"These actions would ensure that low power auxiliary operations do not cause harmful interference to new public safety and commercial wireless services in the band," the agency said Thursday.
Most owners of the microphones are unaware that FCC rules require them to obtain a license.
The FCC rarely enforces the licensing requirements on the microphones because there have been so few complaints. The microphones are programmed to avoid television channels.
But the looming transition to digital broadcasting, which takes place Feb. 17, has forced the FCC to act.
Channels 52 through 69 in the UHF television band, currently used by broadcasters, will be vacated as they convert to digital broadcasting. The government sold that section of airwaves for $19 billion in the FCC's most successful auction in history.
Other parts of that spectrum will be used by paramedics, police and firefighters.
A half blood Thunder Moon will rise Tuesday. What is that and where can you see it?
By JON GAMBRELL Associated Press
US fears Iran seized a UAE-based oil tanker in the Strait of Hormuz after it turned off tracker over two days ago.
Lawmakers push for federal aid to wild blueberry industry