If you’ve ever been involved in emergency communications, public service events, or even casual ham radio APRS tracking, you’ve likely searched for software that’s reliable, offline-capable, and easy to use. PinPoint might be exactly what you’re looking for.

Developed by Frank, AB0WV, PinPoint is a free, Windows-based APRS application that has been battle-tested by ARES volunteers in real-world field scenarios — from weather spotter deployments to emergency exercises. While many APRS tools exist, PinPoint stands out for its combination of simplicity, capability, and field-readiness.

What Is PinPoint?

At its core, PinPoint is a visual APRS tracking and communication tool designed for ham radio operators. It allows you to see the real-time location of stations (and objects) on a map, whether you’re using a TNC and radio or just listening in on APRS-IS.

But PinPoint is more than just dots on a screen. It’s a tactical tool for field operations. Imagine a storm spotter network where the incident commander can track every mobile unit’s position and guide them safely around bad weather — that’s the kind of use case PinPoint excels at.

Why Hams Like It

Here are a few reasons why PinPoint has been well-received by the amateur radio community:

• Modern, clean interface
• Built-in map support (Google, Bing, OpenStreetMap, etc.)
• Offline-capable – Maps are cached and stored locally
• Supports a wide range of TNCs and soundmodems
• No Internet required during operations
• Free for personal use

It was even featured in the September 2018 issue of QST magazine, which says a lot about its credibility.

Features That Matter

PinPoint includes some thoughtful features that are rare in other APRS clients:

• Flexible mapping: From street maps to satellite imagery — all cached for offline use.
• Mouse-friendly UI: Most actions can be done with a click — no arcane config files or obscure hotkeys.
• Tactical awareness tools: Designed with real-world deployments in mind.
• Built-in APRS-IS support for iGate (receive-only).
• Modular and straightforward setup, especially for new users.

It’s clear that the author designed this with usability in mind, without sacrificing the serious features needed for actual field use.

What You’ll Need

To get PinPoint up and running, you’ll need:

• A Windows machine (Windows 7 to 11 recommended)
• .NET Framework 4.7.2 installed
• A radio + TNC setup (or soundmodem like DireWolf or VARA)
• A GPS if you’re going mobile
• APRS-IS access if you’re operating online
• And, of course, a valid amateur radio license

Ideal For…

• ARES and RACES deployments
• Severe weather spotting teams
• Mobile APRS tracking in vehicles
• Field Day and public service events
• Any ham who wants a clean, offline-friendly APRS solution

Still in Active Development

What’s impressive is that PinPoint is still actively maintained. If you have feedback or suggestions, you can reach out directly to the author via email. Frank listens to the community, and features are added based on actual user needs. It’s refreshing to see a ham radio app that doesn’t feel abandoned.

Final Thoughts

There’s a lot to like about PinPoint. It strikes a balance between powerful features and user-friendliness. And for emergency communications, where tools need to work without Internet, PinPoint delivers. It’s free, reliable, and tailored to the kinds of real-world challenges hams actually face in the field.

If you’re a Windows user and looking for an APRS tool that’s more than just a viewer, give PinPoint a try.

Download PinPoint here

The post A Look at PinPoint APRS: Field-Tested, Feature-Packed, and Free appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

If you’re an amateur radio operator dabbling with APRS (Automatic Packet Reporting System), you’ve probably heard of software like Xastir or APRSISCE. But there’s another powerful, under-the-radar option out there: YAAC, short for Yet Another APRS Client.

Developed by Andrew Pavlin, KA2DDO, YAAC is a cross-platform APRS client written in Java. It’s free, open-source, and remarkably feature-rich. Whether you’re trying to track APRS packets from the Internet or your TNC, set up an I-Gate, or experiment with plugins and telemetry — YAAC can handle it all.

Why YAAC?

YAAC isn’t just another APRS visualizer. It’s a full-fledged APRS client that runs on Windows, Linux, macOS, Raspberry Pi, and even FreeBSD. The UI is simple but functional, and there’s extensive documentation to help you get started. What really sets YAAC apart is its modular design and extensibility. You can write plugins or use existing ones to integrate features like:

• Weather overlays
• Aircraft tracking via ADS-B
• Callsign database lookup
• Secure authentication over APRS
• AREDN mesh object mapping
• Repeater finder
• Integration with TAK networks (yes, you can bridge data to ATAK/iTAK!)

Key Features

• Multiple map views using OpenStreetMap, with offline support
• Operates as a standalone client, digipeater, or Internet gateway
• Connects via TNCs (Kenwood, TinyTrak, Mobilinkd, etc.) or soundmodems (DireWolf, UZ7HO)
• Full support for APRS-IS, including secure SSL-based login (experimental)
• GPS and weather station integration
• Can be automated, extended, and used headless for lightweight setups

Runs Anywhere – Even on Raspberry Pi

YAAC is a solid option for low-power or portable use. It works well on Raspberry Pi models 2, 3, and 4, and has specific guidance for installation on Pi OS. If you’re setting up a field APRS tracker or a compact I-Gate node, this is worth a look.

Installation is as simple as downloading the .zip, unzipping it, and launching with:

java -jar YAAC.jar

Just make sure you’re running Java 8 or later with GUI (not headless-only).

