For decades I have used Belden 8267 (RG213) which I considered to be tough
as nails. Unfortunately the jacket on my newer runs of 8267 has quickly
lightened in color which has me concerned. I have a few antenna upgrades
planned this year so I posted my questions to see what coax options are
available for rotator loops. Thank you for sharing your choice and more
importantly your reasoning for using it.
73,
John KK9A - W4AAA
-----Original Message-----
From: Tim Duffy [mailto:k3lr@k3lr.com]
Sent: Tuesday, May 19, 2020 2:15 PM
To: john@kk9a.com; towertalk@contesting.com
Subject: RE: [TowerTalk] Anyone have experience using Davis bury-flex as
their rotor loop
Hello John:
I use the DX Engineering RG-213 mil-spec for all of my coax loops.
https://www.dxengineering.com/parts/dxe-213u
The reason to use RG-213 is the solid polyethylene dielectric which is very
important in flexible situations. It is not only rotation - it is the
constant movement caused by wind.
I am not a fan of using foam dielectric cables (such as LMR400, bury flex or
DXE400MAX) for rotation loops. The center conductor will migrate over time
and that can cause problems. I have seen others try this - only to replace
with RG-213 once the foam dielectric cable failed.
73
Tim K3LR
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
john@kk9a.com
Sent: Tuesday, May 19, 2020 8:19 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Anyone have experience using Davis bury-flex as
their rotor loop
This is confusing because the subject does not match the contents of
the post. When people reply that this coax has worked well for them
for years I wonder which coax they are referring to - Bury-FLEX or
LMR-400? I purchased LMR-400 to make temporary antenna cables and I
found it to be quite stiff, at least compared to the Belden RG-213
that I have used for years. So I sold it and bought LMR-400UF which is
much more flexible but unfortunately not good for long term outdoor
exposure.
If cost is not a factor, what is the best rotator loop coax for HR?
What do the big stations like K3LR, K1LZ, W3LPL, etc use?
John KK9A
Pete Raymond N4KW wrote:
I plan to run LMR 400 up to the top of the tower, and the lowest loss
coax for the remaining antennas on the mast. It's advertised as being
flexible and capable of being used as a rotor loop. Have you used it
this way?
73, Pete, N4KW
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