Sec.  15.219   Operation in the band 510–1705 kHz.

   (a) The total input power to the final radio frequency stage (exclusive of
   filament or heater power) shall not exceed 100 milliwatts.

   (b) The total length of the transmission line, antenna and ground lead (if
   used) shall not exceed 3 meters.

   (c) All emissions below 510 kHz or above 1705 kHz shall be attenuated at
   least 20 dB below the level of the unmodulated carrier. Determination of
   compliance with the 20 dB attenuation specification may be based on
   measurements at the intentional radiator's antenna output terminal unless
   the intentional radiator uses a permanently attached antenna, in which case
   compliance shall be deomonstrated by measuring the radiated emissions.