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一、Application situation Application DVR OS Linux Kernel version 4.15.0 WIFI interface USB Special Approval for WIFI function MIC认证 The point description DFS Master test，无法监听到雷达信号。 二、Relative preparation  DFS（Dynamic Frequency Selection） DFS is in order to detect the frequency of the army, then avoid to use it. DFS scope：5250 MHz~5350 MHz,5470 MHz~ 5725MHz DFS Master device: Radar pulse detection is required. That isContinue reading “How to get MIC certification based on Realtek chipset”