47 C.F.R. § 30.402
Frequency tolerance
The carrier frequency of each transmitter authorized under this subpart must be maintained within the following percentage of the reference frequency (unless otherwise specified in the instrument of station authorization the reference frequency will be deemed to be the assigned frequency):
| Frequency (MHz) | Frequency tolerance (percent) |
|---|---|
| 27,500 to 28,350 | 0.001 |
| 38,600 to 40,000 | 0.03 |