Goto Section: 90.1213 | 90.1217 | Table of Contents
FCC 90.1215
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 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]
Goto Section: 90.1213 | 90.1217
Goto Year: 2010 |
2012
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