Oscillator, and method of adjusting an oscillator to a standard

Details Oscillator, and method of adjusting an oscillator to a standard Oscillator, and method of adjusting an oscillator to a standard

1977-10-11

1979-05-22

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

331 44, H03B 1900, H04N 962

Patent

active

041562526

ABSTRACT:
The frequency of an oscillator which nominally is to oscillate at 3375 kilohertz can be adjusted conveniently by tuning a color television receiving set to a color program transmitted by a television network. The output of the oscillator to be adjusted is coupled to the color television set such as at the chroma input terminal of the color-demodulation circuit. The oscillator is adjusted until a colored vertical stripe pattern appears on the screen of the set and either appears stationary or drifts to the right one stripe width in about 9.31 seconds.
An oscillator, adapted to oscillate at 3375 kilohertz, can generate 111 different integral (i.e., Hertz) frequencies in association with appropriate frequency dividing means.

REFERENCES:
patent: 3958269 (1976-05-01), Davis
QST pp. 33-40, May 1965.
"Frequency Standard Hides in Every Color TV Set", Davis, Electronics 5/10/71, pp. 96-98.
"Calibrating Crystal Oscillators with TV Color Reference Signals", Davis, Electronics 5/20/75.
Radio-Electronics pp. 74-76, 108 Robbins, Sep. 1976.

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