Two-meter, two-watt FM phase-locked transmitter


The circuit directly oscillates to obtain an operating frequency of 144 to 148MHz without using a frequency multiplier. The phase lock of the oscillator and crystal guarantees the stability of the oscillator. Within the tuning range of 143 to 149MHz, the corresponding varactor diode control voltage is 1 to 4V, which maintains a suitable loop gain for the entire frequency band. The microphone preamplifier U5 is slightly overexcited, so the speech waveform is clipped or clipped. The phase-locked circuit makes the frequency stability as good as the crystal used in the reference oscillator. Divide the required signal frequency by 25 to get the crystal frequency.

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6Gang Switch And Multi Function Socket

6Gang Switch And Multi Function Socket,6Gang Switch,Multi Function Socket,Multi Function Socket Wrench

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