§  95.635   Unwanted radiation.

   (a) In addition to the procedures in part 2, the following requirements
   apply to each transmitter both with and without the connection of all
   attachments acceptable for use with the transmitter, such as an
   external speaker, microphone, power cord, antenna, etc.

   (b) The power of each unwanted emission shall be less than TP as
   specified in the applicable paragraphs listed in the following table:
   Transmitter Emission type Applicable paragraphs (b)
   GMRS A1D, A3E, F1D, G1D, F3E, G3E with filtering (1), (3), (7).
      A1D, A3E, F1D, G1D, F3E, G3E without filtering (5), (6), (7).
      H1D, J1D, R1D, H3E, J3E, R3E (2), (4), (7).
   FRS F3E with filtering (1), (3), (7).
   R/C:
   27 MHz As specified in § 95.631(b) (1), (3), (7).
   72–76 MHz As specified in § 95.631(b) (1), (3), (7), (10), (11), (12).
   CB A1D, A3E (1), (3), (8), (9).
      H1D, J1D, R1D, H3E, J3E, R3E (2), (4), (8), (9).
      A1D, A3E type accepted before September 10, 1976 (1), (3), (7).
      H1D, J1D, R1D, H3E, J3E, R3E type accepted before September 10, 1986
   (2), (4), (7).
   LPRS As specified in paragraph (c).
   MedRadio As specified in paragraph (d).
   DSRCS–OBU As specified in paragraph (f) of this section.

   (1) At least 25 dB (decibels) on any frequency removed from the center
   of the authorized bandwidth by more than 50% up to and including 100%
   of the authorized bandwidth.

   (2) At least 25 dB on any frequency removed from the center of the
   authorized bandwidth by more than 50% up to and including 150% of the
   authorized bandwidth.

   (3) At least 35 dB on any frequency removed from the center of the
   authorized bandwidth by more than 100% up to and including 250% of the
   authorized bandwidth.

   (4) At least 35 dB on any frequency removed from the center of the
   authorized bandwidth by more than 150% up to and including 250% of the
   authorized bandwidth.

   (5) At least 83 log[10](f[d]/5) dB on any frequency removed from the
   center of the authorized bandwidth by a displacement frequency (f[d]in
   kHz), of more than 5 kHz up to and including 10 kHz.

   (6) At least 116 log[10](f[d]/6.1) dB, or if less, 50 + 10 log[10](T)
   dB, on any frequency removed from the center of the authorized
   bandwidth by a displacement frequency (f[d]in kHz), of more than 10 kHz
   up to and including 250% of the authorized bandwidth.

   (7) At least 43 + 10 log[10](T) dB on any frequency removed from the
   center of the authorized bandwidth by more than 250%.

   (8) At least 53 + 10 log[10](T) dB on any frequency removed from the
   center of the authorized bandwidth by more than 250%.

   (9) At least 60 dB on any frequency twice or greater than twice the
   fundamental frequency.

   (10) At least 45 dB on any frequency removed from the center of the
   authorized bandwidth by more than 100% up to and including 125% of the
   authorized bandwidth.

   (11) At least 55 dB on any frequency removed from the center of the
   authorized bandwidth by more than 125% up to and including 250% of the
   authorized bandwidth.

   (12) At least 56 + 10 log[10](T) dB on any frequency removed from the
   center of the authorized bandwidth by more than 250%.

   (c) For transmitters designed to operate in the LPRS, emissions shall
   be attenuated in accordance with the following:

   (1) Emissions for LPRS transmitters operating on standard band channels
   (25 kHz) shall be attenuated below the unmodulated carrier in
   accordance with the following:

   (i) Emissions 12.5 kHz to 22.5 kHz away from the channel center
   frequency: at least 30 dB; and

   (ii) Emissions more than 22.5 kHz away from the channel center
   frequency: at least 43 + 10log(carrier power in watts) dB.

   (2) Emissions for LPRS transmitters operating on extra band channels
   (50 kHz) shall be attenuated below the unmodulated carrier in
   accordance with the following:

   (i) Emissions 25 kHz to 35 kHz from the channel center frequency: at
   least 30 dB; and

   (ii) Emissions more than 35 kHz away from the channel center frequency:
   at least 43 + 10log(carrier power in watts) dB.

