See here: http://w9iix.com/ii00008.htm
Larry
K9LMM
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of
towertalk-request@contesting.com
Sent: Friday, October 03, 2008 4:44 AM
To: towertalk@contesting.com
Subject: TowerTalk Digest, Vol 70, Issue 4
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Today's Topics:
1. Ceramic insulator strength - the Splatt Test (Rod Elliott)
2. Force12 EF240X loading line measurement (Larry)
3. Re: Ceramic insulator strength - the Splatt Test
(Cqtestk4xs@aol.com)
4. Re: Ceramic insulator strength - the Splatt Test (Alan NV8A)
5. Rohn 25G and 45G fold over information (Ronald D Lowrance)
6. Rohn 25G fold-over option (Ronald D Lowrance)
7. MT3000A Ant Tuner Calibration (Larry & Karen)
8. Re: Rohn 25G and 45G fold over information (Robert Morris)
9. Why are gin poles so expensive? (Drax Felton)
10. Re: Why are gin poles so expensive? (David Robbins K1TTT)
11. Re: Why are gin poles so expensive? (John)
12. Gin Poles (Gary Jones)
----------------------------------------------------------------------
Message: 1
Date: Thu, 02 Oct 2008 17:22:56 +0000
From: Rod Elliott <wultabat@sympatico.ca>
Subject: [TowerTalk] Ceramic insulator strength - the Splatt Test
To: towertalk@contesting.com
Message-ID: <48E50370.2050605@sympatico.ca>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
OK you guys... which of you would go bungee jumping with an egg insulator in
series with the cord? ;-)
73
Rod VE3UW
> -----Original Message-----
> Oh come on, Eric. You haven't seen a real wave until you've buried the
>bow of an aircraft carrier and experienced solid green water hitting the
>bridge windows 95 feet above the waterline ;-) > >73, >Dan KB5MY/6
> > Drax,
> >
> > I have used those ceramic insulators to isolate the backstay on a > >
sailboat for an antenna. Believe me when I say, there is a heck of a lot >
> more then 1K lb of pressure on the backstay when running before a storm >
> and I bury half the boat as we slide of the top of a 15 to 20 foot wave >
> and it slams into the next wave. I use to worry about the hull tangs > >
letting go, never the insulator.
> >
> > For those in the know, I am talking shorter fetch of fresh water waves
> > on Lake Ontario, not those wimpy long waves found on the ocean. <grin>
> > > > Eric - VE3GSI > > > > > > > > -----Original Message----- > >
From: Drax Felton > > Subject: [TowerTalk] How strong are ceramic
insulators?
> >
> >
> >
> > Just how strong are ceramic egg insulators when used on tower guy
wires?
> >
> > It doesn't seem right that these could stand 1000 lbs.+ of pull.
> >
> >
> >
> > What type should I use on my tower?
> >
------------------------------
Message: 2
Date: Thu, 2 Oct 2008 13:25:48 -0400
From: "Larry" <lknain@nc.rr.com>
Subject: [TowerTalk] Force12 EF240X loading line measurement
To: <towertalk@contesting.com>
Message-ID: <03238A7D975A4086A7F10CD0483285D9@LEKVENTURE>
Content-Type: text/plain; charset="iso-8859-1"
I have misplaced my instructions for my EF240X. I had to rebuild it after
one element fell off and getting down and unbalanced antenna was a bit tough
on the other element. I am looking for the starting measurements for the
shorting line for the loading lines for both the DE and reflector elements.
Thanks
Larry W6NWS
------------------------------
Message: 3
Date: Thu, 2 Oct 2008 14:33:38 EDT
From: Cqtestk4xs@aol.com
Subject: Re: [TowerTalk] Ceramic insulator strength - the Splatt Test
To: towertalk@contesting.com
Message-ID: <c3e.347b1d45.36166e02@aol.com>
Content-Type: text/plain; charset="US-ASCII"
In a message dated 10/2/2008 5:23:33 PM Greenwich Standard Time,
wultabat@sympatico.ca writes:
OK you guys... which of you would go bungee jumping with an egg insulator
in series with the cord? ;-)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Insulators are designed for static loads....not for sudden shock loads like
a bungee jump.
By the way, I wouldn't jump with a five inch thick bungee cord in series
with anything.
