This transmitter has excellent range when using an external antenna (respecting legal restrictions). The circuit must be powered by a battery or source with excellent filtration. The power transistor must be mounted on a heatsink. The modulation comes from an electret microphone and the modulation is set to P2. C4 can be exchanged for a trimmer to adjust the frequency. Choque 1 consists of 40 turns of wire 32 in a 100k x ½ W resistor.
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