[Elecraft] AX-1 -- with and without counterpoise

[David Gilbert]

I intend to do that.  I probably will also test the resistor with and 
without a whip ... i.e., four combinations.

I don't expect a resistor to do as well as the AX1 because the AX1 is a 
partly reactive load that doesn't absorb energy like a resistor would, 
but we don't really know how lossy the AX1 is, do we.  I just think that 
it might be an interesting comparison, and an actual measurement for the 
AX1 with and without a counterpoise most certainly would be interesting.

73,
Dave   AB7E


On 9/25/2022 2:00 PM, john at kk9a.com wrote:
> If the signal in your AX1 test is significantly stronger with the
> counterpoise it would be interesting to also compare using a resistor
> vertical with counterpoise post as you previously posted.
>
> John KK9A


> David Gilbert ab7e wrote:
>
> To be a proper comparison, the AX1 needs to be out it the clear away
> from anything else, preferable at a height that allows the counterpoise
> to be hanging straight down with the end maybe a foot or two off the
> ground.  Measurements should be with the AX1 at the same height above
> the ground without and without the counterpoise. Ideally a KX2 or
> similar rig should used, be battery powered (with very short leads if
> external), no coax, and no body contact to the source of RF.  Signal
> reports should be in microvolts ... the number of contacts isn't really
> useful and neither is SNR if the readings are taken over a lengthy
> period of time.
>
> If I can get my hands on an AX1, I plan to either climb a tree or set up
> a tall fiberglass step ladder for the AX1 as far away line of sight from
> my home as practical.  I'd use my KX2 for the signal source, using the
> Tune function to put out RF without touching the KX2.  Near my home I'd
> set up the portable vertical antenna I described in an earlier post, and
> feed that to my K3 set to read microvolts.  I'd operate the AX1 (with
> and without counterpoise wire) and any other antenna for comparison, and
> have a friend record the microvolts from the K3 as a blind test.
>
> I would use the tuner in the KX2 to simulate actual use, but that would
> of course introduce a variable for possibly different amounts of loss in
> the tuner depending upon the load.  I don't see a good way to avoid that.
>
> 73,
> Dave   AB7E
>
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