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Date: Thu, 29 Dec 2016 19:21:24 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <159377c5fb0-275f-1de09@webprd-m63.mail.aol.com> <Pine.LNX.4.64.1612281416010.20461@plato.ucs.mun.ca> <586427B8.9060907@posteo.de> <01e101d261bd$b804a0f0$280de2d0$@comcast.net>
In-Reply-To: <01e101d261bd$b804a0f0$280de2d0$@comcast.net>
Subject: Re: VLF: New coil for 8270 Hz
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Hi Jim,

What is the link for that information? Share it with us.
Sounds like the perfect solution but i have my doubts with such perfect 
and easy solutions.

73, Stefan

Am 29.12.2016 11:24, schrieb hvanesce@comcast.net:
> Stefan,
>
> If you ever become interested in encapsulating an HV coil, I can send
> details for a straightforward process for low-cost/lightweight encapsulation
> that gives 10-year life in harsh outdoor environments with 10kV per inch
> across the problematic smooth surfaces. The dielectric is 450V/mil but the
> issue for lightweight long HV life in harsh outdoors is smooth interfaces
> between dissimilar materials, and this straightforward low cost process
> solves the problem. No special equipment needed. Decades of good field
> history with this process, no issues.
>
> 73,
>
> Jim AA5BW
>
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC
> Sent: Wednesday, December 28, 2016 4:00 PM
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: VLF: New coil for 8270 Hz
>
>
>
> Am 28.12.2016 19:00, schrieb jcraig@mun.ca:
>    
>> PS Stefan's coil is very compact.  0,4 mm wire?  Hope it can take the kV!
>>      
> Hi Joe,
>
> Yes, 0.4mm wire. The voltage is not the problem for the wire. But the tube
> is out of PVC and the length of the winding is about 0.3m. So it will be
> about 1kV/cm which could be problematic if the inner side of the tube
> becomes wet, inhomogeneous wet. This could cause strong local E field
> strength which leads to arcing on the surface. Arcing on the surface makes
> the surface conductive, a self accelerating process that can be repaired.
> This is the high risk of this construction! It has its advantages and
> disadvantages. It will handle 700 mA RF current, at least now in winter :-)
> But i should take care to keep it as dry as possible.
> We will see what happens.
>
> 73, Stefan
>
>
>