This simple FM transmitter powered by batteries or battery was found in a 1997 documentation. It can function as a wireless microphone or even for espionage. The antenna is 15 to 40 cm long and the L1 coil is formed by 4 turns of wire 18 to 22 with a diameter of 1 cm without core. The frequency adjustment is made by squeezing and loosening the coil turns.
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