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Re: [TowerTalk] Rotator Loop Suggestions

Subject: Re: [TowerTalk] Rotator Loop Suggestions
From: K8RI on TT <>
Date: Tue, 29 Mar 2011 21:17:32 -0400
List-post: <">>
On 3/29/2011 8:12 PM, Robert Harmon wrote:
> Roger,
> I have some LMR 600 ultra flex that I will need to do a turning loop 
> arrangemet with.
> I am wondering if it is possible to do a 3 or 4 turn coil that is in a spiral 
> configuration
> around the mast, then there would be little abrasion  Just thinking.........

   I had the 400UF as you describe laying on the flat top plate of the 
45G for about 5 or 6 years (give or take). It actually had braid showing 
in one spot and many flat spots.  OTOH it had a number of cracks (up to 
an inch long) along the length apparently from exposure to the 
elements.  I had two pieces that looked good so I was making flexible 
station jumpers out of them.   I had already made several jumpers before 
I found a section where the braid was corroded  for several feet 
apparently from moisture.  I never did find where it got in.   This was 
pretty much in the middle of a 28' section that was good on both ends.

  Possibly had the top plate been painted so it was smooth the jacket 
would not have abraded like it did, but that still would not have 
stopped the weathering.

In my opinion, the UF cables NEED a cover over the jacket to protect 
them/it, particularly in rotator loops but that would reduce the 
flexibility.  Even several layers of tape *might* work.  Yes, I know how 
much the 600 UF costs as I have 2, 200 foot coils of unused LMR-600 UF 
left...some where. It has the same rubber like jacket as the lMR-400 
UF.  I have one run of the 600 UF  in the conduit between the tower and 
den where it's out of the elements.  I'll likely use the rest of it for 
additional runs in the conduit. I'd use it to the shop as well, but I 
already have multiple runs of regular LMR-600 in that conduit.

Had I removed the pigtails *before* I purchased the LMR-600UF I would 
never have purchased another batch of the UF.  It's a great low loss and 
very flexible coax, but it does not stand up well to UV light or 
mechanical abrasion.  It also seems a waste to put N-type connectors on 
the large cable, but most UHF connectors for it cost a small fortune.


Roger (K8RI)


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