[TowerTalk] RFI Radius vs Ant Height

[Keith Dutson]

I am wondering if it is the height or the more efficient antenna(s), or
both.

73, Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Stone, Gary R.
Sent: Thursday, August 03, 2006 7:28 AM
To: k1ttt at arrl.net; Pat Barthelow
Cc: towertalk at 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



-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of k1ttt at arrl.net
Sent: Thursday, August 03, 2006 6:38 AM
To: Pat Barthelow
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] RFI Radius vs Ant Height

A very important step in starting operation in a place like this is to put
up the tower and antenna... but NOT connect the feedline for at least a
week.  That will give you a chance to find out who has other tvi/rfi
problems before you get on the air.  I know this will be tough, but it is
normally well worth the restraint to flush out the complainers and show them
that it can't be you causing their problem.

keeping your own house clean is another big step, if you can show them a TV
sitting next to the amp that is clean while you are transmitting, and a
phone with no noise, it can help make the point that its not your equipment
but likely are their appliances that are at fault.

> Its been a very long time since I ran an HF KW from a residence.  At a
new
> QTH, I am contemplating doing so, using a yagi on a tower, say at 60
ft.
> I
> am now at a fairly dense subdivision, shown here on a google map.
> See:
>
> Click on:
>
http://maps.google.com/maps?f=q&hl=en&q=Rocklin+CA&ie=UTF8&ll=38.780237,
-121.260095&spn=0.004023,0.010815&t=h&om=1
>
>
> I am in the house near the center of the aerial photo;  bounded by
Lincoln
> Ave to the West, Springview Drive to the East, South Whitney Blvd to
the
> North, and Glacier Drive  to the South.
>
> The house has a  race track-shaped blue color,  swimming pool in the
back
> yard.   Roughly center of the photo.  As you can see, an arbitrary
radius
> circle of say 500 ft, ecompasses a large number of houses, perhaps 60
or
> 70.
>
> Question is:
> What has others experience been while running KW level HF stations, as
to
> typical or maximum distances from your station tower/antenna, to homes 
> experiencing objectionable RFI to various home electronics.  If say,
500
> feet, in my case I may irritate 60 or 70 households.  If the RFI
affected
> radius is larger, I am in even more trouble with neighbors..
> Raising the antenna from, (small multiband yagi) say, a  modest 40 ft
to,
> say 70 feet... will that ameliorate the neighborhood  RFI very much
for an
> HF KW?
>
> Maybe I should think towards building a club/Public Service/Contest 
> oriented station at a location near, but out of subdivision 
> interiors.....OR...Going QRP.....
>
> Tnx
>
> 73, DX, de Pat AA6EG aa6eg at hotmail.com;
>                   Skype:  Sparky599
>
>
> _______________________________________________
>
>
>
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