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Re: Topband: beverage lobes

To: <topband@contesting.com>
Subject: Re: Topband: beverage lobes
From: "Tom Rauch" <w8ji@contesting.com>
Reply-to: Tom Rauch <w8ji@contesting.com>
Date: Sun, 7 Jan 2007 09:31:32 -0500
List-post: <mailto:topband@contesting.com>
> Staggered Beverages narrow the horizontal lobe, to get low 
> vertical lobes you need to go long beverages or long and 
> stagerred, and down hill if possible.

Not so. Staggered Beverages can place a null almost anywhere 
depending on stagger distance and phase.  With 180 degree 
phase shift you can get a null straight up (and to the 
sides). Generally the stagger works best to control or 
improve F/B ratio or suppress high angle lobes. It actually 
doesn't do as much at all for lobe width.

The high angle lobe generally doesn't contribute much noise. 
S/N is largely a function of directivity, and that is not 
impacted much by a few narrow spurious lobes.

For Beverages in Echelon (stepped):

http://www.w8ji.com/echelon-log_beverages.htm

73 Tom 


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