| 摘要 |
PURPOSE:To measure the reception state accurately even when a band of intermediate frequency amplification is narrow. CONSTITUTION:A gain of a variable gain amplitude detection circuit 116 detecting an amplitude of a reception signal is controlled in a direction to cancel a band characteristic in an intermediate frequency amplifier circuit 13 by an output signal of a function generator circuit 110, and the overall band characteristic in an amplitude detection circuit detecting the amplitude of a reception signal is made flat thereby eliminating the effect of a component relating to n angular modulation signal of the reception signal in a desired wave. |