Plugin Ecosystem

YAAC includes a surprisingly rich plugin environment. Some of the coolest plugins I found:

• takplugin: allows YAAC to interface with ATAK/iTAK – useful for tactical teams or SAR
• soundsplugin: enables event-triggered speech alerts
• telemetryalarmplugin: monitor APRS telemetry and trigger warnings
• dynamicobjectsplugin: create moving APRS objects based on GPX tracks

You can install them directly from the app under Help → Install Plugins.

What’s the Catch?

YAAC is written in Java, and while it works well, the interface is a bit old-school compared to modern UI expectations. It also doesn’t run on Android (yet), since it relies on AWT and Swing for its graphics. But if you’re comfortable with a traditional desktop-style interface, you’ll find it reliable and flexible.

It might take some initial setup — especially for configuring TNCs or APRS-IS connections — but once it’s running, it’s rock solid.

Final Thoughts

YAAC is one of those hidden gems in the ham radio software world. It’s open, active, and made with care by someone who clearly understands the needs of operators. Whether you’re just listening to APRS traffic or building a more complex setup (digipeater, I-Gate, or telemetry station), YAAC is up to the task.

Give it a try. Unzip it, configure your port, and get on the air.
And if you’re a developer, jump in and write a plugin — the community could use more contributors.

Download YAAC here

The post Exploring YAAC: A Powerful Open-Source APRS Tool for Hams appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Amateur radio enthusiasts have long been using APRS (Automatic Packet Reporting System) to track mobile stations, send messages, and share telemetry over RF and the internet. Traditionally, building an APRS tracker has required a fair bit of wiring, configuration, and standalone software installation. However, thanks to the work of the open source community—particularly the sdr-enthusiasts/docker-aprs-tracker project—it’s now possible to deploy a self-contained APRS tracker inside a Docker container.

This raises an interesting question: could we build a compact, mobile APRS tracker using a Raspberry Pi and this containerized setup? While I haven’t personally tested this combination yet, I believe the idea holds real promise and is worth exploring.

The Project: docker-aprs-tracker

The docker-aprs-tracker project packages Direwolf (a software TNC), GPSD (for GPS data input), and Chrony (for system time synchronization) into a Docker container. It’s designed to be run on a minimal Linux environment and supports ARM architectures, including Raspberry Pi models (such as the 3B+, 4B, and even some alternatives like LePotato). This makes it an ideal candidate for Raspberry Pi deployments.

Why Raspberry Pi?

The Raspberry Pi is a perfect fit for this kind of project due to its low power consumption, small size, and ARM64 compatibility. When paired with a USB GPS module, a USB sound card, and a Baofeng radio (or any HT that supports audio input/output), it has the potential to become a fully functional APRS tracker with digipeater capability.

Here’s the rough concept:

• Raspberry Pi (DietPi or Raspberry Pi OS Lite): Lightweight Linux OS, running headless.
• USB GPS module: Feeds GPS coordinates to the container via GPSD.
• USB sound card: Acts as the audio interface to the radio.
• Baofeng UV-5R: Transmits and receives APRS signals.
• Direwolf inside Docker: Handles AX.25 packet encoding/decoding and beaconing.

Key Advantages

• Portability: Everything runs on a Pi, powered by USB or battery.
• Simplicity: Containerized deployment reduces the mess of dependencies.
• Modularity: You can easily swap out hardware components.
• Maintainability: Configuration is stored in a version-controlled docker-compose.yml.

Points to Consider

This project is still under active development, and the container is described as “low maturity,” meaning bugs and frequent changes should be expected. For experimental or personal use, this isn’t a deal-breaker. In fact, it can be a great learning opportunity.

Also, tuning the audio interface can be tricky—especially if you’re using a VOX-based cable like the BTech APRS-K1. The creator of the project recommends a CM108-based USB sound card with built-in PTT support for more reliable transmission. There’s even mention of pre-built options from na6d.com that combine everything in a compact form.

Final Thoughts

While I haven’t built this setup yet, the combination of Docker, Direwolf, and Raspberry Pi opens the door for a lightweight, portable APRS tracker that could be deployed in a vehicle, on a hiking trip, or even at a public service event. It’s an idea I believe many radio amateurs will find interesting—especially those already comfortable working with Raspberry Pi and containerized applications.

If you’re looking for your next ham radio project, this might just be it. And if you do build it, I’d love to hear how it works out for you. Visit and learn more at https://github.com/sdr-enthusiasts/docker-aprs-tracker

The post Building an APRS Tracker with Raspberry Pi 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.

If you’ve explored LoRa APRS, you’re likely familiar with the challenges: cumbersome interfaces, overly complex apps that try to do too much, and tools that often overlook the real needs of amateur radio operators — clear and reliable messaging over LoRa. Introducing the LoRa APRS Mobile App by SQ2CPA — a fresh approach that eliminates unnecessary features and focuses on what truly matters.

Built by Hams, For Hams

This app isn’t just another APRS clone. It’s designed with real amateur radio operators in mind. That means no unnecessary junk. Just rock-solid messaging that works whether you’re in the shack or in the field.

