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The radio set-top box "Radio Cassette" was produced since 1972 by the Arzamassky PSZ named after
50th anniversary of the USSR.
RK is intended for use with the Legenda-401, Legenda-404 and Sputnik-401 tape recorders, turning them into radio tape recorders.
RK was produced mainly according to the direct amplification scheme, but there was a pilot production according to the superheterodyne scheme (below), however, all produced RK were experimental.
The range was mainly Long Waves, but there were lots for the Medium Waves range, both in the direct amplification scheme and in the superheterodyne circuit.
For the most part, the RK was produced according to the direct amplification scheme for the "Long Waves" range with changes in the scheme according to the years of production, and a radio cassette was produced until the beginning of the 80s.
The RCs for Legenda-401 and Legend-404 tape recorders had different designs and connectors, 401 models on the right and 404 models on the left.
RK is a high-frequency part of the receiver with a detector, after which the signal is amplified by an ultrasonic recorder.
The sensitivity of the radio cassette in the DV range is 15 mV / m, CB 8 mV / m both in the direct amplification circuit and in the superheterodyne circuit.
The selectivity is 6 ... 8 dB in the direct amplification circuit and 12 ... 15 dB in the superheterodyne circuit.
Current consumption about 5 mA.