Accession Number : ADD001296
Title : Pulsed Signal Phase Lock Spectral Purity Measuring Apparatus.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Ord,Eldon L ; Swyers,Stinson R
Report Date : 20 Aug 1974
Pagination or Media Count : 5
Abstract : The patent describes apparatus for measuring the spectral purity of a low duty cycle pulsed signal. A continuous wave (CW) reference signal is mixed with the pulsed signal forming an IF signal that is applied to one input of a phase detector. The output of the phase detector is amplified and applied to a sample and hold circuit which compresses the pulse spectrum of the pulse signal under test. After a time delay the sample and hold circuit provides an output to a voltage controlled oscillator which supplies a variable frequency CW signal to a second input of the phase detector to complete a phase locked loop allowing FM sideband detection. The sample and hold circuit output is passed, for example, to wave analyzers or through a threshold detector arranged to drive an indicator.
Descriptors : *Frequency analyzers, *Patents, Spectrum analyzers, Phase locked systems, Frequency, Stability, Pulses
Subject Categories : Test Facilities, Equipment and Methods
Distribution Statement : APPROVED FOR PUBLIC RELEASE