• Pure messaging with KISS TNC over Bluetooth
• Smart routing feedback: direct RF or TCP/IP
• Instant connection to your LoRa hardware
• Zero config headaches

Plug In and Go: Device Connectivity

You are not limited to one board or brand. This app is compatible with Bluetooth Low Energy (BLE) and Bluetooth Classic devices — just ensure your LoRa APRS device supports the KISS TNC protocol, and you are set to go.

Smart Station Awareness

No more guessing which stations can receive your messages. The app automatically detects and labels message-capable stations, so you don’t waste time yelling into the void.

• Tap to message
• See recent contacts only
• Know when you last RX/TX
• Live grid square display

Settings That Make Sense

Forget endless dropdowns or obscure toggles. Whether you’re adjusting device connections, screen behavior, or TNC routing — everything’s where it should be.

• Clean UI
• Live device status
• Auto background operation

Station Intel & Debug Tools

You’re not just seeing callsigns — you’re getting full telemetry and weather data, smart protocol routing insights, and detailed message delivery tracking.

• Battery voltage, solar input, trends
• Weather (temp, wind, rain, baro)
• Raw frame decoding
• Message retries, history, and routing clarity

Messaging Like a Pro

• Threaded chat layout
• Unread badges
• Delivery status (via RF or TCP/IP)
• Saved templates for quick sends
• Built-in callsign checker

Live Map: See Your APRS World

The built-in map isn’t just eye-candy. It shows live LoRa APRS station coverage, updates in real-time, and helps you understand RF propagation at a glance.

• Zoom & filter stations
• Live updates of who’s on the air
• Tap stations for full info

Ready to Try It?

• Download the Beta APK for Android
• iOS version coming soon
• Frequent updates from an active ham developer
• Built by SQ2CPA

The post SQ2CPA LoRa APRS Mobile App appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Important: WoAD is only for users with a valid amateur radio license. Do not download or use it unless you’re properly licensed. Ship station, marine, or general radiotelephone licenses are not accepted.

WoAD connects to the Winlink Global Radio Email® system and also supports peer-to-peer (P2P) messaging, either over the internet or via radio.

Supported Protocols and Interfaces

Telnet – Fastest option if you have internet access
Packet – Classic Winlink transport via KISS TNC
AFSK 1200 bps / 300 bps – Audio tones via soundcards like SignaLink or digirig
FSK 9600 bps – Higher-speed audio option
PTT control – Works via USB RTS, CM108 GPIO, or tone-activated
USB support – Radios like Kenwood TH-D72/74 and TM-D710 supported
Bluetooth – Connects to devices like Mobilinkd TNC
Bluetooth Low Energy (BLE) – For modern low-power devices
TCP/IP – Works with software TNCs like Dire Wolf
ARDOP – Modern, efficient digital mode
VARA HF and VARA FM – High-speed, robust modes for HF and VHF/UHF over TCP/IP

Whether you’re involved in emergency communications, portable operations, or just experimenting with radio email, WoAD is a lightweight, modern solution that puts digital comms in your pocket.

Developed by Sumus Technology Limited, WoAD continues to grow with the amateur radio community in mind.

Visit https://woad.sumusltd.com/

The post WoAD – Winlink Client on Your Android: Seamless Radio Email for Hams appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Winlink is an essential tool in emergency and portable amateur radio communications. It allows you to send and receive emails over RF using various modes like VHF, UHF, and HF. In this guide, I’ll walk you through setting up a Winlink client on a Raspberry Pi, turning your Pi into a lightweight and powerful messaging hub.

Whether you’re preparing for EmComm scenarios or operating in remote areas, this setup gives you email access without the internet.

What You’ll Need

• Raspberry Pi 3, 4, or Zero 2 W (running Raspberry Pi OS or Debian-based Linux)
• Internet access for installation
• Your amateur radio license
• A soundcard interface (e.g., Signalink, Digirig, or USB soundcard)
• A transceiver (VHF/UHF or HF)
• A Winlink account (free to register on first connect)

Optional but useful:

• USB GPS (for mobile use)
• Touchscreen or headless SSH setup

Step 1: Install Dependencies

First, update your Pi:

sudo apt update && sudo apt upgrade -y

Install required packages:

sudo apt install build-essential git cmake libhamlib-dev libwxgtk3.0-gtk3-dev libconfig++-dev libfftw3-dev libpulse-dev libusb-1.0-0-dev libudev-dev libasound2-dev

Step 2: Install pat — the Winlink Client

pat is a cross-platform Winlink client written in Go, ideal for headless or GUI-less systems like the Raspberry Pi.

Install Go (if not installed):

sudo apt install golang-go

Clone and build pat:

cd ~
git clone https://github.com/la5nta/pat.git
cd pat
go build
sudo cp pat /usr/local/bin/

Verify:

pat version

Step 3: Configure pat

Create config directory:

mkdir -p ~/.config/pat
nano ~/.config/pat/config.json

Paste and edit this basic configuration:

{
  "mycall": "9M2PJU",
  "secure_login_password": "your_winlink_password",
  "locator": "OJ03pa",
  "listen": ["http"],
  "http_addr": "0.0.0.0:8080"
}

Replace 9M2PJU with your callsign, and set your password. The locator can be your Maidenhead grid square.

