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electromagnetic spectrum
amateur radio communication electromagnetic emergency communication frequency ham radio military radio signals intelligence wavelength

The Electromagnetic Spectrum: Understanding the Fundamentals

9M2PJU March 31, 2025

Introduction Electronic warfare (EW) involves the strategic use of the electromagnetic (EM) spectrum to gain…

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chirp spread spectrum
amateur radio chirp spread spectrum frequency shift ham radio internet of things LoRa LoRaWAN radio
9M2PJU 0 Comments

LoRa and Chirp Spread Spectrum (CSS) Modulation: How It Works

LoRa (Long Range) is a wireless communication technology that has gained significant popularity in recent…

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March 17, 2025
history internet radio
9M2PJU 0 Comments

The Evolution of Internet Radio: From Shoutcast and Winamp to Today’s Streaming Giants

The journey of internet radio is a fascinating tale of innovation, community, and technological evolution.…

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June 20, 2024
army equipment high frequency military military communications military radio navy radio tactical
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Top HF Tactical Radio Manufacturers in the World

High-frequency (HF) tactical radios are essential communication tools in modern military operations, offering reliable long-range…

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May 19, 2024
equipment military communications radio tactical
9M2PJU 0 Comments

Top Tactical Radio Manufacturers in the World

Tactical radios play a crucial role in modern military operations, providing secure and reliable communication…

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May 18, 2024
communication emergency military radio tactical telephone
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Connecting a Tactical Manpack Radio to a Traditional Telephone Line: A Step-by-Step Guide

In the world of modern communications, there are situations where you might need to bridge…

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May 18, 2024
hacking radio wireless
9M2PJU 0 Comments

Unveiling the Evil Crow RF: Your Gateway to Radiofrequency Hacking

In the realm of cybersecurity, the pursuit of innovative tools and techniques to bolster defenses…

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April 1, 2024
aviation communication flight radio
9M2PJU 0 Comments

Demystifying Aviation Radio Voice Communication: A Comprehensive Guide

In the intricate world of aviation, effective communication is paramount for safe and efficient operations.…

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March 25, 2024
communication hobby homebrew modulation radio security signal simulation software wireless
9M2PJU 0 Comments

Unlocking Wireless Secrets with the Universal Radio Hacker (URH)

In a world where wireless communication reigns supreme, understanding the intricate dance of signals that…

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March 21, 2024
hacking infrared radio technology wireless
9M2PJU 0 Comments

The Birth of MonstaTek M1

"Hello World. It was only a matter of time that the imagination of tech geeks,…

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March 19, 2024
digital history portable radio receiver technology watch
9M2PJU 0 Comments

Rediscovering Time: The Evolution of Wristwatches with Built-In AM/FM Radio

In the dynamic realm of technological evolution, innovation often surprises us by merging the traditional…

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March 18, 2024
antenna communication military radio
9M2PJU 0 Comments

Unveiling the Military Radio Antenna: History, Components, and Types

Introduction:In the world of military communication, the radio antenna stands tall as a vital component…

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March 9, 2024
communication history military radio
9M2PJU 0 Comments

The Art of War: Navigating the Battlefield Without Radio Communication

Introduction:Warfare has evolved significantly over the centuries, with technological advancements shaping the strategies and tactics…

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March 7, 2024
9M2PJU communication history military radio
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The Importance of Radio Communication in Military Operations: Unveiling the Historical Significance

Introduction: Effective communication has always been the lifeblood of successful military operations. In an era…

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March 7, 2024
9M2PJU communication history military radio
9M2PJU 0 Comments

BAOFENG Walkie Talkie: A Brief History and Its Role in the Russian-Ukrainian Conflict

Introduction: BAOFENG, a well-known brand in the world of walkie talkies, has gained popularity for…

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March 7, 2024
communication military radio tactical
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Technology in Military Tactical Radio: Advancements in the Digital Era

Introduction: In the modern digital era, military operations rely heavily on effective communication systems to…

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March 7, 2024
amateur history license malaysia radio
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Malaysian Amateur Radio License in 1997

 

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November 15, 2022
amateur history license malaysia radio
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Malaysian Amateur Radio License in 1989

 

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November 15, 2022
amatur radio
9M2PJU 0 Comments

Hobi – hobi Dalam Radio Amatur

Radio amatur adalah satu nama bagi sifat, perbuatan dan juga gelaran bagi hobi eksperimentasi teknologi…

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July 28, 2016
amatur radio
9M2PJU 0 Comments

Ilmu Dalam Radio Amatur

Ada yang bertanyakan apa kebaikan jika berkecimpung di dalam radio amatur. Satu soalan yang agak…

