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Self correction of PST simulcast system timing

  • US 5,517,680 A
  • Filed: 01/22/1992
  • Issued: 05/14/1996
  • Est. Priority Date: 01/22/1992
  • Status: Expired due to Term
First Claim
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1. In a radio frequency communications system having plural spatially separated RF transmitters all transmitting substantially the same signal at substantially the same radio frequency, said system providing a common clocking signal distributed to each of said plural transmitters so as to facilitate a substantially simultaneous signal transmission by said plural transmitters, each of said plural RF transmitters including:

  • a first circuit arrangement, which determines, at least in part, transmission timing for producing said substantially simultaneous signal transmission, said first circuit arrangement including a modem, wherein said modem generates an internal clocking signal and includes at least one control register for storing control information that instructs said modem to perform various functions, anda second circuit arrangement which repetitively commands said first circuit arrangement to utilize said common clocking signal in producing said substantially simultaneous signal transmission, wherein said second circuit arrangement repetitively rewrites said control register with control information instructing said modem to use said common clocking signal instead of said internal clocking signal.

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