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Comment Window Opens for Asymmetrical Sidebands

IBiquity, NPR seek change for FM HD Radio

Should the FCC allow FM HD Radio stations to use asymmetrical sideband transmission more routinely?

Federal Register publication has triggered public comment filing deadlines on the question.

Currently, stations that wish to raise their digital power levels unevenly need a waiver of the FCC’s rules to do so.

Asymmetrical sidebands are a way for FMs to raise HD Radio power while minimizing interference to adjacent stations, according to proponents.

We’re reported that iBiquity Digital and NPR asked the commission to allow the change to make it easier for stations for more stations to raise power levels. They submitted results of drive tests conducted after asymmetrically raising digital power levels on WKLB(FM), Waltham, Mass., and WAMU(FM), Washington.

Comments are due to MM Docket 99-325 by Dec. 19 and replies by Jan. 3, 2012.

Improving Asymmetrical HD Sideband Approval Process (Oct. 2011)