At the risk of repeating myself, I do not use any mesh covering vent
holes on enclosures that are above ground level (at least a few
feet). I've not had any intrusion of "critters" and we have wasp
nests which seem to prefer underside of roof eves. I'm guessing the
wildlife have plenty of alternative "homes" here at the edge of
wilderness to bother with RF exposure! ;-)
I used ordinary window screen material in the bottom 4-inch diameter
vent holes of my PS enclosure at my dish as the fans draw air into
the box from a plenum area below and that is definitely spider and
bug haven. Exhaust vent is similarly screened.
http://www.kl7uw.com/DishPS_11.jpg
http://www.kl7uw.com/DishPS_09.jpg
http://www.kl7uw.com/DishPS_02.jpg
http://www.kl7uw.com/DishPS_03.jpg
In my amplifier boxes fans move air thru vents and heated air from
high power equipment keeps condensation free in the interior if I run
equipment often enough. I do use stainless steel hardware which
inhibits corrosion.
I have two Hoffman style boxes at the dish and three on the 2m-eme
tower Hazer. Except for the 2m-eme preamp/relay box all have
amplifiers providing air heating.
http://www.kl7uw.com/1296PA_enclosure_1.jpg
http://www.kl7uw.com/2m-eme%20lowered.jpg
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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