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What may be at work here

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In Reply to: RE: Excellent and Cheap Tweak posted by Dr.Phil on March 12, 2009 at 09:12:17

I'm not sure that you're really working with a grounding phenomenon with just the copper union sleeves. It might not be a true "shielding" phenom either. I suspect it's actually a field damping situation, similar to what CF handles in some ways (though my CF sleeved plugs do also show some AC field via the detector).

If that's the case, then several metals ought to work with varying degrees of effectiveness. In fact, a sleeve of 2-3 metals might work best if that's the underlying principle. I can't remember my "permeability" tables, but as I recall (imperfectly) copper, aluminum, and nickel ought all to work in such an application.

CF works best on plugs if you cover it past the place where the wires bifurcate inside the plug, which is usually near the back of the plug barrel. So if you're sleeving with CF, you'd run from the front of the plug barrel to as much as an inch beyond the back of the barrel over where the strain relief might go.

I'm curious what would happen with a 3 way combo of metals, plus a CF sleeve. No time to check that now, though.

Of course, I'm not an EE, my physics is 40 years in my past, and I've been known to be wrong enough times, so YMMV!!! LOL

Follow Ups:

Multiple properties combined - WilHenry 12:50:44 03/20/09 (1)
I looked into the composition of the TI-shield. Besides the copper layers the 'alloy 49' used is an alloy of iron and nickel with traces of several other elements. Of course the exact composition of alloy 49 was not available. The TI shield is useful in many applications because it is flexible, thin, and light. I found several sites of contractors who build large rooms shielded by TI Shield, the joints are soldered. Wouldn't it be nice to pick up a few of their scraps? Bill
- YOu are correct - bartc 13:58:38 03/20/09 (0)
  TI shield is a triple layer (copper-Alloy49-copper) sandwich. The middle layer is ferrous. There are specific reasons for this that make it a very effective shield and damper, but don't ask me to explain them! I did research these relative to all the correlates of a Farraday Cage, BTW; you can do your own extensive search on that.
  
  TI is expensive and you currently have to order sheets, while you can only use it sparingly without going into sonic loss, instead of gain, so I'd love some of the "scrap"!
  
  I'm not so sure that TI would be good in the application we're discussing, but wouldn't say not to try it if you've got some lying arouns. The previous threads on using TI were pretty consistent (as is my own experience) that grounding with the proper AWG wire enhances TI's benefits.
I believe the - unclestu52 03:57:30 03/20/09 (2)
sleeve simply traps the EMF field being emanated by the wiring. Copper will of course trap the electrical field induced, other metals will trap the magnetic field induced, particularly nickel and other ferrous material.

In the case of the magnetic type materials, the Power Wraps long endorsed by Al Sekela work on trapping the magnetic fields induced as does the Shun Mook cable jackets.

If you want a cheap way to try out the theory try the flanged tailpieces available at any plumbing supply house as I recommended below.

Stu
- RE: I believe the - rick_m 09:49:02 03/20/09 (1)
  I'm trying it Stu. Dug around in the plumbing box yesterday and even managed to find a chunk that hasn't been used! Result so far: maybe...
  
  Regards, Rick
  - You can - unclestu52 12:14:52 03/20/09 (0)
    slip it over any cable. I like to slide it over the interconnects first, particularly from the source electronics and then work back. It does not have to be placed over the terminations and needs to grounding straps as it is primarily working on magnetism. Power cables come last in my list of most effective installations, at least for the sleeve.
    
    Stu
    
    Edits: 03/20/09

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