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Author Topic: Asymmetric Inverted-V Apex Angle  (Read 10362 times)

K6ELQ

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Asymmetric Inverted-V Apex Angle
« on: April 17, 2013, 11:29:35 AM »

I'm thinking of installing a 40m inverted-V antenna off the side of my tower at a apex height of 38 feet. The resulting geometry will provide a 86.9 degree apex angle, however it will not be symmetrical. With respect to the apex center, one side will be at 37.5 degrees and the other will be 49.4 degrees. Any thoughts as to performance (or problems) compared to a perfectly symmetrical antenna?

73 de K6ELQ Tony
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N4CR

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RE: Asymmetric Inverted-V Apex Angle
« Reply #1 on: April 19, 2013, 10:33:18 PM »

It will work. Put it up and use it. Nobody here can tell you how it will work better than you can by trying it out.
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73 de N4CR, Phil

Never believe an atom. They make up everything.

W9GB

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RE: Asymmetric Inverted-V Apex Angle
« Reply #2 on: April 20, 2013, 05:14:06 AM »

Quote from: K6ELQ
With respect to the apex center, one side will be at 37.5 degrees and the other will be 49.4 degrees. Any thoughts as to performance (or problems) compared to a perfectly symmetrical antenna?
You should not have any problems.  The antenna pattern is influenced not only by the geometry you described, but also the height above the ground (incidental reflections).

As Phil said, put it up and measure actual results.  
The other option is virtual computer modeling ....
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K6ELQ

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RE: Asymmetric Inverted-V Apex Angle
« Reply #3 on: April 20, 2013, 08:26:19 PM »

Thanks for the replies and you're both probably right. I have a half-sloper (IAC Double Bazooka) at that position now that loads (≈1.0:1) and works very well but it is very noisy (nearby 66KV power line in a coastal environment). I'll post the results after I do the swap.

73 de K6ELQ Tony
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K6ELQ

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RE: Asymmetric Inverted-V Apex Angle
« Reply #4 on: May 23, 2013, 05:15:06 PM »

I was able to revise my lower anchor points and wound up with approximately 51.0 degrees and 54.8 degrees for a total of 105.8 degrees. So far seems to work just fine.
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