| 摘要 |
PURPOSE:To keep the natural operation state in accordance with the design standard of the transmitter, by inserting only the carrier via the switch operation in the non-modulation state, cutting off the carrier through the switch operation and then setting the proper duty ratio of the carrier. CONSTITUTION:Carrier inserting switch circuit 9 is installed between the output of carrier oscillator 3 of the SSB transmission circuit and the input of driver amplifier 6. Then control oscillator 10 is connected to circuit 9 to secure the electric switching control for circuit 9. Oscillator 10 is controlled by the output of mono-multi oscillator 11, and the intermittent carrier is transmitted in case oscillator 10 is put under the oscillation state. Then the normal SSB transmission is carried out automatically in the state under which the oscillation of oscillator 10 stops. The duty ratio of transmitter 10 is set in accordance with the design standard of the transmitter, thus keeping the natural operation state in the non-modulation state. |
