| 摘要 |
A tuning voltage circuit for providing a tuning voltage which is corrected by an automatic frequency control error voltage for application to a voltage controlled radio frequency tuning means for a television receiver is shown. The voltage controlled radio frequency tuning means has a non-linear frequency versus tuning voltage characteristic which causes the sensitivity of the tuning means to the error voltage to vary over the frequency range of interest. The tuning voltage circuit includes a high impedance tuning voltage source which provides sensitivity compensation for the automatic frequency control error voltage to compensate for variations of the automatic frequency control pull-in range in the frequency range of interest.
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