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Author Topic: V or L?  (Read 868 times)
K5END
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« on: May 21, 2008, 05:54:06 AM »

Assuming all things equal with all rf requirements met and optimized for either design, which would be the better choice for 80 meter band operation in limited space: inverted L or V, and by how much would expect the difference to be?

I can put in a first-rate L, but it would take a lot of blood, sweat & tears to get a decent V over my lot.
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K0BG
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« Reply #1 on: May 21, 2008, 06:09:07 AM »

Well, you answered your own question.

Given the fact that one location can have vastly different ground conditions, trees, fences, gutters, etc., the appropriateness on one antenna over another is all but moot. You use what you can, in other words.

Alan, KØBG
www.k0bg.com
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WA3SKN
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« Reply #2 on: May 21, 2008, 06:27:10 AM »

A half wavelength antenna radiates the same either fed from the center or from the end, if at the same height.  Now some designs are better for multi-band use than others, but the pattern is the same.
So, install and match as best you can, and enjoy!
73s.

-Mike.
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K5END
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« Reply #3 on: May 21, 2008, 06:28:56 AM »

Thanks, Alan.

I didn't ask the right question. :-)

Follow up question: assuming I live on a flat copper wire disposal land fill with no trees, and my house is subterranean, how much improvement would one expect from a V over an L after making the additional effort to install the V?

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WA3SKN
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« Reply #4 on: May 21, 2008, 06:43:49 AM »

The L will have a little more directionality than the inverted V, do to the ends being closer to ground.

-Mike.
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K8KAS
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« Reply #5 on: May 21, 2008, 10:12:23 AM »

You don't say what kind of operating you do, DX or Local stuff. An L with a good ground system is a good all around antenna, it will be generally speaking be 3 to 5 db down 200 or 300 miles on 80 meters but will be up 8 to 10 db on the DX/Long haul from the Vee at 50 feet say. I have had 3 or 4 L antenna's up over the years with a 30 to 100 radial ground systems, I love them. The Inverted Vee at a height less then 1/2 to 5/8 wl is a high angle antenna and as such nice local rag chew antenna. FYI there is no directional qualties with the Vee below 1/2 wl and even at that height not much. Denny
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WB6BYU
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« Reply #6 on: May 21, 2008, 10:48:56 AM »

As K8KAS asked, "who do you want to talk to?"

Generally an inverted L designed for predominant vertical
polarization will be better for DX (out beyond, say, 500
miles) or very close in work (perhaps to 20 miles, assuming
that the other station is also vertically polarized.)  The
inverted vee (horizontally polarized) will be better for local work out to a couple
hundred miles which requires high angle radiation.
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AA4PB
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« Reply #7 on: May 21, 2008, 11:14:05 AM »

It depends on the length of the inverted-L but if it is designed so that a high current is in the vertical section then it will be predominantly an omni-directional vertical antenna.

You can check the pattern of your particular design by modeling it.
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W7ETA
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« Reply #8 on: May 21, 2008, 01:47:04 PM »

You can down load a FREE trial version of EZENC,com modeling software and see the difference.
73
Bob
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W4VR
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« Reply #9 on: May 21, 2008, 02:55:43 PM »

I would go with K8KAS's suggestions.  His comments are based on lessons learned as a senior radio operator.
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K5END
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« Reply #10 on: May 22, 2008, 04:24:59 AM »

Thanks very much for the responses.

To answer K8KAS, I'm more interested the long runs. So it looks like the L wins this round.

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KB9CRY
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« Reply #11 on: May 22, 2008, 09:36:04 AM »

V for domestic use

L for DX
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K5END
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« Reply #12 on: May 27, 2008, 08:33:53 PM »

I've definitely decided which to do, "V" or "L."

Both!

Seriously, I wouldn't be the first one to try both.
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