| 摘要 |
PURPOSE:To obtain high reliability and small size by constituting the synthesizer by a block filter of a transmission frequency of a 2nd transmitter connected to a 1st transmitter, a band-pass filter of a transmission frequency of the 2nd transmitter connected to the 2nd transmitter and a transmission line only so as to offer very simple constitution. CONSTITUTION:An output signal of a video transmitter 1 is led from a video input terminal 36 of an output synthesizer 3 and given to a audio blocking filter 32a. On the other hand, the output signal of the voice transmitter 2 is led from a voice input terminal 38 of the output synthesizer 3 and fed to a voice pass filter 32c. Then the impedance of the voice blocking filters 32a, 32c and the length of 1st and 2nd transmission lines 39c, 39d are selected so that the impedance when viewing the voice blocking filters 32a, 32c from a synthesis point 39e is infinite at the transmission frequency of the voice transmitters 2, 1. Thus, the output signal of the video transmitters 1, 2 led to the synthesis point 39e is sent to an antenna 4 via an output terminal 37 through a transmission line 39f entirely.
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