Research/Patents/US 6057798
US 6057798

APPARATUS AND METHOD FOR FREQUENCY MODULATION

Assignee

Filed

Jan 18, 1985

Granted

May 2, 2000

Location

CHELMSFORD MA US

Abstract

A method and apparatus for frequency modulating a continuous wave signal is shown to comprise a voltage-controlled oscillator (VCO) having a first and a second control loop to maintain the carrier frequency of such VCO at a frequency determined by a crystal-controlled oscillator and to maintain the peak deviation of the FM modulation on such carrier frequency at a value equal to the deviation of the first Bessel null from the carrier frequency.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

May 15, 1986

Rescinded

Aug 10, 1999

Duration

13 years, 3 months

Inventor

  • 1RICHARD W. BURRIER

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records