Step 4: Connect Radio & Sound Interface

Connect your USB soundcard interface to the Pi and your transceiver. Make sure audio in/out is working (check with arecord and aplay).

Optional: Configure audio devices in ~/.asoundrc or set defaults with alsamixer.

Step 5: Install ardop or ax25 Modem

Install ARDOP (for VHF/UHF or HF soundcard modes)

Clone and build:

cd ~
git clone https://github.com/la5nta/ardop.git
cd ardop
go build
sudo cp ardop /usr/local/bin/

Step 6: Launch pat Web Interface

Run the client:

pat http

On your browser, navigate to:

http://<raspberrypi-ip>:8080

You’ll see the Winlink pat interface. You can compose messages, connect to gateways, and send emails over RF.

Step 7: Send and Receive Messages

To send a message:

1. Click Compose
2. Enter recipient (e.g., yourname@winlink.org)
3. Choose Winlink CMS Relay for direct messages or Packet/ARDOP for RF
4. Click Send

To send via RF (Packet or ARDOP), you’ll need to set up modems and gateway frequencies. Example (packet mode):

pat connect ax25 KLSAR-10

Or ARDOP:

pat connect ardop K4CJX

Tips and Tricks

• Use tmux or screen to keep pat running in the background
• Install ax25-tools if using hardware TNC
• Use direwolf for software packet TNC (AX.25 mode)
• Set up a cronjob to auto-launch on boot

Security Note

The web interface doesn’t use SSL by default. If you’re exposing this over a network, consider using SSH tunneling or a reverse proxy with HTTPS.

Final Thoughts

With just a Raspberry Pi and some ham radio gear, you now have a fully functional Winlink station capable of handling email over RF. This setup is portable, reliable, and an excellent asset for both casual and emergency use.

The post How to Set Up a Winlink Client on a Raspberry Pi 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.

Introducing RadioMail 1.5 – The “Robust Packet Radio” Release

RadioMail is a modern Winlink client designed for iOS, providing an intuitive and visually appealing way to send and receive messages over the Winlink network. Whether you’re deep in the wilderness or responding to an emergency, RadioMail ensures you stay in touch when the internet isn’t available.

Why RadioMail?

• Send & Receive Emails via Winlink – Exchange messages with Winlink users and regular email addresses.
• Optimized Mobile Experience – Enjoy a polished and user-friendly interface designed for iPhone.
• Global Connectivity – Access Winlink gateways worldwide for email and position reporting.
• Emergency & Disaster Ready – Trusted by emergency responders for reliable off-grid communication.

A valid amateur radio license is required to use RadioMail.

Powerful Features

Station Directory – Automatically retrieves station info from Winlink, sorted by proximity.

Favorites List – Save frequently used stations for quick access by mode and band.

Winlink Forms – Fill and submit over 100 standard forms with auto-filled GPS coordinates.

TNC & Modem Support – Works with B.B. Link, Mobilinkd TNC, DigiRig, and VARA modems.

Built-in Packet Modem – 1200 baud AFSK modem support with compatible audio interfaces.

Digipeater Support – Extend your range with up to two digipeaters.

Camera & Attachments – Capture and send images, annotate files, and share PDFs.

APRS Integration – Send position reports directly to the APRS network.

Push Notifications – Get real-time alerts when new messages arrive.

Flexible Addressing – Send emails with tactical addresses or secondary accounts.

Meet B.B. Link – Seamless Connection for Kenwood TH-D75 & TH-D74

The B.B. Link adapter is a game-changer for Kenwood radio users, allowing iPhones and iPads to interface directly with the built-in KISS TNC on the TH-D75 and TH-D74. No more complicated setups—just plug in the adapter, turn on your radio, and start sending emails over Winlink.

Compatibility

Supported Client Applications:

• Winlink Express
• Pat
• WoAD

Works with These Gateways:

• RMS Packet
• RMS Trimode
• BPQ32

Compatible Radios:

• Kenwood TH-D74 / TH-D75 (Requires B.B. Link Bluetooth adapter)
• BTECH UV-PRO
• VERO VR-N76
• RADIODDITY GA-5WB
• PicoAPRS V4

Modem & TNC Support:

• B.B. Link Adapter (for TH-D74/TH-D75)
• Mobilinkd TNC3 / TNC4
• LiNK500 TNC (Robust Packet)
• Dire Wolf & Soundmodem software TNC
• VARA FM & VARA HF software modems

What Operators Are Saying

“RadioMail is a gorgeous app allowing us Winlink connections on the iPhone. Compatible with the Mobilinkd TNC, Dire Wolf, VARA FM, and VARA HF.”
— Jason KM4ACK

“My new favorite ham radio app is RadioMail. Since I always have my iPhone on me, I can take a small radio pouch and retrieve my Winlink emails on the go! Great job!”
— Josh KI6NAZ (Ham Radio Crash Course)

Get Started Today!

