Hi, Jim.
Yes, I've previously seen your paper on the vertical dipole with the
coax sleeve. Interestingly enough, I independently came up with that
same idea many years ago, although I was never certain that I could come
up with a good enough common mode choke to make it work. Your cookbook
solves that problem.
For locations with a suitably accessible tree to hang it from, that idea
makes all the sense in the world.
And yes, I've also followed N6BT's work over the years. His vertical
dipole designs with the coiled ends are (were) amazingly effective, and
the similar quarter wave vertical (VOR) with a coiled counterpoise wire
is as well. I once modeled his VOR on 80m with what was essentially a
cage instead of a single wire in order to get more bandwidth. It looked
good on paper but I never built it.
73,
Dave AB7E
On 9/29/2022 11:28 AM, Jim Brown wrote:
David,
I've published a LOT of work on concepts like this.
This ran in National Contest Journal about six years ago. It's based
on extensive modeling, and was peer reviewed.
http://k9yc.com/AntennaPlanning.pdf
This was added to the ARRL Handbook or Antenna Book several years ago.
http://k9yc.com/VerticalDipole.pdf
This is an application of the above technique.
http://k9yc.com/80M-FDVertical.pdf
N6BT (original Force 12) has done a lot designs for monoband and
multiband verticals that are loaded dipoles. The multiband Cushcraft
R-series and Hi-Gain AV-series multiband verticals (companies bought
out by MFJ many years ago) are loaded dipoles.
73, Jim K9YC
On 9/29/2022 11:09 AM, David Gilbert wrote:
You're talking about a horizontal pair of AX1's ... I asked about
them oriented vertically. That wouldn't require them to be as high
above ground as you mention and would still allow them to be carried
pedestrian mobile.
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