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

[Jim Brown]

On 9/25/2022 1:43 PM, Bill Mader wrote:
> Putting the results in a spreadsheet quickly makes antenna configurations'
> difference apparent.  I have done something similar using the RBN, two
> antennas, and two nearby frequencies on the same band.  This method
> effectively identified which antenna was preferred in different directions
> and distances.  Even so, the differences could change briefly at any time
> so being able to switch antennas instantly was extremely helpful.

I've done that for two 160M antennas, one of which had a couple of dB of 
directivity. I used my call on one, a club call on the other. 
Transmitted TEST K9YC on CW 5-6 times for each call, paused 5 min, QSYed 
both a bit, repeated 10-12 times. Did this 6-8 nights, had spreadsheet 
rows for each station that heard me, separate row for each antenna. The 
test provided excellent data.

W6GJB did something quite similar comparing a top and bottom loaded 
vertical we'd built for CQP/7QP expeditions with an inverted V on 80M. 
It also yielded good data. It's shown on a few slides in this talk we 
did at the Pacificon antenna forum. We've since abandoned the concept 
after later trying a half dozen or so iterations of the design because 
it's not mechanically practical for the intended portable use.
http://k9yc.com/80M-FDVertical.pdf

73, Jim K9YC