|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
|
|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
In Reply to: Wiring possibilities... posted by Al Sekela on June 30, 2007 at 13:36:24:
With me being involved as an ameteur AM radio station operator/ local wireless and wired network administrator (of my home)/ member of a high techish suburban community/ near bustling commercial and military communications and navigations signal hubs my audio equipment in is in the middle of what might very well be considered RF hell. I see the single ground wire, dedicated lines bundle, in conduit, in-wall, service run as a great weapon against RF and significant reducer of the length of the "necessary" ground loops a seperate dedicated lines suffers from and can't seem to let go of this thing. The problem is as I understand it, the only way to pull off this holy grail desired feature of a single ground there has to be a conduit in order to satisfy code. It is safe to assume that if I didn't use the lowest electrical impact PVC conduit material that the conduit approach is no longer an option and my dreams of this single ground wire system go poof in a wisp of smoke.
Obviously PVC isn't a perfect dielectric material so I understand your comment about how it may still be an imperfect solution signal integrity wise. My gut feel is that is less of an issue in my environement than RF immunity is. I don't see a way around that barring finding some more electrically inert conduit material. The other problem with this approach that you mentioned, vibration problems, can be dealt with almost entirely. I can as you point out mechanically damp the conduit if necessary. Maybe some of that expando foam insulation stuff in the wall surrounding a rubber tape wrapped bundle might keep it all holding still.
There are also imperfections in the seperate dedicated line approach. It introduces longer parallel lengths of ground conductor. This means more potential for noise energy to be injected into the signal vs the single wire approach via crosstalk and radio signal reception. To battle the RFI problem the bundle can be more tightly packed. However the tighter packed bundle would have the tradeoff of being more likely to have crosstalk issues. To battle crosstalk issues the bundle may be more loosly packed but that means a tradeoff in RF immunity performance.
What confuses me about your post is it's tough to tell exactly why you prefer a seperate set of dedicated lines over a bundle in PVC that has one low impedance ground wire. The question is: are the noise/signal distortions tradeoffs for the conduit approach worse than the noise/signal distortions tradeoffs for the seperate dedicated lines outside conduit approach you are recommending, and under what conditions is it true? I guess my big problem here Al is my little voice inside is contradicting what you are saying slightly. This worries me a little because your obviously an intelligent and thoughtful fellow. This is a general topic which is difficult to talk about in specifics since everyones situation is different.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Wiring possibilities... - Ugly 10:58:16 07/01/07 (2)
- A single ground wire is preferred if possible. - Al Sekela 14:48:24 07/01/07 (1)
- RE: A single ground wire is preferred if possible. - Ugly 14:05:12 07/02/07 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
