Re: Two layer primary

["Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

I've given  some thought to how one would wind such a coil... Spacers would
be the only way. You could probably use something like 1/4" polyethylene
tubing (between the windings in a layer) and 1/4" polyethylene strips
(between the layers).  You would DEFINITELY need some flanges to wind
between.  You might be able to come up with a way to use 1/4" poly tubing
for all the spacing.  Since you're doing the tuning off axis, you don't need
access to the turns of the coil, except perhaps as taps every 3-4 turns.
-----Original Message-----
From: Tesla list <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Thursday, September 14, 2000 11:27 AM
Subject: RE: Two layer primary


>Original poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com>
>
>That's a fine idea on paper, but making a neat flat spiral out of 1/4"
>tubing is enough of a challenge.  Winding two turns per layer sounds like
an
>invitation for frustration!!  I think I'm leaning towards gluing lexan
>spacer blocks to both sides of the insulating sheet of lexan.  I agree with
>the tuning inductor.
>
>Regards, Gary Lau
>Waltham, MA USA
>
>>Original poster: "Jim Lux" <jimlux-at-jpl.nasa.gov>
>>
>>why not wind it as a multi layer coil with 2 turns on each layer..   Here
>is
>>a sideways view of the primary with turn numbers.
>>
>>I'd seriously consider using an "off axis" inductor for fine tuning too.
>>since the scheme below is going to make tapping a bit of a challenge
>>
>>
>>10 9
>>8 7
>>5 6
>>4 3
>>1 2
>>center of coil
>>1 2
>>4 3
>>5 6
>>8 7
>>10 9
>
>
>
>