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AWR6843ISK: Transmitted Power During Startup

Part Number: AWR6843ISK

The evaluation board operating with the demo webpage (https://dev.ti.com/gallery/view/mmwave/mmWave_Demo_Visualizer/ver/3.6.0/) transmits a number of times before starting the regular frame chirps. For example, the attached plot shows the measured power around 62GHz during startup. The area in the red box seems to be additional transmissions before the regular frames start. Can you tell me what transmissions are going on during this time? Is this normal behavior that we need to consider? And are there any implications with FCC compliance? Any insight would be appreciated.