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July 27, 2016
amatur radio
9M2PJU 0 Comments

Integriti

Di dalam komunikasi di antara operator radio amatur, terlalu banyak mesej yang berintegriti rendah tersebar.…

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July 24, 2016
amatur radio
9M2PJU 0 Comments

Radio Amatur Dan Spanar Hidup

Masyarakat kurang didedahkan dengan apa itu maksud radio amatur yang juga dikenali sebagai ham radio.…

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July 23, 2016
amatur radio
9M2PJU 0 Comments

Hakikat Penglibatan Dalam Radio Amatur

Saya perhatikan majoriti pemula dalam dunia radio amatur sekarang bukan bermula dari shortwave listening. Kebanyakan…

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July 22, 2016
amatur radio repeater
9M2PJU 0 Comments

Repeater dan Radio Amatur

Penggunaan repeater merupakan satu aktiviti yang sering menjadi pilihan bagi mereka yang mula menceburi di…

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July 22, 2016
9M2PJU amatur malaysia radio
9M2PJU 0 Comments

Dunia Radio Amatur 9W dan 9M

Jika diperhatikan, masih ramai dikalangan radio amatur di Malaysia suka membeza-bezakan di antara kelas A…

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July 21, 2016
callsign malaya malaysia operator radio radio amatur sejarah
9M2PJU 0 Comments

Sejarah Radio Amatur Di Malaysia Melalui Kad QSL

Kad QSL merupakan salah satu medium pengesahan perhubungan atau contact bagi stesen-stesen radio amatur dari…

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July 20, 2016
amateur amatur contest cq ham malaysia radio
9M2PJU 0 Comments

9M2M CQ WW SSB Contest 2015 On Nasional 5 RTM TV1

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October 26, 2015
ham music radio software
9M2PJU 0 Comments

List Of Best Audio Processing Software For Ham Radio

ableton live nuendo pro tools ozone advanced  sonar x3 reason bitwig cubase acid pro reaper…

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October 21, 2015
club ham radio
9M2PJU 0 Comments

Ham radio and clubs

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October 3, 2015
amateur code ham morse music radio
9M2PJU 0 Comments

Secret Morse Code messages in music

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May 26, 2015
radio shortwave software defined radio
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Listening To Broadcast Radio Stations On Shortwave

Terdapat banyak stesen radio broadcast di gelombang pendek. Rata-ratanya telah berfungsi lebih dari 10 tahun.…

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October 3, 2014
amateur amatur belajar CW ham malaysia morse radio SKMM teknik test
9M2PJU 0 Comments

Tips Belajar Kod Morse Bagi Pemula

Untuk mereka yang ingin belajar kod Morse, terdapat 3 kategori kelajuan akan anda dengari apabila…

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August 21, 2014
communication morse code radio security signal
9M2PJU 0 Comments

Isyarat Kesusahan (Distress Signal)

Isyarat kesusahan merupakan satu isyarat yang dikenalpasti pada peringkat antarabangsa yang bertujuan untuk meminta pertolongan.…

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August 20, 2014
code communication morse radio wireless
9M2PJU 0 Comments

Kod Morse Dan Telegrafi

Kod Morse merupakan satu cara menyampaikan informasi berteks dalam satu siri bunyi atau cahaya yang…

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August 19, 2014
battery communication ham radio radio transceiver
9M2PJU 0 Comments

Maintaining Communication

When making contact with other station, I usually ask about my signal report. This is…

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September 26, 2013
ham radio radio transceiver
9M2PJU 0 Comments

Eliminate Microphone's Interference

Today, microphone became part of the important component to our transceivers. Most of ham radio…

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September 25, 2013
amplitude modulation CW frequency modulation radio transceiver
9M2PJU 0 Comments

What is carrier frequency?

A carrier frequency is a single radio frequency with steady amplitude. Alone, it would sound…

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September 15, 2013
modulation radio receiver transceiver transmitter
9M2PJU 0 Comments

SSB – Single sideband modulation

a summary, information or overview describing what is SSB modulation, and how single sideband modulation…

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September 15, 2013
frequency high frequency radio receiver shortwave
9M2PJU 0 Comments

One Stop Reference For Shortwave Listeners

I would like to share about this website that i used a lot when doing…

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May 31, 2013
amateur archlinux debian fedora ham linux logging radio redhat software ubuntu
9M2PJU 0 Comments

The Best Amateur Radio Logging App For Linux

I am really satisfied with CQRLog for Linux. It support CW keying, general logging, DX…

