Accession Number : ADD004568

Title :   Optimum Threshold Transmission Line Discriminator.

Descriptive Note : Patent,


Personal Author(s) : Ashley,James R ; Rast,Gustaf J , Jr ; Barley,Thomas A

Report Date : 11 Jan 1977

Pagination or Media Count : 7

Abstract : This report is on an optimum length transmission line discriminator circuit is disclosed which 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.

Descriptors :   *Patents, *Discriminators, *Phase detectors, *Demodulators, *Transmission lines, Frequency modulation, Tuning devices, Nulls(Amplitude), Broadband

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE