Topband: Modeling a BOG

[Tom W8JI]

I highly doubt any NEC based model predicts an accurate pattern for wires 
buried in dirt, in ground contact, or very near normal earth.

It would mostly be a case of GI =GO.

73 Tom



----- Original Message ----- 
From: "James Wolf" <jbwolf at comcast.net>
To: "'Mike Waters'" <mikewate at gmail.com>
Cc: "'topband'" <topband at contesting.com>
Sent: Saturday, February 21, 2015 8:50 PM
Subject: Re: Topband: Modeling a BOG


> 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.
>
>
>
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