---
kind: "section"
citation: "47 C.F.R. § 15.517"
title: "47"
number: "15.517"
heading: "Technical requirements for indoor UWB systems."
url: "https://uscodex.org/cfr/47/15.517"
---

# §15.517. Technical requirements for indoor UWB systems.

- (a) Operation under the provisions of this section is limited to UWB transmitters employed solely for indoor operation.
  - (1) Indoor UWB devices, by the nature of their design, must be capable of operation only indoors. The necessity to operate with a fixed indoor infrastructure, e.g., a transmitter that must be connected to the AC power lines, may be considered sufficient to demonstrate this.
  - (2) The emissions from equipment operated under this section shall not be intentionally directed outside of the building in which the equipment is located, such as through a window or a doorway, to perform an outside function, such as the detection of persons about to enter a building.
  - (3) The use of outdoor mounted antennas, e.g., antennas mounted on the outside of a building or on a telephone pole, or any other outdoors infrastructure is prohibited.
  - (4) Field disturbance sensors installed inside of metal or underground storage tanks are considered to operate indoors provided the emissions are directed towards the ground.
  - (5) A communications system shall transmit only when the intentional radiator is sending information to an associated receiver.
- (b) The UWB bandwidth of a UWB system operating under the provisions of this section must be contained between 3100 MHz and 10,600 MHz.
- (c) The radiated emissions at or below 960 MHz from a device operating under the provisions of this section shall not exceed the emission levels in [§ 15.209](/cfr/47/15.209.md). The radiated emissions above 960 MHz from a device operating under the provisions of this section shall not exceed the following average limits when measured using a resolution bandwidth of 1 MHz:
- (d) In addition to the radiated emission limits specified in the table in [paragraph (c)](#c) of this section, UWB transmitters operating under the provisions of this section shall not exceed the following average limits when measured using a resolution bandwidth of no less than 1 kHz:
- (e) There is a limit on the peak level of the emissions contained within a 50 MHz bandwidth centered on the frequency at which the highest radiated emission occurs, fM. That limit is 0 dBm EIRP. It is acceptable to employ a different resolution bandwidth, and a correspondingly different peak emission limit, following the procedures described in [§ 15.521](/cfr/47/15.521.md).
- (f) UWB systems operating under the provisions of this section shall bear the following or similar statement in a conspicuous location on the device or in the instruction manual supplied with the device:

## Notes

### Amendments

[67 FR 34856, May 16, 2002; 67 FR 39632, June 10, 2002]

### Source

Source: 67 FR 34856, May 16, 2002, unless otherwise noted.

### 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

[67 FR 34856, May 16, 2002; 67 FR 39632, June 10, 2002]