Goto Section: 90.1213 | 90.1217 | Table of Contents
FCC 90.1215
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 90.1215 Power limits.
The transmitting power of stations operating in the 4940-4990 MHz band must
not exceed the maximum limits in this section.
(a)(1) The maximum conducted output power should not exceed:
Channel bandwidth (MHz) Low power
maximum conducted
output power (dBm) High power maximum
conducted output
power (dBm)
1 7 20
5 14 27
10 17 30
15 18.8 31.8
20 20 33
(2) High power devices are also limited to a peak power spectral density of
21 dBm per one MHz. High power devices using channel bandwidths other than
those listed above are permitted; however, they are limited to peak power
spectral density of 21 dBm/MHz. If transmitting antennas of directional gain
greater than 9 dBi are used, both the maximum conducted output power and the
peak power spectral density should be reduced by the amount in decibels that
the directional gain of the antenna exceeds 9 dBi. However, high power
point-to-point and point-to-multipoint operations (both fixed and
temporary-fixed rapid deployment) may employ transmitting antennas with
directional gain up to 26 dBi without any corresponding reduction in the
maximum conducted output power or spectral density. Corresponding reduction
in the maximum conducted output power and peak power spectral density should
be the amount in decibels that the directional gain of the antenna exceeds
26 dBi.
(b) Low power devices are also limited to a peak power spectral density of 8
dBm per one MHz. Low power devices using channel bandwidths other than those
listed above are permitted; however, they are limited to a peak power
spectral density of 8 dBm/MHz. If transmitting antennas of directional gain
greater than 9 dBi are used, both the maximum conducted output power and the
peak power spectral density should be reduced by the amount in decibels that
the directional gain of the antenna exceeds 9 dBi.
(c) The maximum conducted output power is measured as a conducted emission
over any interval of continuous transmission using instrumentation
calibrated in terms of an RMS-equivalent voltage. If the device cannot be
connected directly, alternative techniques acceptable to the Commission may
be used. The measurement results shall be properly adjusted for any
instrument limitations, such as detector response times, limited resolution
bandwidth capability when compared to the emission bandwidth, sensitivity,
etc., so as to obtain a true maximum conducted output power measurement
conforming to the definitions in this paragraph for the emission in
question.
(d) The peak power spectral density is measured as conducted emission by
direct connection of a calibrated test instrument to the equipment under
test. If the device cannot be connected directly, alternative techniques
acceptable to the Commission may be used. Measurements are made over a
bandwidth of one MHz or the 26 dB emission bandwidth of the device,
whichever is less. A resolution bandwidth less than the measurement
bandwidth can be used, provided that the measured power is integrated to
show total power over the measurement bandwidth. If the resolution bandwidth
is approximately equal to the measurement bandwidth, and much less than the
emission bandwidth of the equipment under test, the measured results shall
be corrected to account for any difference between the resolution bandwidth
of the test instrument and its actual noise bandwidth.
(e) The ratio of the peak excursion of the modulation envelope (measured
using a peak hold function) to the maximum conducted output power shall not
exceed 13 dB across any 1 MHz bandwidth or the emission bandwidth whichever
is less.
[70 CFR 28467, May 18, 2005, as amended at 74 FR 23803 , May 21, 2009; 74 FR 27455 , June 10, 2009]
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Goto Section: 90.1213 | 90.1217
Goto Year: 2014 |
2016
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