​Hello Andy,

SlowJT9 does use the WSJT-X decoding engine (JT9.EXE).

JT9-2, JT9-5 and JT9-10 are resampled to JT9-1 and send to the JT9 decoder.

In the resampling process frequenties are multiplied:

- by 2.222 (15360/6912) for JT9-2

- by 5.926 (40960/6912) for JT9-5

- by 12 (82944/6912) for JT9-10

The maximum frequency the JT decoder can handle is 5kHz, so for JT9-2 the Fmax is reduced to 2250Hz for JT9-2, 843Hz for JT9-5 and 416Hz for JT9-10.

The lowest frequency for the JT9 decoder is given as 200Hz, but it is my experience that is also decodes well below 200Hz, so in practice the lowest frequency will be whatever is he low audio bandwidth limit for TX and RX (I would suggest to stay above 200Hz, maybe even 300Hz).

73, Rik  ON7YD - OR7T

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Van: [email protected] <[email protected]> namens Andy TALBOT <[email protected]>
Verzonden: zaterdag 12 januari 2019 20:13
Aan: [email protected]; [email protected]
Onderwerp: Re: [rsgb-lf-group] R7NT JT9-10 beacon

 

A question about the JT9-Slow S/W

Does it decode all transmissions within a certain band, as WSJT-X does?

Or just one at a time?  In which case how far off can the tuning be?

I have my Elad FDM Duo tuned and feeding the software, Rx Freq set to 405, but no decodes as yet

Andy

www.g4jnt.com

Virus-free. www.avg.com

On Sat, 12 Jan 2019 at 18:45, Alex R7NT via Groups.Io <ru6la=[email protected]> wrote:

Dear LF enthusiasts,
My JT9-10 beacon is ON
freq abt 136405

73! Alex R7NT  136.73.ru    AWLF 136.73.ru/h_aw

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