| 摘要 |
PURPOSE:To stabilize the transmission signal level without increasing the loss of a signal level of a main circuit by generating a reference signal of a comparison amplifier outputting an error signal through the same signal path for a signal branched from an input signal. CONSTITUTION:A transmission signal of an input terminal 1 is fed to an output terminal 5 through a level control section 2, a transmitter 3 and a coupler 4. The signal extracted by the coupler 4 is fed to the comparison amplifier 7 through a switch 10, an RF amplifier 9, a detector 6 and a switch 11. When the switches 10-12 are thrown to the position of lower contacts, an output of an oscillator 15 is held in a hold circuit 14 as a reference signal of the comparison amplifier 7 through a level adjusting device 17, an RF amplifier 9 and the detector 6. An output of the comparison amplifier 7 is given to the level control section 2 via the switch 12 and the hold circuit 13. |
