| 摘要 |
<p>PURPOSE:To finely adjust the resonance frequency of an output tank circuit and correct it by supplying a part of electric oscillation accumulated in the output tank circuit to a ceramic oscillator and performing the class C operation of a transistor by feeding back the inverted phase oscillation voltage of proper oscillation frequency of the ceramic oscillator to the base of the transistor. CONSTITUTION:A part of the electric oscillation accumulated in the output tank circuit 66 is supplied to the ceramic oscillator 20 via a resistor, and the electrical-mechanical oscillation of the oscillator 20 is performed. An AC opposite in phase is induced on the opposite terminal of the ceramic oscillator 20, and it is fed back to the base of the transistor 22 via the resistor 25 as fine oscillation of voltage opposite in phase, and it is subjected to phase-inversion amplification by the use of the transistor 22, and the collector output of the transistor is class C-operated by driving the output tank circuit 66 the same in phase. In this way, it is possible to correct the resonance frequency of the output tank circuit 66 by fine adjustment.</p> |