   (3) Emissions for LPRS transmitters operating on narrowband channels (5
   kHz) shall be attenuated below the power (P) of the highest emission,
   measured in peak values, contained within the authorized bandwidth (4
   kHz) in accordance with the following:

   (i) On any frequency within the authorized bandwidth: Zero dB;

   (ii) On any frequency removed from the center of the authorized
   bandwidth by a displacement frequency (f[d]in kHz) of more than 2 kHz
   up to and including 3.75 kHz: The lesser of 30 + 20(f[d]-2) dB, or 55 +
   10 log(P), or 65 dB; and

   (iii) On any frequency beyond 3.75 kHz removed from the center of the
   authorized bandwidth: At least 55 + 10 log(P) dB.

   (4) Emissions from AMTS transmitters using a single 250 kHz channel
   shall be attenuated below the unmodulated carrier in accordance with
   the following:

   (i) Emissions from 125 kHz to 135 kHz away from the channel center
   frequency; at least 30 dB; and

   (ii) Emissions more than 135 kHz away from the channel center
   frequency; at least 43 + 10log(carrier power in watts) dB.

   (d) For transmitters designed to operate in the MedRadio service,
   emissions shall be attenuated in accordance with the following:
   (paragraphs (d)(1) through (d)(5) pertain to MedRadio transmitters
   operating in the 402–405 MHz band; paragraphs (d)(6) through (d)(10)
   pertain to MedRadio transmitters operating in the 401–402 MHz or
   405–406 MHz bands).

   (1) Emissions from a MedRadio transmitter more than 250 kHz outside of
   the 402–405 MHz band shall be attenuated to a level no greater than the
   following field strength limits:
   Frequency
   (MHz) Field strength
   (µV/m) Measurement
   distance
   (m)
          30–88         100 3
          88–216        150 3
          216–960       200 3
          960 and above 500 3

   Note—At band edges, the tighter limit applies.

   (2) The emission limits shown in the table of paragraph (d)(1) are
   based on measurements employing a CISPR quasi-peak detector except that
   above 1 GHz, the limit is based on measurements employing an average
   detector. Measurements above 1 GHz shall be performed using a minimum
   resolution bandwidth of 1 MHz. See also § 95.605.

   (3) The emissions from a MedRadio transmitter must be measured to at
   least the tenth harmonic of the highest fundamental frequency designed
   to be emitted by the transmitter.

   (4) Emissions within the 402–405 MHz band more than 150 kHz away from
   the center frequency of the spectrum the transmission is intended to
   occupy will be attenuated below the transmitter output power by at
   least 20 dB. Compliance with this limit is based on the use of
   measurement instrumentation employing a peak detector function with an
   instrument resolution bandwidth approximately equal to 1.0 percent of
   the emission bandwidth of the device under measurement.

   (5) Emissions 250 kHz or less that are above or below the 402–405 MHz
   band will be attenuated below the maximum permitted output power by at
   least 20 dB. Compliance with this limit is based on the use of
   measurement instrumentation employing a peak detector function with an
   instrument resolution bandwidth approximately equal to 1.0 percent of
   the emission bandwidth of the device under measurement.

   (6) Emissions from a MedRadio transmitter operating in the 401–402 MHz
   or 405–406 MHz bands that are more than 100 kHz outside of either the
   401–402 MHz or 405–406 MHz bands, and all emissions from such
   transmitter in the band 406.000–406.100 MHz shall be attenuated to a
   level no greater than the following field strength limits:
   Frequency (MHz) Field strength
   (µV/m) Measurement
   distance (m)
   30–88 100 3
   88–216 150 3
   216–960 200 3
   960 and above 500 3

   Note—At band edges, the tighter limit applies.

   (7) The emission limits shown in paragraph (d)(6) are based on
   measurements employing a CISPR quasi-peak detector except that above 1
   GHz, the limit is based on measurements employing an average detector.
   Measurements above 1 GHz shall be performed using a minimum resolution
   bandwidth of 1 MHz. See also § 95.605.

   (8) The emissions from a MedRadio transmitter operating in the MedRadio
   bands (between 401–402 MHz or 405–406 MHz) must be measured to at least
   the tenth harmonic of the highest fundamental frequency designed to be
   emitted by the transmitter.

