Sec.  2.1507   Test frequencies.

   Testing of an EPIRB for compliance outside a shielded room on a distress
   frequency is prohibited, since this may interfere with emergency
   communications. Therefore, all compliance testing outside a shielded room
   should be conducted on one of the pairs of alternate frequencies specified
   below:

   121.600/243.200 MHz

   121.650/243.300 MHz

   121.700/243.400 MHz

   121.750/243.500 MHz

   121.800/243.600 MHz

   121.850/243.700 MHz

   121.900/243.800 MHz

   The above frequencies are to be used for limited testing of EPIRBs for
   compliance with FCC Rules, subject to the following conditions:

   (a) The testing shall not cause harmful interference to authorized
   communications on these frequencies.

   (b) The testing shall be coordinated with the nearest FCC district office.

   For simplicity, 121.5 MHz and 243 MHz will be used throughout this test
   procedure to indicate the alternate test frequency.