Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w2IHRmYY018933 for ; Sun, 18 Mar 2018 18:27:49 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1exc0r-0007Ev-2I for rs_out_1@blacksheep.org; Sun, 18 Mar 2018 17:22:29 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1exc0q-0007Em-Fg for rsgb_lf_group@blacksheep.org; Sun, 18 Mar 2018 17:22:28 +0000 Received: from gmy2-mh864.smtproutes.com ([94.186.192.193]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1exc0m-0006HE-BW for rsgb_lf_group@blacksheep.org; Sun, 18 Mar 2018 17:22:27 +0000 X-Katharion-ID: 1521393727.71673.gmy2-mh864 Received: from servigilant.vigilant.es ([87.216.178.132]) by gmy2-mh864.smtproutes.com [(94.186.192.193)] with ESMTP via TCP (TLSv1/TLS_DHE_RSA_WITH_AES_256_CBC_SHA); 18 Mar 2018 17:22:07 +0000 Received: from servigilant.vigilant.local ([fe80::c40d:8140:d722:5448]) by servigilant.vigilant.local ([fe80::c40d:8140:d722:5448%13]) with mapi id 14.03.0123.003; Sun, 18 Mar 2018 18:22:01 +0100 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: EbNaut for Dummies (again) Thread-Index: AQHTvtrYutPBe9sLc0CbqT6Vljz0cw== Date: Sun, 18 Mar 2018 17:22:00 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003ABA3C369B8@servigilant.vigilant.local> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [144.178.133.117] MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi EbNaut I have been playing again with EbNaut trying to decode Stefan's transmission in 17470Hz Of course I couldn't remember all the tricks and configurations needed to setup SL and then to extract the files for the decoder, etc. Had to find the notes I used last time (and first time I decoded Stefan) Even with that I had no success decoding. May be there is my mistake or maybe there is too much noise to decode :( [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: bf14357d5ee2e4a717b88d90ab36122c Subject: LF: EbNaut for Dummies (again) Content-Type: multipart/alternative; boundary="_000_579355A36AEE9D4FA555C45D556003ABA3C369B8servigilantvigi_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE, TO_ADDRESS_EQ_REAL autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false --_000_579355A36AEE9D4FA555C45D556003ABA3C369B8servigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi EbNaut I have been playing again with EbNaut trying to decode Stefan's transmissio= n in 17470Hz Of course I couldn't remember all the tricks and configurations needed to s= etup SL and then to extract the files for the decoder, etc. Had to find the notes I used last time (and= first time I decoded Stefan) Even with that I had no success decoding. May be there is my mistake or may= be there is too much noise to decode :( Anyway I thought it would be interesting to resume it in a kind of guide to= help others to try. And at the same time use it as guide for myself in a next try. I have included links t= o Dropbox because files attached to the message will not be distributed by the reflector, at least = that happens to me SL must be configured to export FFT files. You also need the EbNaut utiliti= es from Markus, DF6NM http://df6nm.bplaced.net/VLF/fec_tests/df6nm_ebnaut_utilities.zip There is a text file "sr.txt" you need to configure according to your Spect= rumLab settings this way https://www.dropbox.com/s/l4ty8yyi2yetaep/SR%20file%20configuration%20expla= ined.bmp?dl=3D0 The File Export configuration in SL is also very important. The configurati= on shown will export the files to a \data4h folder you must create in the main \Spectrum folder were SL is= installed https://www.dropbox.com/s/j9le8em2ac89sis/File%20Export%20configuration.bmp= ?dl=3D0 The exported files must be converted to .wav files using Markus application= ebnaut_ifft3a.exe The configuration file sr.txt must be edited and must match SL settings To convert a file just drag it over the ebnaut_ifft3a aplication and drop. = It will produce another file with same name but .wav format Then start EbNaut decoder ebnaut-rx and configure all the settings accordin= g to the transmission announce. Assuming the central frequency in SL is the same as transmission = frequency there is no need to configure "Freq.offset" in EbNaut. Our main problem is timing and y= ou need to choose the right file starting just BEFORE the announced transmission and even the= n specify the exact "Start offset" in seconds I selected a file which should contain Stefan's transmission from last marc= h 16th at 23:30 utc You will see there is a shift between windows file date stamp and real file= start. Fortunately this is constant and you will be not dummy enought not to figure out which file = to choose. If not the old trial and error will do for your Select the file in the EbNaut decoder and press Run. You will get the real = File start at 23:22:41.040 Then you need to calculate and set the exact Start offset in EbNaut decode= r A clock calculator like this is a good help http://www.calculator.net/time-= calculator.html Anyway you will need to convert the result to seconds. Easy, even for a dum= my Don't forget to increase the CPU number if you are using a multi core proce= ssor. Press Run again and let the force be with you while the decoder work digging for a signal i= n that file Sure I'm missing something here. I think have read there is a 4 sample dela= y to be added to the offset time. List lenght is also important, but as a dummy I prefer not to place a= finger there at this moment Please elaborate and describe how one (dummy) can translate that to seconds There is also a lack of lower level explanations about SL here. You must be= running sample rate compensation from 1pps GPS signal, and the system timing must be accurately set. There i= s also a relation between FFT configuration and file lenght which determines how much transmission time y= ou get in a single file. Depending on announced transmission duration it should be modified to fit a complete = transmission window So, please go ahead and feel free to complete this basic instructions. And = specially ... CORRECT it ! But always keeping it simple, for us, dummies ;-) 73 de Luis EA5DOM --_000_579355A36AEE9D4FA555C45D556003ABA3C369B8servigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi EbNaut

