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                                                                   DA 10-1053

                                                                June  9, 2010

                                             Enforcement Advisory No. 2010-04

                              WIRELESS MICROPHONES

    Wireless Microphones Are Not Permitted to Operate on Certain Frequencies
                              after June 12, 2010;

      Users are Urged to Check Their Equipment and Take Necessary Steps to
                               Ensure Compliance

   To avoid interference to critical public safety-related communications and
   wireless consumer services, the FCC's rules now prohibit the operation of
   wireless microphones and similar devices ("wireless microphones") in the
   700 MHz Band, i.e., the frequencies between 698 MHz and 806 MHz.

   What Should You Know?  When wireless microphones were designed originally,
   the frequencies they used were located between the frequencies utilized by
   television stations to broadcast programs.  With the completion of the DTV
   transition on June 12, 2009, television stations no longer use the
   frequencies in the 700 MHz Band for broadcasts. These frequencies are now
   being used by commercial providers of wireless services (such as wireless
   broadband services) and by public safety entities (such as police, fire,
   and emergency services).   Due in large part to the public safety
   operations in the band, and as of June 12, 2010, wireless microphone users
   must cease operating in the 700 MHz Band to ensure clear transmission of
   critical communications.

   Additionally, beginning June 12, 2010, FCC rules permit users to operate
   wireless microphones without a license on TV channels 2-51, excluding
   channel 37, but only at specified power levels (i.e., up to 50
   milliwatts). If they do so, however, these unlicensed wireless microphone
   users: (1) are prohibited from causing harmful interference, and (2) must
   accept any interference received from licensed operators. Finally, if a
   wireless microphone user causes harmful interference, the user may be
   required to cease operating the device and may not resume operation until
   the interference has been corrected.

   What Should You Do? There are two initial steps you should take:

     * First, you should check to see if your wireless microphone operates in
       the 700 MHz Band and is affected by the new rule. Some wireless
       microphones are marked with the frequency on which they operate. In
       addition, you can visit the FCC website at  where
       you will find a list of manufacturers of wireless microphones and
       associated model numbers. The list also includes product descriptions,
       and whether or not your device can be modified to comply with the
       rule. If your model is included on the list, it is a 700 MHz wireless
       microphone and cannot be used after June 12, 2010. If your
       manufacturer is not listed, please contact the FCC for assistance with
       determining whether your wireless microphone operates in the 700 MHz

     * Second, if you determine that your wireless microphone is operating in
       the 700 MHz Band, and therefore in violation of FCC rules, you should
       take any actions necessary to come into compliance. Additional
       information is available at

   What Happens if Users Do Not Comply with the New Rules?  This advisory
   emphasizes the importance of strict compliance with the rules and legal
   requirements described above and set forth in 47 C.F.R. S: 15.5. Among
   other things, violation of these rules and associated Commission orders
   may result in failed  communications by fire and police departments and
   other entities whose communications are vital to public safety efforts.
   Also, failure to comply with these new rules may, depending on the
   circumstances, subject the user to civil and criminal penalties, including
   but not limited to, substantial monetary forfeitures and seizure of

   Need more information?  For additional information regarding compliance
   and enforcement of the wireless microphone rules, you can contact Kathy
   Berthot of the Enforcement Bureau at (202) 418-7454, or Neal McNeil of the
   Enforcement Bureau at (202) 418-2408. For general information on the
   wireless microphone rules, you can contact the FCC at 1-888-CALL-FCC
   (1-888-225-5322) or visit:

   Media inquiries should be directed to Matthew Nodine,, (202) 418-1646.

   To request materials in accessible formats for people with disabilities
   (Braille, large print, electronic files, audio format), send an e-mail to or call the Consumer & Governmental Affairs Bureau at
   202-418-0530 (voice), (202) 418-0432 (TTY). You may also contact the
   Enforcement Bureau on its TTY line at (202) 418-1148 for further
   information about this Enforcement Advisory, or the FCC on its TTY line at
   1-888-Tell-FCC (1-888-835-5322) for further information about the wireless
   microphone rules.

                                         Issued by: Chief, Enforcement Bureau


   Similar devices to wireless microphones include wireless intercoms,
   wireless in-ear monitors ("IEM"), wireless audio instrument links, and
   wireless cueing equipment (aka "IFB"). See FCC Consumer Advisory,
   Operation of Wireless Microphones (and Similar Devices) in 700 MHz Band
   Prohibited After June 12, 2010,

                                  Page 2 of 2


                                  Page 1 of 2

                            FCC ENFORCEMENT ADVISORY

   Federal Communications Commission

   445 12th St., S.W.

   Washington, D.C. 20554

                                        News Media Information 202 / 418-0500


                                                          TTY: 1-888-835-5322