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Shielded CAT-5 that is more flexible

Discussion in 'Electronic Components' started by Joerg, Jun 5, 2008.

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  1. Joerg

    Joerg Guest

    Hello All,

    Does anyone have a link or hint regarding shielded CAT-5 which is as
    flexible as the better non-shielded patch cables?

    Regular shielded is quite stiff. During EMC we discovered that a cable
    inside a unit needs to be shielded and it has to go through a harness
    that will be bent back and forth whenever a drawer mechanism opens. Not
    every minute or so, just once in a while. It just can't be too stiff.
     
  2. Joerg

    Joerg Guest

    Thanks, Jeff. I didn't remember "STP". Dang, I think I am getting old
    here ...
     
  3. JosephKK

    JosephKK Guest

    And single braided over shield is more flexible than any foil shield
    version, maybe even 45 % coverage would pass and it is more flexible
    than 95 % varieties.
     
  4. Eeyore

    Eeyore Guest

    My studio installation guy says he know just the stuff you need, it's about
    as flexible as microphone cable.

    He gets it fron Canford Audio in the UK, I haven't found the part number
    though (their search engine is rubbish). He has something like 10-20 m on
    hand if you only need to purchase a small length. You could pay him via
    Paypal or whatever (that's cheapest).

    Contact him on

    Graham
     
  5. Hi Jörg,
    be careful, CAT5 cable doesn't like radius under two inches AFAIR. If a
    cable is too flexible it may tend to untwist itself and then you may get
    garbage...

    Regards

    Marte
     
  6. Joerg

    Joerg Guest

    Well, so far I have only seen Foil shield. Do you remember a brand with
    braided shield?

    I did find dual-pair microphone cable which would work since LAN only
    needs two pairs. But it won't be so easy to get a standard RJ jack
    connected in production.
     
  7. Joerg

    Joerg Guest

    Thanks, Graham. However, we'd need quite a bit more than that, it'll be
    for production.

    Meantime I did find some microphone cable that could work though. I was
    surprised that they had dual twisted pairs.
     
  8. Joerg

    Joerg Guest

    We won't go much under 2". Slight loss of twisting would be ok here
    since data rates are really low.
     
  9. Eeyore

    Eeyore Guest

    If that's 'starquad' it's unsuitable. Totally different impedance.

    Graham
     
  10. Joerg

    Joerg Guest

    Ok, but it's only for a 30cm run each system, the rest would be CAT5 and
    we don't have to run 1Gb/sec. Thing is, we don't have any music stores
    around here where I could take a look. Well, you can buy a fiddle and a
    twang box of course, along with the proper Stetson, saddle and boots.
    But no fancy electric stuff. Since you are an audio guy: Is that Star
    Quad really flexible?
     
  11. Eeyore

    Eeyore Guest

    Not to my knowledge it isn't. Never used the stuff though. In fact it's very rarely
    used at all, just when required to 'ultra-eliminate' induced voltages into the mic
    signal cables. There are two pair twists one going clockwise, one anti-clockwise
    you see. You wire them in parallel and it should ALL cancel out.

    This appears to be the Canford cable I mentioned.
    http://www.canford.co.uk/commerce/item_31-860_22218.aspx
    http://www.canford.co.uk/commerce/resources/catdetails/5285.pdf

    Graham
     
  12. Joerg

    Joerg Guest

    Hmm, that has the usual foil shield like the Belkin shielded CAT5.
    Belkin is one of the more popular brands out here.
     
  13. whit3rd

    whit3rd Guest

    Mainly Ethernet terminations aren't shielded, so there's
    no 'ground' connection in the RJ-45 plug. If you go to the
    shrounded connectors, the compatible shielded cable is stiff
    jacket/foil-shield over (?solid) wires.

    Could you ground a braided tube at the chassis and on the
    drawer, and just route a stranded CAT5 cable through that?
     
  14. Eeyore

    Eeyore Guest

  15. Eeyore

    Eeyore Guest

    They claim it's their own though, see the pdf file.

    Part of the trick is a thinner than usual jacket of high flexibility. My install friend
    says it's the bee's kness.

    Graham.
     
  16. JosephKK

    JosephKK Guest

    I have this joy/frustration with people that beat me at thinking
    outside of the box.
     
  17. Joerg

    Joerg Guest


    Thanks, I did get the link. Importing is a hassle though and meantime I
    found a domestic source for really flexible data cable. So in case
    someone else is in the same pickle some day:

    http://www.sabcable.com/categoryDetail.php?catID=2

    Thanks to all for your suggestions.
     
  18. Joerg

    Joerg Guest

    That's what they have in the system now. It's a pain in the neck in
    production (very complex mechanics) and then there is the concern of
    chafing.
     
  19. JosephKK

    JosephKK Guest

    Adhesively bond the mesh to the jacket. Select the adhesive
    carefully.
     
  20. Joerg

    Joerg Guest

    Production folks don't like that kind of stuff :)

    Anyhow, as posted in my response to Graham we've found a domestic source
    that might work:

    http://www.sabcable.com/categoryDetail.php?catID=2
     
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