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Total 227 documents matching your query.

221. [TowerTalk] 1/4 wave vertical with counterpoise (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Fri, 16 Jan 2026 19:01:23 -0700
I mentioned before that I thought we should consider a radial system for a quarter wave vertical to be just a counterpoise, and it turns out that a bit of research says that is obvious.  That wouldn'
/archives//html/Towertalk/2026-01/msg00085.html (7,424 bytes)

222. Re: [TowerTalk] 1/4 wave vertical with counterpoise (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Fri, 16 Jan 2026 23:11:14 -0700
Thanks for the comments, Jim. Well, the reason I don't think a radial system necessarily provides any shielding effect is that there is VERY little difference in either takeoff angle or maximum field
/archives//html/Towertalk/2026-01/msg00087.html (15,373 bytes)

223. Re: [TowerTalk] 1/4 wave vertical with counterpoise (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 17 Jan 2026 11:10:31 -0700
It does not need a radial system of wires to avoid loss.  It just needs an alternative path to the earth for near field return currents, and that can be had with a proper counterpoise.  The modeling
/archives//html/Towertalk/2026-01/msg00090.html (9,063 bytes)

224. Re: [TowerTalk] 1/4 wave vertical with counterpoise (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 17 Jan 2026 11:22:57 -0700
Thanks, Mike! Yeah, the work you have done over the years with your 4-squares has been amazing.  I have been paying attention.  ;) As you say, nothing we do can change the effect that the ground has
/archives//html/Towertalk/2026-01/msg00091.html (11,826 bytes)

225. Re: [TowerTalk] 1/4 wave vertical with counterpoise (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 17 Jan 2026 15:09:02 -0700
Jim, I can see where my wording could be interpreted incorrectly since the word "to" has multiple meanings, but that isn't what I said.  Read it instead as "alternative to the earth path".  That's le
/archives//html/Towertalk/2026-01/msg00096.html (10,994 bytes)

226. Re: [TowerTalk] 1/4 wave vertical with counterpoise (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 17 Jan 2026 15:17:04 -0700
As a system it's the same electrically, but physically and individually I think it's a bit different.  A bent leg of a dipole has not very much distributed capacitance and a considerable distributed
/archives//html/Towertalk/2026-01/msg00097.html (10,483 bytes)

227. Re: [TowerTalk] 1/4 wave vertical with counterpoise (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 17 Jan 2026 15:30:54 -0700
K9YC said "Takeoff angle is a stupid concept.". That is hardly true.  Focusing ONLY on the gain at maximum takeoff angle may be misleading, but when comparing the same antenna at different heights or
/archives//html/Towertalk/2026-01/msg00099.html (12,248 bytes)


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