| 摘要 |
PURPOSE:To decrease the number of cables between the master unit and the transmitter by mixing the modulation signal and the transmitter driving power voltage together and then carrying out the transmission from the master unit to the transmitter. CONSTITUTION:With operation of modulation signal oscillator 8A, the driving power of transmitter 2A is applied to the modulation transformer of low frequency amplifier 4A via power control circuit 13 and then mixed up with the power voltage. The mixture signal sent from master unit 7A is applied to high frequency amplifier 5A, and then the AM modulation is applied by varying the collector voltage of circuit 5A. At the same time, the modulation component is eliminated from the mixture signal through capacitor C and resistance R for application to carrier oscillator circuit 3A to be used as the power source of circuit 3A. |
