§ 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) For transmitters installed after January 1, 2003, the mean power of any
   spurious emission from a station transmitter or external RF power amplifier
   transmitting on a frequency below 30 MHz must be at least 43 dB below the
   mean power of the fundamental emission. For transmitters installed on or
   before January 1, 2003, 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 installed on or before January 1, 2003, 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, 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 § 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, 9 or X 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 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) also may be transmitted. The authorized bandwidth is
   100 kHz.

   (14) In the 60 m band:

   (i) A station may transmit only phone, RTTY, data, and CW emissions using
   the emission designators and any additional restrictions that are specified
   in the table below (except that the use of a narrower necessary bandwidth is
   permitted):

   60 M Band Emission Requirements
  Emission type Emission designator               Restricted to:
  Phone         2K80J3E             Upper sideband transmissions (USB).
  Data          2K80J2D             USB (for example, PACTOR-III).
  RTTY          60H0J2B             USB (for example, PSK31).
  CW            150HA1A             Morse telegraphy by means of on-off keying.

   (ii) The following requirements also apply:

   (A) When transmitting the phone, RTTY, and data emissions, the suppressed
   carrier frequency may be set as specified in § 97.303(h).

   (B) The control operator of a station transmitting data or RTTY emissions
   must  exercise care to limit the length of transmission so as to avoid
   causing harmful interference to United States Government stations.

   [ 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;  65 FR 6550 , Feb. 10,
   2000;  69 FR 24997 , May 5, 2004;  77 FR 5412 , Feb. 3, 2012;  79 FR 35291 , June
   20, 2014]

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