| 摘要 |
PURPOSE:To control properly a signal power distributor which uses a hybrid circuit and a power amplifier regarding the signal power distributor by operating an ALC circuit only when input high frequency signal electric power and composite high frequency signal electric signal is in proportional relation. CONSTITUTION:The input side of the 1st detector 6 is connected to a terminal 1a of a linear amplifier and high frequency electric power outputted from a transmitter 2 is detected and sent out to one input side of a differential amplifier 9. The input side of the 2nd detector 7 is connected to a terminal 1b and high frequency signal electric power composed by a signal power synthesizer is detected. The 2nd detection signal generated by the detection is attenuated by an attenuator 8 and inputted to the other input terminal of the differential amplifier 9. An attenuator 8 is so constituted that the 1st detection signal and the 2nd attenuated detection signal are invariably equal in every operation area. The difference between the 1st detection signals inputted to one input side and the other input side of the differential amplifier 9 is sent out as an ALC signal to the transmitter 2 through an ALC terminal 1c.
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