[Elecraft] Remoting KAT500 to base of antenna

[Lewis Phelps]

But might not this re-introduce the surface tension problem?

Lew N6LEW


> On Jan 20, 2016, at 10:18 AM, David Cutter <d.cutter at ntlworld.com> wrote:
> 
> 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" <kl7uw at acsalaska.net <mailto:kl7uw at acsalaska.net>>
> To: <Elecraft at mailman.qth.net <mailto:Elecraft at 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:
>>    dubususa at gmail.com
>> 
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Lew Phelps N6LEW
Pasadena, CA DM04wd
Elecraft K3-10 / KXV144 / XV432
Yaesu FT-7800 
Lew at N6LEW.US
www.n6lew.us

Generalized Law of Entropy: Sooner or later, everything that has been put together will fall apart.