Tnx for the feedback. Yes, Bury-Flex (Tm of DAVIS RF Co.) has almost exactly
the same low loss at HF as 9913F7 (which has the same loss as LMR-400UF, up
thru 2.8 GHz, close thereafter). The only real difference Bury-Flex Tm vs.
9913F7 and LMR-400UF is that the flexibility of Bury Flex is slightly less than
the other two cables, but noticeably more flex than LMR-400 (the "standard"
version). Bury-Flex Tm also can be run through water, ponds, streams, and in
salt water (we have not tested it for depth applicability but we know of one
application in salt water at 11 ft. depth). Also, it is around 22% less
expensive than 9913F7, thus around 30% less expensive than LMR 400 UF (pricing
depends on where you purchase , of course, and many of our dealers sell all
three cables).... and Bury Flex Tm has a longer (long!) life in UV than the
other two cables, the LMR-400 UF being a relatively short life, as noted in my
original email below.
73, Steve, K1PEK
DAVIS RF Co., Div. of Orion Wire Co., Inc.
Wire, Cable, RF Connectors and wire aerial parts.
LMR, Heliax, Eupen
Commercial / Military
Custom Cable Design
tel: 978-369-1738 Fax: 978-369-3484
On Dec 22, 2010, at 1:35 PM, EZ wrote:
> Thanks for the info, Stephen. I have both 9913F7 and Buryflex in use and
> like both of them. I believe that they have similar losses at HF. I think
> the LMR400 stuff gets too much press!
> ----- Original Message -----
> From: "Stephen Davis" <sdavis@DavisRF.com>
> To: "Tower Talk" <email@example.com>
> Sent: Wednesday, December 22, 2010 11:20 AM
> Subject: [TowerTalk] Using Belden 9913F7 Vs. LMR-400UF : An
> Alternative.Input by DAVIS RF Co
>> Hello TT'rs,
>> There has fairly often been comments on TT ref. the down side of outdoor
> use of Times LMR-400 UF. The issue is short life. As a cable design
> engineer, I have an appreciation for this problem.
>> The Times catalog/spec sheet indicates a life of up to 10 years. The
> more realistic life range, in UV, IMHO and experience, is considerably less
> than 10 years. The reason for this is their use of TPE (Thermoplastic
> Elastomer) outer jacketing. It assists in good flexibility at a sacrifice to
> life due to UV degradation.
>> A not so well known, but excellent, alternative is Belden's 9913F7 (not
> to be confused with 9913, the often water in air (hollow) dielectric issue).
>> 9913F7 uses their formulated PVC "Belflex" Tm which is good for 2 - 2.5 or
> more times the life of 400 UF.
>> 9913F7's low loss is the same up to 2.8 GHz, and close above that. The
> flexibility is the same. The cost is about 8% less than 400 UF (BUT more
> like half the cost if you factor in how long 9913F7 will last).
>> This choice is almost a "no brainer".
>> I hope this is of some help to you. If any questions, feel free to
> contact me.
>> 73 and have some great Holidays,
>> Steve , K1PEK,
>> DAVIS RF Co., Div. of Orion Wire Co., Inc.
>> Wire, Cable, RF Connectors and wire aerial parts.
>> LMR, Heliax, Eupen
>> Commercial / Military
>> Custom Cable Design
>> tel: 978-369-1738 Fax: 978-369-3484
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