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Re: Topband: 160m L impedance??

To: John <fraz1@bellsouth.net>
Subject: Re: Topband: 160m L impedance??
From: Herb Schoenbohm <herbs@surfvi.com>
Reply-to: herbs@surfvi.com
Date: Mon, 08 Dec 2008 20:32:57 -0400
List-post: <topband@contesting.com">mailto:topband@contesting.com>
John wrote:
> OK Gurus......
>
> Quarter-wave L, vertical to 66 feet, balance horizontal.  32 radials on the 
> ground, length ranging from 35 to 68 feet with a good mix of those lengths.  
> Using 14 solid copper, insulated wire.  At the feed point, I see the lowest 
> SWR of 3.2 at 1.820 MHz.  But, the impedance measures 80 +/- ohms!   My soil 
> is mostly sand, although it is a top soil, sand mix. 
>
> The "bad" news is the antenna works OK....128 in two seasons.
>
> Why the high impedance?  
>
>   
Most likely ground losses make the impedance high...try adding even if 
temporary some 1/4 wave radials or lay some large squares of rabbit or 
chicken wire in all directions to mitigate the lossy ground and measure 
the difference obtained.

Good luck,

Herb, KV4FZ

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