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April 21, 2013
amateur ham portable radio
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Portable Operation

Portable operation is one of the interesting activity for amateur radio operator. Imagine if we…

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April 7, 2013
amateur malaysia radio
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Malaysian Amateur Radio Outdoor Activities

Estimated population of amateur radio in Malaysia is about 10 thousands. Most of them are…

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April 3, 2013
amateur communication emergency ham hobby licence operator radio
9M2PJU 0 Comments

Amateur radio operator

An amateur radio operator is someone who uses equipment at an amateur radio station to…

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January 26, 2013
communication CW morse code Operating Procedure radio
9M2PJU 0 Comments

CW FACTS AND OPERATING TIPS

By Steven R. Hurst, KA7NOC What does CW mean ? CW stands for "continuous wave",…

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January 18, 2013
communication Continuous Wave CW morse code radio
9M2PJU 0 Comments

What does ‘CW’ really mean?

From Jim Wades, WB8SIW come the following inforation regarding the origins of the term "continuous…

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January 18, 2013
colombia ddb farc gerila kod morse mesej news polis radio tentera tersembunyi
9M2PJU 0 Comments

Mesej Tersembunyi (Morse Code) Dalam Lagu

Di Colombia, polis dan askar yang diculik dan ditahan oleh gerila FARC selama 12 tahun…

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October 20, 2012
code CW morse operator radio signals
9M2PJU 0 Comments

Signals Training Video TF11 – International Morse Code (complete)

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October 19, 2012
code CW morse operator radio signal us army
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Morse Code – Principles and Basic Techniques (US Army Signal)

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October 19, 2012
CQD distress call Harold Bride Jack Phillips mgy operator radio rms SOS titanic
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Panggilan Kecemasan Dari R.M.S Titanic

cerita yang dibikin semula menceritakan bagaimana kehidupan operator radio kapal RMS Titanic, Jack Phillips dan…

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October 18, 2012
9M2PJU amateur radio ham radio kk-9 malaysia morse code pilite radio radio amatur shortwave radio
9M2PJU 0 Comments

Pilite Model KK-9 Shortwave Radio

This is my personal SW, MW and FM radio. SW includes 7 bands. If you…

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October 5, 2012
frekuensi gangguan indonesia jamming kominfo komunikasi penerbangan radio sukhoi terganggu
9M2PJU 0 Comments

Kata Kominfo Soal Gangguan Frekuensi Sukhoi

VIVAnews - Kementerian Komunikasi dan Informatika menyatakan tak mau berspekulasi terhadap dugaan adanya gangguan spektrum…

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July 25, 2012
flight frequency gangguan interfere jamming penerbangan radio terganggu
9M2PJU 0 Comments

Pilot Dengar Dangdut Ketika Terbang

VIVAnews - Penggunaan frekuensi di Indonesia masih belum tertata dengan baik. Hal itu bisa dilihat…

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July 25, 2012
atc flight gangguan interfere komunikasi radio signal sukhoi terganggu
9M2PJU 0 Comments

Sinyal komunikasi sering ganggu penerbangan di Indonesia

Penyebab kecelakaan yang menimpa pesawat jenis Sukhoi Superjet 100, di Gunung Salak masih belum diketahui.…

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July 25, 2012
flight frekuensi gangguan indonesia interfere mengganggu penerbangan radio
9M2PJU 0 Comments

Mengganggu Frekuensi Penerbangan

TEMPO.CO, Banyuwangi - Ketua Divisi Pemantauan dan Penertiban Balai Monitoring, Iwan Purnomo, mengatakan dua radio…

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July 25, 2012
amateur america arrl ham illegal interfere jack gerritsen jamming kg6iro law prohibited radio united states
9M2PJU 0 Comments

Dipenjara Kerana Men-“Jamming”

(This article is about Jack Gerritsen of Bell, CA who had the amateur radio callsign…

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July 25, 2012
antenna frequency radio spiral wireless
9M2PJU 0 Comments

Physically Small Spiral Antenna

http://www.google.com/patents/US7586462?printsec=abstract&dq=physically+small+spiral+antenna&ei=J1_QT4n2M9DOrQehlLiJDA#v=onepage&q=physically%20small%20spiral%20antenna&f=false

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June 7, 2012
CW fact history morse code operator radio SOS wireless
9M2PJU 0 Comments

The simplicity of Morse code telegraphy

Morse code is an on-off code. It is not a binary code since the gaps…

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June 6, 2012
CW emergency call help morse code outdoor radio signal survival wireless
9M2PJU 0 Comments

