The biggest source of Wi-Fi interference is… Wi-Fi itself.
This is especially true on the 2.4 GHz band, where we only have 3 clear channels: 1, 6, and 11. Avoid adjacent channels (2, 3, 4, 5, 7, 8, 9, 10), which act like static or buzzing you hear when your radio isn’t tuned to the right station.
The Wi-Fi protocol can still function even when there is interference from other Wi-Fi networks or devices. For example, imagine you’re listening to the radio and you walk near another station broadcasting on the same frequency—you start hearing both stations switching back and forth.
In Wi-Fi, this happens around –82 dBm through a mechanism called signal detect, which is the protocol’s detection threshold for another communication. With signal analysis tools (RSSI), check that it does not exceed –82 dBm (moving toward 0, –72, –62, etc.), and detect any other communication occurring on the same channel.
Another mechanism that can silence Wi-Fi communication is energy detect, which kicks in around –62 dBm. At this point, your Wi-Fi detects a strong energy source at –62 dBm or higher (toward 0), which can completely block your Wi-Fi communication.
For example, a non-Wi-Fi wireless camera can take up all the airtime, preventing your Wi-Fi network from transmitting at all…
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