Sec. 22.917  Emission limitations for cellular.

    The rules in this section govern the spectral characteristics of 
emissions in the Cellular Radiotelephone Service.
    (a) Analog radiotelephony emissions. F3E emissions must be used only 
on the communication channels.
    (b) F3E/F3D emission mask for use with audio filter. For F3E and F3D 
emissions, except as provided in paragraph (c) of this section, the mean 
power of emissions must be attenuated below the mean power of the 
unmodulated carrier wave (P) as follows:
    (1) On any frequency removed from the carrier frequency by more than 
20 kHz but not more than 45 kHz:

at least 26 dB;

    (2) On any frequency removed from the carrier frequency by more than 
45 kHz, up to the first multiple of the carrier frequency:

at least 60 dB or 43 + 10 log P dB, whichever is the lesser attenuation.

    (c) Alternative F3E/F3D emission mask. For F3E and F3D emissions, 
transmitters may comply with the emission limitations in this paragraph 
in lieu of compliance with paragraph (b) of this section and the audio 
filter requirement of Sec. 22.915.
    (1) The mean power of any emission removed from the carrier 
frequency by a displacement frequency (fd in kHz) must be 
attenuated below the mean power of the unmodulated carrier (P) as 
follows:
    (i) On any frequency removed from the carrier frequency by more than 
12 kHz but not more than 20 kHz:

at least 117 log (fd12) dB;

    (ii) On any frequency removed from the carrier frequency by more 
than 20 kHz, up to the first multiple of the carrier frequency:

at least 100 log (fd11) dB or 60 dB or 43 + 10 log P 
dB, whichever is the lesser attenuation;

    (2) For mobile stations, modulating signals other than the 
supervisory audio tone in the frequency range of 5.9 to 6.1 kHz must be 
attenuated, relative to the level at 1 kHz, at least 35 dB.
    (d) F1D emission mask. For F1D emissions, the mean power of 
emissions must be attenuated below the mean power of the unmodulated 
carrier (P) as follows:
    (1) On any frequency removed from the carrier frequency by more than 
20 kHz but not more than 45 kHz:

at least 26 dB;

    (2) On any frequency removed from the carrier frequency by more than 
45 kHz but not more than 90 kHz:

at least 45 dB;

    (3) On any frequency removed from the carrier frequency by more than 
90 kHz, up to the first multiple of the carrier frequency:

at least 60 dB or 43+10 log P dB, whichever is the lesser attenuation.

    (e) Out of band emissions. The mean power of emissions must be 
attenuated below the mean power of the unmodulated carrier (P) on any 
frequency twice or more than twice the fundamental frequency by:

at least 43+10 log P dB.

    (f) Mobile emissions in base frequency range. The mean power of any 
emissions appearing in the base station frequency range from cellular 
mobile transmitters operated must be attenuated to a level not to exceed 
-80 dBm at the transmit antenna connector.
    (g) Interference from spurious emissions. If any emission from a 
transmitter operating in this service results in interference to users 
of another radio service, the FCC may require a greater attenuation of 
that emission than specified in this section.
    (h) Measurement procedure. The following spectrum analyzer bandwidth 
settings should be used for measurement of spurious emissions:
    (1) When operating in the radiotelephony mode or the supervisory 
audio tone mode:
    (i) For any emission not more than 45 kHz removed from the carrier 
frequency: 300 Hz;

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    (ii) For any emission more than 45 kHz removed from the carrier 
frequency: 30 kHz.
    (2) When operating in the wideband data mode or the signaling tone 
mode:
    (i) For any emission not more than 60 kHz removed from the carrier 
frequency: 300 Hz;
    (ii) For any emission more than 60 kHz removed from the carrier 
frequency: 30 kHz.