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@Ortlepp-Enrico Please check other threads, here is one of them.
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@Ortlepp-Enrico
This strange radar picture is due to interferences by WiFi sources.
More exactly when DFS of RLAN-WiFi equipment is not correctly operating :
https://en.m.wikipedia.org/wiki/Dynamic_frequency_selectionBy the way, you asked the same question about strange circle in radar layer two weeks ago. Hope it's clear now.
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