[TowerTalk] Weatherproof Sealant

[Julio Peralta]

Keith this may sound crazy but in some of the mast mounted preamps for V-Uhf
I've used over the years I found they were set up to allow water to drain
out the bottom of the box. It seems if the box is too sealed condensation
will still cause water to accumulate it the box and it has to have some way
to get out. By having some kind of vent the moisture in the air can vent
back to the outside.

Julio, W4HY

----- Original Message ----- 
From: "Keith Dutson" <kjdutson at earthlink.net>
To: <towertalk at contesting.com>
Sent: Tuesday, January 11, 2005 10:17 AM
Subject: [TowerTalk] Weatherproof Sealant


> I need to weatherproof a relay box.  Under test conditions it accumulated
an
> inch of water in the bottom over a six month period.  What is a specific
> brand of silicone sealant recommended?  I understand the kind with vinegar
> smell (acetic acid) will corrode electronics components in a sealed
> environment.  Also, is there a need to insert a desiccant in the box?
>
> The box is NEMA industrial type, made of plastic with neoprene o-ring seal
> on lid.  However, there are many holes drilled for stainless hardware used
> to mount the relay and connect wires to the exterior.  The relay itself is
> the open contact variety with self-cleaning contacts (hot switch 20 watts
> RF), and supposedly impervious to damp conditions.
>
> Thanks for any advice.
>
> Keith NM5G
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
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