Bill KH7XS/K4XS
**************Looking for simple solutions to your real-life financial
challenges? Check out WalletPop for the latest news and information, tips
and
calculators. (http://www.walletpop.com/?NCID=emlcntuswall00000001)
------------------------------
Message: 4
Date: Thu, 02 Oct 2008 14:56:13 -0400
From: Alan NV8A <nv8a@att.net>
Subject: Re: [TowerTalk] Ceramic insulator strength - the Splatt Test
To: towertalk reflector <towertalk@contesting.com>
Cc: Rod Elliott <wultabat@sympatico.ca>
Message-ID: <48E5194D.8080901@att.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
When egg insulators are installed correctly (see the picture to which
somebody already posted a link), a loop at the end of each
wire/rope/cable passes through a loop at the end of the other. So even
if the insulator fails, the two sections of wire/rope/cable are still
interconnected.
73
Alan NV8A
On 10/02/08 01:22 pm Rod Elliott wrote:
> OK you guys... which of you would go bungee jumping with an egg
> insulator in series with the cord? ;-)
------------------------------
Message: 5
Date: Thu, 2 Oct 2008 16:00:55 -0400
From: Ronald D Lowrance <rlowranc@us.ibm.com>
Subject: [TowerTalk] Rohn 25G and 45G fold over information
To: towertalk@contesting.com
Message-ID:
<OFAF7B0175.8703A368-ON872574D6.006DBF69-852574D6.006DF2F2@us.ibm.com>
Content-Type: text/plain; charset="US-ASCII"
I am looking for the technical and installation information on the
discontinued Rohn 25G and 45G fold-over option. If you can assist me
please contact me at k4sx@centurytel.net
Thank you,
Ron
K4SX
------------------------------
Message: 6
Date: Thu, 2 Oct 2008 16:23:04 -0400
From: Ronald D Lowrance <rlowranc@us.ibm.com>
Subject: [TowerTalk] Rohn 25G fold-over option
To: towertalk@contesting.com
Message-ID:
<OF75731CE6.E7FF4ED3-ON872574D6.006FA643-852574D6.006FF9E7@us.ibm.com>
Content-Type: text/plain; charset="US-ASCII"
I would like to purchase the Rohn 25G fold-over option. (This is the one
that was discontinued by Rohn). I live near St.Louis. If you have this
option for sale please send me an email at k4sx@centurytel.net with the
information, price, and pictures if possible.
Thank you,
Ron
K4SX
------------------------------
Message: 7
Date: Thu, 2 Oct 2008 16:25:02 -0500
From: "Larry & Karen" <k0is@iowatelecom.net>
Subject: [TowerTalk] MT3000A Ant Tuner Calibration
To: <towertalk@contesting.com>
Message-ID: <0A82CE3780014663A6270C1238D80DD2@Downstairs>
Content-Type: text/plain; charset="iso-8859-1"
I've got a Dentron MT3000A tuner and the reflected power circuit needs
calibration. The manual...worthless on this subject. If anyone has
information I would appreciate it.
73,
Larry K0IS
------------------------------
Message: 8
Date: Thu, 02 Oct 2008 18:10:03 -0400
From: Robert Morris <robrk@nidhog.net>
Subject: Re: [TowerTalk] Rohn 25G and 45G fold over information
To: Ronald D Lowrance <rlowranc@us.ibm.com>
Cc: towertalk@contesting.com
Message-ID: <48E546BB.3010405@nidhog.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Tried to send you a 1 meg PDF....
Here's what I got back.
The original message was received at Thu, 2 Oct 2008 18:18:14 -0400 (EDT)
from 209.195.188.121.nauticom.net [209.195.188.121]
----- The following addresses had permanent fatal errors -----
<k4sx@centurytel.net>
(reason: 550 5.7.1 <k4sx@centurytel.net>... H:MXB [66.207.132.5]
Connection refused due to abuse. Please contact your E-mail provider.)
Ronald D Lowrance wrote:
> I am looking for the technical and installation
>
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
------------------------------
Message: 9
Date: Fri, 3 Oct 2008 01:41:53 -0400
From: "Drax Felton" <draxfelton@gmail.com>
Subject: [TowerTalk] Why are gin poles so expensive?
To: <towertalk@contesting.com>
Message-ID: <006001c9251a$bdb84f80$3928ee80$@com>
Content-Type: text/plain; charset="us-ascii"
Why are gin poles for assembling for example, Rohn 25, so expensive?
The Rohn one is over a thousand dollars and even the kits are $250 and don't
include the tube.
Isn't it just a pulley, rope, pipe, and some clamps?
Do I need to know anything important if I fashion my own from hardware store
materials?
-Drax
KB3X
------------------------------
Message: 10
Date: Fri, 03 Oct 2008 11:47:51 +0000
From: "David Robbins K1TTT" <k1ttt@arrl.net>
Subject: Re: [TowerTalk] Why are gin poles so expensive?
