When calculating the link budget for a wireless point-to-point bridge, the engineer notices that one antenna has its gain marked as 2.85 dBd. With a 20-mW access point and 3-dBi loss for the cable, what is the approximate EIRP?
The correct answer is C: 22dBm.
Since the antenna is rated in dBd, you first need to convert to dBi to compare properly with the cable loss.
TO convert dBd to dBi, you ADD 2.15dB.
2.85dBd + 2.15db = 5dBi
So the antenna Gain would be 5dBi, and the cable loss would be 3dBi.
Starting with 20mW (or 20dBm), the EIRP would be 22dBm.
20dBm (TX power) - 3dBi (Cable loss) + 5dBi (Antenna gain) = 22dBm (EIRP)
You got one thing wrong here; 20mW is not equal to 20dBm, but 13dBm, so...
13dBm (TX power) - 3dBi (Cable loss) + 5dBi (Antenna gain) = 15dBm (EIRP)
The correct answer is A: 15dBm
upvoted 4 times
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