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Re: outdoor coils

Original poster: "Brian" <ka1bbg@xxxxxxxxxxxxx>

Hi, rather than take a chance i would keep the secondary inside for the
winter. cul brian f.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, November 17, 2005 10:34 AM
Subject: Re: outdoor coils


> Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>
>
> Lets hear more about coils in cold conditions. I live in Wisconsin. It's
> going to get down in the teens tonight. This'll be the first winter my
coils
> see. Will my coils survive? One is PVC coated with glyptal, then wound and
> polyurethaned. Other is acrylic wound and coated the same. Third isn't
> wound, but fiberglass coated in glyptal.
>
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Thursday, November 17, 2005 12:16 AM
> Subject: Re: outdoor coils
>
>
>  > Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>  >
>  > Hi Chris, Robert,
>  >
>  > Interesting! I'm in CA these days but started coiling in Minnesota
>  > which is cold cold cold. I didn't use PVC but sonotube at that point
>  > which I did coat inside and out with a thinned-out urethane (to
>  > absorb into the sonotube). Due to the temp swings, I decided to use
>  > Marine Spar Varnish for the outer coating. This particular varnish
>  > remains flexible (hard to the touch). I've never had any problems
>  > with cracking, shrinking, expanding, etc.. Just wanted to mention
>  > that as it's available at all hardware stores. Even though I'm in
>  > sunny CA, I still use the same varnish. It's been a nice varnish and
>  > goes on thick.
>  >
>  > Take care,
>  > Bart
>  >
>  > Tesla list wrote:
>  >
>  > >Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
>  > >
>  > >Chris: I am at 7200 ft alt.so temprature extreams are a serious
> problem.PVC
>  > >has a large expansion ratio so it is very important that your coating
be
>  > >well bonded to your coil form or the secondary coil will slide off the
> coil
>  > >form in cold weather. I beleave I have finaly solved this problem by
> rough
>  > >sanding my coil form and pre coating the form before winding my coil
> while
>  > >the coating is still slightly soft so the wire will not slide off. I
have
>  > >had my coil drop 2 inches down the coil form in the cold.
>  > >    Robert   H
>  >
>  >
>
>
>