Topband: BOG question

[donovanf at starpower.net]

Hi Chuck, 


Of course, W8JI's reply is right on the mark. The Vf of the BOG affects 
only signals transiting the BOG wire in transmission line mode, it has 
no affect of the placement of BOG antennas in a phased array. 


Ideally the broadside spacing should be about 350 feet. End fire 
spacing should be 70-130 feet with larger end fire spacings producing 
significantly stronger signal levels. 


73 
Frank 
W3LPL 

----- Original Message -----

From: "Chuck Hutton" <charlesh3 at msn.com> 
To: donovanf at starpower.net, "160" <topband at contesting.com> 
Sent: Thursday, October 1, 2015 9:06:48 PM 
Subject: RE: Topband: BOG question 


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 
>