advertising channels

[hrg]

Hi The BLE module operates in 2.4 GHz spectrum with 3 advertising channels & 37 data channels . Why advertising require 3 channels ? is it possible to make it to one channel advertising ?

[Asbjørn]

3 channels for advertising (and their frequiencies) are specified by the Bluetooth core spec. They are selected to make the advertising and establishment of a connection robust yet still efficient. It's a trade off between latency and avoiding interference. So the softdevice itself takes control over the advertising and the channels used. For every advertising event all three channels will be used and currently it's not possible to select which one.