Topband: BOG question

[Jim]

Frank et. al, 
The ground does indeed affect the Vf however different types of wires/cables are affected differently and the only way to know for sure is 
to measure the Vf yourself. I use old telephone cable ( C Rural wire) for my BOG and it is distinctly different from the normal window line used on my elevated Beverage or someone else coaxial BOG.. So you gotta get out of the shack and do the leg (and sometimes brain) power to find the correct info. 

Jim WA3MEJ 

P.S. Frank to you have a soft copy of "Propagation Of High Frequency Currents In Ground Return Circuits" (1934) that you could part with 

Message: 1 
Date: Thu, 1 Oct 2015 21:06:48 +0000 
From: Chuck Hutton < charlesh3 at msn.com > 
To: " donovanf at starpower.net " < donovanf at starpower.net >, 160 
< topband at contesting.com > 
Subject: Re: Topband: BOG question 
Message-ID: < BLU184-W5B98DC5B4BAC3B78FE70BFC4C0 at phx.gbl > 
Content-Type: text/plain; charset="iso-8859-1" 

Frank: 
I believe there is a large influence of height above ground on VF. 
>From a theoretical basis, this has been "known" since Wise's classic paper "Propagation Of High Frequency Currents In Ground Return Circuits" (1934). 
This was experimentally verified in the Litva and Rook report from the CRC (Canada), and compared with theoretical results. 
These guys didn't extend their calculations to right-on-the-ground antennas. The attached (if it gets through the server) is from a spreadsheet of mine based on the Wise equations. The influence of height on VF is very very pronounced. 
Chuck 


> Date: Thu, 1 Oct 2015 11:23:16 -0400 
> From: donovanf at starpower.net 
> To: topband at contesting.com 
> Subject: Re: Topband: BOG question 
> 
> Hi Art, 
<CLIP> 
> Signals arriving at the BOGs are not travelling in the ground, therefore 
> their velocity of propagation (Vp) is unaffected by the ground. 
> 
> 73 
> Frank 
> W3LPL 
> 



Long Live Seal Team VI 

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