tom,

The formula for the short side is  length times .36, not .34

If the long side is 64 percent of the antenna, and you only make the  short 
end 34 percent, you  only have 98 percent of an antenna.   That last 2 
percent is where all the DX is.

Pencils down class.


Another way of looking at the addition of 8 feet is:
8 x .64 =5.12 feet added to the long side.

8 x .36 =  2.88 feet added to the short side.
73, Steve KW3A
----- Original Message ----- 
From: "T Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 09, 2008 8:56 PM
Subject: Re: Windom analysis and troubleshooting


>    Steve:
>
> I disagree with your math on the short end.
>
> When I multiply 132 feet by .64, I get 84.48 feet, but when I multiply 132
> times .34, I get 44.88 feet.
>
> This would indicate that my short end is still ok, but the long end is
> indeed too long.
>
> Am I correct here?
>
> 73 from Tom Behler:  Kb8TYJ
>
> ----- Original Message ----- 
> From: "Steve Forst" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, October 09, 2008 8:00 PM
> Subject: Re: Windom analysis and troubleshooting
>
>
>> 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
>>>
>>
>