{"data":{"id":"us/47-cfr-24.135","jurisdiction":"us","citation":"47 CFR 24.135","heading":"Frequency stability.","body":"(a) The frequency stability of the transmitter shall be maintained within ±0.0001 percent (±1 ppm) of the center frequency over a temperature variation of −30 °Celsius to + 50 °Celsius at normal supply voltage, and over a variation in the primary supply voltage of 85 percent to 115 percent of the rated supply voltage at a temperature of 20 °Celsius.\n(b) For battery operated equipment, the equipment tests shall be performed using a new battery without any further requirement to vary supply voltage.\n(c) It is acceptable for a transmitter to meet this frequency stability requirement over a narrower temperature range provided the transmitter ceases to function before it exceeds these frequency stability limits.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER B—COMMON CARRIER SERVICES","PART 24—PERSONAL COMMUNICATIONS SERVICES","Subpart D—Narrowband PCS"],"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":"9b11913e1deadbc69031412e349489a5c6e9bed23bd421740509136b17a17c8d","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-24.134","next":"us/47-cfr-24.200"},"notice":"GroundRules: Original legal text. Not legal advice."}