47 CFR § 74.561 - Frequency tolerance.
---
identifier: "/us/cfr/t47/s74.561"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "47 CFR § 74.561 - Frequency tolerance."
title_number: 47
title_name: "Telecommunication"
section_number: "74.561"
section_name: "Frequency tolerance."
chapter_name: "FEDERAL COMMUNICATIONS COMMISSION"
subchapter_number: "C"
subchapter_name: "BROADCAST RADIO SERVICES"
part_number: "74"
part_name: "EXPERIMENTAL RADIO, AUXILIARY, SPECIAL BROADCAST AND OTHER PROGRAM DISTRIBUTIONAL SERVICES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "47 U.S.C. 154, 302a, 303, 307, 309, 310, 325, 336 and 554."
cfr_part: "74"
---
# 74.561 Frequency tolerance.
In the bands above 944 MHz, the operating frequency of the transmitter shall be maintained in accordance with the following table:
| Frequency band (MHz) | Tolerance as percentage of assigned frequency |
| --- | --- |
| 944 to 952 | 0.005 |
| 17,700 to 19,700 | 0.003 |
[54 FR 30043, July 18, 1989, as amended at 68 FR 12768, Mar. 17, 2003]