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Crystal controlled stepping radio receiver having novel oscillator circuit

  • US 3,996,522 A
  • Filed: 11/17/1975
  • Issued: 12/07/1976
  • Est. Priority Date: 11/17/1975
  • Status: Expired due to Term
First Claim
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1. In a stepping radio receiver for production of audio signals from radio frequency signals and capable of tuning to several separate channels which radio receiver includes:

  • a. an RF signal receiving means, a mixer, and an oscillator means;

    b. said RF signal receiving means being for providing sufficient RF signal level for said mixer means;

    c. said RF signal receiving means and said oscillator means being coupled to said mixer means;

    d. an audio detection means coupled to said mixer means for producing an audio signal when an RF signal is being received, said audio detection means including squelch means for preventing the production of an audio signal when an RF signal is not being received;

    e. said oscillator means being coupled to said mixers and operable at a given several frequencies, there being one frequency for each channel to which the receiver can tune;

    said oscillator means including several piezoelectric crystals for determining the frequency of oscillation of said oscillator means;

    f. stepping means which is defeatable and which has several outputs which are coupled to said oscillator means for stepping said oscillator means through said given several frequencies;

    g. locking means which is connected to the stepping means for defeating said stepping means as long as an RF signal is being received and allowing resumption of operation of said stepping means when no signal is being received;

    the improvement which comprises;

    an oscillator means having

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