Sec.  15.217   Operation in the band 160–190 kHz.

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

   (b) The total length of the transmission line, antenna, and ground lead (if
   used) shall not exceed 15 meters.

   (c) All emissions below 160 kHz or above 190 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 demonstrated by measuring the radiated emissions.