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Re: [TCML] Where to mount the HV Transformer? Underthe coil orotherwise ?
RG-8 OR RG-11 has an outside diameter of 0.405 inches vs RG-58 at only 0.195
inches. I agree that RG-8 or RG-11 would be a better choice.
RR
----- Original Message -----
From: "Rich Schmuke" <rdj@xxxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Wednesday, June 25, 2008 6:27 PM
Subject: RE: [TCML] Where to mount the HV Transformer? Underthe coil
orotherwise ?
Uh , RG-58 are you sure you don't mean RG-8 or RG-11 size, even RG-8X has a
better HV rating then 58. I use a lot of different coax types on my antenna
systems but try to avoid RG-58. They only time I use RG-58 is for a balun
winding.
Rich , Kd0zz
As an act of plagiarism . Disclaimer: Any errors in spelling or facts are
transmission errors.
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: Wednesday, June 25, 2008 8:07 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Where to mount the HV Transformer? Under the coil
orotherwise ?
Agreed! RG-58 is the way I would go. I use it for my antenna (CB), and
it's huge and heavy duty. I haven't used it for hv transmission, but
I've thought about it.
David, thanks for letting us know your success with the Green Monster
using RG-58. I've got "lots" of it and should put it to use. I assume
you stripped the rf braid back?
Take care,
Bart
David Rieben wrote:
Hi Jeremy,
You would need the heavy duty coax cable, like RG-58?.
That cheap junk that comes to the back of your cable TV
box uses foam insulation and would promptly fail under the
high voltage stress of Tesla coil transmission line service. I
personally like to use surplus x-ray cable for this purpose.
It is basically a coax cable on steroids and us usually rated
at around 75 kVDC standoff between the inner conductor(s)
and the outer braid. It is typically around 3/4" in diameter
and I have had very good success using this as a transmis-
sion line for the HV from my pole pig to my Green Monster
Tesla coil. http://www.dawntreader.net/hvgroup/david/gm.html
David Rieben
----- Original Message ----- From: "Jeremy Scott" <supertux1@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, June 25, 2008 12:36 AM
Subject: Re: [TCML] Where to mount the HV Transformer? Under the coil
orotherwise ?
I read the coax idea off of this site:
http://www.pupman.com/safety.htm
Somewhere in there it says this:
"The transmission line between your high voltage transformer and your
tesla coil is another potential source of electrocution. This should
be constructed using neon sign wiring (rated to 40 kV) or thick
coaxial cable like RG-8A/U or RG-11A/U. If using coaxial cable, use
the inner conductor for the high voltage, and strip back the outer
braid about 6-12 inches from each end. Connect one end of the braid
to your RF ground. Leave the other end unconnected so it does not
form a current loop. Some coilers also place their high voltage
cables inside a plastic conduit, which is laid on the floor. This
also protects the cable somewhat from strikes."
I was just wondering if anyone has any experience doing it that way.
This is basically the 50 and 75 ohm impedance cable that you can get
anywhere. They have a thick PTFE insulation between the core
conductor and the braid which I think would be ideal for isolation.
The braid being a nice additional safety feature.
On the other hand... just don't know.
It would be interesting to see just how much voltage it takes to pop
one of those cables.
--- On Tue, 6/24/08, MIKE BAILEY <m.bailey@xxxxxxxxxx> wrote:
From: MIKE BAILEY <m.bailey@xxxxxxxxxx>
Subject: [TCML] Where to mount the HV Transformer? Under the coil or
otherwise ?
To: tesla@xxxxxxxxxx
Date: Tuesday, June 24, 2008, 4:42 PM
I have my transformers mounted in my control cabinet and run
coax cable out to my RSG mounted under the coil , seems to
work good no problems so far. I would not connect the
braided part of the coax to rf ground , if there are any
weak areas in the insulation between the center conductor
and the braid or any microscopic holes it will eventually
fail and you will have a short to ground and the cable
could catch fire. I had a situation where I think there was
a break in the center conductor and arcing occured which led
to the white cable i was using turning black and started
smoking . what I do is just strip the outer layer of
plastic and expose the braid and connect it all together
with the center conductor and leave lots of space between
the 2 cables running out to the coil.
Mike
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