Accession Number : ADD004872

Title :   Superheterodyne Noise Measuring Discriminators.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

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

Report Date : 05 Jul 1977

Pagination or Media Count : 8

Abstract : A superheterodyne noise measuring discriminator uses an optimum length transmission line which permits near carrier frequency modulation to be measured on a carrier frequency in a broad range from approximately two megahertz to two gigahertz with one set of components. A balanced phase detector, power dividers, attenuators coupled with the optimum length transmission line and balanced mixing of signal and reference signals at an IF level provide wide frequency range discrimination. This noise measuring discriminator operates over a wide frequency range with the only component changes being an input bandpass filter, the optimum length transmission line, adjustable phase shift device, and variable frequency local oscillator. The transmission line sections are easily changed by simply selecting proper line lengths which may be previously established. The optimum length transmission line can operate over several octaves of frequency range with analyzer degradation of less than three decibels. In measuring frequency modulation noise, carrier nulling in excess of 60 decibels is accomplished.

Descriptors :   *Patents, *Discriminators, *Noise(Radio), Superheterodyne receivers, Measuring instruments, Transmission lines, Phase detectors, Mixers(Electronics)

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE