I think Bury-Flex is supposed to be a 9913F clone, or maybe 9914F? but I
haven't compared the specs closely. When I was deciding on flexible cable for
rotors and my tubular crank-up, I got a few lengths of the commonly used models
to compare flexibility. The one that really surprised me was LMR-400UF, which
was really stiff compared with RG-213 and Bury-Flex. Also, critters seemed to
love the LMR-400UF jacket and destroyed many runs I had laying on the ground in
the woods. But they've never touched the Bury-Flex that replaced it. YMMV,
depending on your local critters.
73, Dick WC1M
-----Original Message-----
From: StellarCAT <rxdesign@ssvecnet.com>
Sent: Wednesday, March 27, 2019 12:34 PM
To: Dick Green WC1M <wc1m73@gmail.com>; 'Tim Duffy' <k3lr@k3lr.com>; 'tower'
<towertalk@contesting.com>
Subject: Re: [TowerTalk] how to do coax on ring rotor?
Thanks Dick - seems that is the way to go - up the boom truss, loop down and
then back up again. I hope to test this out in a couple/few weeks.
I'll be looking for the 'right' coax as well. I had been thinking of 9913F7
which has a stranded core.
Gary
-----Original Message-----
From: Dick Green WC1M
Sent: Wednesday, March 27, 2019 12:23 PM
To: 'Tim Duffy' ; 'StellarCAT' ; 'tower'
Subject: RE: [TowerTalk] how to do coax on ring rotor?
I have coax and SteppIR control cables, taped together, that loop above the
boom because all three of my rings sit about a foot above a guy bracket. The
guys and brackets could interfere with a loop below the rings.
There are some photos of the tower on my website, www.wc1m.com, which shows why
below the rings won't work for my setup, but the photos can no longer be
enlarged and it's hard to see the loops (and not all that easy to see them in
the hi-res versions.) The site is hosted by the ISP I ditched years ago and I
haven't done any maintenance since. Need to move the whole thing to a new host.
One of the huge number of very time-consuming low-priority projects on my list.
From memory (still lots of snow on the ground here), the coax is attached to
the tower about 5 feet above the ring, drops straight down and loops back up to
the top of the boom truss support, which is a 3-foot piece of galvanized pipe
offset from the ring's boom cradle using a custom mounting plate made from roof
truss plates. The key is that the boom and pipe are mounted away from the tower
face, leaving enough room for a loop. From the top of the truss support, the
coax goes straight down the pipe, to which it's taped, then snakes out along
the boom to the feed point. Pretty sure I used Bury-Flex for the coax, which is
quite flexible, but I might have used
RG-213 because the runs from the stack match are only about 35 feet or so.
73, Dick WC1M
-----Original Message-----
From: Tim Duffy <k3lr@k3lr.com>
Sent: Sunday, March 24, 2019 3:26 PM
To: 'StellarCAT' <rxdesign@ssvecnet.com>; 'tower' <towertalk@contesting.com>
Subject: Re: [TowerTalk] how to do coax on ring rotor?
HI Gary
Have the loop below the boom works very well here. You have to have a safe
climber in place for the installation and it check out 360 degrees while
someone in the shack (linked by radios) operates the control box. Take measures
to insure the coax can never get caught by the guy attachment hardware. The key
to this is coming off the boom about 3 feet away from the tower face.
73
Tim K3LR
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
StellarCAT
Sent: Sunday, March 24, 2019 1:56 PM
To: Tim Duffy; 'tower'
Subject: Re: [TowerTalk] how to do coax on ring rotor?
Thanks Tim ... as I wrote David direct - it was a "DUH!" moment when I read
his note - which was to use the truss support upright. I have been focusing too
much on the actual antenna and the coax along the boom .... thinking loops
around the tower and drapes etc.... I hadn't even considered the truss support.
That should be pretty straight forward.
I do have a guy right below, within 3', so I'm reluctant to let it hang down
directly from the boom .... although it looks like that is what you do Tim.
Gary
K9RX
-----Original Message-----
From: Tim Duffy
Sent: Sunday, March 24, 2019 12:27 PM
To: 'StellarCAT' ; 'tower'
Subject: RE: [TowerTalk] how to do coax on ring rotor?
Hello Gary:
You can go to my website and see lots of photos of coax with ring rotors.
There are 23 ring rotors here - so if you have questions after looking at
the photos and videos - please email me and I will help
http://www.k3lr.com look at contest photos and videos
73
Tim K3LR
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
StellarCAT
Sent: Sunday, March 24, 2019 12:00 PM
To: tower
Subject: [TowerTalk] how to do coax on ring rotor?
I’ve got two TIC ring rotors that are going up – hopefully this spring ...
they’ll have 2 7 element 10’s on them ... (yeah, I know, 10M’s).... and I’m
trying to figure out the best way to handle the coax coming off of the
antennas. Both going up from the ring as well as going down. I need up
because one of the rings will be mounted 4’ above a guy point so going down
isn’t likely to be a solution.
Anyone done this already and gone through the trials and tribulations of
getting it right?
You’re welcome to write direct to my ARRL email address or post here...
thanks – Gary, K9RX
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