Circuit : Andy Collinson
A small FM voice transmitter for Band 2 VHF. It can be tuned by adjusting the turns on the coil.
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.