The FCC is considering allowing Wireless Multi-Channel Audio Systems (WMAS). This emerging wireless mic technology would enable more microphones per megahertz of spectrum, an efficiency that can greatly benefit music venues or convention centers with multiple performers or speakers, according to the Commission.
The Notice of Proposed Rulemaking adopted Thursday seeks public input on allowing WMAS on a licensed basis in frequency bands where wireless microphones already are currently authorized, including the TV bands, the 600 MHz duplex gap, and in portions of the 900 MHz, 1.4 GHz, and 7 GHz bands. These bands are shared with a range of other wireless services, including broadcasting, aeronautical activities, WiFi, and unlicensed operations that use white spaces to expand the availability of broadband.
The proposed changes are not intended to impact incumbent operations that share spectrum bands with wireless microphones. They would amend the Commission’s Part 74 licensed radio device rules—technically called low-power auxiliary station devices—to support efficient use of the spectrum and implement interference protection standards. The NPRM seeks comment on whether the Commission should also permit WMAS to operate on an unlicensed basis under the FCC’s Part 15 rules.
FCC Acting Chairwoman Jessica Rosenworcel said under proposed rule changes, WMAS could allow three times as many microphones to operate while putting the same amount of power over the air as a single wireless microphone does under the agency’s rules today. “That could mean that other spectrum interests using these bands might benefit from more efficient microphone operations, too. In fact, this new spectral efficiency could mean more opportunities for broadband technologies like white spaces and WiFi,” she said.
Comments to Docket 21-115 are due in 30 days, and reply comments are due in 60 days, after publication in the Federal Register.
Reader Interactions