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
>[mailto:firstname.lastname@example.org] On Behalf Of Stone, Gary R.
>Sent: Thursday, August 03, 2006 7:28 AM
>To: email@example.com; 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.
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