MFSK-14 (used 12) Br 10, Sh 40

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I-56578
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Registrado: 06 May 2015 19:28

MFSK-14 (used 12) Br 10, Sh 40

Mensaje por I-56578 » 10 May 2015 14:15

This sample has been recordered on 9 May around 0640z on 13369.0 (cF) USB 9243.0 KHz USB, unfortunately I went on this frequency just at the end of the transmission, so I could not record all the initial/preamble part.
The signal spreads on a ~600 Hz bandwidth, each tone is 100 msec length. Manipulation speed is 10 Hz. The traffic sent by this system seems consist of 5 figure groups and 1 space character tone. Looking at the grid, the signal shows 14 tones, spaced by 40 Hz, with two empty spaces so the used tones are reduced to 12: the lower tone used for the space chars and the other 11 tones for coding the five figures groups (55 combinations).
Any idea?
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Rapidbit
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Re: MFSK-14 (used 12) Br 10, Sh 40

Mensaje por Rapidbit » 10 May 2015 18:28

Hi, can you upload the audio file?
Best regards.
EA4GPX, EA4022SWL, AMSAT-EA 423.

I-56578
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Registrado: 06 May 2015 19:28

Re: MFSK-14 (used 12) Br 10, Sh 40

Mensaje por I-56578 » 10 May 2015 19:56

I apologize, you are right:
https://www.dropbox.com/s/n1fikfmz8wgmf ... z.wav?dl=0

possibly XPA 10 baud?

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ANgazu
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Re: MFSK-14 (used 12) Br 10, Sh 40

Mensaje por ANgazu » 10 May 2015 20:42

Hola.

You are rigth.

It is XPA 10 b.
Just shift the signal 500 Hz downwards ( center should be about 1000 Hz) and you can decode it using Rivet
( http://apul64.dsl.pipex.com/enigma2000/rivet/index.html)

Saludos cordiales.
ANgazu.
EA4021SWL aka ANgazu

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Rapidbit
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Re: MFSK-14 (used 12) Br 10, Sh 40

Mensaje por Rapidbit » 10 May 2015 21:25

I-56578 escribió:I apologize, you are right:
https://www.dropbox.com/s/n1fikfmz8wgmf ... z.wav?dl=0

possibly XPA 10 baud?
Tks, I think so, XPA.
Greetings
EA4GPX, EA4022SWL, AMSAT-EA 423.

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