[AMRadio] Drying out HV transformers / Chokes


Joe A. Taylor n4nas1 at hotmail.com
Sun Sep 18 14:09:29 EDT 2005


I'm sure may be too simplistic to work but.....
why not put the xformer in the trunk of a
car and leave it there, outside in the sun, for
a week or month.   Here in KY that works for
most everything.  I've dried apples this way ;-)

Joe  N4NAS

>>Joe <<   n4nas1 at hotmail.com






>From: "G. TAYLOR" <wb8bem at yahoo.com>
>Reply-To: Discussion of AM Radio <amradio at mailman.qth.net>
>To: w8hrq at lemleys.org,Discussion of AM Radio <amradio at mailman.qth.net>
>Subject: Re: [AMRadio] Drying out HV transformers / Chokes
>Date: Sun, 18 Sep 2005 07:22:03 -0700 (PDT)
>
>
>Don,
>
>I suspect they may not be very wet if they haven't been in contact with
>water or condensation. I bought a CVM-5 that had been in an outside
>shed that was hit by a tornado. It was rusted, there was a roof over it
>but hardly any walls left. Any driven rain would have gotten on it, and
>it was in high humidity.(Alabama) But since they are so rare, I bought
>it anyway.
>
>Upon checking, it had about 1-2 megs to ground. If I'd needed in then,
>I'd probably tried it at that level. One meg. per 1,000 volts used to
>be the rule. But I put it in my basement Ham Shack in Alabama and it
>set there in the dry for about a year. I kept checking it and it
>steadly was going up. When I was ready to use it, for my HB 810's x
>810's it read infinity! No heat, not anything but a dry heated and
>cooled basement!
>
>They should be checked with a megger though, It applies a DC voltage
>usually 500, or 1,000 volts. Most electricians, or any motor shop has
>these.
>
>GL
>Gary WB8BEM/8
>
>
>
>
>
>
> >
> > 	Ok, I know this has been covered here before, but is there a
> > consensus on how to get the moisture out of HV plate transformers and
> > chokes, so they won't arc on me.  And before everyone jumps in with
> > the
> > quick
> > "just put it in an oven on xxx degrees for yy hours", I am working
> > with
> > the
> > iron from a Broadcast transmitter, specifically, the Gates BC-1G so
> > these
> > things are 100, 150 lbs each, and my XYL would REALLY not like it if
> > I
> > tried
> > to put them in her fancy oven.  They have been sitting in an
> > un-conditioned
> > but dry hanger/garage for several years, so I am certain they have
> > soaked up
> > a good deal of moisture over that time.
> >
> > Thanks for any suggestions,
> >
> > 	Don - W8HRQ
> >
> >
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