Hi Gerald,
Regarding your new QTH and the WX there, up here in Alaska we have the same
situation. Very high winds sometimes in excess of 110 MPH plus sever cold. I
have a Force 12 620/340 on an ANWIRELESS Tower, with a PRO-SIS-TEL 71 D
rotator. In my humble opinion the AN WIRELSS tower is the best free standing
tower made. Dan Simmons will work with you and give you all the engineering
spec you need. If you look at his web sight you will see the pictures of my
tower going up. I can not say the same for my 1st choice of rotators which
was the Alpha-Spid. It destroyed itself twice in medium high winds. I have
since installed the 71 D and have had no problems. I would not recommend the
2800.
Mike KL7AR
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of
towertalk-request@contesting.com
Sent: Thursday, April 05, 2007 8:01 AM
To: towertalk@contesting.com
Subject: TowerTalk Digest, Vol 52, Issue 17
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than "Re: Contents of TowerTalk digest..."
Today's Topics:
1. Towers, Rotators and Antennas in 100 MPH Windzones (Gerald Boutin)
2. Re: vertical height (R. Kevin Stover)
3. vertical height (Dennis OConnor)
4. Re: vertical height (Bob Maser)
5. aluminium welding wire (VE2RYY)
6. Photos of a Crank Up Positive Pull Down mechanism? (Rob Frohne)
7. Re: Photos of a Crank Up Positive Pull Down mechanism?
(FISCHER,GREG)
----------------------------------------------------------------------
Message: 1
Date: Wed, 04 Apr 2007 18:00:13 -0600
From: Gerald Boutin <VE6WA@infinichron.com>
Subject: [TowerTalk] Towers, Rotators and Antennas in 100 MPH
Windzones
To: towertalk@contesting.com
Message-ID: <000001c77715$636488a0$6602a8c0@VE6WA>
Content-Type: text/plain; charset=us-ascii
Howdy,
I am soon to be transplanted to eastern Canada, where after living stuck in
a relatively large city for almost 40 years, I will be out in a large
acreage in the countryside.
I am going to have room for more towers and antennas than I can ever afford.
My ultimate goal is an SO2R station that is more or less "competitive" in
contests. My other criteria is that I want a system that is going to stay up
for years at a time. No annual replacing rotators and rebuilding antennas. I
am also not on an unlimited budget.
While VE1 is very nice geographically for access to Europe, I am starting to
realize that there are challenges dealing with a 100 MPH wind zone. I have a
little bit of cushion in that I am in a sheltered area bordering on the
ocean in that my elevation varies from sea level to about 20 feet and the
property is situated in a cove inside a bay. OTOH, HFTA says I would be much
better off up on the 150 foot cliffs a few miles down the coast.
My thoughts are centered around something like a pair of stacked C31XRs at
40/80 or 50/90 feet with a Mag240N above at 87 or 97 feet. So, to my
question(s).
What do I need for a tower and rotator(s)? There's no way that 25G is rated
for this and from the best I can tell, it is too much for 45G as well.
Looking at Trylon's STG, I think it comes close I still need to go through
detailed calculations. (I've still not seen anyone comment on this tower. Is
anyone using it?)
A C31XR and Mag240N (H versions) is past the recommended ratings for the
G2800DX rotor. So, does this mean I am into PST71 and Prop Pitch territory?
My budget is groaning. Is there any (lower priced) option other than the TIC
Ring or K0XG for the bottom antenna? As I said, my bank account is being
threatened. I could fix the bottom antenna for EU but I would really like to
be able to do North American contests as well. Any suggestions on how to fix
mount the lower antenna so that it could be relatively easily manually
shifted from time to time?
I've also started looking at somewhat smaller antennas, but I don't see a
lot of options, especially for 40m, that look like they would be happy for
several years in this wind zone.
I could see putting up two 48 foot self-supporting towers each with a
tribander, and maybe a rotatable dipole for 40, but being so low in
elevation I'll really get killed on 40m, both to EU and the US, let alone on
DX stuff.
