The transmitter is assembled on a BFR93 microwave transistor, on the transistor case there is an inscription "R2W". The range in open areas is more than 400 m, checked with a radio. The SAW resonator 433MHz is taken in a metal case
The antenna is 11.5 cm long, I made it longer, the generation disappears
The coil is wound on a bicycle spoke, its diameter is about 2 mm and contains 6 turns of 0.5 mm wire. The choke is several microhenries (10uH). The modulation voltage (volume) must be set so that the sound does not wheeze or increase sharply
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