The Passive Aircraft Receiver is basically an amplified “crystal radio” designed to receive nearby AM aircraft transmissions. The “passive” design uses no oscillators or other RF circuitry capable of ...

The project was designed to create an accurate radio altimeter with dual-channel homodyne receiver intended as a landing aid for small general-aviation aircraft equipped with synthesized-voice human ...

Last month, in part one of Radio Prepares for War we looked at the National HRO receiver, which set the bar for the standards required by military radio communications. The HRO was a superb receiver ...

I’ve been told all my life about old-timey Army/Navy surplus stores where you could buy buckets of FT-243 crystals, radio gear, gas masks, and even a Jeep boxed-up in a big wooden crate. Sadly this is ...

Marked: "Signal Corps, U.S. Army / Airplane Radio Receiving Set / Type SCR 59 / Serial No. [blank] / Order No. W4076 / Made by Western Electric Co., Inc." Plate on ...