Sec. 97.307  Emission standards.

    (a) No amateur station transmission shall occupy more bandwidth than 
necessary for the information rate and emission type being transmitted, 
in accordance with good amateur practice.
    (b) Emissions resulting from modulation must be confined to the band 
or segment available to the control operator. Emissions outside the 
necessary bandwidth must not cause splatter or keyclick interference to 
operations on adjacent frequencies.
    (c) All spurious emissions from a station transmitter must be 
reduced to the greatest extent practicable. If any spurious emission, 
including chassis or power line radiation, causes harmful interference 
to the reception of another radio station, the licensee of the 
interfering amateur station is required to take steps to eliminate the 
interference, in accordance with good engineering practice.
    (d) The mean power of any spurious emission from a station 
transmitter or external RF power amplifier transmitting on a frequency 
below 30 MHz must not exceed 50 mW and must be at least 40 dB below the 
mean power of the fundamental emission. For a transmitter of mean power 
less than 5 W, the attenuation must be at least 30 dB. A transmitter 
built before April 15, 1977, or first marketed before January 1, 1978, 
is exempt from this requirement.
    (e) The mean power of any spurious emission from a station 
transmitter or external RF power amplifier transmitting on a frequency 
between 30-225 MHz must be at least 60 dB below the mean power of the 
fundamental. For a transmitter having a mean power of 25 W or less, the 
mean power of any spurious emission supplied to the antenna transmission 
line must not exceed 25 W and must be at least 40 dB below the 
mean power of the fundamental emission, but need not be reduced below 
the power of 10 W. A transmitter built before April 15, 1977, 
or first marketed before January 1, 1978, is exempt from this 
requirement.
    (f) The following standards and limitations apply to transmissions 
on the frequencies specified in Sec. 97.305(c) of this part.
    (1) No angle-modulated emission may have a modulation index greater 
than 1 at the highest modulation frequency.
    (2) No non-phone emission shall exceed the bandwidth of a 
communications quality phone emission of the same modulation type. The 
total bandwidth of an independent sideband emission (having B as the 
first symbol), or a multiplexed image and phone emission, shall not 
exceed that of a communications quality A3E emission.
    (3) Only a RTTY or data emission using a specified digital code 
listed in Sec. 97.309(a) of this part may be transmitted. The symbol 
rate must not exceed 300 bauds, or for frequency-shift keying, the 
frequency shift between mark and space must not exceed 1 kHz.
    (4) Only a RTTY or data emission using a specified digital code 
listed in Sec. 97.309(a) of this part may be transmitted. The symbol 
rate must not exceed 1200 bauds, or for frequency-shift keying, the 
frequency shift between mark and space must not exceed 1 kHz.
    (5) A RTTY, data or multiplexed emission using a specified digital 
code listed in Sec. 97.309(a) of this part may be transmitted. The 
symbol rate must not exceed 19.6 kilobauds. A RTTY, data or

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multiplexed emission using an unspecified digital code under the 
limitations listed in Sec. 97.309(b) of this part also may be 
transmitted. The authorized bandwidth is 20 kHz.
    (6) A RTTY, data or multiplexed emission using a specified digital 
code listed in Sec. 97.309(a) of this part may be transmitted. The 
symbol rate must not exceed 56 kilobauds. A RTTY, data or multiplexed 
emission using an unspecified digital code under the limitations listed 
in Sec. 97.309(b) of this part also may be transmitted. The authorized 
bandwidth is 100 kHz.
    (7) A RTTY, data or multiplexed emission using a specified digital 
code listed in Sec. 97.309(a) of this part or an unspecified digital 
code under the limitations listed in Sec. 97.309(b) of this part may be 
transmitted.
    (8) A RTTY or data emission having designators with A, B, C, D, E, 
F, G, H, J or R as the first symbol; 1, 2, 7 or 9 as the second symbol; 
and D or W as the third symbol is also authorized.
    (9) A station having a control operator holding a Novice or 
Technician Class operator license may only transmit a CW emission using 
the international Morse code.
    (10) A station having a control operator holding a Novice or 
Technician Class operator license may only transmit a CW emission using 
the international Morse code or phone emissions J3E and R3E.
    (11) Phone and image emissions may be transmitted only by stations 
located in ITU Regions 1 and 3, and by stations located within ITU 
Region 2 that are west of 130 deg. West longitude or south of 20 deg. 
North latitude.
    (12) Emission F8E may be transmitted.
    (13) A data emission using an unspecified digital code under the 
limitations listed in Sec. 97.309(b) also may be transmitted. The 
authorized bandwidth is 100 kHz.
[ 54 FR 25857 , June 20, 1989;  54 FR 30823 , July 24, 1989, as amended at 
 54 FR 39537 , Sept. 27, 1989;  60 FR 15688 , Mar. 27, 1995]