Radio Communication

International Radio Encryption Algorithm Reveals ‘Backdoor’

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International Radio Encryption Algorithm Reveals 'Backdoor'

The Terrestrial Trunked Radio (TETRA) standard, developed by the European Telecommunications Standards Institute (ETSI), is one of the most widely used radio encryption communication standards globally. It is extensively adopted by communication equipment manufacturers such as Motorola and Sepura, with applications spanning over 100 countries, primarily for encrypted communications in police, rescue, military, and critical … Read more

In-Depth Analysis of Drone Interference Principles

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In-Depth Analysis of Drone Interference Principles

The device consists of a handheld main unit and a battery pack. The handheld main unit features an integrated design with a tri-band transmitter antenna, capable of simultaneously generating 2.4GHz/5.8GHz frequency drone control interference signals and satellite positioning interference signals. By blocking the uplink control channel and satellite positioning channel of the drone, it causes … Read more

Connecting PS/2 Keyboard to BBC micro:bit for Enhanced Communication

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Connecting PS/2 Keyboard to BBC micro:bit for Enhanced Communication

Translated from: http://www.suppertime.co.uk/blogmywiki/2020/08/ps2-keyboard-microbit/ For many years, I have wanted to connect a regular computer keyboard to the BBC micro:bit to make radio messaging and encryption easier to use. I had seen and used something similar on Arduino, which used a complex C++ library to read data from a PS/2 keyboard, parsing each data bit. But … Read more

Send Text Messages Without a Mobile Phone Using HamMessenger

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Send Text Messages Without a Mobile Phone Using HamMessenger

Use HamMessenger to easily send text messages via Very High Frequency. I first encountered radio communication when I was about five or six years old. My father was an electrician at the airport, and he often brought home a walkie-talkie, which my brothers and I would play with in the garden. This was my only … Read more