| 摘要 |
PURPOSE:To attain accurate tuning without depending on an input signal level by applying a constant control voltage independently of a high-frequency input signal carrier level to a gain control circuit for high frequency amplifier at channel selection tuning only. CONSTITUTION:The gain control circuit section 2 for high frequency amplifier is selected at the channel selection tuning only and a constant control voltage independently of the input signal level is applied from a power supply 12 by using a switch 11. Thus, the tuning characteristic of a receiver at a weak input signal is obtained indepedently of the input signal level to obtain a true tuning point.
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