properties.
4. Select Internet Protocol Version 4 (TCP/IPv4) > Click Properties.
5. Choose Use the following DNS server addresses and enter:
   • Preferred DNS server: 1.1.1.1 (Cloudflare)
   • Alternate DNS server: 9.9.9.9 (Quad9)
6. Click OK and restart your connection.

On Linux (Debian-based):

1. Edit the resolv.conf file:
   sudo nano /etc/resolv.conf
2. Add the following lines: nameserver 1.1.1.1 # Cloudflare nameserver 9.9.9.9 # Quad9
3. Save and restart the network service: sudo systemctl restart networking

On Your Router:

Most routers allow you to change DNS settings in their Admin Panel under the WAN or Internet Settings section.

Final Thoughts: Optimize Your Ham Radio Internet Experience

A reliable and fast DNS server can make a significant difference in your amateur radio operations. Whether you’re tracking APRS packets, checking propagation conditions, or operating a remote station, optimizing your DNS settings ensures minimal delay and smooth performance.

Try running a DNS Speed Test Benchmark today and select the best DNS server for your needs. Your radio operations will thank you!

Did You Find This Useful?

If this guide helped improve your internet performance, consider sharing it with fellow amateur radio operators. Every millisecond counts when it comes to seamless digital communications!

Visit https://dnsspeedtest.online/

The post Boost Your Amateur Radio Internet Performance with the Fastest DNS Server appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Android car players have become increasingly popular among amateur radio operators, providing a convenient interface for various apps like APRSDroid, RepeaterBook, and EchoLink. However, not all apps are readily available on the Google Play Store for car head units. In such cases, sideloading an APK is the best solution. This guide will walk you through different methods to install APKs on your Android car player and highlight how this can benefit amateur radio enthusiasts.

Why Sideload APKs on an Android Car Player?

For amateur radio operators, an Android car player can serve as an essential tool for APRS tracking, repeater lookup, and digital communication. Sideloading APKs allows you to:

• Install APRSDroid for real-time APRS tracking and messaging.
• Use RepeaterBook to find the nearest repeaters while driving.
• Set up EchoLink for VoIP-based amateur radio communications.
• Run SDR applications for real-time spectrum analysis.

If an app is not available on your Android car player’s Play Store, sideloading is the way to go.

Method 1: Using a USB Drive or SD Card

This method is ideal for Android car players with USB or SD card support.

Steps:

1. Download the APK – On your PC or phone, get the APK file from a trusted source (e.g., APRSDroid from its official website).
2. Copy the APK to a USB Drive or SD Card – Transfer the file.
3. Insert into the Car Player – Plug the USB drive or SD card into the Android head unit.
4. Enable “Unknown Sources” – In your car player’s settings, navigate to Security > Unknown Sources and enable it.
5. Install the APK – Open the file manager, locate the APK, and tap to install.

Pros:

• Simple and does not require internet connectivity.
• Works well for large APK files.

Cons:

• Requires access to a USB drive or SD card.
• Some car head units may block installations from external storage.

Method 2: Wireless Transfer via ADB (No USB Required)

For those who prefer a wireless approach, ADB (Android Debug Bridge) allows APK installation via a smartphone.

Steps:

1. Enable Developer Options & ADB Debugging
   • Go to Settings > About Device and tap Build Number multiple times until Developer Mode is enabled.
   • In Developer Options, enable USB Debugging and Wireless Debugging (if available).
2. Install an ADB Client on Your Phone
   • Download LADB – Local ADB Shell from Google Play on your phone.
3. Transfer and Install the APK
   • Move the APK to your phone.
   • Open LADB and use the command: adb install /path/to/apk
   • Replace /path/to/apk with the actual file location.

Pros:

• No need for USB or SD card.
• Works well for advanced users.

Cons:

• Requires some knowledge of ADB commands.
• Developer mode must be enabled.

Method 3: Using “Send Files to TV” App (Easy Wireless Transfer)

Another convenient way to sideload APKs is by using the “Send Files to TV” (SFTV) app.

Steps:

1. Install Send Files to TV on both your phone and car player from the Play Store.
2. Open the app and select Send on your phone and Receive on the car player.
3. Choose the APK file and send it to the car player.
4. Open the file manager on the car player and tap the APK to install it.

Pros:

• Very user-friendly and requires no technical knowledge.
• No cables or external storage required.

Cons:

• Requires both devices to be on the same Wi-Fi network.
• Requires initial Play Store access to install SFTV.

Method 4: Direct Download & Install

If your car player has a web browser, you can download the APK directly.

Steps:

1. Open the browser on your Android car player.
2. Visit a trusted APK website (e.g., the official APRSDroid page).
3. Download the APK and install it.

Pros:

• Fast and convenient if internet access is available.

Cons:

• Some car players may block direct APK installations.
• Risk of downloading malware from untrusted sources.

Final Thoughts

For amateur radio operators, sideloading apps like APRSDroid onto an Android car player enhances mobile ham radio operations, offering real-time APRS tracking and digital communication tools while on the go. By using one of the methods above, you can install any necessary amateur radio apps, even if they are unavailable on the Play Store.

Do you use APRSDroid or other ham radio apps on your Android car player? Let us know your experience in the comments!

The post How to Sideload APKs to an Android Car Player for Amateur Radio Applications appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.