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Multi band radio receiver system with phase locked loop

  • US 4,223,406 A
  • Filed: 01/29/1979
  • Issued: 09/16/1980
  • Est. Priority Date: 01/30/1978
  • Status: Expired due to Term
First Claim
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1. Apparatus for producing a variable local oscillator frequency signal for use in a radio receiver comprising:

  • controllable means for generating a variable frequency signal;

    phase locked loop means for generating said variable local oscillator frequency signal including mixer means for mixing signals related to said variable frequency signal and said variable local oscillator signal to produce a third frequency signal, scaler means for dividing said third frequency signal by a changeable scale factor to produce a fourth frequency signal, and error signal generating means for generating an error signal in response to said fourth frequency signal varying from a reference frequency said error signal controlling said phase locked loop generated variable local oscillator signal; and

    scale factor determining means, for producing said changeable scale factor in relation to at least one of the frequencies of said variable frequency signal and said third frequency signal, including a plurality of frequency counters in cascade and input control means operative for gating a signal related to said third frequency signals into said plurality of frequency counters for a predetermined time, and further operative for gating a signal related to said variable frequency signal into said plurality of frequency counters for a second predetermined time.

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