| 摘要 |
<p>RADIO TRANSMITTER-RECEIVER SYSTEM FOR INCREASING OR DECREASING COMMUNICATION CHANNELS The radio transmitter-receiver system for increasing or decreasing communication channels comprises radio transmitter receivers each including a separated intermediate frequency portion for modulation and demodulation and a separated microwave portion, and having a multiplexer and a divider therebetween. Local oscillators in the intermediate frequency portion have a variable frequency function and the operating frequency of the intermediate frequency portion can be easily changed. The intermediate frequency portions are connected to the microwave portions through the multiplexer or the divider and the frequency of the microwave to be communicated is easily changed. Thus, an increase or decrease of the communication channels is possible at a low cost.</p> |
