---
kind: "section"
citation: "47 C.F.R. § 87.71"
title: "47"
number: "87.71"
heading: "Frequency measurements."
url: "https://uscodex.org/cfr/47/87.71"
---

# §87.71. Frequency measurements.


A licensed operator must measure the operating frequencies of all land-based transmitters at the following times:

- (a) When the transmitter is originally installed;
- (b) When any change or adjustment is made in the transmitter which may affect an operating frequency; or
- (c) **When an operating frequency has shifted beyond tolerance.**

## Notes

### Authority

Authority: 47 U.S.C. 154, 303 and 307(e), unless otherwise noted.

### Source

Source: 53 FR 28940, Aug. 1, 1988, unless otherwise noted.