This radio remote receiver is a super reaction with RF amplifier, T1, and works in UHF-FM band.
Antenna signal is applied on inductance to the BNC jack input, K1. The input is tuned with C4.
Amplified RF signal is applied to the input stage of super reaction based on transistor T2. Modulation of low frequency component is extracted from the signal oscillator with low-pass filter C11-R6-R7-R8-C13-C12. The output signal from the demodulator is 50-800 mVvv, additional amplification is needed before applying a digital input.
Inductances of the input and output RF amplifier are made of a copper wire of 1 mm diameter silver.
Conductor is at a height of about 3 mm above the plate. Stator terminal of C4 is bent up and glued directly on the line inductive input. The same situation is found in the common point of C6-C7, bonded directly to the hot end of the line inductive.
Coil L1 consists of 12 turns of enamelled copper wire with diameter 0.6 mm (inside its diameter is 3 mm).
Shocks L2 and L3 consist of 4 turns each wire of 0.2 mm diameter enamelled copper ferrite wound on a 3 mm long.