---
kind: "section"
citation: "47 C.F.R. § 25.289"
title: "47"
number: "25.289"
heading: "Protection of GSO networks by NGSO systems."
url: "https://uscodex.org/cfr/47/25.289"
---

# §25.289. Protection of GSO networks by NGSO systems.

- (a) **Unacceptable interference.** Unless otherwise provided in this chapter, an NGSO system licensee must not cause unacceptable interference to, or claim protection from, a GSO FSS or GSO BSS network.
  - (1) An NGSO FSS licensee operating in compliance with the applicable equivalent power flux-density limits in Article 22, Section II of the ITU Radio Regulations (incorporated by reference, [§ 25.108](/cfr/47/25.108.md)) will be considered as having fulfilled this obligation with respect to any GSO network.
  - (2) [Reserved]
- (b) **Coordination.** GSO and NGSO satellite operators must coordinate in good faith the use of commonly authorized frequencies in the 10.7-12.7, 17.3-18.6, or 19.7-20.2 GHz bands in the United States.

## Notes

### Amendments

[91 FR 26948, May 13, 2026]

### Source

Source: 58 FR 13421, Mar. 11, 1993, unless otherwise noted.

### Authority

Authority: 47 U.S.C. 154, 301, 302, 303, 307, 309, 310, 319, 332, 605, and 721, unless otherwise noted.

### Amendments

[91 FR 26948, May 13, 2026]