[TowerTalk] A3WS vs WARC7 Yagi

[n4kg@juno.com]

N4KG  response below.

On Sun, 17 Sep 2000  Bill Turner <w7ti@jps.net> writes:

> On Sun, 17 Sep 2000, n4kg@juno.com wrote:
> 
> >A rotary dipole at 
> >80 to 100 ft is a real KILLER on 30M.
> _________________________________________________________________
> 
> Tom, how much advantage is having the dipole rotatable?  How much
> directivity do you get, in other words?  I know what the theory
> predicts, but how does it compare to the real world?
> 
> Thanks,
> 
> 73, Bill W7TI

Compared to a SINGLE,  FIXED, Dipole, a rotary dipole
is a BIG benefit.  The nulls off the ends of a dipole ARE
significant.

The alternative is to have two or more fixed dipoles which
is what I do for 80M where I have one dipole aimed at
Europe between two 130 ft towers, an inverted vee at 140ft.
aimed at JA / SA on one of those towers, and another
inverted vee at 100 ft aimed at ZS / KH6 on the other.

A pair of D3W  WARC dipoles at right angles to each
other side mounted on tower legs is a good alternative
to a rotary dipole.  There will be times when you will
wish for 3 when chasing those exotic DX stations at
odd headings (FT/W,X,Z,  P29, 4W, etc.) or,
a ROTARY antenna.

de  Tom  N4KG


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