Re: LF: EbNaut decodes last night

[Alex K <rn3aus@gmail.com>]

Hello LF, Riccardo, Markus!

Some interesting decodes last night:

- easy decode DF6NM

- and decode (may be false but looks like correct) of IW4DXW (absolutely invisible on the spectrum)!

73 and HNY de rn3aus/Alex

--------------------------------------------------------------
Log file:

ebnaut-rx V0.5
input file 12310452.wav
sample rate 125.000000 per second
rx frequency 137500
file start time 2016-12-31 04:35:21.320
polynomial 8K19A
crc size 16
number of chars 8
block size 64
symbol period 2.000
number of symbols 656
list length 200000
start offset 430.604
freq offset -16.711600
cores 1
skipped 430.608000 seconds to start
initial reference phase -50.4
---------------------------------------------
found WAKU2MEC
list rank 47074
reference phase   30   30   30   30
carrier RMS 1.484e+004 noise RMS 2.466e+003
carrier S/N 15.59 dB in 762.2 uHz
carrier Es/N0 -12.58 dB
carrier Eb/N0 -1.00 dB
info bit period 28.77 seconds
symbol error rate 265/656 = 40.396 %
Es/N0 from symbol errors -15.2 dB
Eb/N0 from symbol errors -3.6 dB
Shannon capacity 139.6 bits/hour
Shannon efficiency 89.6 %
symbols file 12310452-symbols.csv
elapsed 14 seconds
---------------------------------------------
found : Y Q1 ,
list rank 12591
reference phase -120 -120 -120 -120
carrier RMS 1.530e+004 noise RMS 2.466e+003
carrier S/N 15.85 dB in 762.2 uHz
carrier Es/N0 -12.31 dB
carrier Eb/N0 -0.73 dB
info bit period 28.77 seconds
symbol error rate 254/656 = 38.720 %
Es/N0 from symbol errors -13.8 dB
Eb/N0 from symbol errors -2.2 dB
Shannon capacity 148.1 bits/hour
Shannon efficiency 84.5 %
symbols file 12310452-symbols.csv
elapsed 36 seconds
---------------------------------------------
found UD+D74A-
list rank 24669
reference phase  120  120  120  120
carrier RMS 1.552e+004 noise RMS 2.466e+003
carrier S/N 15.98 dB in 762.2 uHz
carrier Es/N0 -12.19 dB
carrier Eb/N0 -0.61 dB
info bit period 28.77 seconds
symbol error rate 245/656 = 37.348 %
Es/N0 from symbol errors -12.8 dB
Eb/N0 from symbol errors -1.2 dB
Shannon capacity 152.3 bits/hour
Shannon efficiency 82.2 %
symbols file 12310452-symbols.csv
elapsed 43 seconds
---------------------------------------------
found FBDECODE
list rank 8999
reference phase  -90  -90  -60  -60
carrier RMS 1.573e+004 noise RMS 2.466e+003
carrier S/N 16.09 dB in 762.2 uHz
carrier Es/N0 -12.08 dB
carrier Eb/N0 -0.50 dB
info bit period 28.77 seconds
symbol error rate 244/656 = 37.195 %
Es/N0 from symbol errors -12.7 dB
Eb/N0 from symbol errors -1.1 dB
Shannon capacity 156.2 bits/hour
Shannon efficiency 80.1 %
symbols file 12310452-symbols.csv
elapsed 128 seconds

2016-12-31 3:51 GMT+03:00 Riccardo Zoli <riccardozoli80@gmail.com>:

Hi Markus, Joe, Domenico, LF

Extraordinary decode results, Markus. Congratulations for DX! Very good RX setup, Joe.
Thanks for trying to discover my signal.
I'm on air again for another attempt (with a little bit more power), same parameters (2 sec, 8 char) on:
00:30z, 01:00z ÷ 07:00z (every :00)
QRG: 137485.0006 Hz

All the best

73 de IW4DXW Riccardo

Il 31/Dic/2016 01:22, "Markus Vester" <markusvester@aol.com> ha scritto:

Hi Joe,

very nice results from your SpecLab files!

I easily saw my carriers and the PSK symbols in each of the files, so there was no need to make use of the pilot. Then in 6 out of 7 files, I decoded the *OBELIX* message, and tweaked each time offset for best SNR. Knowing my transmit start time (0.2 s after the hour), I could then derive that your PC clock had been 2.1 to 2.6 seconds late. Note that this would have been impossible if the signal hadn't shown up the rawsyms plot, which is why we usually  depend on reliable timing.

Using the time and frequency information, I calculated theoretical offsets for the IW4DXW. who was transmitting 4.9994 Hz below me. Unfortunately Ric's signal wasn't quite strong enough to produce a plausible decode (perhaps due to the snow on his antenna).

EbNaut received by VO1NA on 2016 Dec 30:

VO1NA  --------DF6NM----------    ---VO1NA---  --------IW4DXW-----------
file   foffs  start  sym  carr     rx  clock     foffs    start  decode
hhmm    Hz     s      dB   dB      Hz    s         s        s

0122 -9.8955v 306.9     nil      drift  -2.1
0212 -9.8984  306.9   5.5  6.2   .1016  -2.1   -14.8978  306.7  nil, qrm
0312 -9.902   306.8  11.9 14.0   .098   -2.2   -14.9014  306.6    nil   
0412 -9.9032  306.8  11.0 12.1   .0968  -2.2   -14.9026  306.6    nil
0512 -9.9043  306.6   3.7* 7.7   .0957* -2.4   -14.9037  306.4    nil   *glitch?
0612 -9.9048  306.4  10.4 11.5   .0952  -2.6   -14.9042  306.2    nil
0712 -9.9053  306.4   8.5  9.0   .0947  -2.6   -14.9047  306.2    nil

I'd like to try a 13 character message tonight:

 137490 Hz,
 13 char, 2 s, 8k19a,
 starting each hour since 0 UT + 0.2 s,
 5 min carrier before and after.

All the best,
Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: markusvester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 30 Dez 2016 2:39 pm
Betreff: AW: LF: EbNaut decodes last night

Hi Joe,

 

the ones centered 12 minutes past the hour, ie. filenames 1230xx12.txt, please.

 

73, Markus

 

Von: jcraig@mun.ca
Gesendet: Freitag, 30. Dezember 2016 14:19
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: EbNaut decodes last night

 

Hi Markus,

 

Files 12300102, 112 122 133.txt etc are on disc.

Which ones would you like to have uploaded?

 

73

Joe

 

 

 

iw4dxw-ebnaut-rawsyms-31dec16-05z.png
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iw4dxw-ebnaut-31dec16-05z.png
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df6nm-ebnaut-rawsyms-31dec16-05z.png
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df6nm-ebnaut-31dec16-05z.png
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