Apparatus and method for frequency modulation

Details Apparatus and method for frequency modulation Apparatus and method for frequency modulation

1985-01-18

2000-05-02

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

For frequency modulation

342199, G01S 728

Patent

active

060577983

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.

REFERENCES:
patent: 4023116 (1977-05-01), Alfke et al.
patent: 4123719 (1978-10-01), Hopwood et al.
patent: 4176351 (1979-11-01), DeVita et al.
patent: 4593287 (1986-06-01), Nitardy

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