Investigation of Radio-Frequency Interference to the Backup Emergency Communication Equipment.

摘要

Backup Emergency Communications (BUEC) equipment operation in the field has been reported impaired by radio-frequency interference (RFI). This RFI was investigated at the Elwood,New Jersey, ARSR-2radar site in April 1973. The investigation consisted of determining the interference frequencies from various sources which broke the squelch threshold of BUEC Very High Frequency (VHF) and Ultra High Frequency (UHF) transceivers with respect to the RFI sources. The investigation showed that two major sources of RFI were the Common Digitizer (CD) (With its doors open) and the radar. It was also found that the number of interference frequencies which break the squelch threshold diminish with increasing distance from the RFI source;that RFI from the CD shifts in distance and azimuth versus time;and that the RFI from the radar appears to come from the radar modulator, amplitron,and magnetron rather than from the radar antenna. (Author)