---
kind: "section"
citation: "47 C.F.R. § 90.281"
title: "47"
number: "90.281"
heading: "Restrictions on operational fixed stations in the 421-430 MHz band."
url: "https://uscodex.org/cfr/47/90.281"
---

# §90.281. Restrictions on operational fixed stations in the 421-430 MHz band.

- (a) Except for control stations, operational fixed facilities will not be authorized in the 421-430 MHz band. This does not preclude secondary fixed tone signaling and alarm operations authorized in [§ 90.235](/cfr/47/90.235.md).
- (b) Control stations associated with one or more mobile relay stations will be authorized only on the assigned frequency of the associated mobile station. Use of a mobile service frequency by a control station of a mobile relay system is subject to the condition that harmful interference shall not be caused to stations of licensees authorized to use the frequency for mobile service communications.

## Notes

### Amendments

[52 FR 6158, Mar. 2, 1987, as amended at 54 FR 38681, Sept. 20, 1989]

### 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

[52 FR 6158, Mar. 2, 1987, as amended at 54 FR 38681, Sept. 20, 1989]