CWNA: Certified Wireless Network Administrator v109 — Question 13

An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain. What is the power level at the Intentional Radiator?

Answer options

• A. 500 mw
• B. 250 mw
• C. 25 mw
• D. 1000 mw

Correct answer: C

Explanation

To find the power level at the Intentional Radiator, you need to account for the 3 dB loss in the cable, which reduces the signal power to 25 mW (50 mW - 3 dB = 25 mW). The 16 dBi gain from the antenna does not apply to the transmitter's output but rather to the effective radiated power. Therefore, the correct answer is C, and the other options are incorrect as they miscalculate the loss and gain effects.