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

[Dave (NK7Z)]

You might try running the same test with-- say 12 turns of cable on a 
Mix31 FT240 core, on every cable leaving the transmitter.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 9/25/22 07:06, Ron Gruner 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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to dave at nk7z.net