I should have also added that I will never have to worry about a gob of
rope (70' of it) that becomes excess and just sits on the ground when
the "antenna wire" is hoisted up in the air. If I wasn't so lazy I would
make a pair of hooks etc like you have but this way I kill 2 birds with
1 stone (I think).
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/28/2019 11:06 AM, Gedas wrote:
I am hoping that I will never have to worry about the "loose end" of
my rope ever getting loose and coming off the top pulley requiring me
to tilt over my tower to re-thread the rope thru the pulley.
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/28/2019 1:21 AM, Robert Harmon wrote:
Gedas,
I have been following this discussion with interest. I have a
similar arrangement on my tower. I have a 3 foot pipe extending out
from the top section with a pulley on the end.
A rope goes through the pulley and is attached to the center of an 80
meter inverted V. Like you I can raise and lower the antenna with
the rope. The difference is
I dont have another pulley at the bottom and use a loop arrangement
to raise and lower the antenna. I have two cleats vertically
mounted on a tower leg a little over 3
feet apart and after hoisting the antenna up I wind the rope around
the two cleats. It takes approximately 10 wraps. What is the
advantage of using a loop arrangement
between two pulleys ?
Bob
K6UJ
On Nov 27, 2019, at 8:21 PM, Gedas <w8bya@mchsi.com> wrote:
I was wondering if anyone was going to ask that :-)
In the past what I have been doing is making a temporary loop (you
know the kind that if you pull on the ends with nothing inside the
loop, the loop will disappear).....well anyway once the double
Bowline knot is hoisted up to the top of the tower and wire antenna
attached I create a temporary loop at the bottom and slip it over a
smooth curved 3/8" steel hook I have fastened to one of the tower
legs. It's not super easy to make because the line is fairly tight
but not so tight that I cannot make one. When it's time to lower the
antenna I simply pull the loop off that steel hook, pull the knot
apart and lower the antenna like a flag.
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/27/2019 10:23 PM, Howard wrote:
Hi,
I'm sorry I don't have any additional knot information than what
has already been provided, however, I have a question. After you
pull the loop for your dipole to the top pulley, how do you intend
to hold the rope in that position?
Howard, WA9YBW
On 11/27/2019 3:50 PM, Gedas wrote:
Hi Wes and TU. I am not sure I am positive what you mean by only a
load on the upper side of the knot.
I am going to have two pulleys, one at the top of the tower and
one at the bottom. I am going to have a single long rope threaded
around both pulleys and I am going to use a fisherman's knot or
similar to tie the two together nice and tight. Not going to be
much tension in the rope at this point, maybe 10 pounds just to
keep both sides of the line nice and tight with no slop.
Now, I was hoping for a single knot that not only joined the two
ends of the rope together but that also left me with an open loop
so I could easily slip in something like a temporary chain link
etc and then attach one end of a dipole etc to that link.
This way from the ground I would be able to hoist up or down that
end of the dipole as I pleased. Now, when the end of the dipole
gets attached to the other end of that temporary chain link etc
and the dipole is up in the air stretched tight there may be 30-40
pounds of tension pulling on that line. Since the two pulleys are
fixed that tension from the dipole will get translated to my ropes
going up and down the tower between the pulleys.
I have been doing this type of arrangement for 20 years but only
with a pulley at the top of the tower. Up until now I just had the
long single rope looped around a round aluminum cross member of my
free standing tower.
There was some friction with the rope looping around the 3/8" dia
round & smooth diagonal but I never had a failure. This season I
installed a meaty pipe across the tower at about the 5' level and
attached a pulley at each end (I am going to have several ropes
going up and down so I can support and mess with more then 1
antenna).
I hope that paints a more clear picture. So far I have had a lot
of great ideas and the only issue is me understanding their words
and making my fingers tie the knots the way I'm supposed to hi-hi.
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/27/2019 4:25 PM, Wes wrote:
I'm with the other Wes on this one. If I understand correctly you
only have a load on the upper side of the knot. I would join the
ends with any old knot and tie a alpine butterfly loop on the
upper side of the knot:
https://www.animatedknots.com/alpine-butterfly-loop-knot or one I
find easier to tie, a bowline on a bight:
https://www.animatedknots.com/bowline-on-a-bight-knot
Wes N7WS
On 11/27/2019 2:06 PM, Wes Attaway (N5WA) wrote:
Gedas:
You have received a lot of good suggestions. Here is one more,
and it is
pretty simple. You are apparently not going to be risking
anyone's life.
You are going to hold up one end of a dipole and there may be
30-40-pounds
of tension..
I would just join the two ends of the Dacron rope with a simple
square knot
and with 6-inches or so of each rope sticking out from the
knot. Then tie
the two ends into a square knot. Tape the ends to the rope if
you want to.
With constant tension this arrangement will never come loose. I
have done
this many times over many years with ropes into trees and on
towers, etc.
Constant tension on the rope will keep the knots nice and tight.
-------------------
Wes Attaway (N5WA)
(318) 393-3289 - Shreveport, LA
Computer/Cellphone Forensics
AttawayForensics.com
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