I have been playing again with EbNaut trying to decode Stefan's transm= ission in 17470Hz

Of course I couldn't remember all the= tricks and configurations needed to setup SL and then to extract
the files for the decoder, etc. Had t= o find the notes I used last time (and first time I decoded Stefan)<= /div>
Even with that I had no success decod= ing. May be there is my mistake or maybe there is too much
noise to decode :(

Anyway I thought it would be interest= ing to resume it in a kind of guide to help others to try. And at the
same time use it as guide for myself = in a next try. I have included links to Dropbox because files
attached to the message will not be d= istributed by the reflector, at least that happens to me

SL must be configured to export FFT f= iles. You also need the EbNaut utilities from Markus, DF6NM
http://df6nm.bplaced.net/VLF/fec_tests/df6nm_ebnaut_utilities.zip

There is a text file "sr.txt&quo= t; you need to configure according to your SpectrumLab settings this way

The File Export configuration in SL i= s also very important. The configuration shown will export the files=
to a \data4h folder you must create i= n the main \Spectrum folder were SL is installed
https://www.dropbox.com/s/j9le8em2ac89sis/File%20Export%20configuratio= n.bmp?dl=3D0 

The exported files must be converted to .wav files using Markus applic= ation ebnaut_ifft3a.exe
The configuration file sr.txt must be edited and must match SL setting= s

To convert a file just drag it over the ebnaut_ifft3a aplication = and drop. It will produce another file
with same name but .wav format

Then start EbNaut decoder ebnaut-rx and configure all the setting= s according to the transmission
announce. Assuming the central frequency in SL is the same as transmis= sion frequency there is no
need to configure "Freq.offset" in EbNaut. Our main problem = is timing and you need to choose
the right file starting just BEFORE the announced transmission and eve= n then specify the exact
"Start offset" in seconds

I selected a file which should contain Stefan's transmission from last= march 16th at 23:30 utc
You will see there is a shift between windows file date stamp and real= file start. Fortunately this
is constant and you will be not dummy enought not to figure out which = file to choose. If not
the old trial and error will do for your
 
Select the file in the EbNaut decoder and press Run. You will get the = real File start at 23:22:41.040
Then  you need to calculate and set the exact Start offset in EbN= aut decoder
A clock calculator like this is a good help http://www.calculator.net/time-calculator.html
Anyway you will need to convert the result to seconds. Easy, even for = a dummy 

Don't forget to increase the CPU number if you are using a multi core = processor. Press Run again
and let the force be with you while the decoder work digging for a sig= nal in that file

Sure I'm missing something here. I think have read there is a 4 sample= delay to be added to the offset
time. List lenght is also important, but as a dummy I prefer not to pl= ace a finger there at this moment
Please elaborate and describe how one (dummy) can translate that to se= conds

There is also a lack of lower level explanations about SL here. You mu= st be running sample rate compensation
from 1pps GPS signal, and the system timing must be accurately set. Th= ere is also a relation between FFT
configuration and file lenght which determines how much transmission t= ime you get in a single file. Depending
on announced transmission duration it should be modified to fit a comp= lete transmission window

So, please go ahead and feel free to complete this basic instructions.= And specially ... CORRECT it !
But always keeping it simple, for us, dummies  ;-)

73 de Luis
EA5DOM


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