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

[Roger (K8RI) on TT]

On 11/21/2014 10:40 AM, Hans Hammarquist via TowerTalk wrote:

Mine is similar, yet different.
The cables go through bulkhead connectors in a NEMA  box mounted on the 
plate for the house and similar foe the shop.  In the shop the coax 
continues on through large EMT conduit onto a 10 X 10 X  4" NEMA 
box,there is a matching NEMA box inside the4 shop.  The conduit through 
the wall is filled with expandable foam after the coax was pulled in.  
The face plate on the inside has two rows of bulkhead connectors.
   http://www.rogerhalstead.com/ham_files/boat12.htm shows the bulkhead 
connectors above the rigs as well as a second run of EMT  up and to the 
W end of the shop.

There have been major changes in the station since this photo was taken.

73

Roger (K8RI)

> 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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-- 

73

Roger (K8RI)