What is the 2.4 GHz band U.S. non-overlapping channel?

Question

Options

• A2, 7, 12
• B3, 8, 13
• C1, 6, 11
• D3, 7, 13

• A
  6% (2)
• B
  13% (4)
• C
  78% (25)
• D
  3% (1)

Explanation

In the 2.4 GHz band, each Wi-Fi channel is 22 MHz wide but channels are spaced only 5 MHz apart, causing adjacent channels to overlap. Channels 1, 6, and 11 are exactly 25 MHz apart from each other, making them the only three channels in the US (which allows channels 1-11) that do not interfere with one another.

Options A (2, 7, 12) and B (3, 8, 13) are wrong partly because channels 12 and 13 are not legally available for standard use in the United States. Option D (3, 7, 13) fails on both counts: channel 13 is unavailable in the US, and channels 3 and 7 are only 20 MHz apart, meaning they still overlap. Any set of three non-overlapping channels must be spaced at least 25 MHz (5 channels) apart to avoid interference.

Memory tip: Count by fives starting at 1 -- 1, 6, 11 -- and note that 11 is the highest channel permitted in the US, which confirms you have reached the end of the valid range.

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