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LMH1297做均衡器时使用90度插入式BNC,70米同轴电缆传输12G视频信号(P60hz ,分辨率3840x2160)时信号不稳定(同样的PCB处理方式有的有信号有的无信号),20米同轴电缆传输同样的信号无问题,请教各位高手有啥改善方法,谢谢!