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CC3220SF-LAUNCHXL: Tx CW function fail on the CC31XX/CC32XX radio tool

Part Number: CC3220SF-LAUNCHXL

Dear Sir,

I'm use the the CC31XX/CC32XX radio tool to check performance of CC3220SF-LAUNCHXL (EVB).

Functions almost are ok, becuase the Tx CW function have a bug.

Tx CW function can't transmit any signals on tone setting =0 but it can transmit the correct signal when the tone setting  -2, -1, 1, 2....

Could you teach me how to check the frequency error??