---
kind: "section"
citation: "47 C.F.R. § 90.269"
title: "47"
number: "90.269"
heading: "Use of frequencies for self-powered vehicle detectors."
url: "https://uscodex.org/cfr/47/90.269"
---

# §90.269. Use of frequencies for self-powered vehicle detectors.

- (a) Frequencies subject to [§ 90.20(d)(22)](/cfr/47/90.20.md?p=d-22) may be used for the operation of self-powered vehicle detectors by licensees of base/mobile stations in the Public Safety Pool in accordance with the following conditions:
  - (1) All stations are limited to 100 milliwatts carrier power and 20K00F7W, 20K00F7X, 20K00F8W, 20K00F8X, 20K00F9W or 20K00F9X emissions. The frequency deviation shall not exceed 5 kHz. No more than two 30 ms. pulses may be emitted for each vehicle sensed.
  - (2) The transmitters must be crystal controlled with a frequency tolerance of plus or minus .005% from −20° to plus 50 °C. They must be certificated.
  - (3) The total length of the transmission line plus antenna may not exceed one-half wavelength and must be integral with the unit.
  - (4) All operation shall be on a secondary, non-interference basis.
- (b) [Reserved]

## Notes

### Amendments

[48 FR 54982, Dec. 8, 1983, as amended at 54 FR 38681, Sept. 20, 1989; 62 FR 18929, Apr. 17, 1997; 63 FR 36610, July 7, 1998]

### Authority

Authority: 47 U.S.C. 154(i), 161, 303(g), 303(r), 332(c)(7), 1401-1473

### Source

Source: 43 FR 54791, Nov. 22, 1978, unless otherwise noted.

### Amendments

[48 FR 54982, Dec. 8, 1983, as amended at 54 FR 38681, Sept. 20, 1989; 62 FR 18929, Apr. 17, 1997; 63 FR 36610, July 7, 1998]