[TowerTalk] Geometry of 80m 4sq suspended from tower

[K1TTT]

I used an arrangement like that hanging around a 120' tower for years with
the feedpoints and radials about 8' up.  It worked, but no where near as
good as the new one with towers as the verticals and no other towers or guy
wires nearby.


David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: Scott Dickson [mailto:w5wz at w5wz.com]
> Sent: Wednesday, January 06, 2010 13:58
> To: towertalk at contesting.com
> Cc: LCC at louisianacontestclub.org
> Subject: [TowerTalk] Geometry of 80m 4sq suspended from tower
> 
> Hello Friends!
> 
> 
> 
> The next planned improvement at W5WZ is an 80-meter 4-square.  It appears
> the most cost-effective option is to build it with wire vertical elements
> suspended from ropes off Tower 1 (currently the main tower).  However, I'm
> concerned that the geometry will create many undesirable interactions
> between the existing Yagis on the tower and the 80m vertical elements.
> 
> 
> 
> In the purest sense, this installation should use four ropes secured to
> the
> tower and the other four ends to other supports away from the tower, thus
> allowing the wire elements to hang as vertical as possible.  At my
> location
> this is not possible; in the direction from 310 degrees around to 130
> degrees, there are some trees at distances of up to 200 feet from the base
> of the tower.  But from 130 around to 310, there are no trees - only
> pasture
> - for many hundreds of feet away from the tower.
> 
> 
> 
> On my website, I've posted a PDF drawn to 1/8"=1 foot scale.  It
> represents
> the tower, the turn radius of the installed antennas, and a single
> vertical
> element with 4 possible geometries.   Please take a look, and let me know
> if
> I've overlooked any options.  The link is
> http://w5wz.com/main/page_towers.html    then go to the very bottom of the
> page.
> 
> 
> 
> Thanks for the help!
> 
> 73 de Scott, W5WZ
> 
> Louisiana Contest Club
> 
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> 
> 
> 
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