From my work in the food industry (if memory serves), critter invasion is
prevented with 0.64mm square nylon netting. This is common in the
dress-making industry. (I think it can also be found as a stainless steel
gauze). This can be glued over a breather (drip) hole in the base.
David
G3UNA
----- Original Message -----
From: "Edward R Cole" <kl...@acsalaska.net>
To: <Elecraft@mailman.qth.net>
Sent: Wednesday, January 20, 2016 8:29 AM
Subject: Re: [Elecraft] Remoting KAT500 to base of antenna
Fred,
Your high desert climate will probably produce less condensation than my
sub-arctic/maritime environ. What I do for enclosures is to not seal them
airtight but provide good drain openings which air can exchange. Of
course the shelter is made to repel direct rain/snow.
I suspected that my TR relays were "freezing up" at lower temps making the
action delayed so I used some big aluminum Dale resistor strapped onto
the relays to add direct heat by conduction. I happen to have 28v
equipment so used 28v thru the resistors to produce heat within their
wattage rating (used 40w resistors at both relays). Of course this also
provided some heating of the ambient air of the enclosure which helped
keep moisture from forming even in 90% humidity of the fall. It rains
8-days with one day off from August to October when temps finally drop
below freezing and rain becomes snow. You don't have anything near that.
One thing I have noticed about drain holes in some equipment is they are
too small to allow water to drop free due to surface tension and in my
environ that results in the weep holes freezing tight. I drill them out
to 1/4 inch. Of course if you are prone to insect/archnid invasion that
is problematic.
PS: I lived five years in the high Mojave Desert so know all about
"critters of the desert" (never stick your hand into a confined space
before kicking it to see what crawls out or "rattles"!
73, Ed - KL7UW
------------------------------------------
3. Reno/Sparks is a high desert [4,500'] directly adjacent to the
Carson Range and Sierra Nevada [really big mountains]. Winter temps go
down into single digits, it does snow/rain. Should I do anything to
prevent condensation in the weatherproof box [light bulb, drain hole,
???].
73,
Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com
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