Tom,

I'll give you an A in Sociology, but a  D in math.

I  think it's wrong to only add to 1 end and not the other.  The correct 
ratio is   roughly 2 feet on the long end and 1 foot on the short end.

Per the formula on the link you provided last week:
 For 132 ft. total length, long side = 132 X .64 = 84.48 ft.
short end = 132 x .36 = 47.52 ft.

This thing should tune on 80, 40, 20, 17, 12, 10.  Also 6 meters if your 
balun will handle it.

Good luck, see  you this weekend, Steve KW3A


----- Original Message ----- 
From: "T Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 09, 2008 7:35 PM
Subject: Windom analysis and troubleshooting


> Hi, folks.
>
> As promised, I had some time this evening to use my new TW1 to take some
> systematic SWR readings on my re-constructed Windom antenna.
>
> To give you the short story, my original windom was a coax-fed 80-meter
> Windom.  It was fed by RG8U coax, and had a 4-1 balun at the feed point on
> my tower.  The feedpoint and legs were all about 35 feet off the ground.
> The short leg was 44 feet long, and the longer leg was 80 feet long--which
> turned out to be way too short.
>
> Last Sunday, I had a friend come over, and we added 9 more feet to the 
> long
> leg, based on re-calculating our formula for an off-center fed 80-meter
> windom.  Our new calculations suggested that the proper length for the
> entire antenna should be 132 feet--44 feet on the short end, and 88 feet 
> on
> the long end.  The antenna heights are the same as before, and the new
> 8-foot extension on the longer leg is hanging down vertically, since I had
> no room to extend it horizontally.
>
> My SWR's are considerably better than they were before, but they still 
> don't
> seem great.  Let me give you some readings to show you what I mean:
>
> I took readings at the low end, the center, and the high end, of the
> following bands, and came up with the following SWR readings:
>
> 80 meters:
> 2.9 2.1 1.1
>
> 40 meters:
> 3.3  3.1  2.3
>
> 20 meters:
> 3.0  2.4  1.7
>
> 15 meters:
> 3.8  3.9  4.8
>
> 10 meters  from 28.05  to 28.5(very surprising):
> 5.1  4.7  3.4
>
> 17 meters:
> 1.7  1.8  2.0
>
> 30 meters:
> around 8.1 to 1 throughout--basically untunable.
>
>
> I guess what surprised me the most was that the antenna was lengthened an
> entire 8 feet on the long end, and still seems to resonate toward the top 
> of
> 75 meters, and I thought My SWR's would be better all around on 40, 20, 
> 15,
> and 10 meters.
>
> The great SWR's on 17 meters also surprised me.
>
> I didn't expect the antenna to tune well on 30 meters, which is no problem
> since I never use that band anyway.
>
> Can anyone tell me what might be going on here?  Does anyone have
> suggestions for modifications that might improve things?
>
>
> I think the antenna is clearly usable for this week-end's PA qso party,
> since the TS480 auto-tuner should tune it with no problem on 40 and 80, 
> but
> I'm interested in trying to make things better all around.
>
> Thanks for any help you can give.
>
> 73 from Tom Behler:  KB8TYJ
>