[Towertalk] 20 Year-Old Tri-Ex LM-470D Telescoping Tower
W1GOR
W1GOR@Maine.RR.Com
Wed, 25 Dec 2002 13:06:59 -0500
I have an opportunity to buy a 20-year-old Tri-Ex LM-470D, a 70 foot
telescoping tower. The present owner replaced the cables about a year
ago... He did NOT use OEM cables; rather, he made the replacement cables
himself. From the information that I've read on this reflector, it sounds
like a disaster-in-the-making. If I decide to buy his tower, I'd also have
to buy a new set of OEM cables, a new base to be embedded in concrete, and
possible a new rotor plate if the present one does not fit my rotor.
There are several tower-people nearby that are able to give it a thorough
inspection. Assuming a tower in safe, servicable condition, and considering
the age of the tower and the additional hardware to be purchased, how much
might it be worth at this time?
Tnx, 73, and Happy Holidays...
Larry, W1GOR
----- Original Message -----
From: <towertalk-request@contesting.com>
To: <towertalk@contesting.com>
Sent: Wednesday, December 25, 2002 12:08 PM
Subject: Towertalk digest, Vol 1 #801 - 7 msgs
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> Today's Topics:
>
> 1. Re: Tower Search (Ward Silver)
> 2. Rohn 6 (Scott Millick)
> 3. Antenna installed... rotor question (Jason Hissong)
> 4. Re: Rohn 6 (mcduffie@actcom.net)
> 5. Re: Rohn 6 (Mike Brown)
> 6. Re: Rohn 6 (n4kg@juno.com)
> 7. Re: Antenna installed... rotor question (Mike Rhodes)
>
> --__--__--
>
> Message: 1
> Reply-To: "Ward Silver" <hwardsil@centurytel.net>
> From: "Ward Silver" <hwardsil@centurytel.net>
> To: "Towertalk Reflector" <towertalk@contesting.com>
> Date: Tue, 24 Dec 2002 20:23:26 -0800
> Subject: [Towertalk] Re: Tower Search
>
> >> Looking for what would be considered a "quiet" tower.
> >> The tower will have to be self supporting and either crank up or fold
> >>over.
> >> ........but just going 55 feet plus or minus a few feet with a planned
> >> 3 element Fluid Motion beam on top - Any tower suggestions?
> >> 73 Paul N0AH
> >
> >
> > Paul,
> >To meet the criteria for being either crank-up or fold over and self
> >supporting, as well as "quiet", I believe you are limited to the US Tower
> >telescopic mast type tower selection. Fold-overs all needed to be guyed
and
> >are no longer available new. Lattice crank-ups, as you know, are anything
> >but quiet. With the antenna load you indicate, The US Tower MA-550 series
> >appears to be just what you're looking for. Check out the
> >www.texastowers.com web site for more information.
> >Merry Christmas and Best Wishes in your relocation. 73, -=Rog-K9RB=-
>
> MA-550 tubular and similar towers are not really very quiet, either. The
> tubes will "clunk" in the wind, magnified if bracketed to the house, as
> well.. Definitely not as loud as lattice towers, but not as quiet as a
> guyed or self-supporting fixed-height tower. If quiet is the primary
> requirement, even a regular fixed-height will cause some creaks and clunks
> if bracketed to a house.
>
> 73, Ward N0AX
>
>
>
>
> --__--__--
>
> Message: 2
> Date: Tue, 24 Dec 2002 22:44:43 -0600
> To: towertalk@contesting.com
> From: Scott Millick <smillick@wamusa.com>
> Subject: [Towertalk] Rohn 6
>
> I had one in 1958 with a TA33 and then a TA36 It survived a ice storm at
> 39 feet I later put it up about 10 miles away for 6 and 2 and it was
> nicknamed old shaky. I have two sections that I used for a Oscar antenna
> before I moved. Heck for $300 Id sell u 7 sections of Rohn 25
>
>
> --__--__--
>
> Message: 3
> From: "Jason Hissong" <jhisson1@columbus.rr.com>
> To: <TOWERTALK@CONTESTING.COM>
> Date: Tue, 24 Dec 2002 23:49:12 -0500
> Subject: [Towertalk] Antenna installed... rotor question
>
> Hi guys,
>
> Finished installing the tower... however, I noticed something about my
> rotor. When I start at 0 degrees and then rotate it around 360 degrees it
> is not at the exact same place as before. It should be pointing North
> again, but it about 30 degrees off. Is this due to the mast not being
> aligned? I thought I had it aligned.
