Bg2gKg 准备将来短波馈线从窗框上的已有穿线孔入户，孔内现在有一根宽带的光纤和一根摄像头的12V电源线穿过。光纤传输光信号应该没影响，请问在不另外穿孔的前提下12V的直流电源线对短波传输影响大吗？如果影响大的话用什么方法可以减小影响？ 下图中A、B两点为穿孔的位置，两点水平距离50cm，垂直距离40cm，两点间为自由空间，穿孔处宽约4、5cm。
BH9FPK It doesn't affect anything. I have 4 feeder lines coming down from the roof, one set for 220V and another for 485V.
BD8CBP Generally, it doesn't affect anything, not even the small current used by the camera, nor does it interfere with any radiation signals.
BG8AMG I don't mind coaxial cables having wires on the edges or being exposed to DC current. The real problem is cheap power supplies. The charger I bought for about 100 yuan to charge my radio's battery caused a lot of interference.
Bg2gKg BG8AMG Are the power supplies for my home camera, set-top box, and router switching power supplies? If so, this is more complicated. The router needs to be constantly powered on, and since the cable is close to the power source, it's a concern.
BG2EWI Bg2gKg Regarding quality, some substandard power supplies have poor-quality switches that use inferior materials and lack shielding circuits, making them highly susceptible to external interference.
BG8AMG [未知用户] If the background noise in your home is particularly high, you can systematically disconnect and test each power supply. Replace those that are causing significant interference. However, the background noise from my set-top box and router's power supplies doesn't seem to be as high as the ambient noise. The only source of significant interference I've identified is the charger for my phosphate iron lithium battery, which immediately reports an error when used.
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