[Elecraft] AX1 dipole

[David Gilbert]

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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