Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-01-26
1977-01-11
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2700
Patent
active
040029697
ABSTRACT:
Measurement apparatus using an optimum length transmission line discriminr is disclosed which allows near carrier frequency modulation to be measured in the very high and ultra high frequency regions without the use of a microwave type cavity resonator or a tuned resonant circuit. Amplitude modulation rejection through direct current biasing of a quadrature detector enhances near carrier FM measurement. Signal energy is routed through two channels to the quadrature detector. A reference channel provides attenuation and phase shifting, and a signal channel comprising the optimum length line provides FM discrimination. The phase detector is direct current biased to separate amplitude modulation noise from near carrier frequency modulation noise.
REFERENCES:
patent: 3675124 (1972-07-01), Ashley et al.
patent: 3693076 (1972-09-01), Nugent et al.
Ashley James R.
Barley Thomas A.
Rast, Jr. Gustaf J.
Bush Freddie M.
Edelberg Nathan
Gibson Robert P.
Krawczewicz Stanley T.
The United States of America as represented by the Secretary of
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