Surviving With the Help of Morse Code

Everyone has heard of Morse code. It has been almost 144 years since its inception…

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June 6, 2012
antenna CQD distress call emergency mgy radio titanic wireless
9M2PJU 0 Comments

Surfin’: Radioing the Titanic

04/13/2012 By Stan Horzepa, WA1LOUContributing Editor This week, Surfin’ hops on the wayback machine and…

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June 6, 2012
CQD distress call emergency morse code radio signal SOS titanic vessel wireless
9M2PJU 0 Comments

Inspiration and Perspiration — RMS Titanic Distress Signals Heard Again

06/01/2012 The 100th anniversary of the Titanic disaster involved many commemorative events around the world, from Belfast,…

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June 6, 2012
alternating current capacitor coil direct current inductor linear power power suppy unit psu radio source supply switching transceiver transformer transistor
9M2PJU 0 Comments

Linear VS Switching Power Supply

For amateur radio operators, linear and switching power supplies are the most common power supplies…

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November 20, 2011
amateur radio antenna emi filter high frequency magnetic power radiation radio receiver source switching mode power supply transceiver
9M2PJU 0 Comments

Switching Mode Power Supply (SMPS) Interference

1. Why are Switched Mode Power Supplies (SMPS) associated with radio interference? Switched mode power supplies…

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November 20, 2011
9w2agu amatur radio astra frekuensi gelombang hamradio iaru malaysia mcmc melayu memancar radio radio amatur SKMM
9M2PJU 0 Comments

Bagaimana Untuk Memancar Di 40 Meter Band

Saya tertarik kepada komen yang di berikan oleh pelawat blog saya ini. rujuk komen http://9m2pju.blogspot.com/2011/08/2-meter-audio-on-40-meter.html…

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November 19, 2011
9M2PJU all band all mode amateur radio digital signal processing dsp equalizer kuala lumpur malaysia multimode radio radio amatur rig specification transceiver yaesu
9M2PJU 0 Comments

Yaesu FT857 All Band All Mode DSP Transceiver

The Yaesu FT-857D is a multimode amateur transceiver that transmits and receives communications on bands…

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November 15, 2011
basikal basikal dan radio amatur hamradio malaysia melayu radio radio amatur
9M2PJU 0 Comments

Basikal Dan Radio Amatur

Ya, basikal dan radio amatur. apa kaitannya ? mari kita lihat dari beberapa sudut, basikal…

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October 21, 2011
amateur radio aviation distress call emergency frequency hamradio mayday mayday procedure words prowords radio vessel
9M2PJU 0 Comments

MAYDAY MAYDAY

please watch this video first. A proword is short for procedure word, or phrase. MAYDAY…

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October 15, 2011
hobby low power malaysia QRP radio radio amatur radio amatur malaysia
9M2PJU 0 Comments

What Do I Think About QRP ?

QRP means low power, low powered station. it can be a question, answer or a…

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October 13, 2011
antenna cat whisker crystal electronics foxradio hobby project radio receiver transistor
9M2PJU 0 Comments

Build Your Foxhole Radio

During World War II, GIs in the field built really amazing simple radios to listentoo.…

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October 9, 2011
acoustic decibel energy field physics power radio unit
9M2PJU 0 Comments

Decibel

The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity…

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October 9, 2011
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9M2PJU 0 Comments

Antenna diversity

Antenna diversity, also known as space diversity, is any one of several wireless diversity schemes…

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October 9, 2011
amateur radio continoues wave CW frequency long path communication malaysia morse code QRP radio radio amatur tour travel world
9M2PJU 0 Comments

We Need More CW Opr

Yes, we need more CW operator on HF bands. Lately, i am so excited working…

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October 5, 2011
amateur radio communication CW education frequency fun hamradio hobby kod morse learn mari belajar morse code radio radio amatir radio amatur signal study unique wave
9M2PJU 0 Comments

Morse Code Is Fun

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October 5, 2011
amateur earth ham IIS iphone moon palmos PDA pocketsat radio satellite sky software tracking
9M2PJU 0 Comments

Pocketsat+ – Satellites Tracking Software For Your PDA and iPhone

    PocketSat+ is a full-featured satellite tracking application for PalmOS and PocketPC devices. It…

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September 14, 2009

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  6. 9M2PJU Dipole Antenna Calculator
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  12. 9M2PJU Easy Recipe Finder
  13. 9M2PJU Drain Calculator
  14. 9M2PJU SWR Calculator
  15. 9M2PJU Quran Verse of the Day
  16. 9M2PJU Enigma Machine Simulator
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  20. 9M2PJU RSA Key Generator

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