>
> Anyways.. updated pictures at
> http://www.qsl.net/n8xe/radio/tower_project.html
>
> Thanks, Merry Christmas, es 73!
>
> Jason Hissong
> N8XE
>
>
> --__--__--
>
> Message: 4
> From: mcduffie@actcom.net
> To: Scott Millick <smillick@wamusa.com>, towertalk@contesting.com
> Subject: Re: [Towertalk] Rohn 6
> Date: Tue, 24 Dec 2002 21:58:44 -0700
> Reply-To: ag0n@arrl.net
>
> On Tue, 24 Dec 2002 22:44:43 -0600, Scott Millick wrote:
>
> > I had one in 1958 with a TA33 and then a TA36 It survived a ice storm
at
> > 39 feet I later put it up about 10 miles away for 6 and 2 and it was
> > nicknamed old shaky. I have two sections that I used for a Oscar antenna
> > before I moved. Heck for $300 Id sell u 7 sections of Rohn 25
>
> Yep, I got 70 feet for $200. He's already called the deal off. Thanks
for
> the input guys and have a great Christmas.
>
> gm
>
> a g 0 n at a r r l dot n e t
> http colon slash slash mcduffie dot ws
> --
>
> --__--__--
>
> Message: 5
> Date: Wed, 25 Dec 2002 07:37:14 +0000 (GMT Standard Time)
> From: "Mike Brown" <k9mi@arrl.net>
> To: <smillick@wamusa.com>, <towertalk@contesting.com>
> Subject: Re: [Towertalk] Rohn 6
>
> You guys really have my curiosity up now. I may be using a Rohn 6. I have
> 40ft of it up, and it was given to me around 6 years ago for helping take=
> it
> down. It had some surface rust on it, and I was a bit concerned about it,
> but our local tower climber said to clean it up, and paint it, and it sho=
> uld
> be ok. He took it down, put it up, and has been up it quite a few times t=
> o
> change some things for me. The face of it is 11.5", which is close to Roh=
> n
> 25, and I did buy a used Rohn 25 rotor plate that fits it ok. It has a TH=
> 3
> on it, plus a Comet omni 10ft above that. I'll put the link to my web pag=
> e
> on here so if you want to take a look at it, I would appreciate it. Maybe=
> I
> should think about replacing it in the spring! Thanks...=0D
> =0D
> http://www.qsl.net/k9mi/antennas.html=0D
> =0D
> Mike - K9MI=0D
> =0D
> =0D
> =0D
> -------Original Message-------=0D
> =0D
> From: Scott Millick=0D
> Date: Wednesday, December 25, 2002 04:46:05=0D
> To: towertalk@contesting.com=0D
> Subject: [Towertalk] Rohn 6=0D
> =0D
> I had one in 1958 with a TA33 and then a TA36 It survived a ice storm at =
> =0D
> 39 feet I later put it up about 10 miles away for 6 and 2 and it was =0D
> nicknamed old shaky. I have two sections that I used for a Oscar antenna =
> =0D
> before I moved. Heck for $300 Id sell u 7 sections of Rohn 25=0D
> =0D
> _______________________________________________=0D
> AN Wireless Self Supporting Towers at discounted prices, =0D
> See http://www.mscomputer.com =0D
> =0D
> Wireless Weather Stations now $349.95. Call Toll Free, =0D
> 888-333-9041 for additional information.=0D
> _______________________________________________=0D
> Towertalk mailing list=0D
> Towertalk@contesting.com=0D
> http://lists.contesting.com/mailman/listinfo/towertalk=0D
> =2E=20
>
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> --__--__--
>
> Message: 6
> To: TOWERTALK@CONTESTING.COM, k9mi@arrl.net
> Date: Wed, 25 Dec 2002 09:23:50 -0600
> Subject: Re: [Towertalk] Rohn 6
> From: n4kg@juno.com
>
> One of the locals used to have a 4L20 on 90 ft of Rohn 6.
