Accession Number : ADD000775
Title : Two-Coupler Microwave Frequency Discriminator with Internal Adjustable Delay Line.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C
Personal Author(s) : McLaughlin,Robert L
Report Date : 29 Apr 1975
Pagination or Media Count : 3
Abstract : The patent describes a two-coupler microwave frequency discriminator having an adjustable delay line. The signal to be demodulated is fed to one of the input ports of a 3 db coupler and its inphase output is fed to a fixed external delay while the quadrature output is fed to an internal adjustable delay line. The two delay circuits are fed to the input ports of a second 3 db coupler and the outputs thereof are connected one each to matched detecting diodes. A pair of video amplifiers are each fed by both diodes producing an amplified modulated signal and a frequency modulated signal. The internal adjustable delay line includes a pair of printed circuit boards opposing each other with one fixed in the housing and the other slidably mounted within the housing and driven longitudinally by an attached slide screw that protrudes to the outside of the housing.
Descriptors : *Discriminators, *Patents, Microwave equipment, Delay lines, Carrier waves, Strip transmission lines, Waveguide couplers, Tuning devices
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE