The FCC ban 700 MHz frequency

In order to avoid interference with important public safety facilities, such as communication and wireless consumer service equipment, the federal communications commission (FCC) regulation wireless microphone and similar equipment banned in 700 MHz frequency in operation.
At first the wireless microphone to design the frequency of use, is located in the television broadcast TV program used by simulation between frequency. As the U.S. in June 12, 2009 complete digital television (DTV) conversion, television no longer use 700 MHz (or 698 ~ 806 MHz) playing the program. These frequencies are now being public safety agencies (such as police, fire and emergency service) and wireless services business suppliers (such as the wireless broadband service) used.
Public security service to a large extent this frequency in the operation, but in the original analog TV on the radio frequency operation without