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Re: [TowerTalk] re; STUF Weather Proofing compound...

Subject: Re: [TowerTalk] re; STUF Weather Proofing compound...
From: K8RI on TT <>
Date: Thu, 06 Oct 2011 12:47:08 -0400
List-post: <">>
On 10/6/2011 10:55 AM, wrote:
> In a message dated 10/5/2011 2:10:29 P.M. Pacific Daylight Time,
> writes:
>>   Steve, the theory for using an inert filler is that the space  inside
> the connector is filled, leaving no room for water. Valid? Who  knows?!
As I mentioned, it also has hazards associated with it.  If multiple 
connectors, or both ends of a run are flooded the pressure differential 
between the inside of the coax and outside can become considerably more 
with changes in temperature. I think most of us have seen the 
demonstration where a metal can is heated, capped, and then cooled with 
atmospheric pressure crushing the metal can. If the cable is installed 
on a nice sunshiny day with flooded connectors a similar pressure 
differential can exist.  If it is installed on a cold day, then the 
pressure inside can get quite high on a hot day. Both conditions are 
likely to blow out the flooding compound.  The hazard with the first 
condition is the cable ingesting humid air, or actual moisture.

It's normally recommended that only the end at the antenna be flooded.  
I've done it that way and had no problems, but I prefer to just do a 
good job of weather sealing the connectors.  Most ham antennas need the 
antenna connector sealed as well as they are a great place for water to 
get in.  I think it's probably more important up here in the North where 
we have greater temperature cycles from day to night and week to week, 
or season to season.  OTOH the high desert has some pretty big 
temperature excursions from day to night.


Roger (K8RI)
>      Well, yes - that's the theory. And I'm sure it  works. But it's not the
> only way to waterproof a connection - only the  messiest.
> Cheers,
> Steve    K7LXC
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