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FM wireless transmitter

  • US 4,612,668 A
  • Filed: 07/23/1984
  • Issued: 09/16/1986
  • Est. Priority Date: 07/23/1984
  • Status: Expired due to Fees
First Claim
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1. An FM wireless transmitter, comprising in combination:

  • (a) an electronic oscillator mounted to a printed circuit board;

    (b) a printed circuit inductances which is part of the frequency determining reactance of an LC circuit and also serves as a radiating antenna;

    (c) a metal plate in close proximity to said printed circuit board;

    (d) said metal plate attached to a case which surrounds said printed circuit board and forming a capacitance with said LC circuit, where said plate is exchangeable with other plates of varied surface area and casing is interchangeable with other casings having different dimensioned plates attached therein to change the capacitance to thereby vary the resonant frequency of said LC circuit;

    (e) an audio input which modulates the frequency of said oscillator, thereby producing a frequency modulated signal; and

    (f) a power source for said oscillator.

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