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LF: SlowJT9 update

To: "[email protected]" <[email protected]>, "[email protected]" <[email protected]>, "[email protected]" <[email protected]>
Subject: LF: SlowJT9 update
From: Rik Strobbe <[email protected]>
Date: Fri, 16 Nov 2018 09:55:44 +0000
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Thread-topic: SlowJT9 update

Dear all,


I just uploaded a now beta-release of SlowJT9 (v0.9.03).

The main changes are

- The option to save all decoded messages in a text file (file "decoded.txt" in the folder "extra")

- The option to save a number of actions the application goes through in a text file (file "debug.txt" in the folder "extra"). 

I hope this last will be useful to trace down bugs. So if you are encountering problems, please run SlowJT9 with "Save debug information" enabled until the problem occurs and include (the relevant part of) debug.txt in your bug report.


This weekend and maybe also next week (time permitting) I will have a closer look at

- switch to the original symbol length of JT9-2 and JT9-5

- the possibility of simultaneous decoding of JT9(-1), JT9-2  and JT9-5.

As simultaneous decoding might be a time critical event, in particular in combination with switching to the original JT9-2 and JT9-5 parameters, the debug file will include all decoding events, including the time it takes:


18-11-16 10:25:51 : decoding started
18-11-16 10:25:51 : decoding ended (0.596 s - 4 msg decoded)


In order to have an idea how much time decoding takes (on different computers, different OS) I would appreciate it if you could run SlowJT9 for some hours (overnight) in JT9-1 mode with "Save debug information" enabled and provide me with the decoding time information (in particular the "decoding ended" lines of debug.txt).


Whoever is interested can download the SlowJT9 installation file at http://472khz.org/SlowJT9/SlowJT9_setup.exe.


For now only a Windows version of SlowJT9 is available. But as the used IDE has cross platform facilities it should be possible to support other operating systems as well in the future.

The aim of this beta version is:
- To test if the application is working properly.
- To find out if JT9-2 and/or JT9-5 have a sufficient S/N advantage over JT9(-1).
- To find out if there is sufficient interest in using these modes to continue the project.
Therefore all comments, bug reports and suggestions are most welcome via the Blacksheep RSGB LF Reflector, Yahoo RSGB LF Group or directly at [email protected].

73, Rik  ON7YD - OR7T






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