BLE radio frequency calibration

[xianke]

I want to to ensure the stability of BLE connection for BLE frequence calibration,but i don't know how to get the nordic into the test mode and broadcast the empty packet.who can help me to deal with it?

[cbd]

For this type of work, including certification, I would suggest that you use Direct Test Mode. This allows you to set the channel frequency and trigger continuous transmission of the carrier wave without any data modulation. Incidentally, it does have a mode that will broadcast a known packet sequence as it's a requirement for certification.

You can place your device into Direct Test Mode and control the sequence yourself, but normally it's best to have a jumper on your circuit that allows a UART to be connected to an external control device and have your code set to respond to external commands.

[xianke]

OK，are these external commands defined by myself? If not where can I get these commands?another questions:if finally i get the frequence  in the scope of 2.399990GHz~2.410010GHz,when i get out the Direct Test Mode,how can I hold it?

[Martin Lesund]

Hi xianke,

Have you read the documentation for DTM?

[xianke]

OK,let me see.