John Devoldere describes an 80m 2 el parasitic INV-V beam in his Low Band
DXing book. This beam uses a length of coax to provide reactance of -j65ohms
on one element to make it into a director. I plan to build this beam and
install it at 89'. However, I need help to determine if a SHORTER BOOM of
only 24' instead of Johns design of 33' will still provide some decent gain.
(I use a crank-up and can't install a longer boom because of neighbor
problems).
I read a great article on Mr. Cebik's (W4RNL) homepage (great spot) which
describes improving forward performance by shortening the spacing on 2 el
yagis. Will this hold true on this type of beam?
I'm also interested in this antenna because of the lower angle of radiation
which John explains is a result of the second element....even if I sacrifice
FB maybe it's worth it just for the lower TOA?
I know this isn't 160, but similar scaled designs could be used on 160?
If anyone can help through experience or technical brilliance/understanding
it would be greatly appreciated.
73 de Steve VE6WZ.
--
FAQ on WWW: http://www.contesting.com/topband.html
Submissions: topband@contesting.com
Administrative requests: topband-REQUEST@contesting.com
Problems: owner-topband@contesting.com
|