[Antennas] Mosley Classic 33 Balun?

Sat Dec 11 16:24:37 EST 2004

OK Don, the only other things are I should have used the word "stops" rather
than "decouples" where shield grounding is concerned. Of course only a Balun
"decouples" ;-) Coiling the feedline "chokes" RF, grounding "shorts" it.
I did note that users of your particular antenna think it important to do
this for best radiation pattern. In my opinion that's an incorrect
statement, there would be no difference in the radiation pattern whether it
was choked or shield-grounded or neither. But if the antenna requires
radials then of course the pattern would be affected by the lack of them.
> > I recently obtained a Mosley Classic 33 antenna that appears
> > to be in excellent shape. It has an SO-239 coax connector to
> > the antenna's "Classic Match". The Mosley website indicates
> > that for The Classic System: "To isolate the outer coax
> > conductor from ground, the coax line is coiled for a few
> > turns near the antenna end. This is designed to prevent the
> > very unlikely effect of Feed Line Radiation". I have also
> > heard that with the Classic 33, you can connect your coax
> > directly to the SO-239.
> >
> > Is this coiled coax actually needed and if so, how many
> > turns, what diameter is the coil and where is the coil
> > located? (I typically use RG-8 coax) Any comments regarding
> > this interface would be greatly appreciated. The coiled coax
> > may not even be required. This is unclear to me.
> >
> > Also, any repair / maintenance pointers would be helpful
> > before I put the antenna on my tower. Thank you.
> >
> > Don - WB0AIN