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Re: Primary question
Original poster: "Mike Novak by way of Terry Fritz <twftesla-at-uswest-dot-net>" <acmnovak-at-email.msn-dot-com>
Sorry you didn't get any responses on your last post, so I'll be happy to
put in my two cents...
Copper strap primaries are very close to ideal when it comes to TCs. Yes,
corona can be a problem at the edges, if cut improperly, but for the most
part, it's really nothing to worry about. In order to get the inductance up
to a useable level, the primary must have a large inner diameter. It is
better to use a few turns with a large diameter rather than a bunch of turns
close to the secondary, because overcoupling will become a serious problem.
One consideration which must be kept in mind is the physical size of the
conductor itself. You should be sure and use a reasonably thick strap (18
guage or better IMHO).
All in all, I think copper strap primaries are the way to go, if you can
afford it. I would suggest using some type of phenolic as supports just in
case you do see *any* corona. The best place to get the materials (both
strap and phenolic) is McMaster-Carr.
Good luck, Chris!
> Original poster: "Chris Brick by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> I didn't get any responses from my last post on this topic, most likely
> to my wording.
> Here goes:
> I am building a new coil and would like to use a copper strap primary as
> opposed to copper tubing. Are there any major concerns I should be aware
> Corona issues from sharp strap edges?
> Decreased field due to more compact design?
> Changes in coupling due to tighter field?
> If anyone has done any testing in this area, your experiences would be
> Also, what type of tap connections you used?