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Question 23 - CWNA-109 discussion

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A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?

A.
26 dBm
Answers
A.
26 dBm
B.
13 dBm
Answers
B.
13 dBm
C.
23 dBm
Answers
C.
23 dBm
D.
10 dBm
Answers
D.
10 dBm
Suggested answer: C

Explanation:

To calculate the EIRP at the antenna element, we need to add the transmitter output power, subtract the cable loss, and add the antenna gain. All these values need to be converted to dBm first, if they are not already given in that unit. In this case, we have:

Transmitter output power = 50 mW = 10 log (50) dBm = 16.99 dBm Cable loss = 3 dB Antenna gain = 9 dBi

EIRP = Transmitter output power - Cable loss + Antenna gain EIRP = 16.99 - 3 + 9 EIRP = 22.99 dBm

Rounding up to the nearest integer, we get23 dBmas the EIRP at the antenna element12.Reference:CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 92;CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 88.

asked 16/09/2024
Jeff Silverman
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