154
MDS entraNET System Guide
MDS 05-4055A01, Rev. C
1. Determine the antenna system gain by subtracting the feedline loss
(in dB) from the antenna gain (in dBi). For example, if the antenna
gain is 10 dBi, and the feedline loss is 2 dB, the antenna system gain
is 8 dB.
2. Subtract the antenna system gain from 27 dBm (the maximum
allowable EIRP). The result indicates the maximum transmitter
power (in dBm) allowed under the rules. In the example above, this
is 19 dBm.
3. If the maximum transmitter power allowed is less than 27 dBm,
reduce the transmit power accordingly using the radio menu system
(
Main Menu>Radio Configuration>RF Output Power Setpoint
), or introduce
additional feedline loss. The EIRP of the antenna system should
never exceed 27 dBi.
For convenience,
Table 6-5
lists several antenna system gains and
shows the maximum allowable power setting. Note that a gain of 0 dB
entitles you to operate the radio at full power output 27 dBm (0.5 Watt).
To convert dBm to Watts, refer to
Table 8-4 on Page 189
.
* Most antenna manufacturers rate antenna gain in dBd in their litera-
ture. To convert to dBi, add 2.15 dB.
† Feedline loss varies by cable type and length. To determine the loss
for common lengths of feedline, see
Table 6-1 on Page 151
.
6.4
HOW MUCH OUTPUT POWER CAN
BE USED?
(ETSI 2400 MHz
systems)
In regions where ETSI requirements apply, 2400 MHz transceivers are
supplied from the factory with a +20 dBm (100 mW) RF power setting;
this is the maximum EIRP transmitter output power allowed under ETSI
standards. The power must be decreased from this level if the antenna
system gain exceeds 0 dBi. The allowable level is dependent on the
antenna gain, feedline loss, and the transmitter output power setting.
Table 6-5. Antenna System Gain versus Power Output Setting
(U.S.A. and Canada only)
Antenna System Gain
(Antenna Gain in dBi*
minus Feedline Loss in dB†)
Maximum Power
Setting
(in dBm)
EIRP
(in dBm)
0
27
27
5
22
27
7
20
27
9
18
27
12
15
27
15
12
27
Summary of Contents for entraNET 2400
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