47 CFR 78.111 - Frequency tolerance.

Regulations last checked for updates: Feb 06, 2026

Title 47 - Telecommunication last revised: Jan 30, 2026

View all text of Subpart D [§ 78.101 - § 78.115]

§ 78.111 - Frequency tolerance.

Stations in this service shall maintain the carrier frequency of each authorized transmitter to within the following percentage of the assigned frequency.

Frequency band (MHz)	Frequency tolerance
Frequency band (MHz)	Fixed (percent)	Mobile (percent)
1,990 to 2,110		0.005
6,425 to 6,525		0.005
6,875 to 7,125		0.005
12,700 to 13,250 ¹	0.005	0.005
17,700 to 18,820	0.003
18,820 to 18,920	0.001
18,920 to 19,700	0.003

¹ Stations that employing vestigal sideband AM transmissions shall maintain their operating frequency within 0.0005% the visual carrier, and the aural carrier shall be 4.5 MHz ±1 kHz above the visual carrier frequency.

[52 FR 7145, Mar. 9, 1987, as amended at 68 FR 12776, Mar. 17, 2003]

authority: 47 U.S.C. 152,153,154,301,303,307,308,309

source: 37 FR 3292, Feb. 12, 1972, unless otherwise noted.

cite as: 47 CFR 78.111