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IWR6843AOP: Two tones appear when measuring EIRP using mmWaveStudio

Part Number: IWR6843AOP

Hi,

I was trying to measure EIRP of IWR6843AOP EVM using mmWaveStudio.I complete the setting in the connection tab first,and do static config and init rf in StaticConfig tab.Then I come to ContStream tab,click the setting button in the StreamConfig zone with all the parameter remaining default,and click "enable" to enable the stream.Then two tones appear on the spectrum analyzer,one of which corresponding to the tone I setted.I was confused where does the other tone come from?Is there any setting wrong?