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Simple long-distance wireless FM microphone circuit

2016-11-26 15:41  
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Simple long-distance wireless FM microphone circuit
The the loop antenna L1 for emission also serves as the oscillation coil, the high-frequency current flowing in antenna is synchronized resonance with the oscillation frequency, so it is always in the best emission state. Accoring to practice, launching distance is about 100 ~ 150m in empty mine. In contrast, in the case of equal working voltage, current and emission frequency, L1 is replaced by ordinary spiral coil, the oscillation transistor collector is connected to a 5pF capacitor and 0.8m Rod antenna for emission experiments, the two the transmitting distancea are almost equal. So it proves that the concealed loop antenna( it doubles the oscillator coil) has high emission efficiency.