| 摘要 |
PURPOSE:To enable to keep the signal levels of two waves at a constant level, by using the unbalance and balance transformer, even if two high frequency signals are input. CONSTITUTION:Two high frequency signals from the input terminal are fed to the high frequency amplifier 2 via the control element 1, and the output is detected at the diode 3. The output is fed to one unbalanced input terminal of the unbalance, balance transformer T1, and another input terminal is grounded via the diode D2 and capacitor C2. Further, the balanced output is fed to the load resistor R1 one end of which is grounded via the balance adjusting resistor R2. Further, the voltage produced across the resistor R1 is compared with the reference voltage 4 at the DC differential amplifier 5, and the AGC circuit is formed by applying this output to the control element 1. Thus, if one wave is changed among the two waves, the level of the two waves can be kept constant without the change in the output level of another wave. |