Download RadioMail on the App Store (4.8 rating) Get the B.B. Link Adapter for your Kenwood TH-D75/TH-D74

Stay connected wherever you go with RadioMail and B.B. Link—the ultimate Winlink solution for iOS users. Visit https://radiomail.app/

The post Stay Connected Anywhere: RadioMail & B.B. Link for Kenwood TH-D75 appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Are you looking for the ultimate digital radio cross patch to enhance your amateur radio experience? The Nexus DR-X, also known as DigiLink, is the Swiss Army Knife of digital radio connections. Whether you’re running Packet Radio with Direwolf, decoding signals with WSJT-X, or experimenting with Fldigi, the DR-X provides a seamless connection between your Raspberry Pi and nearly any transceiver.

Seamless Connectivity

The Nexus DR-X offers multiple connection options, making it incredibly versatile for different setups. With two audio jacks for TX and RX audio and four connection types, you can easily integrate the DR-X with a wide range of radios:

• RJ-45 with a 16-pin jumper header – Compatible with popular sound card interfaces.
• TRRS jack – Connects with off-the-shelf cables for radios supporting mic, speaker, and PTT headsets.
• Two 6-pin Mini DIN connectors – Ideal for VHF/UHF and HF radios.

This flexibility ensures that no matter your setup, the DR-X has you covered.

Powerful and Easy to Use

The DR-X kit includes a fully assembled DC-DC buck converter, which takes 7-38V input and delivers a stable 5V output. This means you can power your entire setup, including the Raspberry Pi, sound card, and DR-X, with a single power source. The board also provides 5V and 3.3V output pins, giving you even more options for expansion.

To keep your system running accurately even when offline, the kit includes an RTC module, ensuring that your Raspberry Pi maintains accurate time without an internet connection.

Run Two Radios Simultaneously

One of the standout features of the Nexus DR-X is its ability to support two radios at once. With the provided Buster Raspberry Pi image, you can operate multiple digital modes simultaneously. Imagine running FT-8 on HF while simultaneously using FSQ on VHF, or running Direwolf for APRS while decoding MT-63 on another band. The possibilities are endless!

Perfect for Clubs and Group Builds

Looking for a fantastic project for your amateur radio club? The DR-X kit is designed for group builds, making it an excellent choice for club activities. When ordering five or more kits, you receive an extra contingency kit for spare parts. If any components are misplaced during assembly, you can use the extra parts, and the manufacturer will replace them (just cover the shipping). This ensures that your club ends up with an extra unit as a bonus!

Affordable and Accessible

The Nexus DR-X kit is priced at just $49, including shipping within the U.S. If you prefer to source your own components, you can purchase the PCB alone for $14. Bulk orders are also available upon request.

Due to high demand, all units in the current batch have been reserved. Secure your spot for the next batch by placing a reservation today!

Final Thoughts

If you’re a digital radio enthusiast looking for a reliable, flexible, and powerful cross patch for your setup, the Nexus DR-X is a game-changer. With its extensive connectivity options, dual-radio capability, and easy-to-use Raspberry Pi integration, it’s the perfect tool to take your amateur radio operations to the next level.

Visit https://wb7fhc.com/nexus-dr-x.html

The post Unlock the Power of Digital Radio with the Nexus DR-X (DigiLink) appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

Introduction

Imagine turning your Android phone into a fully functional Amateur Radio HF/VHF/UHF APRS-enabled digital voice (DV) transceiver. With Codec2 Talkie, this is now a reality. This innovative app enables Codec2 and OPUS voice communication over KISS, APRS UI frames, and FreeDV modes, transforming your phone into a powerful digital communication tool for amateur radio operators.

About Codec2 Talkie

codec2_talkie is an advanced Android application that supports digital voice communication using the open-source Codec2 and OPUS codecs. It facilitates seamless integration with radio modems, allowing for effective voice and data transmission over amateur radio bands. Whether you’re using LoRa, AFSK, or FreeDV, this app is designed to work with a variety of modems and transceivers, making it an ideal solution for ham radio enthusiasts.

Key Features

Voice Communication

• Send and receive Codec2 voice over FreeDV modes.
• Transmit and receive Codec2/OPUS voice over KISS.
• Encapsulate Codec2/OPUS voice into APRS UI frames for transmission.

Data Communication

• Support for APRS over various modulation schemes:
  • FSK 300 (HF, TX only)
  • AFSK1200 (VHF)
  • FreeDV OFDM (HF)
  • APRS-IS (Internet)
• Send and receive APRS position reports and messages.
• Maintain an APRS log with raw data.
• View APRS station information on a map.
• Act as an APRS digipeater and an APRS-IS RX/TX iGate.
• Enable APRS-IS internet tracking for APRS data over the Internet.
• Send and receive LoRa-APRS text packets over KISS.

Hardware and Software Integration

• Works with Bluetooth/BLE/USB/TCPIP KISS hardware modems, including LoRa, FSK, AFSK, etc.
• Supports KISS software modems like Direwolf.
• Can function as a sound modem using an external USB OTG audio adapter or the phone’s built-in mic and speaker.
• Compatible with FreeDV protocol voice communication over HF transceivers.
• Controls external transceiver PTT using USB serial CAT (or VOX if CAT PTT is unavailable).

