From: Rik Strobbe <rik.strobbe@kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: SlowJT9 update (v0.9.12.5)
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Date: Fri, 28 Dec 2018 14:21:53 +0000
Message-ID: <1546006828762.47803@kuleuven.be>
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Subject: Re: LF: SlowJT9 update (v0.9.12.5)
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Hello Paul, all,

about the JT9 decoder sensitivity: so far it is only an impression that it degrades at higher frequencies. I will have to do some more testing to confirm or deny it.
But I won't hurt to go to 640Hz audio or so ...
I just switched from 136.8kHz dial tot 136.55kHz, so Stefan's signal should jump up from 580Hz to 830Hz audio. Let's see what that gives.

Lowering the bottom frequency limit to 300Hz can be done.
I will adapt the spectrogram speed to the selected JT9 submode.
Implementing JT9-10 is my next target, I hope it will go smoother that implemneting JT9-5 (I grew gay hair with that, but will tell the story in a separate mail).

73, Rik  ON7YD - OR7T

________________________________________
Van: owner-rsgb_lf_group@blacksheep.org <owner-rsgb_lf_group@blacksheep.org> namens N1BUG <paul@n1bug.com>
Verzonden: vrijdag 28 december 2018 15:04
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: SlowJT9 update (v0.9.12.5)

Hello Rik,

I will change my frequency to go below 640 Hz for the next tests of
JT9-5.

In anticipation that JT9-10 may have a similar reduction in
sensitivity at the high end, and to give us a bit more room to play,
would it be possible to extend the low end down to 300 Hz? Many rigs
can easily go down there.

I agree slowing down the spectrogram to match the mode is
desirable.

