At my old QTH, I used bulkhead connectors through a piece of 1/2² wood cut
to the size of my window well window. From there I used 2 sheets of
aluminum on either side of the wood and attached them together with SS
bolts. I grounded the whole thing using 2² copper strap to a couple of
ground rods outside. I used this feed-through for 6yrs and never had any
condensation. (I also sealed around the wood/aluminum panel with caulk).
73,
Jim N9WW
James Chaggaris
President
PowerOne Corp./PowerOne Environmental
2325 Dean St. Suite 200
St. Charles, IL 60175
Phn: 630.443.6500
Cell: 630.669.2241
Fax: 630.44366505
Website: www.pwrone.com <http://www.pwrone.com/>
On 11/21/14, 9:40 AM, "Hans Hammarquist via TowerTalk"
<towertalk@contesting.com> wrote:
>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@verizon.net>
>To: Tower and HF antenna construction topics. <towertalk@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@thepoint.net>
>To: "Hans Hammarquist" <hanslg@aol.com>; "Hans Hammarquist via TowerTalk"
><towertalk@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@contesting.com>:
>>
>>> Well, mine isn't. :(
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Ron Young <youngron@verizon.net>
>>> To: Hans Hammarquist <hanslg@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@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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>>
>>
>>
>> _______________________________________________
>>
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