Goto Section: 15.250 | 15.252 | Table of Contents
FCC 15.251
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 15.251 Operation within the bands 2.9-3.26 GHz, 3.267-3.332 GHz,
3.339-3.3458 GHz, and 3.358-3.6 GHz.
(a) Operation under the provisions of this section is limited to automatic
vehicle identification systems (AVIS) which use swept frequency techniques
for the purpose of automatically identifying transportation vehicles.
(b) The field strength anywhere within the frequency range swept by the
signal shall not exceed 3000 microvolts/meter/MHz at 3 meters in any
direction. Further, an AVIS, when in its operating position, shall not
produce a field strength greater than 400 microvolts/meter/MHz at 3 meters
in any direction within ±10 degrees of the horizontal plane. In addition to
the provisions of § 15.205, the field strength of radiated emissions outside
the frequency range swept by the signal shall be limited to a maximum of 100
microvolts/meter/MHz at 3 meters, measured from 30 MHz to 20 GHz for the
complete system. The emission limits in this paragraph are based on
measurement instrumentation employing an average detector. The provisions in
§ 15.35 for limiting peak emissions apply.
(c) The minimum sweep repetition rate of the signal shall not be lower than
4000 sweeps per second, and the maximum sweep repetition rate of the signal
shall not exceed 50,000 sweeps per second.
(d) An AVIS shall employ a horn antenna or other comparable directional
antenna for signal emission.
(e) Provision shall be made so that signal emission from the AVIS shall
occur only when the vehicle to be identified is within the radiated field of
the system.
(f) In addition to the labelling requirements in § 15.19(a), the label
attached to the AVIS transmitter shall contain a third statement regarding
operational conditions, as follows:
* * * and, (3) during use this device (the antenna) may not be pointed
within ±** degrees of the horizontal plane.
The double asterisks in condition three (**) shall be replaced by the
responsible party with the angular pointing restriction necessary to meet
the horizontal emission limit specified in paragraph (b).
(g) In addition to the information required in subpart J of part 2, the
application for certification shall contain:
(1) Measurements of field strength per MHz along with the intermediate
frequency of the spectrum analyzer or equivalent measuring receiver;
(2) The angular separation between the direction at which maximum field
strength occurs and the direction at which the field strength is reduced to
400 microvolts/meter/MHz at 3 meters;
(3) A photograph of the spectrum analyzer display showing the entire swept
frequency signal and a calibrated scale for the vertical and horizontal
axes; the spectrum analyzer settings that were used shall be labelled on the
photograph; and,
(4) The results of the frequency search for spurious and sideband emissions
from 30 MHz to 20 GHz, exclusive of the swept frequency band, with the
measuring instrument as close as possible to the unit under test.
[ 54 FR 17714 , Apr. 25, 1989; 54 FR 32340 , Aug. 7, 1989]
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Goto Section: 15.250 | 15.252
Goto Year: 2014 |
2016
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