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158 GE MDS entraNET Reference Manual 05-4055A01, Rev. D

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 193.

* 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 155.

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)

02727

52227

72027

91827

12 15 27

15 12 27

1 2 ... 163 164 165 166 167 168 169 170 171 172 173 ... 219 220

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