Accession Number : ADD004567

Title :   Optimum Length Transmission Line Discriminator with Low Noise Detector.

Descriptive Note : Patent,


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

Report Date : 11 Jan 1977

Pagination or Media Count : 6

Abstract : This patent is on measurement apparatus using an optimum length transmission line discriminator 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.

Descriptors :   *Patents, *Discriminators, *Phase detectors, *Demodulators, *Transmission lines, Low noise, Tuning devices, Frequency modulation, Carrier frequencies, Microwave frequency

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE