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Scanning receiver for nationwide radio paging system

  • US 5,122,795 A
  • Filed: 03/01/1989
  • Issued: 06/16/1992
  • Est. Priority Date: 08/08/1985
  • Status: Expired due to Term
First Claim
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1. In a radio paging system comprising input means for inputting paging information, a plurality of radio common carriers located in the same geographical area, each of said common carriers being adapted to broadcast a paging signal having a predetermined format on a predetermined frequency, the improvement comprising:

  • network means coupled to said input means and to said plurality of radio common carriers for connecting said plurality of radio common carriers into a network, said network means being adapted to receive paging information from said input means over a first transmission path and providing said paging information to a selected one of said radio common carriers over a second transmission path for radio broadcast; and

    receiver means for receiving said paging signal broadcast by any one of said radio common carriers, said receiver means comprisingantenna means for receiving said paging signal;

    oscillator means for providing a reference signal;

    mixer means coupled to said antenna means and to said oscillator means for mixing said paging signal with said reference signal to produce a second paging signal;

    logic means coupled to said oscillator means for controlling said oscillator means to generate said reference signal at a selected one of a plurality of predetermined frequencies, wherein said receiver means is caused to scan predetermined frequencies;

    detector means coupled to the output of said mixer means for receiving said second paging signal and detecting said paging signal on any one of said scanned predetermined frequencies and providing a detection signal when said paging signal is received, said logic means receiving said detection signal and controlling said oscillator means to lock said receiver means onto the current scanned frequency and receive said paging signal;

    decoder means for decoding said second paging signal to retrieve said paging information; and

    output means coupled to said decoder means for outputting to a user at least some of said paging information.

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