Topband: beverage layout

[Mike Waters]

Hi Bill,

I see you have a wide vertical spacing (
http://users.erols.com/n3rr/photos/dual_ew-1.jpg).
I don't doubt that they work well, as you say.

I did a fair amount of analysis about that design in the past. I forget the
finer details, and I'm not in the mood for any more math and modeling
today, but I want to throw out an idea.

That design might work slightly better if the spacing wasn't as large, or
if the wires were side-by-side. The way it is, the ground underneath it
unbalances it somewhat. The Z of the upper wire to ground vs. the Z of the
lower wire to ground is unequal.

Exactly how much difference in F/B in the reverse direction that makes, I
don't remember. But in some situations, changing the spacing or turning the
wires 90 degrees might make the difference pulling a weak one out of the
noise and QRM.

Not picking on you. Just food for thought. :-)

73, Mike
www.w0btu.com

On Fri, Nov 6, 2015 at 1:07 PM, Bill Hider <n3rr at erols.com> wrote:

> My Website has detail ... on my two 275' Beverages (E & W)  mounted on a
> single set of
> posts. ... I've been using all these since 2000.  ... Scroll down to the
> System Design links & click on "Beverages".
>
> Here:
> http://users.erols.com/n3rr/
>