That's my point exactly.
Whole project is to put up 30' of Rohn 25 bracketed to the (roof/ceiling
joints) house at 20' level - that's it.
My only plan was to put some little foundation to prevent it from sinking in
dirt.
No big antennas on it. MQ-26 for now which might become MA5B in some very
distant future. The tower itself might become 40' - also in distant
future... I have only 6+ feet between back of my house and fence, so there
is not too much space for full-size turning radius beams hanging over my
neighbor's house.
It suppose to be "poor man beam on short tower" project, not "lets put a ton
of concrete into a base" :)
Alex K2BB
On Wed, Nov 17, 2010 at 8:08 PM, Roger (sub1) <sub1@rogerhalstead.com>wrote:
> On 11/17/2010 4:17 PM, J.Gordon Beattie, Jr., W2TTT wrote:
> > Ed,
> > Do what the manufacturer requires and you won't have trouble.
> Remember the ROHN "dirt base". I'm planning on 50' of 25G, bracketed to
> the end of the shop at roughly 18'. There will be a Force 12 C19XR at
> 50' and a WARC-7 at 60'. I'm using a 6' long, dirt base constructed out
> of 1" solid rod with 6" X 10" X 1/8" steel face plates. The tower will
> be guyed at roughly the 48' level using either 1200# test Phillystran or
> 3/16 800# test braided poly rope. I have no qualms about climbing said
> tower
> > Ask yourself who is climbing this thing and do you want to save a couple
> of
> > dollars on concrete
> At 30'?
> > and then have to address an issue should there be a
> > failure? There might be VHF and UHF antennas today and BIG YAGIS
> TOMORROW.
> In my case, if I go with larger antennas I'd replace the tower at that
> time. However I have used 40' of 25G on a dirt base holding a 5L KLM 20
> meter monobander, guyed at roughly the 38' level. It withstood nearly 70
> mph winds plus a monster ice storm that took out over half a mile of
> power line, Behind the house the power line had such a load of ice it
> was only about 4' off the ground.
>
> However, I don't have room to swing the larger antennas on the small
> tower any way so it's a moot point. Any thing big goes on the 45G
> system which is guyed at 3 levels. The bottom two use 4000# test
> Phillystran while the top tier uses 6000# test Philliystran. Guy
> anchors are about 17,000# each.
> > Don't take the risk.
> Risk is relative and also depends on how risk tolerant the individual
> is. I tend to be a risk taker with investments, but am quite
> conservative when it comes to antennas, towers, and climbing.
>
> 73
>
> Roger (K8RI)
> > Thanks& 73,
> > Gordon Beattie, W2TTT
> > 201.314.6964
> >
> >
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com
> > [mailto:towertalk-bounces@contesting.com] On Behalf Of Ed Swiderski,
> KU4BP
> > Sent: Wednesday, November 17, 2010 9:09 PM
> > To: TowerTalk@contesting.com
> > Subject: [TowerTalk] Short tower base question
> >
> >
> > All,
> >
> > I have a couple full pieces and one cut piece of Rohn 25 that I'd like
> put
> > up against the house with a couple VHF antennas on it. (2m-16el and
> > 432-18el) I plan on using a house bracket at about 3/4 of the height was
> > wondering if a full size base is neccessary? I have been told by a good
> > friend who used to work at installing towers that I can get away with a
> > smaller than spec base in this situation.
> >
> > Thank you,
> > Ed KU4BP
> >
> >
> > _______________________________________________
> >
> >
> >
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> > TowerTalk@contesting.com
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> >
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> >
> >
> >
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> >
>
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>
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