Microhard Systems pMXDDL2450, Руководство по эксплуатации

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pMXDDL2450 Operating Manual
9
Examples:
FCC and Industry Canada
Regulations allow up to 36dBm
effective isotropically radiated
power ( EIRP ). Therefore, the
sum of the transmitted power (in
dBm), the cabling loss and the
antenna gain cannot exceed
36dBm with respect to the
isotropic radiator.
Example 1)
What is the maximum power the
pMXDDL2450 can be set to
comply with FCC and IC given
the following equipment given a
Rubber Ducky Ant Gain 2dBi and
no cable or connectors in the
system?
Max EIRP 36dBm
Max TX power = EIRP – Ant
Gain(dBi) + Cable/Connector loss
(dB)
Ant Gain dBi = 2dBi
Max TX power = 36dBm – 2dBi +
0dB = 34dBm
We can set the modem to the
maximum power setting of 30dBm.
Example 2)
What is the maximum power the
pMXDDL2450 can be set to
comply with FCC and IC given
the following equipment given a
Yagi Ant Gain 12dBd and cable
and connector loss of 4.5 dB?
Max EIRP 36dBm
Max TX power = EIRP – Ant
Gain(dBi) + Cable/Connector loss
(dB)
Ant Gain dBi = Ant Gain dBd + 2.15
dB
Yagi Gain (dBi) = 12 + 2.15 =
14.15dBi
Max TX power = 36dBm –
14.15dB + 4.5dB = 26.35dBm
We must round down
Hence Max TX power = 26dBm
Example 3)
What is the maximum power the pMXDDL2450 can be set to comply
with FCC and IC given the following equipment given a Omni Ant Gain
6dBd and cable and connector loss of 2.5 dB?
Max EIRP 36dBm
Max TX power = EIRP – Ant Gain(dBi) + Cable/Connector loss (dB)
Ant Gain dBi = Ant Gain dBd + 2.15 dB
Omni Gain (dBi) = 6 + 2.15 = 8.15dBi
Max TX power = 36dBm – 8.15dB + 2.5dB = 30.35dBm
Hence Max TX power = 30dBm