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Re: Topband: Loaded BOG Rx Antenna - 160 meters

To: "Topband Ref" <topband@contesting.com>
Subject: Re: Topband: Loaded BOG Rx Antenna - 160 meters
From: "Chris Zeal" <chris@profile-technology.com>
Reply-to: Chris Zeal <chris@profile-technology.com>
Date: Wed, 10 Mar 2004 08:24:16 -0000
List-post: <mailto:topband@contesting.com>
Hi all

Thanks for the replies below from Bob and Eric to my mail of 8 March.

What do you expect that lumped inductance in the middle of the wire (or 
anywhere else, for that matter) to accomplish? I can't see anything in the 
theory of that antenna, which is somewhat limited, that hints at this.

What is the purpose of the loading?  Slowing the signal on the wire is not 
helpful.
Termination value changes with weather conditions, ground characteristics. 
200 ohms is a fair average value (for resistor itself). 20 ohms is certainly 
too low unless the ground connection itself is in the range of 200

Both points are noted and appreciated.  I am not in a position to argue 
technically.  However my aim was to compensate for the shortened length of BOG 
while accepting additional signal loss.  If loading is not worthwhile where 
does this leave the 'slinky' type system?

Incidentally the ground here is very poor and probably does account for the 
high resistance earth connection.  I am feeding via a 1:9 transformer (I tried 
a 1:4 first).

I shall carry on with the experimentation.

Regards, Chris G4BGM


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