Topband: Modeling a BOG

[James Wolf]

Mike,

 

The reason the beverage wire in the model is 2 ft. below the surface is to have it away from the ground somewhat and have a nice segment length from the wire to ground on each end.  The model shows only about 2 dB difference in gain and no pattern difference between the wire 1” below ground and 2ft., which I suspect could be correct for 160 meter frequencies.  Of course, the pattern is the problem.

 

In practice, I would lay it on the ground and after a few years, it would be just below the surface.  

 

Hmmm.  BBG – Beverage Below Ground.

 

Jim – KR9U

 

From: Mike Waters [mailto:mikewate at gmail.com] 
Sent: Saturday, February 21, 2015 8:26 PM
To: jbwolf at comcast.net
Cc: topband
Subject: Re: Topband: Modeling a BOG

 

I have never heard of anyone burying a BOG. The radials could be buried an inch or so, but a BOG should lay on the ground or slightly above. 2 ft. is two feet too deep.

About 200' is a common length for a BOG on 160.

73, Mike

www.w0btu.com

 

On Sat, Feb 21, 2015 at 6:51 PM, James Wolf <jbwolf at comcast.net> wrote:

I am trying to model a BOG (Beverage On or in the Ground). ... As soon as I drop the antenna below ground level, approx. 2 ft. without errors,  I lose all indication of directivity except for a few dB.   I have tried different lengths from 200 ft. to 800 ft.