Tweakers' Asylum

Has anyone measured the impedance of Chris Ven Haus's Cat5 27 pair speaker cables??

69.132.143.213

Julien43

A

I'd like to build some RF filters and I haven't been able to locate any measurement info on this design.

I can't afford to purchase the test equipment needed to take such measurements.

Chris does mention that the capacitance falls somewhere between Kimber 8TC and Goertz cables but that won't get me close enough to impedance match the filters to the cables.

Any thoughts you have on this subject are most appreciated!

Julien
"There's someone in my head, but it's not me"

Follow Ups:

Why don't you.. - rwiley 16:27:34 05/14/10 (3)
ask Chris? He might be able to get you in the ballpark. Also, his Chela speaker cables are a low inductance design and perhaps a similar characteristic impedance (to the Cat 5 design)...worth a try.
- RE: Why don't you.. - Julien43 17:11:52 05/14/10 (2)
  Actually I was hoping word of this post might get back to him.
  
  I guess the direct approach is best
  
  Julien
  "There's someone in my head, but it's not me"
  - Without the actual L/ft and C/ft measurments.... - rwiley 08:33:02 05/15/10 (1)
    you will probably have to assume that Chris is right (i.e., the Zc of the Cat 5 falls between the Goetz MI-2 and Kimber 8TC) and in that case the Zc of your Cat 5 should fall between 5.1 ohms (MI2) and 10.1 ohms (8TC).
    Note: These figures are from a test/review in the May 2004 issue of AudioXpress magazine and were calculated from actual measurements which differed "slightly" from manufacturers specs.
    
    Edits: 05/15/10 05/15/10
    - Thanks for chiming in - Julien43 19:00:55 05/18/10 (0)
      That should get me in the ballpark.
      
      Much appreciated!
      
      Julien
      "There's someone in my head, but it's not me"
RE: Has anyone measured the impedance of Chris Ven Haus's Cat5 27 pair speaker cables?? - Mike B. 10:00:44 05/14/10 (6)
julien, can we assume you want the measurement of resistance per foot?
- No, he wants the unit inductance and capacitance. - Al Sekela 11:55:54 05/14/10 (2)
  The resistance should be negligible in calculating the cable impedance at RF.
  - Thanks Al /nt\ - Julien43 14:42:52 05/14/10 (0)
    nt
    Julien
    "There's someone in my head, but it's not me"
  - RE: No, he wants the unit inductance and capacitance. - Mike B. 12:20:25 05/14/10 (0)
    brain fart. I was thinking impedance
- RE: Has anyone measured the impedance of Chris Ven Haus's Cat5 27 pair speaker cables?? - Julien43 11:10:42 05/14/10 (2)
  Yes, per foot or meter what standard unit anyone has would be great.
  Even if someone measured the impedance of some particular length as long as they include the length that was measured so I can run the numbers.
  Thanks for your response!
  [edit]
  I didn't read your response as carefully as I should have. I saw the unit of measure and the rest just blew by me. I do have a decent multi-meter so I can measure resistance. I see that Al came to the rescue.
  [end edit]
  
  Julien
  "There's someone in my head, but it's not me"
  
  Edits: 05/14/10 05/15/10
  - RE: Has anyone measured the impedance of Chris Ven Haus's Cat5 27 pair speaker cables?? - Maxamillion 13:01:13 05/14/10 (1)
    The length doesn't matter so long as the L and C were both measured on the same length, since the formula for characteristic impedance is a ratio of L to C.
    - "I See" said the blind man. Thanks! nt - Julien43 14:32:49 05/14/10 (0)
      nt
      Julien
      "There's someone in my head, but it's not me"

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