LF: Fwd: Decoding EbNaut

[Markus Vester <markusvester@aol.com>]

-----Ursprüngliche Mitteilung-----
Von: gw0ezy <gw0ezy@sky.com>
An: Markus Vester <markusvester@aol.com>
Verschickt: Mo, 2 Jan 2017 1:16 pm
Betreff: Re: Decoding EbNaut

Hi Markus

Thanks - very good news!

I'll make the changes to the opds cleanup.bat and start saving for EbNaut decodes.

No problem with posting my questions to the group and I'm sure others are using the FDM-DUO so will get more EbNaut monitors active.

73 Terry G0EZY

On Monday, 2 January 2017, 10:37, Markus Vester <markusvester@aol.com> wrote:
 

Hi Terry,

wishing all the best for 2017 to you as well!

Joe's example files are available on his website: http://www.ucs.mun.ca/~jcraig/ebnaut/

Yes these are the same files which are used for opds. To keep them, you only have to remove or circumvent the auto-delete command in cleanup.bat. However the \data directory shouldn't grow very large because opds periodically scans it for new entries. My cleanup.bat has an extra line to copy the files to a separate "\saved" subdirectory before deletion:

@copy headline.txt + detected.txt + detecold.txt c:\dropbox\public\opds32.txt >nul
@copy c:\spectrum\data\*.txt c:\spectrum\data\saved\*.txt 1>nul 2>nul
@del c:\spectrum\data\*.txt 1>nul 2>nul
@copy dirw.txt dirdone.txt >nul

It is helpful but not absolutely necessary to use GPS lock for the audio. The audio frequency is low enough (typically 1.5 kHz) that sub-ppm samplerate deviations have relatively little effect. Alternatively, you could also use an injected audio carrier (e.g. 5.000 kHz) for SpecLab's samplerate corrector. For the purpose of file timestamping, controlling the PC clock with NTP is sufficient.

I believe that your questions may also be relevant to others, so if it's ok with you I'd suggest posting this to the LF group.

All the best,
Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: gw0ezy <gw0ezy@sky.com>
An: markusvester <markusvester@aol.com>
Verschickt: Mo, 2 Jan 2017 9:01 am
Betreff: Decoding EbNaut

Happy New Year Markus

Thank you for the detailed instructions to Jo & all for decoding the EbNaut text files.

Please could you send me a copy of the text files you used in the examples so I can follow the instructions exactly?

Also, I have missed a step - what is the source of the text files. Are these the same as the exported text files from your opds program?
I have opds running 24/7 but atm the clean-up program is deleting the old txt files. However I also have another SpecLab running with the EbNaut usr producing WAV files.

Probably my system isn't yet ready to decode EbNaut. I am using an FDM-Duo with GPSDO input so the LO should be stable enough but I'm not sure if the audio stream is GPS locked. So more work to do!

73 and many thanks for all the help and encouragement you are giving to the small group of LFers

Terry G0EZY