[BC] Skirt feeds.....

[Tom Spencer]

Well, I tried it in EZNEC with the "tower" grounded (I didn't do all the 
fiddly bits with the cross-members, just 4 ea 2" pipes)...

I wound up at .3 wavelengths, capacitive (51 -j1700 something), aluminum 
(the resistance for steel wasn't an available choice)...

and the VSWR looked like the Rocky Mountains...

with the matching coil; that is.

I had to float the drive point (the bottom of the center wire) in order 
to get ANY reading... grounded, I had a negative resistance.

2' face, 4 leg tower, BTW.

Using 1/4 wave elements, I had to drive the TOP of the setup in order to 
get any meaningful results; about 6 +j 1200 or so.

I did put cross members at the top to connect the four legs and the 
center wire.

I need to go make a run; I'll try the ungrounded tower later and see 
what that does.

Cowboy wrote:

snip
>  The term "inverted unipole" says to me, a conventional
>  monopole, skirted but with the skirt shorted at the base, 
>  the base insulated from ground, and fed across the skirt and
>  tower at the top.
>  Again, the only case I know of where this was tried, was me,
>  many moons ago. It worked, but was difficult to match.
>
>   

-- 
Tom Spencer
PG-18-25453 (nee' P1-18-48841)
http://radioxtz.com/