I decided to try and build a transmitter from two discarded radios. Both were originally machines for receiving radio waves.

A new ultra-low-power method of communication at first glance seems to violate the laws of physics. It is possible to wirelessly transmit information simply by opening and closing a switch that ...

The circuit was designed to operate a voice transmitter over the AM medium wave band under a limited power output. Amplitude Modulation – a method or technique of emphasizing and transmitting data or ...

The author is retired from Harris Broadcast. The paper was written in the 1990s and includes updated information at the conclusion. This paper discusses how a major solid-state (SS) program got ...

The High Frequency Active Auroral Research Program (HAARP) transmitter is primarily used for basic research into the interactions of high-power radio waves with the high-latitude ionosphere. As noted ...