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Re: Copper Banding?

Original poster: Karl Lindheimer <karl@xxxxxxxxxxxxxxx>

Hi Finn, Kurt, all

Those were great photos you posted of your ribbon style primaries.
They seem to have several advantages over the usual wire/tube style
primaries.  I am impressed by the quality and presentation of your
work.  It never fails to amaze me over how many different types of
coils that can be constructed, as well as the individuality they
posess.

Thanks for sharing your projects with all of us.

Karl

------------------------------------------------------------------------ ------------
On Feb 26, 2005, at 2:45 PM, Tesla list wrote:

Hi Karl, Tyler, all

a slightly more "amateur"-way construction of a ribbon type primary
than Finn's, is the one I made for a small twin-TC.
My strip primary (ribbon spiral) is made of copper ribbon of 0.55mm
thickness only (20mm wide). The distance between turns is only 6mm
(~1/4"). I also don't meet any problems with corona/arcovers, when
feeding 33nF primary cap with up to 1300W from a 15/60 NST. A pic may
be seen at:

http://home.tiscalinet.ch/m.schraner/FlatPrim_1555.jpg

The view is from the bottom side (...when later buildt into the TC). In
front of the coil are 6 of the really flat taps, developped for this
primary, mounted on a piece of ribbon for demonstration.

Remember, if calculating the inductance of those primaries, the
inductance is _less_ than one made of wire/tubing conductors, and
calculated by the usual wheeler-formula. Metal ribbon type spiral
primary inductance calculation is available, in form of a zipped Excel,
at:

http://home.datacomm.ch/k.schraner/FlatRibbonCoil.zip  (~57kB)

Best regards,
              Kurt Schraner

------------------------------------------------------------------------ ------------
Original poster: Finn Hammer <f-h@xxxx>

Karl, all

Phosfor bronze primary`s are great, I have used it in a couple of coils.
Best pictures i have are from my Ambassador coil, where you can see
another, but also more complicated, way to get the strip suspended in
space around the secondary.

http://home5.inet.tele.dk/f-hammer/tesla/ambassador/primary/primary.htm

Cheers, Finn Hammer