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#1
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Long inverted V not working well, why?
On Sat, 12 May 2007 10:37:13 -0400, Rick (W-A-one-R-K-T) wrote:
Thanks for the pointer. That one was a real eye opener. I always thought that any angle 90 degrees or greater at the feedpoint was OK. I think mine is something like about 100 degrees. Actually I just calculated it out and it's more like around 130 degrees, or each leg is just 25 degrees down from horizontal. So, according to Cebik that should be pretty good. |
#2
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Long inverted V not working well, why?
Rick (W-A-one-R-K-T) wrote:
On Sat, 12 May 2007 10:37:13 -0400, Rick (W-A-one-R-K-T) wrote: Thanks for the pointer. That one was a real eye opener. I always thought that any angle 90 degrees or greater at the feedpoint was OK. I think mine is something like about 100 degrees. Actually I just calculated it out and it's more like around 130 degrees, or each leg is just 25 degrees down from horizontal. So, according to Cebik that should be pretty good. What is the length of your feedline? -- 73, Cecil http://www.w5dxp.com |
#3
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Long inverted V not working well, why?
On Sat, 12 May 2007 12:47:32 -0500, Cecil Moore wrote:
What is the length of your feedline? That I don't know at the moment. I downloaded your imax.exe program and ran some numbers. There sure aren't very many numbers that are good for all bands 160 through 10. No doubt my feedline is wrong for a lot of frequencies, made more clear by the fact that there are a few frequencies where my LDG autotuner can't find a match. However, how much does the feedline length matter IF the autotuner is able to find a good match point? I can get 1.5:1 or better from everywhere in the 160 and 80 meter bands, and the high end of the 40-meter band (on the low end I can't get below about 2:1). I'm about to go outside and try some different feedline lengths. |
#4
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Long inverted V not working well, why?
Rick (W-A-one-R-K-T) wrote:
No doubt my feedline is wrong for a lot of frequencies, made more clear by the fact that there are a few frequencies where my LDG autotuner can't find a match. However, how much does the feedline length matter IF the autotuner is able to find a good match point? Some impedances are outside the matching range and some impedances are barely inside the matching range. Some of the latter may not be a "good" match point. I model my antenna systems to get a ballpark idea of what impedance I am up against and use an antenna analyzer to fine tune the system. -- 73, Cecil http://www.w5dxp.com |
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