[TowerTalk] 160 Meter Antenna on a City Lot

[Chris BONDE]

What I am trying to do to see if it works.

Making ladderline, almost finished.

I have a pole about 30ft, to be guyed at 20ft, then guys and antenna at 30ft.  Both 
top guys at right angles to the wire, one of which will be the carrier for the ladder 
line.  Now the antenna wire.  From the centre 30ft mast down to a 20ft mast (both 
sides) about 30ft, then at a slight angle so that I have a "Z" with the ends.  This will 
give me about 60ft for both sides, 80m dipole.  Then I plan on making some sort of 
loading, say linear, or a coil plus more wire back into the centre mast.  Now. I 
understand that most of the radiation takes place in the mid-section of the dipole as 
that is where the current is, and less further on the wire, in fact 50% is in about 33% 
of the antenna (Sine wave).  If I get it up and the loading figured out I think that I 
shall have a great cloud warmer on 160m and not a bad on 80 and maybe 
something on 40.  Using a balanced tuner, with the last part of the line being 2 
pieces of TV coax.

Think it will work?
Chris opr VE7HCB 
,
Date sent:      	Thu, 02 Oct 2003 14:14:38 +0000
From:           	Alan Beagley <ab2os at optonline.net>
Subject:        	Re: [TowerTalk] 160 Meter Antenna on a City Lot
To:             	Lee Buller <k0wa at swbell.net>
Copies to:      	TowerTalk <towertalk at contesting.com>

> What about a (folded) unipole with an ATU? See pp. 7-47f. of the
> ARRL's _Hints and Kinks_ (15th. ed.). That's what I'm planning to try
> when I get my tower up.
> 
> Alan AB2OS
> 
> 
> On 10/02/03 09:32 pm Lee Buller put fingers to keyboard and launched
> the following message into cyberspace:
> 
> > Ladies and Gents....
> >  
> > This summer, I lost the far leg support of my 160 meter Inverted-L. 
> > The 75 foot elm tree did not survive a 90 mph micro-gust (the tower
> > did) and it broke in half.  I have to cut the rest of it down.
> >  
> > That leaves me with a problem.  I have other place to hang the
> > horizontal leg of the 160 meter Inverted-L.  So, what do I do?  I
> > have a 60 foot tower with a TH6DXX on the top, but my track record
> > of shunt feeding the tower is not all that great.  Yes, I have a
> > pretty good ground under it...not great...but OK.  I've used a lot
> > of different variable caps on the shunt but tuning it has been 2:1
> > at best.
> >  
> > How about a trapped dipole?  I can get a 80 meter inverted-vee on
> > the lot.  So, I was wondering if a trapped system would work and how
> > well?  I would think that the band width of such a device would be
> > small, but so it s a shunt fed tower. as well as the Inverted-L.
> >  
> > So, anyone have some great ideas?
> 
> 
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