Message-ID: <157cd9f1a3e.marcocadeddu@tin.it>
Date: Sun, 16 Oct 2016 15:12:18 +0200 (CEST)
From: "marcocadeddu@tin.it" <marcocadeddu@tin.it>
To: <rsgb_lf_group@blacksheep.org>
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Subject: R: Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part1
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Markus, Stefan,

thanks a lot for the nice tutorial, but I didn't succeed :-( either is 
not enough idiotproof or there is something else..
What are the least system requirements for processing 
Ebnaut decode?
In the shack I have a tower pc running XP, the clock is 1,99 Ghz with 
456Mb RAM; I downloaded Ebnaut 5.0 and the audio file you provided and 
after following the guide (some time later..) I got the message "not 
enough memory to run the decoding" and indeed although the computing 
resources were not under pressure (4%) I seen that a 1Gb swap file was 
running so the answer should be add RAM.
I have also a netbook running w10  clock 1,7GHz with 1GB RAM: I tried 
here but...
I'm unable to set thw Ebnaut window size and therefore the RUN button 
is not visible, the desktop size /resolution cannot be changed so in 
order to see the full Ebnaut window I have to switch in the vertical 
mode (of course in this case I see all but the mouse command are still 
the same so when I move in vertical the mouse the cursor move 
horizzontal...). Anyway finally everithing was set and pushed the RUN 
button.
The initialsation message was displayed but after 15 minutes all was 
blocked with no sign of computing..

Did I miss something else?

Thanks for any feedback

73 Marco IK1HSS
----Messaggio originale----
Da: markusvester@aol.com
Data: 15-ott-2016 18.25
A: <rsgb_lf_group@blacksheep.org>
Ogg: Re: LF: Idiot&#39;s guide to receiving Ebnaut? - Tutorial part1

Hi Tony, 

downloading from the Dropbox link appeared to work fine here. Anyway 
I've temporarily ftp-ed Stefan's file to http://df6nm.bplaced.net/VLF/fec_tests/10111913.wav
, hope that might help out. 

One minor note: Riccardo's transmission 
was announced and sent 0.6 milliHz above nominal. Entering a frequency 
offset of -14.9994 instead of -15 Hz produced a stronger and quicker 
decode.

All the best,
Markus 


-----Ursprüngliche Mitteilung----- 
Von: Tony Baldwin <ei8jk@topmail.ie>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 15 Okt 2016 5:58 pm
Betreff: Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part1


Stefan
 I can't seem to download the dropbox files, it just opens to a video 
playback.
 Tony


On 15/10/2016 11:58, DK7FC wrote:


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