CWNA: Certified Wireless Network Administrator v107 — Question 6

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

Correct answer: B

Explanation

To calculate the EIRP, first convert the 50 mW signal to dBm, which is approximately 17 dBm. Then, subtract the cable loss of 3 dB, resulting in 14 dBm. Finally, add the antenna gain of 9 dBi, giving a total EIRP of 23 dBm. Therefore, the correct calculation does not lead to any of the other options since they either underestimate or overestimate the EIRP.