Relationship between the shielding layer on the outside of the feeder and ground noise.

someham

在压接馈线头的过程中，我发现如果将馈线的屏蔽层和馈线头外金属部分连接，手台观察到的无信号状态下信号强度为 S0。但是如果不相连接，无信号状态下的信号强度能达到 S6。

但是我买来的新馈线测得的底噪也是 S6，这是否意味着我买的这个厂家没接好屏蔽层和馈线头？

BG5VQE

I think it's clear that we haven't done a good job.
If you have a multimeter, measure the resistance between the two metal contacts on either side of the cable to see if it's conducting.

someham

BG5VQE I don't have a multimeter, but I do have a multimeter that can test continuity. When I tested it, it showed continuity. So, the background noise is definitely related to this shielding layer, right? I'll try buying from a different store next time and see if that makes a difference.

BG5VQE

someham Yes, the shielding layer is still very important.

dovesky

The shielding layer is called a "shielding layer" because it prevents signals transmitted within the feeder from interfering with external devices, and also protects the feeder from external interference. Furthermore, it can prevent the feeder itself from being used as an antenna (see the example of using a stripped feeder as an emergency antenna). Therefore, proper soldering or crimping is essential when manufacturing feeders.

someham

dovesky Thank you for the explanation; I now have a much better understanding of the principles involved.

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