An installation uses a 21dBi parabolic dish. It is connected to the 802.11n radio via low loss
antenna coax rated at 4dB loss/100 feet. After testing, it has been determined that 2mW of power
will be lost in the cable. An EIRP producing 200mW is desired. What should the transmit power be
set to?
A.
8mW
B.
3dBm
C.
3.16mW
D.
5mW
3.16
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How did you arrive at 3.16??
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EIRP(db)= Transmit Power (dBm)? – Cable Loss (db) + Antenna gain (dBi)
Cable Loss= 2mw Converts to dB=3.01
Antenna gain = 21dBi
EIRP 200mw convert to Db gives 23.01
So
Transmit Power (dBm)= EIRP(db)+ Cable Loss (db)-Antenna gain (dBi)
Transmit Power (dBm)= 23.01+3.01-21
Transmit Power (dBm)= 5.02
Converts 5.02 dBm to = 3.17
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awesome
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