[Towertalk] 20 Year-Old Tri-Ex LM-470D Telescoping Tower
Paul Playford
w8aef@worldnet.att.net
Thu, 26 Dec 2002 04:01:12 -0000
I recently sold an LM-470 with a concrete base for over $2000. It had the
motor on it and an after market remote up/down panel (no control box, but
easily constructed).
The concrete bases are still available, maybe $300.
You may want to check the ratings on the cables that were replaced. The
spec on the original cable is:
FLEXIBLE GALVANIZED AIRCRAFT CABLES OF 7 X 19 TYPE SHALL CONFORM TO A DESIGN
LOAD EQUAL TO 1400 POUNDS FOR 3/16 INCH SIZE. THE MANUFACTURER'S
CERTIFICATE OF GUARANTEE FOR MINIMUM BREAKING STRENGTH SHALL SHOW A BREAKING
STRENGTH OF THREE TIMES THE DESIGN LOAD OF 1400 POUNDS FOR EACH FOLL OF
CABLE AND SHALL BE SUBMITTED FOR EACH JOB TO THE BUILDING DEPARTMENT UPON
REQUEST.
Which I interpret to mean 3/16" x 7 x 19 galvanized aircraft cable with a 3
x 1400 (or 5200) pound breaking strength. A set of new cables are available
for about $300.
The base and cables are available from Tashjian, advertised in QST.
And I will be re-cableing my LM-470 this spring as I purchased it used and I
don't know how old the present cables are.
de Paul, W8AEF
----- Original Message -----
From: "W1GOR" <W1GOR@Maine.RR.Com>
To: <towertalk@contesting.com>
Sent: Wednesday, December 25, 2002 6:06 PM
Subject: [Towertalk] 20 Year-Old Tri-Ex LM-470D Telescoping Tower
> 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
>
>
> > Send Towertalk mailing list submissions to
> > towertalk@contesting.com
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
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> > or, via email, send a message with subject or body 'help' to
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> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Towertalk digest..."
> >
> >
> > 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
> >
> > --- StripMime Report -- processed MIME parts ---
> > multipart/related
> > multipart/alternative
> > text/plain (text body -- kept)
> > text/html
> > image/gif
> > ---
> >
> > --__--__--
> >
> > 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
> > Only $9.95 per month!
> > Visit www.juno.com
> >
> > --__--__--
> >
> > 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
> > >
> >
> >
> >
> > --__--__--
> >
> > _______________________________________________
> > Towertalk mailing list
> > Towertalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
> > End of Towertalk Digest
>
> _______________________________________________
> 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