CWNA: Certified Wireless Network Administrator v108 — Question 16

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?

Answer options

• A. 26 dBm
• B. 13 dBm
• C. 23 dBm
• D. 10 dBm

Correct answer: C

Explanation

To calculate EIRP, you start with the transmitter power in dBm, which is 17 dBm (50 mW), subtract the cable loss of 3 dB, resulting in 14 dBm, and then add the antenna gain of 9 dBi. This gives an EIRP of 23 dBm, making option C the correct answer. The other options do not accurately reflect the calculations based on the given values.