   (9) Emissions between 401–401.85 MHz or 405–406 MHz within the MedRadio
   bands that are more than 50 kHz away from the center frequency of the
   spectrum the transmission is intended to occupy (or more than 75 kHz
   away from the center frequency of MedRadio transmitters operating
   between 401.85–402 MHz) shall be attenuated below the transmitter
   output power by at least 20 dB. Compliance with this limit is based on
   the use of measurement instrumentation employing a peak detector
   function with an instrument resolution bandwidth approximately equal to
   1.0 percent of the emission bandwidth of the device under measurement.

   (10) Emissions 100 kHz or less below 401 MHz or above 406 MHz shall be
   attenuated below the maximum permitted output power by at least 20 dB.
   Compliance with this limit is based on the use of measurement
   instrumentation employing a peak detector function with an instrument
   resolution bandwidth approximately equal to 1.0 percent of the emission
   bandwidth of the device under measurement.

   (e) For transmitters designed to operate in the MURS, transmitters
   shall comply with the following:
   Frequency Mask with audio low pass filter Mask without audio low pass
   filter
   151.820 MHz, 151.880 MHz and 151.940 MHz (1) (1)
   154.570 MHz and 154.600 MHz (2) (3)

   (1) Emission Mask 1 —For transmitters designed to operate with a 12.5
   kHz channel bandwidth, any emission must be attenuated below the power
   (P) of the highest emission contained within the authorized bandwidth
   as follows:

   (i) On any frequency from the center of the authorized bandwidth f[o]to
   5.625 kHz removed from fo: Zero dB.

   (ii) On any frequency removed from the center of the authorized
   bandwidth by a displacement frequency (f[d]in kHz) of more than 5.625
   kHz but no more than 12.5 kHz: at least 7.27(f[d]−2.88 kHz) dB.

   (iii) On any frequency removed from the center of the authorized
   bandwidth by a displacement frequency (f[d]in kHz) of more than 12.5
   kHz: at least 50 + 10 log (P) dB or 70 dB, whichever is the lesser
   attenuation.

   (2) Emission Mask 2 —For transmitters designed to operate with a 25 kHz
   channel bandwidth that are equipped with an audio low-pass filter, the
   power of any emission must be below the unmodulated carrier power (P)
   as follows:

   (i) On any frequency removed from the assigned frequency by more than
   50 percent, but not more than 100 percent of the authorized bandwidth:
   at least 25 dB.

   (ii) On any frequency removed from the assigned frequency by more than
   100 percent, but not more than 250 percent of the authorized bandwidth:
   at least 35 dB.

   (iii) On any frequency removed from the assigned frequency by more than
   250 percent of the authorized bandwidth: at least 43 + 10 log (P) dB.

   (3) Emission Mask 3 —For transmitters designed to operate with a 25 kHz
   channel bandwidth that are not equipped with an audio low-pass filter,
   the power of any emission must be attenuated below the unmodulated
   carrier output power (P) as follows:

   (i) On any frequency removed from the center of the authorized
   bandwidth by a displacement frequency (f[d]in kHz) of more than 5 kHz,
   but not more than 10 kHz: at least 83 log (f[d]/5) dB.

   (ii) On any frequency removed from the center of the authorized
   bandwidth by a displacement frequency (f[d]in kHz) of more than 10 kHz,
   but not more than 250 percent of the authorized bandwidth: at least 29
   log (f[d]^2 /11) dB or 50 dB, whichever is the lesser attenuation.

   (iii) On any frequency removed from the center of the authorized
   bandwidth by more than 250 percent of the authorized bandwidth: at
   least 43 + 10 log (P) dB.

   (f) DSRCS-OBUs are governed under subpart L of this part.

   [ 53 FR 36789 , Sept. 22, 1988, as amended at  56 FR 15837 , Apr. 18, 1991.
   Redesignated and amended at  61 FR 28769 , 28770, June 6, 1996, and
   further redesignated and amended at  61 FR 46567 , 46568, Sept. 4, 1996;
    63 FR 36610 , July 7, 1998;  64 FR 69931 , Dec. 15, 1999;  65 FR 60878 ,
   Oct. 13, 2000;  67 FR 63289 , Oct. 11, 2002;  69 FR 46446 , Aug. 3, 2004;
    74 FR 22707 , May 14, 2009]