47 CFR §80.211

1. (a)The mean power when using emissions H3E, J3E and R3E:
   1. (1)On any frequency removed from the assigned frequency by more than 50 percent up to and including 150 percent of the authorized bandwidth:
   2. (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
   3. (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.
2. (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:
   1. (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;
   2. (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
   3. (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.
3. (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:
   1. (1)125 dB at 1525.0 MHz, increasing linearly to 90 dB at 1612.5 MHz;
   2. (2)90 dB at 1612.5 MHz increasing linearly to 60 dB at 1624.0 MHz;
   3. (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;
   4. (4)60 dB at 1650.0 MHz decreasing linearly to 90 dB at 1662.5 MHz;
   5. (5)90 dB at 1662.5 MHz decreasing linearly to 125 dB at 1752.5 MHz; and
   6. (6)125 dB outside above range, except for harmonics which must comply with (b)(3) of this section.
4. (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:
   1. (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;
   2. (2)On any frequency removed from the assigned frequency by more than 100 percent of the authorized bandwidth: at least 30 dB.
5. (e)The mean power of EPIRBs operating on 121.500 MHz, 243.000 MHz and 406.0-406.1 MHz must be as follows:
   1. (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;
   2. (2)On any frequency removed from the assigned frequency by more than 100 percent: at least 30 dB.
6. (f)The mean power when using emissions other than those in paragraphs (a), (b), (c) and (d) of this section:
   1. (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;
   2. (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
   3. (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.