Rain should just blow off. Ice or dirt should be more concern. I actually had
to remove dead creatures from the gaps on our DA every so often.
73,
Bill
AI4WM
--- On Mon, 10/6/08, Jim Miller <JimMiller@STL-OnLine.Net> wrote:
> From: Jim Miller <JimMiller@STL-OnLine.Net>
> Subject: Re: [TowerTalk] spark gap/ insulated tower
> To: "TOWERTALK Reflector" <TOWERTALK@contesting.com>
> Date: Monday, October 6, 2008, 3:22 PM
> Rain, interesting thought. Can they be mounted horizontally
> so the raindrop
> will not tend to close the gap? OR the contacts separately
> mounted up at 45
> degrees with the contact points of EACH pointed up so the
> rain will run away
> from the spark gap? Can they be shielded? With a plastic
> soda bottle or a
> plastic kit box?
>
> I haven't seen these things but have been considering
> one and the pictures
> seem to be from a museum or belong in a dungeon or
> something.
>
> 73, Jim
>
> ----- Original Message -----
> From: "jim Jarvis"
> <jimjarvis@optonline.net>
> To: <towertalk@contesting.com>
> Sent: Monday, October 06, 2008 7:40 AM
> Subject: Re: [TowerTalk] spark gap/ insulated tower
>
>
> >
> > Todd wrote:
> >
> > I recently erected an 80' base insulated Rohn 25G
> tower. It is
> > guyed with
> > philystran cable. I have been told that I should
> install a spark gap
> > at the
> > base insulators. If this is the case, what should the
> gap be for such a
> > spark gap? I currently have 2 brass straps 1.5"
> wide X 1/4" thick
> > from the
> > top and bottom of the insulators. The gap is
> 3/16" wide. Any advice is
> > greatly appreciated. Todd, WA7U
> > -0-
> >
> > Todd, it somewhat depends on the shape of your gap
> materials.
> > Broadcast towers have balls, the spacing of which can
> be varied,
> > depending
> > on power levels involved.
> >
> > 3/16" may be just fine for you. You don't
> want it arcing over at
> > full power, even when
> > it's raining. But you want it spaced as closely
> as possible, beyond
> > that.
> > The arc-over situation will vary, depending on whether
> you have
> > pointed metal
> > to pointed metal, or to a flat plate, or other shape.
> >
> > So, no simple answer will be correct.
> >
> > N2EA
> >
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
> _______________________________________________
>
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