This small short-range FM transmitter was found in a 1987 documentation. It is intended for the emission of signals by a microphone and incorporates an oscillator for the practice of telegraphy. The coil consists of 3 +4 turns of wire 28 in a 0.5 cm diameter coreless shape. The trimmer is common at 20 to 40 pF of maximum capacitance. The antenna is 10 to 40 cm long.
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