Manufacturers of outdoor equipment filed for equipment certification under both regulations, taking advantage of higher antenna gain from Part 15.247 along with broader spectrum from Part 15.407.Įventually, concerns about Terminal Doppler Weather Radar (TDWR) interference prompted an FCC investigation which ultimately resulted in the disallowance of the TDWR band and unification of the competing 5 GHz regulations in May of this year. Throughout the 1980s and 1990s, both Part 15.407 (in the 25 bands) and Part 15.247 (in the 5725-5850 band) governed the spectrum limitations for point-to-point operations in 5 GHz. The FCC’s regulations governing the outdoor use of the 5 GHz spectrum have a complex history. If the FCC does not act decisively to change the current OOBE limits, Mimosa believes that the regulations will jeopardize the ability of wireless Internet providers to reach underserved communities with reliable Internet access. In addition, the new rules prohibit the use of the entire band for transmission, and instead require radios to avoid the edges of the band, severely limiting the amount of spectrum available for use. Despite the fact that the 5 GHz band is one of the few bands capable of supporting long distance Wi-Fi connections, the power limits and antenna sizes that are required for the optimal use of those links are illegal under the current FCC limits. Today we submitted additional comments to further underscore our position. In June, Mimosa submitted its Petition to the FCC, urging them to revise the OOBE limits via an effective compromise proposal. As many of you know, earlier this year the FCC issued new regulations which drastically restricted the legal out-of-band emission (OOBE) limits in the U-NII-1 and U-NII-3 spectrum bands.
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