Table of Contents
Advertisement
implemented, the maximum conducted output power is the highest total transmit power occurring in
any mode.
(5) Fixed point-to-point systems in the bands 2400-2483.5 MHz and 5725-5850 MHz are permitted to
have an e.i.r.p. higher than 4 W provided that the higher e.i.r.p. is achieved by employing higher gain
directional antennas and not higher transmitter output powers. Point-to-multipoint systems,2
omnidirectional applications and multiple co-located transmitters transmitting the same information are
prohibited from exceeding an e.i.r.p. of 4 W.
(6) Transmitters may operate in the band 2400-2483.5 MHz, employing antenna systems that emit
multiple directional beams simultaneously or sequentially, for the purpose of directing signals to
individual receivers or to groups of receivers, provided that the emissions comply with the following:
(i) Different information must be transmitted to each receiver.
(ii) 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 applicable output
power limit specified in sections 5.4(2) and 5.4(4). However, the total conducted output power shall be
reduced by 1 dB below the specified limits for each 3 dB that the directional gain of the
antenna/antenna array exceeds 6 dBi. The directional antenna gain shall be computed as the sum of
10 log (number of array elements or staves) plus the directional gain of the element or stave having the
highest gain.
(iii) If a transmitter employs an antenna that operates simultaneously on multiple directional beams
using the same or different frequency channels, the power supplied to each emission beam is subject
to the applicable power limit specified in sections 5.4(2) and 5.4(4). If transmitted beams overlap, the
power shall be reduced to ensure that their aggregate power does not exceed the applicable limit
specified in sections 5.4(2) and 5.4(4). In addition, the aggregate power transmitted simultaneously on
all beams shall not exceed the applicable limit specified in sections 5.4(2) and 5.4(4) by more than 8
dB.
(iv) Transmitters that transmit a single directional beam shall operate under the provisions of sections
5.4(2), 5.4(4) and 5.4(5).
5.5 Unwanted Emissions
In any 100 kHz bandwidth outside the frequency band in which the spread spectrum or digitally
modulated device is operating, the RF power that is produced shall be at least 20 dB below that in the
100 kHz bandwidth within the band that contains the highest level of the desired power, based on
either an RF conducted or a radiated measurement, provided that the transmitter demonstrates
compliance with the peak conducted power limits. If the transmitter complies with the conducted power
limits based on the use of root-mean-square averaging over a time interval, as permitted under Section
5.4(4), the attenuation required shall be 30 dB instead of 20 dB. Attenuation below the general field
strength limits specified in RSS-Gen is not required.
No part of this publication may be reproduced in any form or by any means or used to make any
derivative work (such as translation, transformation or adaptation) without written permission from UTC
VI
Advertisement
Table of Contents
