| 摘要 |
PURPOSE:To attain the single radio channel talking in the FM modulation simultaneous transmission/reception by providing a repeater circuit and a synchronizing circuit in a radio equipment and using n-wave of radio frequencies. CONSTITUTION:The single radio channel system consists of n-set of FM modulation simultaneous transmission/reception radio equipments each having a synchronizing circuit and a repeater circuit and uses n-wave of radio frequencies. The repeater circuit makes the element talking only with one opposite station in the simultaneous transmission/reception possible for the talking among n-set of radio equipments so as to bypass the received voice in the radio equipment into the sending side and send the voice in another frequency. The synchronizing circuit combines the voice sent from its own radio equipment with the entirely inverted signal when the voice is returned via the (n-1)-set of radio equipments. The signal going to the sending side of its own radio equipment via the repeater circuit is cancelled to prevent howling.
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