Knowledge back pager with frequency control apparatus

  • US 4,823,123 A
  • Filed: 01/07/1988
  • Issued: 04/18/1989
  • Est. Priority Date: 01/07/1988
  • Status: Expired due to Term
First Claim
Patent Images

1. An acknowledge back pager for processing paging signals transmitted at a paging channel frequency of FRX from a central paging station, said pager comprising;

  • a local oscillator oscillating at a frequency FLO to generate an FLO signal;

    first mixing means, coupled to said oscillator, for mixing said paging signals with said FLO signal to generate a down-converted signal at a frequency FC ;

    frequency determining means, coupled to said first mixing means, for determining the frequency FC of the down-converted signal;

    sub-band selection means for selecting one of a plurality of frequency sub-bands on which said pager is to transmit an acknowledge back signal, said selection means determining a selected sub-band and a frequency offset FD corresponding to said selected sub-band, said offset FD being with respect to the frequency FRX ;

    memory means for storing the value of the frequency FRX ;

    determining means for determining the value of N for the selected sub-band wherein
    
    
    space="preserve" listing-type="equation">N=(F.sub.RX -F.sub.C)/(F.sub.D +F.sub.C)dividing means, coupled to said determining means, for dividing the FLO signal by N to generate an FLO /N signal, andsecond mixing means, coupled to said dividing means and said oscillator means, for mixing said FLO signal with said FLO /N signal to generate a carrier signal for said acknowledge back signal.

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