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。 [upl-image-preview uuid=6a2797d0-2fe0-49f5-aff7-70035a2fc12f url=https://storage.hamcq.cn/2024-12-29/1735455187-855925-screenshot-2024-12-29-14-49-31-67-e39d2c7de19156b0683cd93e8735f3482.jpg alt={TEXT?}]

你猜，馈线为啥有一层屏蔽层

我猜屏蔽层是用来增加电缆的强度

@"[未知用户]"#p47941 你答对了

不影响，，我房顶下来4根馈线，一组220，一组485

一般来说不影响就摄像头那点电流连辐射信号都出不去多少

同轴馈线不怕边上有导线，也不怕边上有直流电流。有影响的反而是劣质开关电源。我买的一百来元给电台电瓶充电的充电器，就干扰特别大

@"BG8AMG"#p48033 家用摄像头、机顶盒、路由器的电源是不是开关电源？如果是的话就比较麻烦了，路由器得常开着，我这根线离电源还是比较近的。

@"[未知用户]"#p48069 看质量，有些用电器的劣质开关电源偷工减料，里面没有抗干扰电路，这样对外界影响很大

What is the impact of parallel 12V power lines on the transmission to shortwave feeders?

Bg2gKg

I need to install a shortwave antenna into the house through an existing hole in the window frame. Currently, there is a coaxial cable and a 12V power cable for a camera passing through the hole. The fiber optic cable should not affect the transmission of light signals. However, will a 12V DC power cable passing through the existing hole significantly impact shortwave transmission? If so, what methods can be used to minimize this impact?
In the diagram below, points A and B represent the locations of the holes. The horizontal distance between them is 50 cm, and the vertical distance is 40 cm. There is free space between the two points, with a width of approximately 4-5 cm at the hole location.

BG2EFX

没听说有啥影响

Bg2gKg

BG2EFX AI misjudged me.😂

dovesky

Do you know why shielded cables have a shielding layer?

dovesky

Do you know why shielded cables have a shielding layer?

Bg2gKg

I guess the shielding layer is used to increase the strength of the cable.

dovesky

[未知用户] You got it right.

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.

Bg2gKg

BG8AMG Received successfully, thank you.

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