[Towertalk] Quad Support

[n4kg@juno.com]

Hello Tim,

A few comments.

First, I once had a 2L Delta Loop suspended from a 20 ft alumunum
boom (2 inch O.D.) at 120 ft.  I placed pulleys at each end of the boom
with a closed rope loop (closeline style) to allow me to attach the loops
at the tower and pull them out to the ends.  I formed small rope loops
around the boom to hold the wires.  It was a KILLER antenna !

At 80 ft, I would recommend inverted vee elements instead of loops,
to maintain as high an effective height as possible.  I use a 2L 
40M inverted vee beam at our Field Day site with a 70 ft reflector
at 50 ft.  It plays very well for USA, but 80 ft would be better for DX.
I recommend pulling the ends out as far as possible with light nylon
cord to maximize the apex angle.

Another option would be to use two equal length elements fed with 3/8 WL
of coax and switch both sides of the coax, allowing for quick reversal.
The unfed element plus 3/8 WL coax stub acts as a decent reflector.
A single dipole could be placed perpendicular to those elements, under
the boom for plus / minus 90 degrees without having to rotate any 
elements. 

Tom  N4KG

On Sun, 9 Jun 2002 "Tim Makins, EI8IC" <contesting@eircom.net> writes:
> I was thinking of suspending 2 40m diamond-configuration quad loops 
> from the top of an 80'  steel scaffold-pole mast.
> 
> Option 1 is put a  horizontal 20' length of timber with central 
> pivot at the top of the mast, thus spacing the loops correctly, 
> and allowing them  to be 'walked around' to the desired direction.
> 
> Option 2 is to mount the tops of both loops on insulators at the top 
> of the mast, and pull the sides and bottoms of the loops away from the 
> mast, pyramid-fashion.
> 
> What are the pros and cons of both options, and which do you prefer 
> for best DX performance ?
> 
> 73s Tim EI8IC
> www.qsl.net/ei8ic/
> Irish and Budget Contesting
> Last Updated: 07Jun2002
> 
> 
> 
> 
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk


________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today!  For your FREE software, visit:
http://dl.www.juno.com/get/web/.