Accession Number : AD0654438

Title :   A PRACTICAL SYSTEM FOR MEASURING FM NOISE IN KLYSTRONS,

Corporate Author : TEXAS UNIV AUSTIN DEFENSE RESEARCH LAB

Personal Author(s) : Huggins,Larry Lee

Report Date : JAN 1959

Pagination or Media Count : 72

Abstract : The system for measuring FM noise in klystrons in which the time delay is introduced at microwave frequencies is practical and relatively straightforward. Since for most klystrons, the FM noise level in the frequency range of interest of doppler radar systems is relatively high, typically 60 to 70 db below the carrier at 10-kc, a 120 foot run of rectangular waveguide is suitable for the delay line. For systems in which it is desirable to measure FM noise at lower levels, the use of a circular waveguide delay line with its low attenuation characteristic is necessary. A reasonably accurate correlation between AM and FM noise can be made using the static characteristics of the klystron. The effect of feedback on AM and FM noise output of the klystron is as would be expected for an externally modulated perfect oscillator. (Author)

Descriptors :   (*KLYSTRONS, NOISE(RADAR)), FREQUENCY MODULATION, MEASUREMENT, MICROWAVE FREQUENCY, DELAY LINES

Subject Categories : Electrical and Electronic Equipment
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE