Also known as 3M.
73/K5GW
In a message dated 9/29/2011 6:46:06 P.M. Central Daylight Time,
k8ri-on-towertalk@tm.net writes:
On 9/29/2011 6:37 PM, Marlon K. Schafer (509-982-2181) wrote:
> What is MMM stuff?
It's a flooded heat shrink tube that comes various sizes made by MMM
73
Roger (K8RI)
> marlon
>
> ----- Original Message -----
> From: "K8RI on TT"<k8ri-on-towertalk@tm.net>
> To:<towertalk@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@bellsouth.net>
>>> To: "Grant Saviers"<grants2@pacbell.net>
>>> Cc:<towertalk@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@pacbell.net>
>>> To: towertalk@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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>>
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