To: rsgb_lf_group@blacksheep.org
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From: N1BUG <paul@n1bug.com>
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Message-ID: <34a65bdb-63b0-c9ae-bf8c-b4ea0b87581f@n1bug.com>
Date: Fri, 28 Dec 2018 09:04:14 -0500
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In-Reply-To: <1546004132195.62442@kuleuven.be>
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Subject: Re: LF: SlowJT9 update (v0.9.12.5)
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Reply-To: rsgb_lf_group@blacksheep.org

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