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Re: [TowerTalk] LMR 600 Water-proof Feed Thrus (+ H20 proof'g) DAVIS RF

To: jimlux <>
Subject: Re: [TowerTalk] LMR 600 Water-proof Feed Thrus (+ H20 proof'g) DAVIS RF Response
From: Stephen Davis <>
Date: Sat, 31 Jul 2010 13:50:23 -0400
List-post: <">>
Hi Jim,  I stand corrected....didn't interpret correctly what you were 

>From what I hear, the DX Engineering enclosure is a nice one.  We don't handle 
>such a product but we can save buyers some $$ on any products in the 
>Polyphaser line.   In addition to in-coax line protectors, we also have had 
>fellow hams buying service entrance protectors, as even hits on the utility 
>line ground, even when a mile away from the shack, can be an issue coming into 
>the house/shack on that utility line.  These protectors are expensive and any 
>of the PolyPhaser parts can be seen on their website,  
>  (some NEAT lightning pics there also).
If there is anything at all that I can help with, feel free to contact don't need to have a possible buying need to talk with me.    Email 
me or call my direct line, below, as I am not at our 800 #, I am at a branch 
handling mostly commercial matters nowadays (not as much fun as ham radio 
matters !!  HI )     
73,   Steve ,  K1PEK, 

DAVIS RF Co.,  Div. of Orion Wire Co., Inc.

Wire, Cable, RF Connectors and wire aerial parts.  

LMR, Heliax, Eupen

Commercial / Military

Custom Cable Design

tel:  978-369-1738     Fax:  978-369-3484

On Jul 31, 2010, at 11:00 AM, jimlux wrote:

> Stephen Davis wrote:
>> Hi Guys,
>> Some observations: There was a reference to "Silicone Caulk" for
>> sealing the connector threads.  I think he meant Silicone grease.
>> Silicone grease is better for a number of reasons, and  although some
>> folks use Silicone caulk on the outside of connectors, and to seal
>> wire connections from coax to wire antenna feed points, I recommend
>> against it as there can be adverse chemical reactions with copper
>> wire and also silicone caulk will seem to adhere to PVC and PE (many
>> LMR's) outer jacket but in very short time the seal will break down,
>> letting water in.
> I was thinking silicone caulk to seal the the housing of the transient 
> suppressor to the box, not for the threads.. The idea being that you drill a 
> hole in the box and push the threaded part of the connector thru the hole, 
> with the housing of the suppressor snug up against the inside wall of the box.
> Cheaper and smaller than a bulkhead feedthrough and another cable inside the 
> box from feedthrough to suppressor.
> Of course, one could probably just use a piece of wire (not coax) to connect 
> the center pin of the feedthrough to the center pin of the connector on the 
> suppressor.  The shield of the feedthrough is solidly connected to the box, 
> as is the housing of the suppressor, and the few inches of wire probably 
> wouldn't make much difference impedance wise, at least for HF.
> You'd use whatever usual scheme you want for sealing the actual connector.


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