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WISPA is sending this TDWR update to all listserv subscribers to inform
and update all users of the 5.4 GHz band. What TDWRs Do - TDWR systems are airport weather radars that provide information about severe weather conditions. This information is used by air traffic controllers and by pilots to maintain safe flight even in the presence of the severe weather. TDWR Frequencies - TDWR systems operate from 5600 to 5650 MHz. This is part of the 5.470 to 5.725 band also used by WISPs and others for outdoor networks, TDWR systems have been experiencing interference at several locations around the U.S. As a result, the Federal Aviation Administration (FAA) has prevailed on the FCC to suspend all new equipment authorizations for the 5.470 to 5.725 GHz band. Previously certified equipment is still available but no new equipment has been certified in over a year. New equipment certifications will NOT begin again until the FAA, NTIA, FCC and equipment and chip manufacturers can agree on new certification standards. WISPA has been working with all of these parties for the last 9 months to help address and solve the interference problem AND to help begin new equipment certification again. TDWR Database - WISPA has partnered with Spectrum Bridge to provide an online TDWR Database named the UDIA (U-NII Device Interference Advisor) <http://spectrumbridge.com/products-services/spectrumsharing/interference-advisor.aspx>. The database is now up and running. It provides a lookup function so you can see if you are close enough to a TDWR site to interference with the site. Using the UDIA Database to look up the location of TDWR sites is free. You do not need to register or identify yourself to look up sites. You can use the search page <http://spectrumbridge.com/udia/search.aspx to determine if your base station is within 35 km of a TDWR site. If you are within 35 km, you are asked to avoid using frequencies that are within 30 MHz (+ and -) of the frequency used by that site. Unlicensed operators are required to avoid interfering with licensed stations and TDWRs are licensed systems. Maintaining a 30 MHz frequency separation from a TDWR system assures that you will not interfere with the TDWR. If you choose, you may also register your base station information in the TDWR Database. Registration is free and voluntary however the advantage of registration is that when there is an interference problem in your area (remember, there are already multiple problem areas around the county) the FAA and FCC will know that you are likely NOT the cause of the problem. For more information, please check out the database and take it for a "test drive". You can also see WISPA's TDWR page at <http://www.wispa.org/?page_id=2388>. Your questions are welcomed either on-list of off-list. Also, please advise if you find any errors in the database information so corrections can be made promptly. WISPA, the FAA and the FCC thank-you for your assistance. Jack Unger Chair - WISPA FCC Committee 818-227-4220 -- Jack Unger - President, Ask-Wi.Com, Inc. Next Wireless 101 Training - San Jose - September 23 <http://www.moonblinkwifi.com/pd-wireless-101-training-on-september-23---24.cfm> Serving the Broadband Wireless, Networking and Telecom Communities since 1993 www.ask-wi.com 818-227-4220 [email protected] |
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