§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 µW 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 µW. 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 §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
§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
§97.309(a) of this Part may be transmitted. The symbol rate must not exceed
1200 bauds. 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 §97.309(a) of this Part may be transmitted. The symbol rate must
not exceed 19.6 kilobauds. A RTTY, data or multiplexed emission using an
unspecified digital code under the limitations listed in §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 §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 §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 §97.309(a) of this Part or an unspecified digital code under the
limitations listed in §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 Class operator
license or a Technician Class operator license and who has received credit
for proficiency in telegraphy in accordance with the international
requirements 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° West longitude or south of 20° North latitude.
(12) Emission F8E may be transmitted.
(13) A data emission using an unspecified digital code under the limitations
listed in §97.309(b) of this Part also may be transmitted. The authorized
bandwidth is 100 kHz.
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