Accession Number : AD0771234

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

Descriptive Note : Interim rept.,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Apostolakis,George ; Riley,John ; Moss,Arthur

Report Date : DEC 1973

Pagination or Media Count : 83

Abstract : 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-2 radar 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)

Descriptors :   *Communication equipment, *Radiofrequency interference, Communication and radio systems, Air traffic control systems, Radar equipment, Very high frequency, Ultrahigh frequency, Transmitter receivers

Subject Categories : Air Navigation and Guidance
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE