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Re: Re: LF: SlowJT9 v0.9.02

To: "[email protected]" <[email protected]>
Subject: Re: Re: LF: SlowJT9 v0.9.02
From: Rik Strobbe <[email protected]>
Date: Mon, 12 Nov 2018 21:59:17 +0000
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Thread-topic: Re: LF: SlowJT9 v0.9.02

Hi Mauro,


the link is still the same:http://472khz.org/SlowJT9/SlowJT9_setup.exe


73, Rik  ON7YD - OR7T



Van: [email protected] <[email protected]> namens Mauro Giroletti <[email protected]>
Verzonden: maandag 12 november 2018 22:52
Aan: [email protected]
Onderwerp: R: Re: LF: SlowJT9 v0.9.02
 
Hi ,
i'm sorry link for download SlowJT9 v0.9.02
Thanks
Mauro
I2-1510 -Ik2 GFT


----Messaggio originale----
Da: [email protected]
Data: 12-nov-2018 22.00
A: "[email protected]"<[email protected]>
Ogg: Re: LF: SlowJT9 v0.9.02


Hello Eric, all,

arecord -c 1 -r 12000 -f S16_LE capture.wav
sox capture.wav capture_tmp.wav speed 2.0
jt9 -9 -d 3 -S 300 capture_tmp.wav
cat decoded.txt

That is amost exactly what I am doing in SlowJT9, just in a more fancy (user friendly) way ;-)
Does the speeding-up includes averaging ?

73, Rik  ON7YD - OR7T

________________________________________
Van: [email protected] <[email protected]> namens Eric NO3M <[email protected]>
Verzonden: maandag 12 november 2018 21:42
Aan: [email protected]
Onderwerp: Re: LF: SlowJT9 v0.9.02

Paul, et.al.

Correct, the original timings were fit into a "window" vs. simple
scaling.  Since the slowJT exe wouldn't run in WINE, I just ran a few
commands to decode K5DNL:

arecord -c 1 -r 12000 -f S16_LE capture.wav
sox capture.wav capture_tmp.wav speed 2.0
jt9 -9 -d 3 -S 300 capture_tmp.wav
cat decoded.txt

decoded.txt:
0000   1  -26   0.1   2400.   1   VVV DE K5DNL           JT9

jt9 is the standard executable decoder from WSJTX v1.9.1.

73 Eric NO3M

On 11/12/18 3:12 PM, N1BUG wrote:
> Eric brings up a good point. Forget what I said the other day about
> beaconing with a U3S to be received by SlowJT9. I believe that won't
> work because the U3S uses the original JT9-2, -5, -10, -30 symbol
> lengths which are different.
>
> Probably (a guess) in the original, symbol lengths were chosen to
> fill as much of the period as possible while leaving enough time at
> the end for decoding. I would further guess there were specific
> decoders for each submode, or one decoder whose parameters could be
> modified for the current submode.
>
> 73,
> Paul N1BUG
>
>
> On 11/12/18 2:47 PM, Rik Strobbe wrote:
>> Hello Eric,
>>
>>
>> yes, a scale factor of 2 and 5 is used.
>>
>> I hadn't any information about the old JT9-2 and JT9-5 modes and
>> those scale factors seemed the most straightforward to me and
>> make the conversion to JT9 easy.
>>
>>
>> 73, Rik  ON7YD - OR7T
>>
>>
>>
>>




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