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Code of Federal Regulations Title 47. Telecommunication § 47.90.221 Adjacent channel power limits

Current as of January 02, 2025 | Updated by Findlaw Staff

(a) For the frequency bands indicated below, operations using equipment designed to operate with a 25 kHz channel bandwidth may be authorized up to a 22 kHz bandwidth if the equipment meets the adjacent channel power (ACP) limits below. The table specifies a value for the ACP as a function of the displacement from the channel center frequency and a measurement bandwidth of 18 kHz.

(b)(1) Maximum adjacent power levels for frequencies in the 450–470 MHz band:

Frequency offset

25 kHz

50 kHz

75 kHz

(2) In any case, no requirement in excess of −36 dBm shall apply.

(c)(1) Maximum adjacent power levels for frequencies in the 809–824/854–869 MHz band:

Frequency offset

Maximum ACP (dBc) for devices less than 15 watts

Maximum ACP (dBc) for devices 15 watts and above

25 kHz

−55 dBc

−55 dBc

50 kHz

−65 dBc

−65 dBc

75 kHz

−65 dBc

−70 dBc

(2) In any case, no requirement in excess of −36 dBm shall apply.

(d) On any frequency removed from the assigned frequency by more than 75 kHz, the attenuation of any emission must be at least 43 + 10 log (Pwatts) dB.

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Cite this article: FindLaw.com - Code of Federal Regulations Title 47. Telecommunication § 47.90.221 Adjacent channel power limits - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-47-telecommunication/cfr-sect-47-90-221/

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