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AWR2243BOOST: Errors in chirp data giving lines in doppler spectrum

Part Number: AWR2243BOOST

Dear TI Support,

I have been making measurments on the TIAWR2243 using the DCA1000 and I am seeing errors in some of the chirps as shown in the plot below:

The chirps at the start of the frame (128 chirps per frame) are OK but from chirp ~50 onwards there is an error in the chirps every 6 chirps.   

I am using the chirp settings shown in the figure.

So do you know what might be causing this?

Best regards


Jonathan