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

[Julia Tuttle]

How long is the power cable? Is it possible it's using that as a
counterpoise?

On Sun, Sep 25, 2022, 10:07 Ron Gruner <ron at gruner.com> wrote:

> I've just run two tests of my WSPR/AX-1 set-up with and without a
> counterpoise. Each test ran 24 hours over the last couple of days. Here are
> the results:
>
>                                                     COUNTERPOISE?
>                               YES       NO
>                           -------  -------
> Total Contacts                152      129
> Maximum Distance (km)      15,720   17,276
> Median Distance             2,137    1,823
> Median SpotQ                  446      398
>
> Where SpotQ = Kilometers / [(2 Watts x (SNR in DB + 36))/36) ]
>
> The WSPR circuit's ground and SMA connectors are apparently providing
> enough of a counterpoise to propagate a respectable signal.
>
> Here's a close-up of the rig with no counterpoise:
> https://gruner.com/k4rhg/wspr_ax-1_nocounterpoise.png
>
> 73,
> Ron Gruner
> K4RHG
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