Return-Path: X-Spam-DCC: paranoid 104; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_30_40,HTML_MESSAGE,RATWARE_GECKO_BUILD,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u9FB3iIW009998 for ; Sat, 15 Oct 2016 13:03:44 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bvMfv-0005YI-Ot for rs_out_1@blacksheep.org; Sat, 15 Oct 2016 11:58:47 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bvMfv-0005Y8-CX for rsgb_lf_group@blacksheep.org; Sat, 15 Oct 2016 11:58:47 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1bvMft-0004UG-Jb for rsgb_lf_group@blacksheep.org; Sat, 15 Oct 2016 11:58:46 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 29AFF209EB for ; Sat, 15 Oct 2016 12:58:43 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3sx1fp6vgfzypD for ; Sat, 15 Oct 2016 12:58:42 +0200 (CEST) Message-ID: <58020BE2.1020107@posteo.de> Date: Sat, 15 Oct 2016 12:58:42 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: "rsgb_lf_group@blacksheep.org" References: <157b3bf43d2-111e-bfa3@webprd-a11.mail.aol.com> <0f1b59cf-e10d-1daf-125b-ad4aca471a06@gmail.com> <580205DC.80508@posteo.de> In-Reply-To: <580205DC.80508@posteo.de> X-Scan-Signature: 64bc660a83b79b15f4c44d2b2147e02d Subject: Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part1 Content-Type: multipart/alternative; boundary="------------080107020203090602010101" 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 X-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Content-Length: 7710 Status: O X-Status: X-Keywords: X-UID: 9090 This is a multi-part message in MIME format. --------------080107020203090602010101 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi all, There must be some progress. I thought it could be useful to lern how to participate in EbNaut detections by doing 2 exercises. 1: Generating wav files that contain the message 2: Configure the EbNaut decoder to read the wav file successfully. *Step 2 can be done today.* First you need to download the decoder software at http://abelian.org/ebnaut/ Then you need a wav-file containing a message. For this tutorial, you can have a wav file that was generated on my PC. It contains even 2 messages (rare!). Download the file from: https://dl.dropboxusercontent.com/u/19882028/LF/10111913.wav To decode a EbNaut message you have to know the start time, the symbol length, the number of characters and the Coding. These informations are given by the TX stn. Info for message 1: > Am 11.10.2016 19:04, schrieb IZ7SLZ: >> Hello LF, >> Riccardo *IW4DXW *informs that he also will be QRV EbNaut tonight on >> *137485.0006* Hz >> Message contains *31 *characters transmitted at *0.5* s/sym, coding >> *8K19A*, duration 14'40'' each hour starting 19.00Z till 23.00Z . >> >> GL. >> 73, Domenico iz7slz My file contains the 19:00 UTC transmission. Info for message 2: >>>> Hello Group, >>>> >>>> considering the Stefan's request, i'm pleased to test again EbNaut >>>> today on LF with a *51 *characters message, *8K19A *code, *0.5* >>>> s/symbol, duration 22' 40''. >>>> QRG = *137495.000* Hz >>>> >>>> Scheduled UT: *at hour*, starting from *19.00* 'till *01.00* of >>>> 12-10-2016 (included). Carrier will be "on" 5 minutes before the >>>> transmissions. Now use the EbNaut decoder and select the wav file. For the first message you can choose 31 characters, and 0.5 for the symbol period. Then press start, just for a few seconds, then stop again. You will now see some more informations: The RX freqency and the file start time. Now you can select the frequency offset, which is -15 Hz. Type that into the field. The next thing is the timing offset. The start time is *18:54:22.340* and the message started *19:00:00*. You need to know the timing offset precisely! If you don't get a decode, it is worth to vary the time offset a bit. A timing offset could of course also come from the TX stn, sometimes unknown. SpecLab causes a time offset of 4 samples. You can also see the samplerate 117.19/sec. So the timing offset is: (4S)/(117.19S/sec)+0.66sec+37sec+300sec = 337.69 seconds. Type that into the start offset field. Now you can start the decoder and should get a decode quite quickly, depending on your PC power. By changing just the number of characters and the frequency offset, you should receive the other message. Fine, that was part 1 :-) I need to get a feedback now if YOU got a successful decode or if there are problems. Depending on that feedback i would then continue with part 2. Can someone of the 'newcomers' decode both messages? 73, Stefan --------------080107020203090602010101 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi all,

There must be some progress.
I thought it could be useful to lern how to participate in EbNaut detections by doing 2 exercises.
1: Generating wav files that contain the message
2: Configure the EbNaut decoder to read the wav file successfully.

Step 2 can be done today.
First you need to download the decoder software at http://abelian.org/ebnaut/
Then you need a wav-file containing a message. For this tutorial, you can have a wav file that was generated on my PC. It contains even 2 messages (rare!).
Download the file from: https://dl.dropboxusercontent.com/u/19882028/LF/10111913.wav
To decode a EbNaut message you have to know the start time, the symbol length, the number of characters and the Coding. These informations are given by the TX stn.
Info for message 1:
Am 11.10.2016 19:04, schrieb IZ7SLZ:
Hello LF,
Riccardo IW4DXW informs that he also will be QRV EbNaut tonight on 137485.0006 Hz
Message contains 31 characters transmitted at 0.5 s/sym, coding 8K19A, duration 14'40'' each hour starting 19.00Z  till 23.00Z .

GL.
73, Domenico iz7slz

My file contains the 19:00 UTC transmission.
Info for message 2:

Hello Group,

considering the Stefan's request, i'm pleased to test again EbNaut today on LF with a 51 characters message, 8K19A code, 0.5 s/symbol, duration 22' 40''.
QRG = 137495.000 Hz

Scheduled UT: at hour, starting from 19.00 'till 01.00 of 12-10-2016 (included). Carrier will be "on"  5 minutes before the transmissions.

Now use the EbNaut decoder and select the wav file. For the first message you can choose 31 characters, and 0.5 for the symbol period. Then press start, just for a few seconds, then stop again. You will now see some more informations: The RX freqency and the file start time. Now you can select the frequency offset, which is -15 Hz. Type that into the field.
The next thing is the timing offset. The start time is 18:54:22.340 and the message started 19:00:00. You need to know the timing offset precisely! If you don't get a decode, it is worth to vary the time offset a bit. A timing offset could of course also come from the TX stn, sometimes unknown. SpecLab causes a time offset of 4 samples. You can also see the samplerate 117.19/sec. So the timing offset is: (4S)/(117.19S/sec)+0.66sec+37sec+300sec = 337.69 seconds. Type that into the start offset field.
Now you can start the decoder and should get a decode quite quickly, depending on your PC power.

By changing just the number of characters and the frequency offset, you should receive the other message.

Fine, that was part 1 :-)
I need to get a feedback now if YOU got a successful decode or if there are problems. Depending on that feedback i would then continue with part 2.
Can someone of the 'newcomers' decode both messages?

73, Stefan


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