Hi Mike,
I appreciate your comments.
I need to discuss this further with you – After SS CW.
I’ll be in touch next week.
TNX,
Bill N3RR
From: Mike Waters [mailto:mikewate@gmail.com]
Sent: Friday, November 06, 2015 5:21 PM
To: Bill Hider
Cc: topband
Subject: Re: Topband: beverage layout
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@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/
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