47 CFR 15.225 - Operation within the band 13.110-14.010 MHz.
(a) The field strength of any emissions within the band 13. 553-13.567 MHz shall not exceed 15,848 microvolts/meter at 30 meters.
(d) The field strength of any emissions appearing outside of the 13. 110-14.010 MHz band shall not exceed the general radiated emission limits in § 15.209.
(e) The frequency tolerance of the carrier signal shall be maintained within ±0.01% of the operating frequency over a temperature variation of −20 degrees to 50 degrees C at normal supply voltage, and for a variation in the primary supply voltage from 85% to 115% of the rated supply voltage at a temperature of 20 degrees C. For battery operated equipment, the equipment tests shall be performed using a new battery.
(f) In the case of radio frequency powered tags designed to operate with a device authorized under this section, the tag may be approved with the device or be considered as a separate device subject to its own authorization. Powered tags approved with a device under a single application shall be labeled with the same identification number as the device.