---
kind: "section"
citation: "47 C.F.R. § 90.221"
title: "47"
number: "90.221"
heading: "Adjacent channel power limits."
url: "https://uscodex.org/cfr/47/90.221"
---

# §90.221. Adjacent channel power limits.

- (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—**
  - (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—**
  - (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.

## Notes

### Amendments

[77 FR 61538, Oct. 10, 2012]

### Authority

Authority: 47 U.S.C. 154(i), 161, 303(g), 303(r), 332(c)(7), 1401-1473

### Source

Source: 43 FR 54791, Nov. 22, 1978, unless otherwise noted.

### Amendments

[77 FR 61538, Oct. 10, 2012]