{"data":{"id":"us/47-cfr-90.281","jurisdiction":"us","citation":"47 CFR 90.281","heading":"Restrictions on operational fixed stations in the 421-430 MHz band.","body":"(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.\n(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.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES","PART 90—PRIVATE LAND MOBILE RADIO SERVICES","Subpart K—Standards for Special Frequencies or Frequency Bands"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-47.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:28Z","sha256":"ddd8a1c72fb18efb88899340f34c4d784a4db621c03d04db5f919ab6c5d5007a","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-90.279","next":"us/47-cfr-90.283"},"notice":"GroundRules: Original legal text. Not legal advice."}