FM Transmitter for Band 2 VHF
This small transmitter
uses a hartley type oscillator. Normally the capacitor in the tank circuit would
connect at the base of the transistor, but at VHF the base emitter capacitance
of the transistor acts as a short circuit, so in effect, it still is. The coil
is four turns of 18swg wire wound around a quarter inch former. The aerial tap
is about one and a half turns from the supply end. Audio sensitivity is very
good when used with an ECM type microphone insert.