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BLE on sidekick spectrum view

BLE’s advertising channels are 37, 38, and 39, and we also see something between 8-9 that’s actually also BLE but one of the data channels, and you see current data go over it.

Bluetooth Smart or BLE frequency channels

There are actually more data channels used by BLE as well as Zigbee, here is an illustration 

dark-blue for BLE’s and ZigBee’s data channels which do not overlap with WiFi channels (and are free from WiFi interferences).

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