Suggestions, anyone?
--
Gerald Boutin, VE6WA (soon to be /1)
------------------------------
Message: 2
Date: Thu, 05 Apr 2007 07:01:14 -0500
From: "R. Kevin Stover" <rkstover@mchsi.com>
Subject: Re: [TowerTalk] vertical height
To: Gregg Seidl <k9kl@centurytel.net>
Cc: TowerTalk@contesting.com
Message-ID: <4614E50A.6010600@mchsi.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Gregg Seidl wrote:
> Can anyone tell me what height of Rohn 25 is needed to resonate at 3.8
> Mhz?I'm installing an insulated from ground tower and using Array
Solutions
> 160/80 and 75 tuner.It requires that 75 be resonate then switches in coils
> to resonate on the other bands.I will be using 5 10 foot sections,one
> tapered top section and then whatever I need in 1 and 1/4 inch
> conduit(pipe).Jay says it needs about 60 60 foot radials which is no
problem
> and I may have some longer then that and will most likely roll out some
> chicken mesh in winter.Just trying to minimize my tower climbing. Gregg
> K9KL
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
234/3.8 will get you in the neighborhood.
--
R. Kevin Stover AC?H
K2/100 #4684
Reclaim Your Inbox!
http://www.mozilla.org/products/thunderbird
------------------------------
Message: 3
Date: Thu, 5 Apr 2007 05:06:32 -0700 (PDT)
From: Dennis OConnor <ad4hk2004@yahoo.com>
Subject: [TowerTalk] vertical height
To: towertalk@contesting.com
Message-ID: <101590.53867.qm@web32703.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
For 3.5 mc you want 5 sections and a 1" stinger to 72 feet overall...
For 3.85 mc you want 5 sections and a 1" pipe to 64 feet overall...
I have not used the taper top section for my phased transmit towers so
there may be a 6" variance for that, usually towards the longer dimension...
Coupling to house wiring, etc., can/will change these dimensions a foot or
more... Only way to tell is put it up and tune it...
denny
---------------------------------
Food fight? Enjoy some healthy debate
in the Yahoo! Answers Food & Drink Q&A.
------------------------------
Message: 4
Date: Thu, 5 Apr 2007 09:46:10 -0400
From: "Bob Maser" <bmaser@tampabay.rr.com>
Subject: Re: [TowerTalk] vertical height
To: "R. Kevin Stover" <rkstover@mchsi.com>, "Gregg Seidl"
<k9kl@centurytel.net>
Cc: TowerTalk@contesting.com
Message-ID: <017901c77788$c5193690$0300a8c0@W6TR>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
The tower made with Rohn 25 will be in the 63-65 foot range. Before cutting
all those radials to 60 feet, you should read Al Christman's (K3LC) article
on optimum radial lengths that was published in the March 2004 NCJ.
Bob W6TR
----- Original Message -----
From: "R. Kevin Stover" <rkstover@mchsi.com>
To: "Gregg Seidl" <k9kl@centurytel.net>
Cc: <TowerTalk@contesting.com>
Sent: Thursday, April 05, 2007 8:01 AM
Subject: Re: [TowerTalk] vertical height
Gregg Seidl wrote:
> Can anyone tell me what height of Rohn 25 is needed to resonate at 3.8
> Mhz?I'm installing an insulated from ground tower and using Array
> Solutions
> 160/80 and 75 tuner.It requires that 75 be resonate then switches in coils
> to resonate on the other bands.I will be using 5 10 foot sections,one
> tapered top section and then whatever I need in 1 and 1/4 inch
> conduit(pipe).Jay says it needs about 60 60 foot radials which is no
> problem
> and I may have some longer then that and will most likely roll out some
> chicken mesh in winter.Just trying to minimize my tower climbing. Gregg
> K9KL
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
234/3.8 will get you in the neighborhood.
