47 C.F.R. § 15.217 Operation in the band 160–190 kHz.
Title 47 - Telecommunication
(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.
Title 47: Telecommunication
PART 15—RADIO FREQUENCY DEVICES
Subpart C—Intentional Radiators
Radiated Emission Limits, Additional Provisions
§ 15.217 Operation in the band 160–190 kHz.
