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The phase consistency cannot be guaranteed when measured multiple times using VST

I have two VST-5644 modules for measurement. I found that the phases of the received signals are different every time with a 'init, fetch data, abort' loop. My preliminary judgment is that repeated ‘init and abort’ cause the RF front end of the VST to mix different initial phase each time. 

I don't know any good way to get the initial phase of VST or maintain the same initial phase every time for calibrating received signal.

 

Thanks a lot!

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