| 摘要 |
PURPOSE:To make it possible to constitute a pilot AGC system at a low price by making it possible to extract a pilot signal using a relatively inexpensive narrow- band filter for outband signals, by inserting a pre-modulation carrier as the pilot signal. CONSTITUTION:In order to enable narrow-band filtrs SBF4 and SBF5 with the pass band of out-band signals to extract premodulation carrier CAR11 inserted as a pilot signal from a subordinate station, modulator MOD5 modulates a signal obtained by dividing carrir CAR3 by divider DVF and narrow-band filters SBF4 and SBF5 convert the frequency of the extracted pilot signal. Pilot signals extracted by narrow-band filters SBF4 and SBF5 are made into a AGC control voltage amplified and detected by control circuit CONT, and it is applied to AGC amplifier AGCAMP. |
