[TCML] Secondary Damage (Large Coil)
cn at q.com
Wed Apr 18 11:25:06 MDT 2012
The only advantage to this fix is that it doesn't leave a spot with
larger diameter or with only one layer of insulation, and that it's
invisible from any distance.
My form is made of cardboard 12" dia. and 30" long. It has seven of
these fixes and none of them are misbehaving. Fortunately I now have a
PVC form and have retired the old (21 years) cardboard coil. Well done,
good and faithful servant.
PS--I also wind my coils bifilar with monofilament nylon fishing line of
the same dia. to increase interturn insulation and to lower distributed
capacitance. It also makes this fix easier. It's surprisingly easy to
> I would not suggest this fix. Sure the electric field is all vertical
> or longitudinal as you say, but that doesnt mean it wont corona!!!
> Your "fix" sounds like a great way to start carbon tracking inside the
> coil form.
> On Sat, Apr 14, 2012 at 10:04 AM, Carl Noggle<cn at q.com> wrote:
>> Oe way to make a smooth coupling is to drill a small hole through the form,
>> strip the wire ends, and feed them through the hole. Then twist them
>> together inside the form and solder them. Then rewind the rest of the coil.
>> Putting epoxy around the splice couldn't hurt.
>> The sharp ends will not go into corona inside the form since the field
>> inside is only longitudinal. I have (unfortunately) made many of these
>> splices and they have all worked well.
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