§  30.404   Emission limits.

   (a) The mean power of emissions must be attenuated below the mean
   output power of the transmitter in accordance with the following
   schedule:

   (1) When using transmissions other than those employing digital
   modulation techniques:

   (i) 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 decibels;

   (ii) 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 decibels;

   (iii) On any frequency removed from the assigned frequency by more than
   250 percent of the authorized bandwidth: At least 43 + 10 Log10 (mean
   output power in watts) decibels, or 80 decibels, whichever is the
   lesser attenuation.

   (2) When using transmissions employing digital modulation techniques in
   situations not covered in this section:

   (i) In any 1 MHz band, the center frequency of which is removed from
   the assigned frequency by more than 50 percent up to and including 250
   percent of the authorized bandwidth: As specified by the following
   equation but in no event less than 11 decibels:

   A = 11 + 0.4(P−50) + 10 Log10 B. (Attenuation greater than 56 decibels
   or to an absolute power of less than −13 dBm/1MHz is not required.)

   (ii) In any 1 MHz band, the center frequency of which is removed from
   the assigned frequency by more than 250 percent of the authorized
   bandwidth: At least 43 + 10 Log10 (the mean output power in watts)
   decibels, or 80 decibels, whichever is the lesser attenuation. The
   authorized bandwidth includes the nominal radio frequency bandwidth of
   an individual transmitter/modulator in block-assigned bands. Equipment
   licensed prior to April 1, 2005 shall only be required to meet this
   standard in any 4 kHz band.

   (iii) The emission mask in paragraph (a)(2)(i) of this section applies
   only to the band edge of each block of spectrum, but not to subchannels
   established by licensees. The value of P in the equation is the
   percentage removed from the carrier frequency and assumes that the
   carrier frequency is the center of the actual bandwidth used. The
   emission mask can be satisfied by locating a carrier of the subchannel
   sufficiently far from the channel edges so that the emission levels of
   the mask are satisfied. The emission mask shall use a value B
   (bandwidth) of 40 MHz, for all cases even in the case where a narrower
   subchannel is used (for instance the actual bandwidth is 10 MHz) and
   the mean output power used in the calculation is the sum of the output
   power of a fully populated channel. For block assigned channels, the
   out-of-band emission limits apply only outside the assigned band of
   operation and not within the band.

   (b) [Reserved]