PRM-32 (TS-20) Test Set, Radio 1978

This test set allows two PRC-90 radios to be used to test each other. The radio that is transmitting has some of it's energy rectified and used to drive the transmit signal strength meter thus confirming that the transmitting radio and battery are working. The PRM-32 will operate with transmissions in the civilian aircraft band around 121.5 MHz as well as the military distress frequency range around 243 & 282.2 MHz. Inside there is what amounts to a waveguide below cutoff attenuator that reduces the transmitted signal by about 104 dB.