Goto Section: 90.1319 | 90.1323 | Table of Contents
FCC 90.1321
Revised as of October 1, 2008
Goto Year:2007 |
2009
Sec. 90.1321 Power and antenna limits.
(a) Base and fixed stations are limited to 25 watts/25 MHz equivalent
isotropically radiated power (EIRP). In any event, the peak EIRP power
density shall not exceed 1 Watt in any one-megahertz slice of spectrum.
(b) In addition to the provisions in paragraph (a) of this section,
transmitters operating in the 3650–3700 MHz band that emit multiple
directional beams, simultaneously or sequentially, for the purpose of
directing signals to individual receivers or to groups of receivers provided
the emissions comply with the following:
(1) Different information must be transmitted to each receiver.
(2) If the transmitter employs an antenna system that emits multiple
directional beams but does not emit multiple directional beams
simultaneously, the total output power conducted to the array or arrays that
comprise the device, i.e. , the sum of the power supplied to all antennas,
antenna elements, staves, etc. and summed across all carriers or frequency
channels, shall not exceed the limit specified in paragraph (a) of this
section, as applicable. The directional antenna gain shall be computed as
follows:
(i) The directional gain, in dBi, shall be calculated as the sum of 10 log
(number of array elements or staves) plus the directional gain, in dBi, of
the individual element or stave having the highest gain.
(ii) A lower value for the directional gain than that calculated in
paragraph (b)(2)(i) of this section will be accepted if sufficient evidence
is presented, e.g. , due to shading of the array or coherence loss in the
beam-forming.
(3) If a transmitter employs an antenna that operates simultaneously on
multiple directional beams using the same or different frequency channels
and if transmitted beams overlap, the power shall be reduced to ensure that
the aggregate power from the overlapping beams does not exceed the limit
specified in paragraph (b)(2) of this section. In addition, the aggregate
power transmitted simultaneously on all beams shall not exceed the limit
specified in paragraph (b)(2) of this section by more than 8 dB.
(4) Transmitters that emit a single directional beam shall operate under the
provisions of paragraph (b)(2) of this section.
(c) Mobile and portable stations are limited to 1 watt/25 MHz EIRP. In any
event, the peak EIRP density shall not exceed 40 milliwatts in any
one-megahertz slice of spectrum.
Goto Section: 90.1319 | 90.1323
Goto Year: 2007 |
2009
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