---
kind: "section"
citation: "47 C.F.R. § 90.261"
title: "47"
number: "90.261"
heading: "Assignment and use of the frequencies in the band 450-470 MHz for fixed operations."
url: "https://uscodex.org/cfr/47/90.261"
---

# §90.261. Assignment and use of the frequencies in the band 450-470 MHz for fixed operations.

- (a) Frequencies in the 450-470 MHz band as listed in §§ [90.20(c)(3)](/cfr/47/90.20.md?p=c-3) and [90.35(b)(3)](/cfr/47/90.35.md?p=b-3) may be assigned to all eligibles for fixed use on a secondary basis to land mobile operations.
- (b) Fixed stations located 140 km (87 mi) or more from the center of any urbanized area of 600,000 or more population are limited to a transmitter output power of 75 watts. Fixed stations less than 140 km (87 mi) from the centers of these areas are limited to a transmitter output power of 20 watts. Urbanized areas of 600,000 or more population are defined in the U.S. Census of Population 1970, Vol. 1, Table 20, pages 1-74. The centers of the urbanized areas are determined from the Appendix, page 226, of the U.S. Department of Commerce publication “Airline Distance Between Cities in the United States.”
- (c) All fixed systems are limited to one frequency pair with 5 MHz spacing and must employ directional antennas with a front-to-back ratio of 15dB, except that omnidirectional antennas having unity gain may be employed by stations communicating with a minimum of three receiving locations encompassed in a sector of at least 160° in azimuth. Stations authorized for secondary fixed operations prior to July 13, 1992, may continue to operate under the conditions of their initial authorization.
- (d) -(e) [Reserved]
- (f) Secondary fixed operations pursuant to [paragraph (a)](#a) of this section will not be authorized on the following frequencies or on frequencies subject to [§ 90.267](/cfr/47/90.267.md), except as provided in [§ 90.219(d)(3)(ii)](/cfr/47/90.219.md?p=d-3-ii):

## Notes

### Amendments

[57 FR 24992, June 12, 1992, as amended at 58 FR 33212, June 16, 1993; 60 FR 37268, July 19, 1995; 62 FR 18928, Apr. 17, 1997; 68 FR 19461, Apr. 21, 2003; 72 FR 35196, June 27, 2007; 83 FR 61097, Nov. 27, 2018]

### 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

[57 FR 24992, June 12, 1992, as amended at 58 FR 33212, June 16, 1993; 60 FR 37268, July 19, 1995; 62 FR 18928, Apr. 17, 1997; 68 FR 19461, Apr. 21, 2003; 72 FR 35196, June 27, 2007; 83 FR 61097, Nov. 27, 2018]