A backup plan makes good military sense, and the properties of radio waves between 3 MHz and 30 MHz, especially the ability to bounce off the ionosphere, make HF radio a perfect fit. The United ...

Talking about this Chinese ham radio transceiver requires a veritable flurry of acronyms: HF, SSB, QRP, and SDR to start with. [Paul] does a nice job of unboxing the rig and checking it out.

A ray gun that uses high-frequency radio waves to take out enemy drones and costs just 10p to fire has been successfully trialled by the British Army. The radio frequency-directed energy weapon ...