{"data":{"id":"us/47-cfr-90.635","jurisdiction":"us","citation":"47 CFR 90.635","heading":"Limitations on power and antenna height.","body":"(a) The effective radiated power and antenna height for base stations may not exceed 1 kilowatt (30 dBw) and 304 m. (1,000 ft.) above average terrain (AAT), respectively, or the equivalent thereof as determined from the Table. These are maximum values, and applicants will be required to justify power levels and antenna heights requested.\n(b) The maximum output power of the transmitter for mobile stations is 100 watts (20 dBw).\nTable—Equivalent Power and Antenna Heights for Base Stations in the 851-869 MHz and 935-940 MHz Bands Which Have a Requirement for a 32 km (20 mi) Service Area Radius\nAntenna height (ATT) meters (feet) Effective radiated power (watts) 1 2 4\nAbove 1,372 (4,500) 65\nAbove 1,220 (4,000) to 1,372 (4,500) 70\nAbove 1,067 (3,500) to 1,220 (4,000) 75\nAbove 915 (3,000) to 1,067 (3,500) 100\nAbove 763 (2,500) to 915 (3,000) 140\nAbove 610 (2,000) to 763 (2,500) 200\nAbove 458 (1,500) to 610 (2,000) 350\nAbove 305 (1,000) to 458 (1,500) 600\nUp to 305 (1,000) 3 1,000\n1 Power is given in terms of effective radiated power (ERP).\n2 Applicants in the Los Angeles, CA, area who demonstrate a need to serve both the downtown and fringe areas will be permitted to utilize an ERP of 1 kw at the following mountaintop sites: Santiago Park, Sierra Peak, Mount Lukens, and Mount Wilson.\n3 Stations with antennas below 305 m (1,000 ft) (AAT) will be restricted to a maximum power of 1 kw (ERP).\n4 Licensees in San Diego, CA, will be permitted to utilize an ERP of 500 watts at the following mountaintop sites: Palomar, Otay, Woodson and Miguel.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES","PART 90—PRIVATE LAND MOBILE RADIO SERVICES","Subpart S—Regulations Governing Licensing and Use of Frequencies in the 806-824, 851-869, 896-901, and 935-940 MHz 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":"c26f5b15320034883e7a5233eeb9596cda559120523453300bb5cd4fd48057e4","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-90.633","next":"us/47-cfr-90.637"},"notice":"GroundRules: Original legal text. Not legal advice."}