[TowerTalk] heat shrink weathering

Thu Sep 29 15:37:00 PDT 2011

What is MMM stuff?
marlon

----- Original Message ----- 
From: "K8RI on TT" <k8ri-on-towertalk at tm.net>
To: <towertalk at contesting.com>
Sent: Monday, September 26, 2011 10:22 AM
Subject: Re: [TowerTalk] heat shrink weathering

> On 9/26/2011 11:52 AM, Marlon K. Schafer (509-982-2181) wrote:
>> When I was in the service we used quite a bit of this:
>> http://raychem.te.com/CableProtection.asp
>>
>> Pretty cool stuff.  It had something in the jacket that showed when you 
>> were
>> getting it hot enough etc.
>>
>> Lately I've used some from a local electrical supply house.  It worked 
>> well,
>> had lots of glue inside etc.
>>
>> What I found in my area is that when it gets cold the glue gets hard and
>> doesn't stay sealed to the cable.  This resulted in water penetration.
>
> Try the flooded MMM stuff.  It has never come loose here and we get a
> number of days and nights below zero in the winter.
>
> 73
>
> Roger (K8RI)
>>
>> For the high frequencies that I work with this was a major problem.  Any
>> little bit of water at 2400mhz is a disaster.  I've seen a LOT of sub 
>> 1ghz
>> connections with no weather proofing at all work just fine.
>>
>> The heat shrink is great stuff where you can use it.
>>
>> laters,
>> marlon
>>
>>
>> ----- Original Message -----
>> From: "Joseph or Ruth Patrick"<hdmc38 at bellsouth.net>
>> To: "Grant Saviers"<grants2 at pacbell.net>
>> Cc:<towertalk at contesting.com>
>> Sent: Monday, September 12, 2011 6:40 AM
>> Subject: Re: [TowerTalk] heat shrink weathering
>>
>>
>> Good Morning Grant
>>
>> I can't give you an exact figure as to the life of the heat shrink 
>> tubing.
>> If
>> you can find out who the manufacturer is they should be able to help you
>> out. I
>> have used heat shrink on connectors that were hard to seal properly. To
>> close to
>> something, not enough clearance etc. I have had some in use for 5 years 
>> now.
>> Recently I had to replace an insulator on my mobile set up. I cut off the
>> heat
>> shrink and the PL-259 was bright and shiny as when I sealed it. I can't 
>> give
>> you
>> a name because the piece I have left is not marked. I did use the type 
>> with
>> adhesive inside. Also look for a 3 to1 shrink ratio. If you don't have a
>> heat
>> gun I would suggest you purchase a cheap one unless you plan to use it a
>> lot. I
>> picked one up on E-bay for$20.00 + shipping. Yeah it was really cheap but 
>> it
>> worked fine and still does. Just go slow and don't get it to hot. I also 
>> use
>> a
>> silicone based paste named "STUFF" inside the connection. Had good luck 
>> with
>> that also. The adhesive type is hard to remove. Maybe some SteppIR owners
>> can
>> help with that. Good Luck let us know how you make out.
>> 73 DE K4XZ Joe Patrick
>> God Made Man
>> Sam Colt Made Them Equal
>>
>>
>>
>>
>> ________________________________
>> From: Grant Saviers<grants2 at pacbell.net>
>> To: towertalk at contesting.com
>> Sent: Sun, September 11, 2011 7:59:10 PM
>> Subject: [TowerTalk] heat shrink weathering
>>
>> I'm building a new SteppIR beam and they have changed from tape wrapping
>> the fiberglass element joints to an adhesive lined heat shrink "CANUSA
>> CFTV".
>>
>> This approach seems better than two layer's of Scotch 33 plus a layer
>> self amalgamating silicone tape which is what is in the instruction book.
>>
>> My question is how long does the heat shrink/adhesive last in the
>> weather, sun, etc? Apparently CFTV has been used for some time in the
>> cellular business and a fellow towertalkian might have observed the
>> performance for 5 to 10 years.
>>
>> I have plenty of silicone tape and plain old #33 so could wrap each heat
>> shrink piece if that is warranted.
>>
>> 73,
>>
>> Grant KZ1W
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