[Top] [All Lists]

Re: [TowerTalk] RFI Radius vs Ant Height

Subject: Re: [TowerTalk] RFI Radius vs Ant Height
From: Dave Fuller <>
Date: Thu, 03 Aug 2006 10:05:05 -0600
List-post: <>
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
>73, Keith NM5G
>-----Original Message-----
>[] On Behalf Of Stone, Gary R.
>Sent: Thursday, August 03, 2006 7:28 AM
>To:; Pat Barthelow
>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

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>