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Coaxial Capacitor?



Hi All,
  Has anyone considered using sections of RG-8/U coaxial cable as a
homebrew HV capacitor? The insulating dilectric is solid polyethylene.
The inner conductor is solid copper as is the braid shield.
  The capacitance is 29pf per linear foot from an Aplha Wire catalog.
Then 34 one foot long bundled sections equals a .001 uf cap.
  Start with a bundle of 15 inch segments. Strip the outer braid an
inch or so from one end. Connect all center conductors together,
likewise connect all braid sections, rolled back an inch or so from
the opposite end, together. Place in a 3 or 4 inch OD tube, (maybe oil
fill?) and cap the ends (no pun intended) and extend a stud terminal
to the conductors.
  I'm sure if this worked well someone would have tried it by now and
it would be spun off to others. So where's the flaw? Too costly per
capacitance value? Area of conductors? Thickness of dilectric?
Difficulty of assembly?
 Just thinking, I've never tried it. Comments??

Regards,
Bob Wroblewski
Dracut, MA




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