Bluetooth

Bluetooth operates in the 2.4 GHz ISM radio band, specifically between 2.400 GHz and 2.4835 GHz. To avoid interference, it divides this band into 79 channels of 1 MHz each and uses a technique called frequency hopping to rapidly switch between them, up to 1,600 times per second.  This video explains how Bluetooth uses frequency hopping to avoid interference: 1mBina BhattYouTube · 14 May 2021Frequency band: 2.400 GHz to 2.4835 GHz  Number of channels: 79, each 1 MHz wide  Channel frequencies: From 2402 MHz to 2480 MHz, with channel \(k\) being \(2402+k\) MHz, where \(k\) is from 0 to 78  Frequency hopping: A method where Bluetooth devices rapidly switch between channels to avoid interference from other devices like Wi-Fi routers or microwaves that also use the 2.4 GHz band.  Adaptive Frequency Hopping (AFH): A more advanced form of frequency hopping that detects and avoids busy channels, further improving reliability.