Requirements

To use codec2_talkie, you need:

• Android 7.0 (API 24) or higher.
• A KISS protocol-supported modem or transceiver that processes Codec2 audio frames over serial Bluetooth, BLE, USB, or TCP/IP.
• An analog transceiver with USB audio and VOX/USB CAT PTT control (e.g., MCHF or ICOM IC-7×00 series).

This application can also be installed on Android network radios, such as the Inrico TM-7.

Dependencies

codec2_talkie integrates several open-source components for seamless operation:

• Codec2 codec: https://github.com/drowe67/codec2
• Android Codec2 wrapper: https://github.com/UstadMobile/Codec2-Android
• OPUS codec: https://opus-codec.org
• Android USB serial library: https://github.com/mik3y/usb-serial-for-android

Related Hardware and Software Projects

Hardware

• ESP32 LoRa APRS modem: https://github.com/sh123/esp32_loraprs
• ESP32 LoRa DV transceiver: https://github.com/sh123/esp32_loradv
• Arduino Micro KISS modem: https://github.com/sh123/micro_loraprs
• ESP32 Arduino Codec2 library: https://github.com/sh123/esp32_codec2_arduino

Software

• FreeDV TNC: https://github.com/xssfox/freedv-tnc
• FreeDV data modem UI: https://github.com/DJ2LS/FreeDATA
• FreeDV GUI: https://github.com/drowe67/freedv-gui
• M17 protocol version: https://github.com/mobilinkd/m17-kiss-ht
• Codec2 iOS wrapper: https://github.com/Beartooth/codec2-ios

Conclusion

codec2_talkie is a game-changing Android application that enables amateur radio operators to experiment with digital voice communication using low-cost hardware. Whether you are using LoRa, FreeDV, AFSK, or other KISS-enabled modems, this app provides an excellent platform for voice and data exchange over APRS and other digital communication modes.

With its support for Bluetooth, BLE, USB, and TCP/IP modems, along with APRS and FreeDV capabilities, codec2_talkie is an essential tool for hams looking to explore the future of digital voice communication.

For more information about FreeDV and Codec2 visit https://github.com/drowe67/codec2

For more information about OPUS codec visit https://opus-codec.org/

For detailed information about this project https://github.com/sh123/codec2_talkie

The post Transform Your Android Phone into a Digital Voice APRS Transceiver with Codec2 Talkie appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

What is DragonOS?

DragonOS is a specialized Linux distribution designed for SDR enthusiasts, built on Lubuntu and packed with pre-installed open-source SDR software. Developed by Cema Xecuter, DragonOS aims to be for SDR what Kali Linux is for penetration testing—a comprehensive, plug-and-play environment that eliminates the hassle of setting up and configuring software from scratch.

With DragonOS, you no longer have to struggle with software dependencies, installation conflicts, or configuration headaches. Just boot it up, and you’re ready to explore the airwaves!

Why is DragonOS a Game-Changer for Amateur Radio Operators?

Amateur radio, also known as ham radio, has long been a playground for innovation. From emergency communications to satellite operations and digital modes, amateur radio operators are always at the cutting edge of wireless experimentation. DragonOS simplifies access to powerful SDR tools, allowing hams to:

• Monitor and Decode Signals – DragonOS supports tools like GQRX, SDR++, and CubicSDR, making it easy to listen to and analyze radio signals across various bands.
• Operate Digital Modes – With applications like WSJT-X, FLDigi, and Direwolf, you can engage in weak-signal communication, packet radio, and APRS (Automatic Packet Reporting System) right out of the box.
• Track and Communicate with Satellites – Use GPredict and SatNOGS to track amateur satellites and receive telemetry data.
• Experiment with RF Security – Tools such as GNU Radio, RTL_433, and HackRF utilities allow you to analyze and experiment with various wireless protocols.
• Set Up an APRS iGate or Repeater – With Direwolf and other tools, you can configure your system to receive and relay APRS packets to the global APRS-IS network.
• Decode Weather Satellites – With software like SatDump and WXtoIMG, you can receive real-time images from NOAA and Meteor satellites.

Supported SDR Hardware

DragonOS comes with built-in support for a variety of SDR devices, ensuring seamless compatibility with:

• RTL-SDR (one of the most affordable SDR receivers)
• HackRF One
• LimeSDR
• BladeRF
• Ettus USRP
• SDRPlay
• PlutoSDR
• Yardstick One
• Ubertooth
• And more!

Versatility and Ease of Use

DragonOS is designed to be flexible and user-friendly. You can run it as:

• A Live Bootable OS – Test it without installing anything.
• A Dual-Boot System – Install alongside Windows, macOS, or another Linux distribution.
• A Virtual Machine – Run it in VirtualBox or VMware for testing and development.

The pre-installed SDR tools are organized for convenience, so users of all experience levels can quickly get started. Whether you’re setting up a field station, testing antennas, or analyzing signals from the comfort of your shack, DragonOS makes it effortless.

Getting Started with DragonOS

Ready to dive into the world of SDR? Download DragonOS and follow the setup instructions at Cema Xecuter’s official website. The active community and ongoing development ensure that DragonOS remains cutting-edge, making it the go-to platform for SDR enthusiasts worldwide.

Embrace the future of radio with DragonOS—where software meets spectrum!

