[TowerTalk] Fwd: Fwd: Bulkhead feed-through.

[Hans Hammarquist via TowerTalk]

No Ron, it's worse. I have a square opening in the wall of my shack that is covered with a metal plate. There are holes in the plate that hold the bulkhead feed-troughs. 


My idea was to have easy access to the various feeders that goes up the tower. I plug in the coax from the trx whatever antenna I need for the moment. All the connectors are open to the air in the shack. I thought it was an excellent idea but realize now that it might not have been that excellent after all.


As the plate has no insulation it will get cold in the winter and I will have condensation on it AND the connectors. If (I am sure it will) the condensation goes through the connectors I will also have water on the outside with following corrosion. :( As the connectors are sealed, the water will have no way to get out.


Maybe I should remove the seals on the outside to reduce the risk of corrosion.


Hans - N2JFS



-----Original Message-----
From: Ron W8RJL <youngron at verizon.net>
To: Tower and HF antenna construction topics. <towertalk at contesting.com>
Sent: Thu, Nov 20, 2014 11:41 pm
Subject: Re: [TowerTalk] Fwd:  Bulkhead feed-through.


Hans apparently has a metal plate against the outside of his house/shack 
with feed thru connectors (they come in lengths to go thru the wall) and 
apparently thinks humidity can get thru the feed thru to the connector 
outside screwed onto the outside end of the feed thru. If I have understood 
his set up, I don't see where any moist air from inside the house/shack can 
get to the PL-259 outside because there will be a coax screwed onto the 
inside end of the feed thru.

My comment is that most/many put the bulkhead plate a few inches away from 
the outside wall (enough room to be able to screw on a PL-259) and just run 
coax and a wide piece of braid thru the wall. Yes, the bulkhead it tied to 
or part of the ground rod so the bulkhead plate or box (rain protection for 
lightning arrestors etc) is in fact the SPG (single point ground).

I don't think Hans has a problem especially if coax connectors are sealed 
with a good quality tape and/or lined heat shrink.

Ron W8RJL
----- Original Message ----- 
From: <n8de at thepoint.net>
To: "Hans Hammarquist" <hanslg at aol.com>; "Hans Hammarquist via TowerTalk" 
<towertalk at contesting.com>
Sent: Thursday, November 20, 2014 6:18 PM
Subject: Re: [TowerTalk] Fwd: Bulkhead feed-through.


>I don't understand Ron's post at all.
>
> My bulkhead is my SPG and is mounted in a vent about 1 foot from the 
> ground rod outside the house.
>
> In reference to the original question:
> IF the bulkhead connectors are secure and there is a DRIP LOOP on the 
> INSIDE of them, there should be NO problem with water inside the 
> coax/bulkhead connector.
>
> 73
> Don
> N8DE
>
>
>
> Quoting Hans Hammarquist via TowerTalk <towertalk at contesting.com>:
>
>> Well, mine isn't. :(
>>
>>
>>
>>
>> -----Original Message-----
>> From: Ron Young <youngron at verizon.net>
>> To: Hans Hammarquist <hanslg at aol.com>
>> Sent: Thu, Nov 20, 2014 5:42 pm
>> Subject: Re: [TowerTalk] Bulkhead feed-through.
>>
>>
>> Usually the bulkhead is on stand-offs so the plate is off the   outside 
>> wall. Only
>> coax goes thru the wall. There should be no vapor going thru the coax so 
>> no
>> problem.
>> Ron W8RJL
>>
>> Sent from my iPhone
>>
>>> On Nov 20, 2014, at 5:34 PM, Hans Hammarquist via TowerTalk
>> <towertalk at contesting.com> wrote:
>>>
>>> I have a grounded, metal plate that carries all my bulkhead connectors 
>>> from
>> the outside to the inside. No big deal except: I have wrapped the 
>> outside of the
>> connectors with water tight tape.
>>>
>>>
>>> Consider that the temperature is lower outside than inside (Vermont) I 
>>> am
>> afraid that I will have water buildup on the connectors on the   outside 
>> as vapor
>> easily can get through from the inside.
>>>
>>>
>>> Comments! Have anyone have had a problem with this before? Do I have to 
>>> get
>> guarantied water tight bulk, feed-through connectors?
>>>
>>>
>>> 73 de,
>>>
>>>
>>> Hans
>>>
>>>
>>> N2JFS
>>> _______________________________________________
>>>
>>>
>>>
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>>
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>
>
>
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