The STR37E VHF Aircraft Radio Transceiver is made by STC Standard Telephone and Cable. It is a small VHF Aircraft Radio Transceiver that can be directly panel mounted in the aircrafts cockpit, easy frequency selection by two large knobs mounted on the front panel. It operates in the frequency range of 116.00 MHz to 135.95 MHz, 400 total channels with 50KHz Channel Spacing. The Squelch and Volume Control along with the ON/OFF Switch are also mounted on the front panel. Transmitter Power Output 1 Watt. It is very nicely constructed with metal chassis. Uses a standart 36 pin Centronics connector on the back panel for DC power and audio interface to speaker / headset and microphone. The radio runs from a standard aircraft 28 Volt power supply.
These radios are supplied in very nice condition and include the test certificate.
The Centronics pin-out is:
Pin-1 Negative & case (GND)
Pin-2 Radio +ve (+28 Volts)
Pin-3 PTT
Pin-19 Panel Bulb +ve (+28 Volts)
Pin-21 & Pin-22 Audio output