The APR4 receiver was first used in 1944. It was designed for frequency detection, modulation type indication of strength, and monitoring of transmitters and radars in the frequency range of 38 to 4000 MHz. It was a special receiver for the needs of radio-electronic warfare, intended for ships and aircraft. The range of the receiver was varied by changing the input block of the receiver. Originally the APR4 was fitted with all-metal tubes, but during the year it was upgraded to the APR4Y using modern all-glass American tubes. The sub-range tuning was manual or motorised.
Range: 38 to 95, 74 to 320, 300 to 1000, 975 to 2200 and 2150 to 4000 MHz Operation: APR4 A1, A3, APR4Y A1, A3, F3 Signal output: switchable bandwidth for headphones and wideband for panoramic and video analyzer Power supply: APR4 115/80 V 60 to 2000 Hz + 28 V DC for motor, APR4Y 115 V 380 to 1000 Hz and 28 V DC
Source.
URL : https://www.valka.cz/AUS-APR4-APR4Y-prehladavaci-prijimac-t107913#383695
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