47 CFR 24.135 - Frequency stability.
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(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.
(b) For battery operated equipment, the equipment tests shall be performed using a new battery without any further requirement to vary supply voltage.
Title 47 published on 2014-10-01
no entries appear in the Federal Register after this date.