Sec. 22.861  Emission limitations.

    Any appropriate emission type may be used to provide air-ground 
radiotelephone service on the channels listed in Sec. 22.857, provided 
that the emission limitations of this section are met.
    (a) Emission mask. The emission mask described in this paragraph 
applies instead of those in Sec. 22.359. The power of any emission in 
each of the adjacent channels must be at least 30 dB below the power of 
the total emission. The power of any emission in any of the channels 
other than the one being used and the adjacent channels must be at least 
50 dB below the power of the total emission.
    (b) Airborne mobile transmitters. The power of any emission in each 
of the adjacent channels must not exceed -130 dBm at any ground station 
receiver, assuming a 0 dBi receive antenna. The power of any emission in 
any of the channels other than the one being used and the adjacent 
channels must not exceed -148 dBm at any ground station receiver, 
assuming a 0 dBi receive antenna.
    (c) Ground station transmitters. The effective radiated power (ERP) 
of any emission outside of the frequency ranges set forth in Sec. 22.857 
must not exceed -10 dBm. The ERP of any emission in each of the adjacent 
channels must not exceed +10 dBm. The ERP of any emission in any of the 
channels other than the one being used and the adjacent channels must 
not exceed -5 dBm.
    (d) If an emission on any frequency outside of the authorized 
bandwidth

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causes harmful interference, the FCC may require greater attenuation of 
that emission than required in paragraph (a) of this section.