To: <towertalk@contesting.com>
Message-ID: <1DB6C49694F74FD5B1CDE8B93E307611@k1tttibm>
Content-Type: text/plain; charset=us-ascii
The one special thing to know is: your life depends on the strength and
reliability of every piece of hardware that goes into it. Yes, some people
have gotten away with making them out of hardware store parts including
2x4's and gradeless u-bolts, but you would never catch me up a tower using
anything like that.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Drax Felton
> Sent: Friday, October 03, 2008 05:42
> To: towertalk@contesting.com
> Subject: [TowerTalk] Why are gin poles so expensive?
>
>
>
> Why are gin poles for assembling for example, Rohn 25, so expensive?
>
> The Rohn one is over a thousand dollars and even the kits are $250 and
> don't
> include the tube.
>
>
>
> Isn't it just a pulley, rope, pipe, and some clamps?
>
> Do I need to know anything important if I fashion my own from hardware
> store
> materials?
>
>
>
> -Drax
>
> KB3X
>
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
------------------------------
Message: 11
Date: Fri, 3 Oct 2008 05:21:12 -0500
From: "John" <jmltinc@aol.com>
Subject: Re: [TowerTalk] Why are gin poles so expensive?
To: <towertalk@contesting.com>
Message-ID: <F5EE1DEC6491494792490F53B3FB0E33@john1>
Content-Type: text/plain; charset="iso-8859-1"
Try and make one - you'll understand. It needs to have fasteners that can
easilly release the fixture, yet secure as to not kill someone. It has to
have a hinge. It requires tubing and a locking mechanism to hold the pole
itself. And all parts must be welded. Did I mention liability?
-John, N9RF
----- Original Message -----
From: Drax Felton
To: towertalk@contesting.com
Sent: Friday, October 03, 2008 12:41 AM
Subject: [TowerTalk] Why are gin poles so expensive?
Why are gin poles for assembling for example, Rohn 25, so expensive?
The Rohn one is over a thousand dollars and even the kits are $250 and
don't
include the tube.
Isn't it just a pulley, rope, pipe, and some clamps?
Do I need to know anything important if I fashion my own from hardware
store
materials?
-Drax
KB3X
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------------------------------
Message: 12
Date: Fri, 3 Oct 2008 07:43:58 -0500
From: "Gary Jones" <garyejones@cmaaccess.com>
Subject: [TowerTalk] Gin Poles
To: <TowerTalk@contesting.com>
Message-ID: <068f01c92555$b4795c30$1d6c1490$@com>
Content-Type: text/plain; charset="windows-1250"
The truth of the matter is that there is $200.00 worth of metal in the Rohn
gin pole. However, if you do it right (in building it yourself), it is going
to cost a lot more than that for the professional machining and fabrication
work to get one made locally right. When I first began tower work 30 years
ago, I built a gin pole from a heavy wall piece of aluminum pipe, u-bolts,
and a heavy farm pulley simply hooked over the top of the pipe. My first
version did not stand off the leg of the tower because it was u-bolted to
the tower leg. The pulley did not stand off the top of the pole either since
it was simply hooked over the top. What I discovered was that it was very
difficult to attach the gin pole quickly onto the tower and it was a maybe
15 minute job to get it attached, get the bolts torque down and ready to go,
and then I discovered that because there was no clearance between pole and
tower leg, that it was nearly impossible to get the new tower leg to slide
over the top of the lower tower section (the gin pole was clamped to). It
could be done, but it was time consuming. And it was impossible to get any
screws through the legs to bolt down the new section. Then it would take 20
minutes to disconnect the gin pole, hang it off the side of the tower, place
the tower leg bolts, and move it up to the next level. Finally, I ran into a
situation where there was a lot of side torque on my home brew gin pole, and
I bent the heavy duty EMT off to about a 45 degree angle before I got the
situation under control. The next week, I purchased a commercial gin pole. I
considered it a ?life investment: (I would use it for the rest of my life).
The single biggest factor with my commercial gin pole is that I can slap it
into position in 30? and it holds itself while I torque down the wing nut
bolts and it is ready to use in less than a minutes (and can be done with
one hand)?. When you are up 120 feet, that means a lot.
The Rohn gin pole is very expensive, but worth it. Ten ? Ten Corporation (I
can?t remember their logo X-II? or something) makes a kit that is good if
you can find the right quality of tubing to put between the clamp and the
pully assembly.
Gary W5FI
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------------------------------
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