Goto Section: 90.1319 | 90.1323 | Table of Contents
Revised as of October 22, 2020
Goto Year:2020 |
§ 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: 2020 |
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