Date: Mon, 28 Oct 2002 22:02:27 -0800 To: w6vr@amsat.org From: Robert Gonsett <rgonsett@connectnet.com> Subject: CGC #546
------------------------------------------------------------------ THE CGC COMMUNICATOR CGC #546 Tuesday, October 29, 2002 Robert F. Gonsett, W6VR, Editor Copyright 2002, Communications General Corporation (CGC) ------------------------------------------------------------------
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FCC INVESTIGATES NOISE IN THE GPS BANDS
The FCC has measured the levels of ambient radio noise that exist in the GPS frequency bands at a variety of indoor and outdoor settings, primarily commercial in nature. The results show that the GPS frequency bands generally have very low levels of ambient radio noise in outdoor environments. In contrast, indoor settings have levels of noise well above the new Ultra- Wideband ("UWB") emission limits. (Conclusion: Perhaps the UWB emission limits can be relaxed.)
The RFI found was attributed to a variety of common electrical devices, such as personal computers, peripherals and electrical machinery. The FCC Laboratory measured the emissions from a number of RF emitters, such as personal computers, hairdryers and electric drills. These products generally had emissions above the limits established for UWB devices, but well below the current Part 15 emission limits for digital and other radio frequency gear.
http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-02-2786A1.doc
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===== e-mail: k1ki@arrl.org ARRL New England Division Director http://www.arrl.org/ Tom Frenaye, K1KI, P O Box J, West Suffield CT 06093 Phone: 860-668-5444