MDS 05-4055A01, Rev. C
MDS entraNET System Guide
153
gain of 6 dB or less entitles you to operate the radio at full power output
30 dBm (1 Watt).
* 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
.
To convert dBm to Watts, refer to the chart shown on Page 189.
6.3
HOW MUCH OUTPUT POWER CAN
BE USED?
(U.S.A. and Canada, 2400 MHz systems)
Non-ETSI 2400 MHz transceivers are normally supplied from the fac-
tory set for +27 dBm (0.5 Watt) RF power output; this is the maximum
transmitter output power allowed under FCC and Industry Canada rules.
The power must be decreased from this level if the antenna system gain
exceeds 0 dBi. The allowable level depends on the antenna gain, feed-
line loss, and the transmitter output power setting.
NOTE:
In regions where ETSI requirements apply, the maximum
allowable RF output is generally limited to 100 mW (+20
dBm) on 2400 MHz. License-free operation on 900 MHz is not
permitted. For more information, see
HOW MUCH OUTPUT
POWER CAN BE USED? (ETSI 2400 MHz systems)
on
Page 154.
6.3.1 Calculating System Gain
To determine the maximum allowable power setting of the radio, per-
form the following steps:
Table 6-4. 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)
6 (or less)
30
36
8
28
36
10
26
36
12
24
36
14
22
36
16
20
36
Summary of Contents for entraNET 2400
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