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Simulcast same frequency repeater system

  • US 4,475,246 A
  • Filed: 12/21/1982
  • Issued: 10/02/1984
  • Est. Priority Date: 12/21/1982
  • Status: Expired due to Term
First Claim
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1. In a simulcast communication system including a transmitting station for transmitting a first signal at a given frequency and a same frequency repeater (SFR) for receiving the first signal and for retransmitting the received signal at the given frequency, the SFR having a time delay of T such that the signal transmitted by the transmitter of the SFR consists of said received signal delayed in time by T, said retransmitted signal as received by the receiver of the SFR defining a spillover signal, the improvement:

  • comprising;

    a. means coupled to the transmitting station for generating a second signal derived by time delaying said first signal in time by approximately T so that said second signal and said spillover signal are in phase with each other at the SFR receiver; and

    b. means coupled to said SFR for substantially cancelling said spillover signal, said second signal and said spillover signal being received in phase with each other by said SFR such that the second signal and the spillover signal are substantially cancelled by said cancelling means.

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