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
040029700
ABSTRACT:
An optimum length transmission line discriminator circuit is disclosed wh provides for measurement of near carrier frequency modulation in the microwave region. An optimum length of transmission line within the discriminator is instrumental in providing the discrimination function. The transmission line discriminator possesses the same basic circuit properties required to provide measurement and affords a broader range of operation than established microwave cavity methods can feasibly provide. The optimized transmission line length provides for maximum efficiency from the transmission line parameters over a wide frequency range. In measuring frequency modulation noise, carrier nulling in excess of 60 decibels is accomplished with a slide screw tuner in conjunction with the optimized length line. This null is relatively insensitive to environmental effects. After this carrier null has been accomplished, the discriminator circuit rejects incidental amplitude modulation on the test signal, and is not restricted by burnout power ratings of crystals within the phase detector.
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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