47 C.F.R. § 90.669 Emission limits.
Title 47 - Telecommunication
(a) On any frequency in an MTA licensee's spectrum block that is adjacent to a non-MTA frequency, the power of any emission shall be attenuated below the transmitter power (P) by at least 43 plus 10 log10(P) decibels or 80 decibels, whichever is the lesser attenuation. Note: The measurements of emission power can be expressed in peak or average values, provided they are expressed in the same parameters as the transmitter power. (b) When an emission outside of the authorized bandwidth causes harmful interference, the Commission may, at its discretion, require greater attenuation than specified in this section. [60 FR 21992, May 4, 1995]
Title 47: Telecommunication
PART 90—PRIVATE LAND MOBILE RADIO SERVICES
Subpart S—Regulations Governing Licensing and Use of Frequencies in the 806–824, 851–869, 896–901, and 935–940 MHz Bands
Policies Governing the Licensing and Use of MTA-Based SMR Systems in the 896–901/935–940 MHz Band
§ 90.669 Emission limits.
