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FM transmitter 2KM circuit

2016-04-01 11:21  
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FM transmitter 2KM circuit
The figure shows the FM transmitter 2km circuit. The circuit is divided into three phases, which are the shock, frequency and power amplification. V1, C2 ~ C6, R2, R3, and L1 in the circuit form the three-point capacitance oscillator, whose oscillation frequency is mainly determined by parameters of the C3, C4 and L1. Its oscillation frequency is 44 ~ 54MHz. The relative signal is output from L1's center tap and then coupled to the V2 for amplification through C7. Then 44 ~ 54MHz second harmonic signal would be selected from C8 and L2, which equals to 88 ~ 108MHz. At this time, the signal is coupled to V3 power amplification through C9. And V3 is composed by three 3DG12 transistors in parallel, aiming to expand the output frequency.