--
R. Kevin Stover AC?H
K2/100 #4684
Reclaim Your Inbox!
http://www.mozilla.org/products/thunderbird
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------------------------------
Message: 5
Date: Thu, 05 Apr 2007 14:11:36 +0000
From: VE2RYY <ve2ryy@globetrotter.net>
Subject: [TowerTalk] aluminium welding wire
To: towertalk@contesting.com
Message-ID: <000a01c7778c$5286a0f0$0100a8c0@zippo>
Content-Type: text/plain; charset=iso-8859-1
I have the opportunity of getting three spools of .035" al. welding wire.
each spool is about 20 lbs.
I wonder how many feet we get from one spool.
Anybody using this kind of wire for radials on 160.meters.
I wonder how long the radials will last on the ground?????
Copper is so expensive these days....
I would appreciate input on this ..
Thanks
NOEL
------------------------------
Message: 6
Date: Thu, 05 Apr 2007 07:45:18 -0700
From: Rob Frohne <frohro@wwc.edu>
Subject: [TowerTalk] Photos of a Crank Up Positive Pull Down
mechanism?
To: towertalk <towertalk@contesting.com>
Message-ID: <1175784318.4818.44.camel@frohro-d600>
Content-Type: text/plain
Hi,
I have two Tri-EX THD series towers and have had trouble with them
jamming when partially erected. I am thinking of putting a cable from
the top section to a pulley on the bottom section so that I could pull
down if necessary if it gets jammed again. I have read of a thing
called a "positive pull down" on some crank up towers, and would like to
see some photos of it before I do my thing, in case I'm missing
something, and they have a better way of doing it than I am envisioning.
Does anyone have any photos of a "positive pull down" mechanism?
Thanks & 73,
Rob, KL7NA
--
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla College
100 SW 4th Street
College Place, WA 99324
(509) 527-2075
http://www.wwc.edu/~frohro/
------------------------------
Message: 7
Date: Thu, 05 Apr 2007 10:51:59 -0500
From: "FISCHER,GREG" <ab7r@cablespeed.com>
Subject: Re: [TowerTalk] Photos of a Crank Up Positive Pull Down
mechanism?
To: frohro@wwc.edu, towertalk <towertalk@contesting.com>
Message-ID: <web-886300@be2.admin2.cablespeed.com>
Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
I've also wondered about the positive pull down. I have
an old Hygain manual for their electric winch (I don't
have the electric winch though) and it shows how to run
the positive pull down cable.
If I recall correctly, the cable runs from the bottom of
the 3rd section down to a pully at the bottom of the
second section up to the top of the second section. This
is repeated with another cable from the bottom of the 4th
section to a pulley at the bottom of the 3rd section and
up to the top of the 3rd section.
How does this create "positive pulldown" when it is still
gravity that brings the sections down when lowering with
the winch? Is it the weight of that 2nd section that is
being used to help pull down the lighter 3rd and 4th
sections?
Tnx
73
Greg
AB7R
On Thu, 05 Apr 2007 07:45:18 -0700
Rob Frohne <frohro@wwc.edu> wrote:
> Hi,
>
> I have two Tri-EX THD series towers and have had trouble
>with them
> jamming when partially erected. I am thinking of
>putting a cable from
> the top section to a pulley on the bottom section so
>that I could pull
> down if necessary if it gets jammed again. I have read
>of a thing
> called a "positive pull down" on some crank up towers,
>and would like to
> see some photos of it before I do my thing, in case I'm
>missing
> something, and they have a better way of doing it than I
>am envisioning.
> Does anyone have any photos of a "positive pull down"
>mechanism?
>
> Thanks & 73,
>
> Rob, KL7NA
> --
> Rob Frohne, Ph.D., P.E.
> E.F. Cross School of Engineering
> Walla Walla College
> 100 SW 4th Street
> College Place, WA 99324
> (509) 527-2075
> http://www.wwc.edu/~frohro/
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
------------------------------
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End of TowerTalk Digest, Vol 52, Issue 17
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