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FCC Again Rejects Petitions from C-band Users to Restrict UWB Device Emissions


The FCC, in a Third Memorandum Opinion and Order and Memorandum Opinion and Order (FCC 10-151), rejected petitions filed by the Satellite Industry Association and Cingular Wireless LLC (now AT&T) arguing that the waiver granted by the docket ET 04-352 Order would significantly increase the potential for interference to C-band fixed, satellite and cellular operation. Throughout the UWB proceedings, users of the 3.7-4.2 GHz C-band spectrum have expressed concerns about interference to their operations.

The FCC left its current rules, including the waiver to allow MB-COFDM UWB system emissions to be measured in its normal operating mode, intact. It rejected worst-case studies showing the potential for interference.

So far, I haven't any seen any advertisements or announcements for consumer UWB devices operating in the 3.7-4.2 GHz band. In the introduction for the Third Memorandum Opinion and Order, the FCC states, "This action terminates the above-captioned proceedings and thus provides certainty for the continued development of UWB equipment, including ground penetrating radars for underground imaging, through wall imaging systems, short-range high capacity data links and other applications." As these devices become more common, I hope the FCC's analysis of the interference to C-band reception is correct.

Doug Lung is one of America's foremost authorities on broadcast RF technology. He has been with NBC since 1985 and is currently vice president of broadcast technology for NBC/Telemundo stations.