| 摘要 |
The invention relates to an AFC tuning circuit which is combined with a coincidence demodulator circuit for frequency-modulated oscillations. The invention consists in that, in parallel with the demodulator of the coincidence circuit, a further demodulator is connected whose two outputs, which supply current alternately and in proportion with the frequency detuning, activate current balancing circuits which supply a tuning unit, which contains a variable-capacitance diode in the oscillator resonant circuit, with positive and negative currents in a proportion corresponding to the detuning.
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