This circuit converts signals from the shortwave band to the 118 to 130 MHz VHF band used in aviation. The circuit uses a 55 MHz crystal. We found it in documentation from the 90s.
Originally this circuit was designed to power tube transceiver equipment in the car, using a 12 V...
This circuit is from a Radio Electronics from February 1966. The circuit is of a type that was...
This circuit is from a Japanese publication in 1967. The circuit uses a Geiger-Muller valve and...