Accession Number : AD0785711

Title :   Intermodulation Study. (Intermodulation Products - Satellite Ground Antennas).

Descriptive Note : Final test rept. 1 Apr 72-1 Apr 73,

Corporate Author : PHILCO-FORD CORP PALO ALTO CALIF WESTERN DEVELOPMENT LABS DIV

Personal Author(s) : Rootsey,J. V. ; Gradisar,A. A. ; Bordenave,J. R. P.

Report Date : 24 AUG 1973

Pagination or Media Count : 166

Abstract : A description of tests, observations, problems and results of work performed to reduce the intermodulation products generated in the 5-horn feed of a 60-foot diameter parabolic antenna. The goal was to produce feed components that generated intermodulation products at levels below -140 dBm while subjected to 10 kW CW of total power in any combination of carriers. The receive band was 7.25 to 7.75 GHz; the transmit band was 7.9 to 8.4 GHZ. The study was conducted in three phases: The determination of intermodulation levels as a function of total power, proportional power between carrier, waveguide current densities, vacuum, and test configuration; Specific problems encountered in fabricating waveguide devices, specifically flanges, seams, materials, tuning methods, and the degeneration of these factors with time; An effort to obtain specific intermodulation-free components, particularly stable filters and flanges. (Author)

Descriptors :   *Antenna feeds, Intermodulation, Parabolic antennas, Horn antennas, X band, Satellite communications, Waveguides

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE