LF: Re: [rsgb-lf-group] 137kHz Transatlantic QSO

[Rik Strobbe <rik.strobbe@kuleuven.be>]

Hello David,

congrats on the TA QSO and I am happy that SlowJT9 was helpful.

The advantage of multiple deconding will be under marginal conditions (SNR of -26dB or less), although occasionnaly up to -20dB a non zero DT decode might pop up.

The decoded signals can be found in the file "decoded.txt" in the subfolder "extra" (relative to the folder where you installed SlowJT9).

I would appreciate it if you could wend me the file as it will help me to figure out how multiple decoding behaves in the "real world", what might be useful for further improvement of SlowJT9.

73, Rik  ON7YD - OR7T

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Van: rsgb-lf-group@groups.io <rsgb-lf-group@groups.io> namens David Bowman <davidg0mrf@gmail.com>
Verzonden: donderdag 7 maart 2019 2:08
Aan: rsgb-lf-group@groups.io; rsgb_lf_group@blacksheep.org
Onderwerp: [rsgb-lf-group] 137kHz Transatlantic QSO

 

I was very pleased this evening 06/March/19 to complete a JT9-1 QSO with Paul N1BUG on 137kHz.

Paul and I have been trying almost nightly for the past 3 weeks overcoming many problems along the way.

Finally we succeeded, with reports of -21 for me, while N1BUG was -27 in IO91FR (4842km)

I should also like to say thanks to Rik ON7YD.  A few days ago I downloaded SlowJT9 v0.9.16.0.  I ran this, with "multiple decodes" switched on and had WSJT-X running parallel.
During the 12 minute QSO, SlowJT9 decoded 5 sequences from Paul at -27 while WSJT-X missed 2 of the 5. Both programmes reported the same signal levels. Audio for transmit was taken from WSJT.
- Rik. I have saved the decoded files as you requested. when I find out where they are, I will forward them to you.

Since making a crossband TA QSO (137k to 14MHz) in Sept 2000, a 2-way QSO has been a long term ambition. This is one ticked off the bucket list. Thanks Paul for the dedication and perseverance.

73

David  G0MRF

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