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Radioelectric signal trains generator and portable transmitter comprising such a generator

  • US 4,430,757 A
  • Filed: 02/03/1982
  • Issued: 02/07/1984
  • Est. Priority Date: 11/19/1981
  • Status: Expired due to Fees
First Claim
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1. An electrical pulse train generator comprising:

  • supply means for providing direct-current electrical power;

    a condensor and first resistance serially connected together at a first point and connected across said supply means;

    a transistor having a base, emitter and collector;

    a second resistance connecting the base of said transistor to said first point;

    said emitter of said transistor being connected to said supply means;

    a quartz crystal connected between said collector and base of said transistor, said crystal oscillating at a third harmonic frequency;

    said generator including means turned to the third harmonic frequency of said quartz crystal for producing oscillations at relatively high frequencies in the megahertz range;

    means for periodically driving said transistor from a blocking state into saturation by charging and discharging said condensor to periodically pass said oscillations; and

    antenna means for emitting said oscillations.

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