{"data":{"id":"us/47-cfr-80.211","jurisdiction":"us","citation":"47 CFR 80.211","heading":"Emission limitations.","body":"The emissions must be attenuated according to the following schedule.\n(a) The mean power when using emissions H3E, J3E and R3E:\n(1) On any frequency removed from the assigned frequency by more than 50 percent up to and including 150 percent of the authorized bandwidth:\nat least 25 dB for transmitters installed before February 1, 1992,\nat least 28 dB for transmitters installed on or after February 1, 1992;\n(2) On any frequency removed from the assigned frequency by more than 150 percent up to and including 250 percent of the authorized bandwidth: At least 35 dB; and\n(3) On any frequency removed from the assigned frequency by more than 250 percent of the authorized bandwidth: At least 43 plus 10log10 (mean power in watts) dB.\n(b) For transmitters operating in the band 1626.5-1646.5 MHz. In any 4 kHz band the mean power of emissions shall be attenuated below the mean output power of the transmitter as follows:\n(1) Where the center frequency is removed from the assigned frequency by more than 50 percent up to and including 100 percent of the authorized bandwidth: At least 25 dB;\n(2) Where the center frequency is removed from the assigned frequency by more than 100 percent up to 250 percent of the authorized bandwidth: At least 35 dB; and\n(3) On any frequency removed from the assigned frequency by more than 250 percent of the authorized bandwidth: At least 43 plus 10log10 (mean power in watts) dB.\n(c) In any 4 kHz band the peak power of spurious emissions and noise at the input to the transmit antenna must be attenuated below the peak output power of the station as follows:\n(1) 125 dB at 1525.0 MHz, increasing linearly to 90 dB at 1612.5 MHz;\n(2) 90 dB at 1612.5 MHz increasing linearly to 60 dB at 1624.0 MHz;\n(3) 90 dB from 1624.0 MHz to 1650.0 MHz, except at frequencies near the transmitted carrier where the requirements of paragraphs (b)(1) through (3) of this section, apply;\n(4) 60 dB at 1650.0 MHz decreasing linearly to 90 dB at 1662.5 MHz;\n(5) 90 dB at 1662.5 MHz decreasing linearly to 125 dB at 1752.5 MHz; and\n(6) 125 dB outside above range, except for harmonics which must comply with (b)(3) of this section.\n(d) The mean power of emissions from radiotelephone survival craft transmitters, 9 GHz search and rescue transponders, and radiotelegraph survival craft transmitters must be attenuated below the mean output power of the transmitter as follows:\n(1) On any frequency removed from the assigned frequency by more than 50 percent, up to and including 100 percent of the authorized bandwidth: at least 25 dB;\n(2) On any frequency removed from the assigned frequency by more than 100 percent of the authorized bandwidth: at least 30 dB.\n(e) The mean power of EPIRBs operating on 121.500 MHz, 243.000 MHz and 406.0-406.1 MHz must be as follows:\n(1) On any frequency removed from the assigned frequency by more than 50 percent, up to and including 100 percent of the authorized bandwidth: At least 25 dB;\n(2) On any frequency removed from the assigned frequency by more than 100 percent: at least 30 dB.\n(f) The mean power when using emissions other than those in paragraphs (a), (b), (c) and (d) of this section:\n(1) On any frequency removed from the assigned frequency by more than 50 percent up to and including 100 percent of the authorized bandwidth: At least 25 dB;\n(2) On any frequency removed from the assigned frequency by more than 100 percent up to and including 250 percent of the authorized bandwidth: At least 35 dB; and\n(3) On any frequency removed from the assigned frequency by more than 250 percent of the authorized bandwidth: At least 43 plus 10log10 (mean power in watts) dB.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES","PART 80—STATIONS IN THE MARITIME SERVICES","Subpart E—General Technical Standards"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-47.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:28Z","sha256":"bb0a785be2a77f5306d5990e6499247870e63b2b744570016f10f948ff114614","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-80.209","next":"us/47-cfr-80.213"},"notice":"GroundRules: Original legal text. Not legal advice."}