Guide 10: Non-Overlapping Channel Selection — The 1, 6, 11 Golden Rule

In the 2.4 GHz Wi-Fi spectrum, channels are spaced just 5 MHz apart, but each transmission occupies roughly 20 to 22 MHz of spectral width. As a consequence, channels overlap heavily with one another unless you use specific non-overlapping channels.

Co-Channel Interference vs. Adjacent Channel Interference

If two routers share Channel 6 (Co-Channel), Wi-Fi protocols (CSMA/CA) politely take turns transmitting packets. But if your router is on Channel 5 and your neighbor is on Channel 6 (Adjacent-Channel), the signals act as raw unstructured noise, corrupting packets and triggering severe packet loss.

The Rule: On 2.4 GHz, use ONLY Channel 1, Channel 6, or Channel 11. Run a Wi-Fi analyzer app to see which of the three has the lowest utilization in your immediate building.