CFR > Title 47 - Telecommunication > CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION > SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES (Parts 80–101) > 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 (§90.601 to §90.699) > 90.669—Emission limits.

90.669—Emission limits.

(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.

Code of Federal Regulations

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]