Re: [IRCA] Metal matching transformer box

[Rick Kunath <k9ao@xxxxxxxxxxx>]

Patrick Martin wrote:

> I will have to use a bolt or plug in the hole and that should take care
> of any issues. The trickness of the box varies. The cover has two screws
> in it. It is just a conduit box that you would install a socket in a
> house, but I covered it with a couple tricknesses of foil and then taped
> it up well.

As long as you have metal-to-metal contact on the cover edges you'll be 
OK. Some of the cast boxes have a sort of cast slot that a tongue on the 
cover slides into, sort of a tongue-and-groove thing. These are really 
well shielded. The key for shielding is the inner and outer surface 
separation. So the foil would have to have a solid contact with the box 
or the coax connector to be fully effective. Likely if the cover 
contacts the box all around it's edges, you're fine.

> The holes will not have any wires running through them, just
> holes, but I will put some kind of plug in them to keep bugs out. I will
> just have to remove the plug and shake the water out. I guess the inside
> will be damp, but not much I can do about it. 

There is always electrical fungus-proofing varnish. That stuff works 
pretty well. You could spray that over the innards of the box, masking 
off the potentiometer.

I've used Krylon spray on clear acrylic coatings too in the past. Not 
lacquer, this stuff is a spray on acrylic plastic. It sprays like the 
clear lacquer, but it's an acrylic plastic. I had hardware outside for 
years and it looks new after being sprayed with this stuff.

Rick Kunath
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