---
kind: "section"
citation: "47 C.F.R. § 15.229"
title: "47"
number: "15.229"
heading: "Operation within the band 40.66-40.70 MHz."
url: "https://uscodex.org/cfr/47/15.229"
---

# §15.229. Operation within the band 40.66-40.70 MHz.

- (a) Unless operating pursuant to the provisions in [§ 15.231](/cfr/47/15.231.md), the field strength of any emissions within this band shall not exceed 1,000 microvolts/meter at 3 meters.
- (b) As an alternative to the limit in [paragraph (a)](#a) of this section, perimeter protection systems may demonstrate compliance with the following: the field strength of any emissions within this band shall not exceed 500 microvolts/meter at 3 meters, as determined using measurement instrumentations employing an average detector. The provisions in [§ 15.35](/cfr/47/15.35.md) for limiting peak emissions apply where compliance of these devices is demonstrated under this alternative emission limit.
- (c) The field strength of any emissions appearing outside of this band shall not exceed the general radiated emission limits in [§ 15.209](/cfr/47/15.209.md).
- (d) 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.

## Notes

### Amendments

[54 FR 17714, Apr. 25, 1989, as amended at 55 FR 33910, Aug. 20, 1990]

### Authority

Authority: 47 U.S.C. 154, 302a, 303, 304, 307, 336, 544a, and 549.

### Source

Source: 54 FR 17714, Apr. 25, 1989, unless otherwise noted.

### Amendments

[54 FR 17714, Apr. 25, 1989, as amended at 55 FR 33910, Aug. 20, 1990]