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