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AWR2243: hardware trigger issues

Part Number: AWR2243

Hello everyone,

I use hardware trigger to start the frame collection, but after the first frame the received signal becomes very noisy and in some cases the peaks are not clear in the signal FFT. I have the signal connected to pin 9 in J5 for the sync in and pin 4 connected to ground. 

If I use software trigger than everything is fine. 

Do you have any insight on why this could happen and how to solve it?

Thank you in advance