Topband: beverage layout

[Bill Hider]

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 at 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 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/

 

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.7227 / Virus Database: 4457/10956 - Release Date: 11/06/15