SAMR21 RF_Test

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I'm used the SAMR21E16A chip and encountered the following problems when did RF debuged:
1. When doing RF debugging, we need to use a spectrum analyzer to test the output power, frequency offset, 2nd and 3rd harmonics, etc. How to make the DUT transmit continuous carrier wave(CW)?
2. When doing RF debugging, we need to measure the minimum receiving sensitivity of the DUT at 250kb/s, please tell me the test code and test steps?
Thank you very much for your answers or other ways of answering.