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Re: [TowerTalk] RFI Radius vs Ant Height

Subject: Re: [TowerTalk] RFI Radius vs Ant Height
From: Dave Fuller <rfcdma@spinn.net>
Date: Thu, 03 Aug 2006 10:05:05 -0600
List-post: <mailto:towertalk@contesting.com>
For a given distance D to the antenna the field strength is proportional 
to 1/D(squared).   In other words double the distance  and you reduce 
field strength by 4.    Will be different for "near field" areas....not 
sure how far that is for a typical HF system.  

Keith Dutson wrote:

>I am wondering if it is the height or the more efficient antenna(s), or
>both.
>
>73, Keith NM5G
>
>-----Original Message-----
>From: towertalk-bounces@contesting.com
>[mailto:towertalk-bounces@contesting.com] On Behalf Of Stone, Gary R.
>Sent: Thursday, August 03, 2006 7:28 AM
>To: k1ttt@arrl.net; Pat Barthelow
>Cc: towertalk@contesting.com
>Subject: Re: [TowerTalk] RFI Radius vs Ant Height
>
>My experiences only:  When I was using a Cushcraft A4S at 45 feet I had a
>little TVI trouble in my own house (no close neighbors).  It showed up on
>some frequencies and was noticeable but not a real nuisance (from my
>perspective of course).  Then I changed to a new tower and new antenna.
>I now use an Optibeam at 80 feet and a Force 12 at 92 feet and have noticed
>NO TVI problems of anykind.  So, that is my experience and I am therefore
>convinced the extra height made a difference to TVI.
>
>Gary, N5PHT
>
>
>  
>
>  
>
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