| 摘要 |
An improved communication system using an active transponder to relay microwave signals from any one of a number of transmitting stations to selected groups of receiving stations. In a preferred system the active transponder is installed in a satellite spacecraft and is arranged to convert a number of signals, in closely spaced channels, from the transmitting stations in such a manner that the bandwidth of each one of the relayed signals is increased and retransmitted without suffering from the effects of interchannel modulation.
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