The post Unleashing the Power of Software Defined Radio with DragonOS appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

APRS (Automatic Packet Reporting System) is a digital communications system used by amateur radio operators for local tactical communications and position tracking. An iGate (internet gateway) receives these radio packets and relays them to the internet, contributing valuable data to the global APRS network.

This guide, originally developed by KM6LYW, demonstrates how to build a receive-only APRS iGate using affordable components. For just $99, one can create a system that displays real-time APRS traffic including text messages, weather reports, beacons, positions, and object information.

Why Build an APRS iGate?

1. The APRS network benefits from more iGates to improve coverage
2. It’s an educational project combining radio, computing, and networking
3. Visualizing local APRS traffic in real-time is informative
4. It’s an affordable entry point into digital amateur radio

Parts List ($99 Total)

• $18 – Raspberry Pi Zero 2 W with headers (Adafruit)
• $4 – USB adapter cable (Amazon)
• $31 – RTL-SDR software defined radio (Amazon)
• $32 – Roll-up antenna (eBay)
• $14 – LCD Display (Amazon)

Software Installation

Update the Raspberry Pi and install the necessary packages:

sudo apt-get update
sudo apt-get install direwolf rtl-sdr git python3-pip fonts-dejavu python3-pil python3-pyinotify python3-numpy
sudo pip3 install --break-system-packages adafruit-circuitpython-rgb-display
sudo pip3 install --break-system-packages aprslib
git clone https://github.com/craigerl/direwatch...

Configuration

1. Enable SPI by editing the configuration file:

sudo nano /boot/firmware/config.txt
# Uncomment the spi line:
# dtparam=spi=on

2. Reboot the Raspberry Pi to apply the changes.
3. Create a Direwolf configuration file:

sudo nano direwolf.conf

4. Add the following configuration, replacing NOCALL with your amateur radio callsign and updating your GPS coordinates:

MYCALL NOCALL
IGSERVER noam.aprs2.net
IGLOGIN NOCALL 12345
PBEACON sendto=IG compress=1 delay=00:15 every=30:00 symbol="igate" overlay=X lat=39.911 long=-122.935 comment="Direwatch Rx-only igate"
AGWPORT 8000
KISSPORT 8001
ADEVICE null

Launching the iGate

Navigate to the direwatch directory and run the following commands:

cd direwatch
rtl_fm -s 22050 -g 49 -f 144.39M 2> /dev/null | direwolf -t 0 -r 22050 - > direwolf.log &
./direwatch.py -o -l direwolf.log -t "APRS"

Note: The standard APRS frequency in North America is 144.39MHz. This frequency may need to be adjusted depending on region.

What’s Happening?

1. The RTL-SDR receives radio signals on the APRS frequency
2. Direwolf decodes the APRS packets and logs them
3. The direwatch script displays the decoded information on the LCD screen
4. Packets are simultaneously relayed to the APRS-IS network via the internet

This iGate is now operational, contributing to the global APRS network while providing a real-time display of local APRS traffic.

Final Notes

This project, designed by KM6LYW, serves as an introduction to digital amateur radio and the APRS ecosystem. Building more iGates improves the network for everyone, and the visual feedback makes it an engaging project even for beginners.

For more detailed instructions and additional configuration options, visit the Direwatch GitHub repository.

(Note: An amateur radio license is required to legally transmit on these frequencies)

The post Building a $99 APRS Packet iGate in Under 10 Minutes appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

If you’re an amateur radio operator looking for an affordable, versatile, and hackable interface for your radios, the Ham Radio All-in-One Cable (AIOC) is the perfect solution! Currently undergoing testing, the AIOC combines multiple functions in a compact and easy-to-use USB-C adapter. Whether you need to interface with your radio for APRS, programming, or Push-To-Talk (PTT) control, the AIOC has you covered.

What is the AIOC?

The AIOC is an innovative all-in-one cable that serves as:

• A sound-card interface for APRS and digital modes
• A virtual COM port for radio programming and PTT assertion
• A CM108-compatible PTT interface for software like Direwolf, enabling seamless integration with popular modes and applications

It’s based on the easy-to-hack STM32F302 microcontroller and comes with a customizable firmware that allows for a variety of useful configurations. Whether you’re an experienced DIYer or just getting started with digital modes, the AIOC provides a flexible platform for exploration.

Key Features:

• Affordable & Hackable: A cost-effective solution for digital mode interfaces, similar to Digirig or Mobilinkd.
• Dual PTT Support: Easily control two radios or use your AIOC for different radio projects.
• Compact Form Factor: A small, easy-to-use interface that can be modified or customized for specific use cases.
• Cross-Platform Compatibility: Works with Linux, Windows, and macOS (with some limitations).
• Wide Software Compatibility: Supports popular software like Direwolf, AllStarLink, APRSdroid, CHIRP, and VaraFM.

Tested Radios:

The AIOC has been successfully tested with several radios including:

• Wouxun UV-9D Mate
• Baofeng UV-5R
• BTECH 6X2
• Quansheng UV-K5

…and many more!

