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
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