Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-08-30
1977-07-05
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57H, 324 57N, G01R 2700
Patent
active
040342859
ABSTRACT:
A superheterodyne noise measuring discriminator uses an optimum length trmission line which permits near carrier frequency modulation to be measured on a carrier frequency in a broad range from approximately two megahertz to two gigahertz with one set of components. A balanced phase detector, power dividers, attenuators coupled with the optimum length transmission line and balanced mixing of signal and reference signals at an IF level provide wide frequency range discrimination. This noise measuring discriminator operates over a wide frequency range with the only component changes being an input bandpass filter, the optimum length transmission line, adjustable phase shift device, and variable frequency local oscillator. The transmission line sections are easily changed by simply selecting proper line lengths which may be previously established. The optimum length transmission line can operate over several octaves of frequency range with analyzer degradation of less than three decibels. In measuring frequency modulation noise, carrier nulling in excess of 60 decibels is accomplished. After this carrier null has been accomplished, the discriminator circuit rejects incidental amplitude modulation on the test signal.
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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