How to Build and Assemble the AIOC:

Building your own AIOC is simple! With the included Gerber files, you can easily order a custom PCB and have it assembled. If you’re more into hands-on work, you can solder the necessary components like the TRS connectors to complete the build.

For those who prefer ready-made solutions, the assembly process is straightforward, and a 3D-printed case is available for a neat and sturdy final product.

Firmware and Updates:

The AIOC is powered by the STM32F302 MCU, which is programmable via USB using the DFU bootloader. Firmware updates are easy to apply, and the latest version (1.2.0) adds support for external hardware input, adjustable audio levels, and a CM108-style PTT interface for even more features.

How to Use the AIOC:

Once programmed, the AIOC acts as a COM port (Windows) or ttyACM port (Linux) for programming your radio and controlling PTT via standard serial commands. The soundcard interface supports multiple baud rates (including 48000 Hz, 32000 Hz, 24000 Hz, and more), making it ideal for APRS and other digital modes.

With the new CM108-compatible PTT interface (available in firmware 1.2.0), you can use your AIOC with Direwolf and other software that support CM108-style PTT, providing even more flexibility.

Software Compatibility:

• Direwolf: Use the AIOC as an AX.25 modem/APRS encoder/decoder.
• AllStarLink (ASL3): Set up an AllStarLink node with your handheld radio and the AIOC.
• APRSdroid: Supports APRSdroid with the fixed 22050 Hz sample rate (ideal for APRS).
• CHIRP: Easily program your radio with CHIRP, just like with a regular programming cable.
• VaraFM: Use the AIOC for PTT control while operating with VaraFM.

Known Issues:

While the AIOC performs excellently with most radios and software, there are a few known issues with electromagnetic interference (EMI) when using a handheld radio with a monopole antenna. This can be mitigated with ferrite cores or by isolating certain wires between the radio and AIOC.

Future Updates and Features:

The development team is actively working on several exciting new features for the AIOC:

• Configurable Settings: A Python script will allow you to change settings like PTT assertion or USB VID:PID, making the AIOC even more customizable.
• Virtual PTT & COS: Future updates will allow the AIOC to automatically assert PTT when it receives TX data or notify your PC of audio activity via CM108 emulation.

Why Choose the AIOC?

If you’re looking for an affordable, flexible, and customizable solution to enhance your amateur radio setup, the AIOC is a game-changer. It supports a wide range of radios and software, and its open-source nature means you can hack and modify it to suit your specific needs.

To learn more about the AIOC or to get started on your own project, visit the official AIOC GitHub Repository for documentation, firmware, and more.

The post Introducing the Ham Radio All-in-One Cable (AIOC): The Ultimate Multi-Purpose Interface for Your Radios! appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.

What is the 9M2PJU APRS Passcode Generator?

The 9M2PJU APRS Passcode Generator is a simple and efficient online tool that helps amateur radio operators obtain their APRS-IS passcode instantly. Hosted at https://passcode.infy.uk/, this service eliminates the need for users to manually compute their passcode using complex algorithms.

Why Do You Need an APRS Passcode?

APRS-IS requires a passcode to prevent unauthorized access and misuse of the network. Since APRS data is transmitted over RF and the internet, restricting access to licensed operators ensures data integrity and security. While the passcode is not an encryption method, it serves as a verification mechanism to confirm that the user holds a valid amateur radio license.

Features of the 9M2PJU APRS Passcode Generator

1. Instant Passcode Generation – Enter your callsign, and the system provides your APRS-IS passcode immediately.
2. User-Friendly Interface – The website is designed to be simple and efficient, ensuring a seamless experience.
3. No Registration Required – Unlike some services, there’s no need to sign up or provide personal details.
4. Open and Free to Use – The tool is accessible to all amateur radio operators at no cost.

How to Use the Passcode Generator

Using the 9M2PJU APRS Passcode Generator is straightforward:

1. Open the website: https://passcode.infy.uk/
2. Enter your valid amateur radio callsign in the provided field.
3. Click the Generate button.
4. Your APRS-IS passcode will be displayed instantly.

Who Can Use This Tool?

This generator is useful for any amateur radio operator looking to set up APRS software such as:

• APRSISCE/32
• Xastir
• Direwolf
• YAAC (Yet Another APRS Client)
• APRS Droid (for Android users)

New users setting up APRS for the first time often face difficulties obtaining a passcode, and this tool provides a quick solution.

Security and Ethical Considerations

It’s important to remember that APRS passcodes are linked to specific callsigns. While the algorithm for generating them is well-known, it is the responsibility of every user to ensure they are authorized to use the callsign entered.

Final Thoughts

The 9M2PJU APRS Passcode Generator at https://passcode.infy.uk/ is an excellent tool for amateur radio operators who need quick access to their APRS-IS passcode. By simplifying the process, it helps more users join the APRS network with minimal hassle. Whether you’re a seasoned operator setting up a new system or a beginner exploring APRS for the first time, this generator is a must-have resource in your toolkit.

If you find this tool helpful, consider sharing it with fellow ham radio operators to support the growing APRS community. Happy APRS-ing!

The post APRS Passcode Generator https://passcode.infy.uk appeared on Hamradio.my - Amateur Radio, Tech Insights and Product Reviews by 9M2PJU.