§ 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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