A widely used Bell System pyramidal horn‐reflector antenna, used in terrestrial radio relay systems, has been characterized over all space. We give the dB contours for principal (as opposed to cross‐polarized) measured radiation patterns and compare them to contours of calculated patterns for this antenna at 4 GHz. In addition, we present the contours for 6‐GHz measured principal patterns, describe the measurement method, and discuss the causes of departure of the measured from the calculated patterns.

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Absrmcr-Geostationary communications satellites have a potential for causing interference into terrestrial radio relay systems since present INTELSAT satellites as well as a number of U.S. domestic satellites transmit a downlink frequency in the 4 GHz common carrier band. Use has been made of recently measured spatial antenna radiation patterns of the AT&T KS15676 pyramidal horn-reflector antenna to calculate the interference noise into typical U.S: high density 4 GHz radio relay systems. The model employed uses the maximum allowed CCIR flux from the satellites so that the results are conservative since the flux from deployed satellite repeaters is normally below that level. Although certain cases such as east-west oriented existiug systems with one or more direct exposures may experience noticeable interference, no significant noise problem is foreseen from this source even when the geostationary orbit is populated as heavily as one communications satellite every 3".

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