Hi Bob!
As this is a guyed (this does not work for self supporting towers) Rohn 25G
tower for you, why would you not install a Rohn pier pin (inexpensive)
instead of setting a portion of a section below ground in concrete? The pier
pin is a well engineered process that saves lots of hassle, does not waste
tower in the concrete and works much better from a stress (making sure there
is equal load on each of the legs when the guy system is attached and
tightened) standpoint.
All you have to do is insert the pin straight vertical and make sure the
concrete is level. Problem fixed!
There are some pier pin pictures on the K3LR web site.
73!
Tim K3LR
http://www.k3lr.com
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of AD5VJ Bob
Sent: Sunday, December 30, 2007 9:31 AM
To: k1ttt@arrl.net; towertalk@contesting.com
Subject: Re: [TowerTalk] Tower Update
Hi David and all:
Thanks for the information I was not aware of that, but am now.
I will make some phone calls and see what I can get done on delivery.
I guess another question would be, since I was thinking of leveling it with
a bubble level, but I dont have one that is over around
a 6" long. Will a plumb bob through the center of the first section be
accurate enough to make the tower straight as I go up in
height to say 80 feet or so?
I was rethinking the vertical leveling and thought I might just tie a string
at the center of the top of the section (ten foot
bottom section) I am going to cement in -
tie a rock or something to it
eyeball it to be in the center of the section
at the end of the string at ground level
then cement it in
But then remembered the higher I go
the more off center it will get if I am off at all at the bottom.
So would a three or four foot bubble level be the way to go instead?
Or would the plumb bob be accurate enough?
Bob AD5VJ
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of David
> Robbins K1TTT
> Sent: Sunday, December 30, 2007 9:03 AM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Tower Update
>
> That is the real reason to get concrete delivered... rohn
> specs call for 3000# mix, this is easy if you tell the
> company that is what you need. They will have a standard mix
> that will give you the required strength. Hand mixing I
> wouldn't trust to be able to duplicate that, or to be
> consistent throughout the pour.
>
>
>
> 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 AD5VJ Bob
> > Sent: Sunday, December 30, 2007 14:50
> > To: towertalk@contesting.com
> > Subject: Re: [TowerTalk] Tower Update
> >
> > Thanks guys for all the answers.
> >
> > I sent a similar email to my local contest group (NTCC) and
> they are
> > coming back with very much the same answers you guys are as
> well. So
> > there is allot of confirmation to what everyone is saying.
> >
> > Looks like its nix on the inside box, just put her in the
> ground and
> > make the top attractive.
> >
> > Looks like around 60 bags of concrete (just a *little* off
> of my guess
> > of
> > 10) would give me the 10% over that many of the
> experienced guys are
> > talking about.
> >
> > Now I am not sure where to rent a cement mixer.
> > I will make some phone calls today.
> >
> > Everyone is telling me that I really dont want to mix the
> cement one
> > bag at a time.
> > Especially not 60 or so - 80 lb bags.
> >
> > One guy locally said after you get the bags of cement
> stacked at the
> > tower location that it seems to be some law of physics that
> the weight
> > of the bags at the top seems to drain into the bags at the bottom
> > especially over night Hi Hi Hi so I might want to have some
> other way
> > to do this rather than one bag at a time by myself.
> >
> > Which brings up another good question, what kind of
> concrete do I get,
> > I just found out from a reply that there is more than one kind of
> > concrete.
> >
> > Someone just told me there are different mixes and
> therefore different
> > hardness's to concrete mix.
> >
> > What kind of concrete do we buy for our tower purposes in
> Ham Radio?
> >
> > Tnx Bob AD5VJ
> >
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>
> _______________________________________________
>
>
>
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