I believe the "life" of UF is about 5 years if your in Florida
or Arizona with its higher UV.... otherwise TM says:
Weatherability: LMR-400-UF cables are designed
for outdoor exposure and have a life expectancy in excess
of 10 years.
Weatherability: LMR-400 cables designed for
outdoor exposure incorporate the best materials for UV
resistance and have life expectancy in excess of 20 years.
All the specs are here in pdf
----- Original Message -----
From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
To: "Michael Ryan" <firstname.lastname@example.org>
Cc: "'Rob Atkinson'" <email@example.com>; <firstname.lastname@example.org>
Sent: Tuesday, March 25, 2008 4:42 PM
Subject: Re: [TowerTalk] LMR and CNT
> Michael Ryan wrote:
>> Interesting comments on the cables. I was under the impression that
>> UF ( ultra flex ) was plenty flexible to use up the tower including the
>> rotator loop area. It looks and feels heavy but does indeed appear to be
> My only complaint about LMR-400 UF is the jacket which appears to be a
> rubber like material with poor resistance to abrasion and has not held
> up well. I had to replace it once when the pins in the mast sheared and
> let the antennas windmill. This pulled the cable tight over the edge of
> the tower top plate and stripped the jacket right off. It came of like
> a rubber tube. Of course that may have ruined any cable from either
> kinking (the 400 didn't kink), or abrading a strip off the jacket for
> other cables. The cable is plenty flexible, and I was able to use the
> regular connectors on it. Unfortunately after 6 years it's time to be
>> much more flexible than 1/2 heliax which one would never use for a
>> loop. Has anyone has negative results with the 600Uf in such an
>> as I have suggested I wonder? - Mike
> The only reason I've chosen to go with the Davis "Bury Flex" is its
> reputation for resistance to abrasion. IOW the stuff is rugged.
> Otherwise I'd prefer the LMR 600 UF, but that is over twice the price of
> the Davis cable and I'm a bit cautious after the LMR-400UF. There are
> pigtails for 144, 440, and 50 MHz. Probably a second 144 as I want to
> add a horizontally polarized yagi. The Tribander has a short pigtail
> and doesn't gain anything worth while using the larger coax so that
> would certainly remain the Davis Bury Flex. There is also the
> possibility of a Wi max antenna going "up top."
>> -----Original Message-----
>> From: email@example.com
>> [mailto:firstname.lastname@example.org] On Behalf Of Roger (K8RI)
>> Sent: Tuesday, March 25, 2008 4:27 PM
>> To: Rob Atkinson
>> Cc: email@example.com
>> Subject: Re: [TowerTalk] LMR and CNT
>> Rob Atkinson wrote:
>>> My advice--if you are considering going with LMR or CNT and the cost of
>>> run of one of them, you may as well spend a bit more and go with 1/2
>>> heliax LDF4-50 and get it over with. There's always this debate about
>>> on HF the reduced loss isn't enough to make it worth it but that's not
>>> point--the stuff is almost indestructible with its jacket and solid
>>> it would probably jam a wood chipper and you'd be done with feedline
>> We all have different viewpoints. I replaced LDF4-50 with LR-600. For
>> my use (laying on the ground from the shop to the tower 6-pack and then
>> up the tower) I found the Andrew to be more fragile, (easily dented,
>> easily kinked, and has a much larger minimum bend radius than even
>> LMR-600). So once I finish all runs up the tower will be LMR-600 and the
>> LMR-400 currently on the ground will be replaced with 600 in underground
>> conduit. The LMR-600 on the ground will also go into the conduit.
>> I use CNT240 and LMR-400 runs from the antenna switches to the slopers.
>> As I use all crimp connectors I never noticed any problem, but both
>> cables are listed as tined copper braid over Al foil shields from the
>> suppliers. Neither CNT240 or the LMR cables are what you would call
>> flexible when compared to the RG8X family.
> LMR or CNT 240 can be a royal pain in the backside to strip without
> scoreing the braid, so you use a properly adjusted stripper for that one
> or a lot of care. Scoring the jacket and then breaking it works very
> well. The pigtails at the top of the tower are currently LMR-400 ultraflex
> which has not proven to be all that durable. The pigtails (with integral
> rotator loops) will be
> replaced with Davis bury flex.
>>> forever. If you don't care about that go with 213. I have never
>>> understood why anyone bothers with the times microwave coax. All that
>> It's good, it has a short bend radius and it's relatively inexpensive
>> and I find it to be very robust. The only cables that have given me
>> problems have been the Belden and the ultraflex versions of LMR-400.
>> I've had 3 runs of LMR 400 laying on the ground between the shop and
>> tower since last fall. They've been walked on, run over by the yard
>> tractor, tripped over and show no damage. Normally they'd not be on the
>> ground but some of this work started after the ground got kinda hard. IE
>> frozen last fall.
>> Roger (K8RI)
>>> expense for a feedline that is not all that robust.
>>> rob / k5uj
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