> It is a little on the 'light' side, but it was up for YEARS.
>
> As I recall, Rohn 6 has flat plates with rounded edges mounted
> vertically for steps and the legs are SMALLER in diameter than R25,
> maybe 1 inch o.d.?
>
> There were several manufacturers of TV tower that used
> 1.25 inch o.d. legs with same size tubing used as steps
> where the ends were flattened and welded to the legs.
>
> I have 3 such towers supporting 3 beams each at 55, 75,
> and 80 ft. The main 'weakness' of these towers is that they
> 'twist and flex' more easily than R20 or R25 due to the
> absense of any diagonal bracing. I guy those towers closer
> (every 20 or 25 ft) than R25 and use guy brackets with torque
> arms at the top and middle.
>
> Bottom Line: I would not worry about a small 3L tribander on
> 40 ft of either tower, assuming it is guyed well. I would probably
> use two sets of guys for such a tower.
>
> Tom N4KG
>
>
> On Wed, 25 Dec 2002 07:37:14 +0000 (GMT Standard Time) "Mike Brown"
> <k9mi@arrl.net> writes:
> > You guys really have my curiosity up now. I may be using a Rohn 6. I
> > have
> > 40ft of it up, and it was given to me around 6 years ago for helping
> > take it
> > down. It had some surface rust on it, and I was a bit concerned
> > about it,
> > but our local tower climber said to clean it up, and paint it, and
> > it should
> > be ok. He took it down, put it up, and has been up it quite a few
> > times to
> > change some things for me. The face of it is 11.5", which is close
> > to Rohn
> > 25, and I did buy a used Rohn 25 rotor plate that fits it ok. It has
> > a TH3
> > on it, plus a Comet omni 10ft above that. I'll put the link to my
> > web page
> > on here so if you want to take a look at it, I would appreciate it.
> > Maybe I
> > should think about replacing it in the spring! Thanks... > >
> http://www.qsl.net/k9mi/antennas.html > > Mike - K9MI > > > >
>
> ________________________________________________________________
> Sign Up for Juno Platinum Internet Access Today
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>
> --__--__--
>
> Message: 7
> From: "Mike Rhodes" <weightdn@adelphia.net>
> To: "Jason Hissong" <jhisson1@columbus.rr.com>, <TOWERTALK@contesting.com>
> Subject: Re: [Towertalk] Antenna installed... rotor question
> Date: Wed, 25 Dec 2002 10:03:07 -0500
>
> Have you calibrated the rotor control box? Exact procedure depends on
which
> rotor you have.
>
> Mike / W8DN
>
> ----- Original Message -----
> From: "Jason Hissong" <jhisson1@columbus.rr.com>
> To: <TOWERTALK@contesting.com>
> Sent: Tuesday, December 24, 2002 11:49 PM
> Subject: [Towertalk] Antenna installed... rotor question
>
>
> > Hi guys,
> >
> > Finished installing the tower... however, I noticed something about my
> > rotor. When I start at 0 degrees and then rotate it around 360 degrees
it
> > is not at the exact same place as before. It should be pointing North
> > again, but it about 30 degrees off. Is this due to the mast not being
> > aligned? I thought I had it aligned.
> >
> > Anyways.. updated pictures at
> > http://www.qsl.net/n8xe/radio/tower_project.html
> >
> > Thanks, Merry Christmas, es 73!
> >
> > Jason Hissong
> > N8XE
> >
> > _______________________________________________
> > AN Wireless Self Supporting Towers at discounted prices,
> > See http://www.mscomputer.com
> >
> > Wireless Weather Stations now $349.95. Call Toll Free,
> > 888-333-9041 for additional information.
> > _______________________________________________
> > Towertalk mailing list
> > Towertalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
>
>
> --__--__--
>
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>
> End of Towertalk Digest