[TowerTalk] Sealing Coax Connector

[Orcena Lyle]

I get good long-lasting waterproof seals with Roger's first two steps: 
self-fusing tape (I use #70), covered with #33 (called "Black Gold" by the 
3M people because it made billions of $$ for 3M (it's been around since 
1947)).  One layer of each, wrapped downhill, 50% overlap. I was taught this 
method by 3M retirees (I live in the Twin Cities).

73 de Orcy WØQT


----- Original Message ----- 
From: "Roger D Johnson" <n1rj at roadrunner.com>
Cc: "TowerTalk" <towertalk at contesting.com>
Sent: Thursday, October 14, 2010 1:16 PM
Subject: Re: [TowerTalk] Sealing Coax Connector


> bob finger wrote:
>> Two layers of 88t wrapped tight, then a layer of linerless rubber pulled
>> out until it is  grey wrapped tight then another layer of 88T.  Be sure
>> to tape so water runs away from the wraps, not into them.  73 bob de w9ge
>>
>>
> Here is the method we used in the Coast Guard for shipboard connectors:
>
> A better method for environmental sealing to protect against the weather
> (as practiced by the U.S. Navy) is as follows:
> A layer of ScotchTm 3M type 79 self-fusing tape wound with a 50% overlap
> an stretched while being applied.
> A Layer of ScotchTm 3M type 33+ Vinyl tape wound with a 50% overlap an
> stretched while being applied, followed
> by a similar layer wound in the opposite direction. (also at a stretched
> - 50% overlap). 3) A sealant layer of Scotchkote
> Liquid Vinyl is applied overlap the layer of 33 tape. ScotchkoteTm has a
> MEK solvent which melts into the surface of the
> 33+ tape to form a continuous layer of vinyl material. This type of
> sealant procedure can be applied over any type of
> connector including heat-shrink boots to protect the  polyolefin
> material against UV rays), although in this latter case only
> the 33+ and Scotchkotem is needed to provide a protective an flexible 
> layer.
>
> 73, Roger
>
>
>
>
>
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