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Question 65 - CWNA-109 discussion

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The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz). What is the center frequency of channel 4?

A.
2.427
Answers
A.
2.427
B.
2.422
Answers
B.
2.422
C.
2.413
Answers
C.
2.413
D.
2.417
Answers
D.
2.417
Suggested answer: A

Explanation:

The center frequency of channel 4 in the 2.4 GHz band is 2.427 GHz (2427 MHz). The center frequency of a channel is the midpoint of its frequency range, where the signal strength is highest and most concentrated. The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz), as given in the question. The center frequency of each subsequent channel is obtained by adding 5 MHz to the previous channel's center frequency, since the channels are spaced 5 MHz apart from each other in this band. Therefore, to find the center frequency of channel 4, we need to add 15 MHz (5 MHz x 3) to the center frequency of channel 1:

2.412 GHz + 0.015 GHz =2.427 GHz

Alternatively, we can use a formula to calculate the center frequency of any channel in the 2.4 GHz band:

Center frequency (GHz) =2.407 + (0.005 x Channel number)

Using this formula for channel 4, we get:

Center frequency (GHz) =2.407 + (0.005 x 4)

Center frequency (GHz) =2.407 + 0.02

Center frequency (GHz) =2.427Reference:1, Chapter 3, page 85;2, Section 3.2

asked 16/09/2024
David Romano
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