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Investigation Of Radio Frequency Interference To The Backup Emergency Communication Equipment
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Book Synopsis Investigation of Radio-Frequency Interference to the Backup Emergency Communication Equipment by : George Apostolakis
Download or read book Investigation of Radio-Frequency Interference to the Backup Emergency Communication Equipment written by George Apostolakis and published by . This book was released on 1973 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Investigation of Radio-frequency Interference to Backup Emergency Communication Equipment, Interim Report by :
Download or read book Investigation of Radio-frequency Interference to Backup Emergency Communication Equipment, Interim Report written by and published by . This book was released on 1973 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Radiofrequency Interference to the Backup Emergency Communication Equipment at the Elwood, New Jersey, Long-Range Radar Site by : George Apostolakis
Download or read book Investigation of Radiofrequency Interference to the Backup Emergency Communication Equipment at the Elwood, New Jersey, Long-Range Radar Site written by George Apostolakis and published by . This book was released on 1974 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to investigate radiofrequency interference (RFI) to the backup emergency communication (BUEC) equipment at operational long-range radar sites (LRRS). The investigative effort consisted of determining the sources of RFI, the frequency and intensity of RFI at various locations within the LRRS, and the BUEC frequencies affected by the RFI. Various methods of eliminating or reducing the effects of this RFI were studied. This report discusses the methodology and results of these RFI studies.
Book Synopsis Investigation of Shielding Methods and Materials for Reduction of Radiofrequency Interference to Backup Emergency Communication Equipment by : George C. Apostolakis
Download or read book Investigation of Shielding Methods and Materials for Reduction of Radiofrequency Interference to Backup Emergency Communication Equipment written by George C. Apostolakis and published by . This book was released on 1974 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Backup emergency communication (BUEC) equipment operation in the field has been reported to be impaired by radiofrequency interference (RFI). This RFI enters the BUEC transceiver via its antenna as well as directly through imperfections in the internal shielding of the transceiver itself. Methods of reducing the effect of this RFI by shielding of the antenna and the transceiver itself were studied at the Elwood, New Jersey, Long-Range Radar Site. It was found that the radome catwalk deck itself was an effective shield against both ultrahigh frequency (UHF) and very high frequency (VHF) RFI, and that moving the antenna radially inward from the protective rail of the catwalk provided effective shielding. Additionally, it was found that UHF RFI generated by the common digitizer (CD) was completely eliminated by a 6X6-foot copper mesh screen interposed between the BUEC antenna and the CD, however, this means did not provide complete shielding for VHF interference. Finally, direct RFI leakage into the transceiver appears to be through the front end of the transceiver. (Author).
Book Synopsis Investigation of Shielding Methods and Materials for Reduction of Radiofrequency Interference to Backup Emergency Communication Equipment by :
Download or read book Investigation of Shielding Methods and Materials for Reduction of Radiofrequency Interference to Backup Emergency Communication Equipment written by and published by . This book was released on 1974 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Backup emergency communication (BUEC) equipment operation in the field has been reported to be impaired by radiofrequency interference (RFI). This RFI enters the BUEC transceiver via its antenna as well as directly through imperfections in the internal shielding of the transceiver itself. Methods of reducing the effect of this RFI by shielding of the antenna and the transceiver itself were studied at the Elwood, New Jersey, Long-Range Radar Site. It was found that the radome catwalk deck itself was an effective shield against both ultrahigh frequency (UHF) and very high frequency (VHF) RFI, and that moving the antenna radially inward from the protective rail of the catwalk provided effective shielding. Additionally, it was found that UHF RFI generated by the common digitizer (CD) was completely eliminated by a 6X6-foot copper mesh screen interposed between the BUEC antenna and the CD, however, this means did not provide complete shielding for VHF interference. Finally, direct RFI leakage into the transceiver appears to be through the front end of the transceiver. (Author).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1979 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Government Reports Index written by and published by . This book was released on 1975 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Special Investigation Report by : United States. National Transportation Safety Board
Download or read book Special Investigation Report written by United States. National Transportation Safety Board and published by . This book was released on 1996 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transportation... Weekly Government Abstracts by :
Download or read book Transportation... Weekly Government Abstracts written by and published by . This book was released on 1974 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Government Reports Annual Index written by and published by . This book was released on 1974 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1975 with total page 2834 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations Publisher : ISBN 13 : Total Pages :1604 pages Book Rating :4.0/5 (18 download)
Book Synopsis Department of Transportation and Related Agencies Appropriations for 1995 by : United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations
Download or read book Department of Transportation and Related Agencies Appropriations for 1995 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations and published by . This book was released on 1994 with total page 1604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements by :
Download or read book Government Reports Announcements written by and published by . This book was released on 1974 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cumulative Title Index to United States Public Documents, 1789-1976 by : Daniel W. Lester
Download or read book Cumulative Title Index to United States Public Documents, 1789-1976 written by Daniel W. Lester and published by . This book was released on 1980 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Department of Transportation and Related Agencies Appropriations Bill, 1999 by : United States. Congress. Senate. Committee on Appropriations
Download or read book Department of Transportation and Related Agencies Appropriations Bill, 1999 written by United States. Congress. Senate. Committee on Appropriations and published by . This book was released on 1998 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Common Digitizer (FYQ-47) Radio Frequency Interference Measurements at the Elwood, New Jersey, Long Range Radar Site by : George C. Apostolakis
Download or read book Common Digitizer (FYQ-47) Radio Frequency Interference Measurements at the Elwood, New Jersey, Long Range Radar Site written by George C. Apostolakis and published by . This book was released on 1973 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Operating Long Range Radar Sites (LRRS) have reported that the Common Digitizer (CD) interferes with the Back-Up Emergency Communications (BUEC) equipments when the CD doors are OPENED for maintenance purposes. This problem was investigated. The investigation consisted of making Radio Frequency Interference (RFI) field strength measurements at various locations, both inside and outside the LRRS building as well as on the roof and radome catwalk. The measurements were made for various combinations of equipments being on with the CD doors both OPENED and CLOSED. It was determined that the CD with doors OPEN is the major source of RFI. The radiating source within the CD was traced to its core memory. With the CD doors CLOSED, RFI is reduced to negligible levels; furthermore, the roof of the building reduces the CD RFI to negligible proportions. (Modified author abstract).
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1975 with total page 1258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
