NDLI: Radar Jams H-F Communications

Content Provider	IEEE Xplore Digital Library
Author	Mardiguian, Michel White, Donald R. J.
Copyright Year	1983
Description	Author affiliation: Don White Consultants, Inc., P. O. Box D, Gainesville, Virginia 22065 (Mardiguian, Michel; White, Donald R. J.)
Abstract	It has been well known for many years that UHF radar can jam cosite located 2-30 MHz communications systems. For the most part, the problem is due to unexpected spurious responses and audio rectification in the victim receiver. Not well known, however, is the fact that the primary mode of coupling may not be antenna-to-antenna interference but rather radar-antenna-to-victim-cable coupling. The paper presents case histories in support of the above together with analytical and hardware solutions. Generally this situation is not recognized because of the appearance of broadband interference across most of the tunable spectrum of the HF receiver. One solution is to use protective low-pass filters having a cut-off frequency sufficiently below that of the radar. Another solution is the selection of a coaxial cable from the victim antenna to its receiver having a considerably lower transfer impedance to eliminate the antenna-to-cable coupling mode. Also demonstrated is the inadequacy of present MIL-STD 461A/B, CS-04 limits in which a maximum out of band injection of 0 dBm is called for. It is shown that under certain conditions the available interference power may approach levels of + 30 dBm. This clearly demonstrates the need for increasing the MIL specifications limits where high-power radars and victim receivers are cosite located.
Starting Page	535
Ending Page	536
File Size	304456
Page Count	2
File Format	PDF
DOI	10.1109/MILCOM.1983.4794752
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1983-10-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Radar antennas Receiving antennas History Hardware Protection Low pass filters Cutoff frequency Coaxial cables Impedance
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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