73,
Paul


On 12/28/18 8:35 AM, Rik Strobbe wrote:
> Hello Stefan,
>
>
> I switched to 136.8kHz dial:
>
> 1215  -9 -0.6  580 5  CQ DK7FC JN49 1225  -4 -0.4  580 5  CQ
> DK7FC JN49    ​
>
> About the audio frequency limit for JT9-5: this is injherent on
> the decoding technique I am using. The JT9-5 signal is resampled
> (speeded up) to a JT9-1 signal and then decoded by the JT9
> decoder of the WSJT suite. The resampling rate between JT9-5 and
> JT9-1 is 40960/6912 = +/- 5.926. In the resampling the
> frequencies are shifted up by this factor (so a 500Hz audio tone
> at JT9-5 becomes 2963Hz at JT9-1. The upper frequency limit of
> the JT9 decoder is 5000Hz, that means 5000/5.926 = 843.75 Hz for
> the JT9-5 signal. By the way: I have done some testing and have
> the impression that the sensitivity of the JT9-5 decoder
> decreases above 3800kHz. So for optimal result (at RX end) I
> would recommend to stay below 640Hz audio.
>
> However, it would be possible to allow transmission above 843 Hz.
> If that would be of any help to you I will incorporate it in the
> next version.
>
> Slowing down the spectogram: I will add it to the wish list.
>
> 73, Rik  ON7YD - OR7T
>
>
>
>
> ________________________________ Van:
> owner-rsgb_lf_group@blacksheep.org
> <owner-rsgb_lf_group@blacksheep.org> namens DK7FC
> <selberdenken@posteo.de> Verzonden: vrijdag 28 december 2018
> 13:04 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF:
> SlowJT9 update (v0.9.12.5)
>
> LF,
>
> I am now TXing JT9-5 on 137.38 kHz. Is there someone who yould
> give me a report?
>
> It is good to see that the program did not crash yet on my PC.
> This is an improvement. Even the transmisions seem to work now,
> so far.
>
> Unfortunately the program does still not support TX frequencies
> above 843 Hz in the JT9-5 mode. So i need to change the (not
> existing 'dial') frequency by adding another 600 Hz to SpecLabs
> upconverter. Actually i need 12380 Hz to steer my LF hardware to
> transmit on the desired frequency. It would be nice if a next
> version could support all frequencies up to 24 kHz, so the
> software becomes more flexible for OMs using their homemade
> upconverters, rather than a HF TRX with their microphone inputs
> and SSB frequency ranges. One more feedback: It would be nice if
> the spectrogram would scroll slower for the slower modes, and
> just displays time markers in one TX/RX interval, i.e. here: 5
> minutes.
>
> 73, Stefan
>
>
>
>
> Am 28.12.2018 12:15, schrieb DK7FC: Hello Rik, LF,
>
> Congrats to the latest version! I'm going to install it now and
> hope it will work well here too. What about the JT9-10 mode? It
> could be very helpful on 2200m these days.
>
> My VLF TX was running for 3 days without a single interruption.
> Now i stopped it and do QSY to 137 kHz. It means that i can
> receive again there and hope to see some messages into the
> monitor field. Also i plan to transmit, if all works well.
> Looking forward to a QSO.
>
> 73, Stefan
>
>
> Am 26.12.2018 21:11, schrieb Rik Strobbe:
>
> ​​Dear all,
>
>
> I finally found the time to implement JT9-5 and just uploaded
> v0.9.12.5.
>
> Be ware that this is a ZIP file that only contains the
> SlowJT9.exe. In order to use it you need to install version
> 0.9.12.4 (if not already done) and replace the v0.9.14.4
> SlowJT9.exe by the one in the ZIP file.
>
> The JT9-5 mode was just briefly tested but seems to decode fine
> at -33dB.
>
> All reports on JT9-5 tests are welcome, as well as any bug
> report, remark or suggestion.
>
>
> 73, Rik  ON7YD - OR7T
>
>
>
> ________________________________ Van: Rik Strobbe Verzonden:
> vrijdag 14 december 2018 23:25 Aan:
> rsgb_lf_group@blacksheep.org<mailto:rsgb_lf_group@blacksheep.org>;
> rsgb_lf_group@yahoogroups.co.uk<mailto:rsgb_lf_group@yahoogroups.co.uk>;
> 600MRG@mailman.qth.net<mailto:600MRG@mailman.qth.net>;
> rsgb-lf-group@groups.io<mailto:rsgb-lf-group@groups.io>
> Onderwerp: SlowJT9 update (v0.9.12.4)
>
>
> Dear all,
>
>
>
> Beta-release v0.9.12.4 of SlowJT9 has been uploaded, see
> http://www.472khz.org/SlowJT9/.
>
>
> Changes:
>
> - A bug fixed that sometimes caused the application to crash at
> the end of a transmission.
>
> - Ability to select double or quadruple tone tone spacing
> (Settings->Mode)
>
> - Ability to display the own transmission in the RX frequency
> window (Settings->Mode).
>
>
> I got very few bug reports from the previous version (0.9.12.3),
> so either SlowJT9 is running quit stable or people are getting
> tired of sending me bug reports ;-)
>
>
> Bug reports, remarks and suggestions are still welcome.
>
>
> 73, Rik  ON7YD - OR7T
>
>
> ________________________________ Van: Rik Strobbe Verzonden:
> woensdag 12 december 2018 17:16 Aan:
> rsgb_lf_group@blacksheep.org<mailto:rsgb_lf_group@blacksheep.org>;
> rsgb_lf_group@yahoogroups.co.uk<mailto:rsgb_lf_group@yahoogroups.co.uk>;
> 600MRG@mailman.qth.net<mailto:600MRG@mailman.qth.net>;
> rsgb-lf-group@groups.io<mailto:rsgb-lf-group@groups.io>
> Onderwerp: SlowJT9 update (v0.9.12.3)
>
>
> ​Dear all,
>
>
> I just uploaded a new beta-release of SlowJT9 (v0.9.12.3).
>
> The reporting to debug.txt is been extended (in particular during
> TX).
>
> I also fixed a array bound violation that caused crashes once in
> a while.
>
> JT9-5 and JT9-10 modes are temporarily disabled, my first goal is
> to have a stable version before tackling new features.
>
>
> Be aware that due to the baudrate changes there is NO BACKWARD
> COMPATIBILITY for JT9-2 and JT9-5 to version prior to 0.9.10.
>
> In other words: JT9-2 and JT9-5 send with v0.9.11 cannot be
> decoded with versions v0.9.00 - v0.9.03 and vice versa.
>
> The JT9-1 mode however is still the same and can be sent /
> received with all versions (and is WSJT-X compatible).
>
>
> The purpose of this version is to determine the stability of the
> application.
>
> Therefore all test reports, remarks, suggestions and opinions are
> most welcome.
>
>
> I want to thank everybody who gave feedback, suggestions and bug
> reports over the past weeks, this was very much appreciated! In
> particular Markus, DF6NM, for his patience in explaining me how
> to implement windowed sinc interpollation for the resampling.
>
>
> Whoever is interested can download the SlowJT9 version 0.9.12.3
> installation file at
> http://472khz.org/SlowJT9/<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.
>
> 73, Rik  ON7YD - OR7T