Intermodulation Study: (Intermodulation Products - Satellite Ground Antennas)
Technical Report,01 Apr 1972,01 Apr 1973
CGI GROUP INC QUEBEC (CANADA) QUEBEC Canada
Pagination or Media Count:
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.