Date: Wed, 3 Oct 2018 12:46:41 +0000 (UTC)
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
Message-ID: <1959890282.3438846.1538570801742@mail.yahoo.com>
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Subject: LF: EbNaut Autodecoder 137490 Hz
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After some playing around, we are=C2=A0running an experimental EbNaut autod=
ecoder at DL0AO and DF6NM=C2=A0under=C2=A0Windows. Receive parameters are c=
urrently
=C2=A0137490.000 Hz, 6 char, 3 s, 8K19A crc 16, start hh:00 and hh:30
and preliminary results can be found=C2=A0here (scroll to bottom):
DL0AO: https://vlf.u01.de/LF/LFgrabber/ebnautresults.txt
DF6NM: https://vlf.u01.de/LF/LFgrabber/ebnautresults.txt

This is nowhere near as perfect as Domenico's Linux solution, and our softw=
are contraption is=C2=A0nowhere=C2=A0near a stable state.=C2=A0Anyhow a=C2=
=A0few test transmissions=C2=A0with=C2=A0a couple of microwatts radiated po=
wer lead to useful decodes, and a trace also appeared in the opds spectrogr=
am at DK7FC.=C2=A0It would be nice to=C2=A0find some more signals later...

Best 73,
Markus (DF6NM)

-----Urspr=C3=BCngliche Mitteilung-----=20
Von: Domenico IZ7SLZ <iz7slz.domenico@gmail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Di, 2. Okt 2018 1:18
Betreff: Re: LF: 2200M EbNaut Beacon

LF EbNauters,

thanks to Markus and Stefan for the comments and to Rob for putting on air =
a very good signal.=20
I was also surprised to see the decode achieved by the auto-decoder without=
 any time and frequency offset !Propagation conditions are becoming better,=
 but noise here is still high.I tried a deep investigation: no further deco=
de,=C2=A0 but with an offset of -0.0001 Hz and=C2=A0+0.005s (ooops !) i hav=
e improved the 2018-09-30_03:00 UT decode:
initial reference phase -62.3 amplitude 2.049e-01
phase=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=
=A0 0=C2=A0=C2=A0=C2=A0 0
carrier phase: -6.9 deg
carrier Eb/N0: 0.5 dB
carrier Es/N0: -10.10 dB
carrier S/N: 19.87 dB in 672.0 uHz, -11.86 dB in 1Hz, -45.84 dB in 2.5kHz
elapsed 58
found rank 43 ber 3.4980e-01 Eb/N0 -0.6 M -7.389708042e+00 ph 0 0,0,0,0 [K3=
RWR_FM18QI_73]

Looking on the October 1st recordings, with these offsets,=C2=A0 i got anot=
her decode at 02:30 UT:
initial reference phase -6.6 amplitude 2.356e-01
phase=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=
=A0 0=C2=A0=C2=A0=C2=A0 0
carrier phase: -1.2 deg
carrier Eb/N0: 0.4 dB
carrier Es/N0: -10.23 dB
carrier S/N: 19.74 dB in 672.0 uHz, -11.99 dB in 1Hz, -45.97 dB in 2.5kHz
elapsed 58
found rank 84 ber 3.6694e-01 Eb/N0 -1.7 M -7.504411221e+00 ph 0 0,0,0,0 [K3=
RWR_FM18QI_73]

QRB=C2=A0 is about 7600 km.
Working conditions here, (vintage =F0=9F=98=80) as usual:- miniwhip (a modi=
fied ex-Navtex antenna from Furuno ; see attachment)- receiver JRC NRD-92M =
with external 10 MHz reference signal steered by=C2=A0 GPS- a modest PC (In=
tel P4 CPU 3.50GHz x2) from scrap with Ubuntu 14.04LTS
- software vlfrx-tool from Paul Nicholson.
I have attached also the latest version of=C2=A0 the bash './autoebnaut' i.=
e. the list of the commands that recall vlfrx-tool programs to start the de=
coder each 30 minutes.Other linux programs are running in background:- vtca=
rd and vttime to manage and calibrate the audio card- vtwrite to store audi=
o coming from receiver- gpsd and chrony to manage the nmea and 1pps from ne=
o8 gps (connected at serial COM1) and adjusting the PC clock.

73, Domenico IZ7SLZ=20


=C2=A0
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<div style=3D"font-size:10pt;font-family:arial,helvetica,sans-serif;color:b=
lack;"><div id=3D"yiv1668961256"><div style=3D"color: black; font-family: a=
rial, helvetica, sans-serif; font-size: 10pt;"><div style=3D"color: black; =
font-family: arial, helvetica, sans-serif; font-size: 10pt;">After some pla=
ying around, we are&nbsp;running an experimental EbNaut autodecoder at DL0A=
O and DF6NM&nbsp;under&nbsp;Windows. Receive parameters are currently<br>&n=
bsp;137490.000 Hz, 6 char, 3 s, 8K19A crc 16, start hh:00 and hh:30<br>and =
preliminary results can be found&nbsp;here (scroll to bottom):<br>DL0AO: ht=
tps://vlf.u01.de/LF/LFgrabber/ebnautresults.txt<br>DF6NM: https://vlf.u01.d=
e/LF/LFgrabber/ebnautresults.txt<br><br>This is nowhere near as perfect as =
Domenico's Linux solution, and our software contraption is&nbsp;nowhere&nbs=
p;near a stable state.&nbsp;Anyhow a&nbsp;few test transmissions&nbsp;with&=
nbsp;a couple of microwatts radiated power lead to useful decodes, and a tr=
ace also appeared in the opds spectrogram at DK7FC.&nbsp;It would be nice t=
o&nbsp;find some more signals later...<br><br>Best 73,<br>Markus (DF6NM)<br=
><br>-----Urspr=C3=BCngliche Mitteilung----- <br>Von: Domenico IZ7SLZ &lt;i=
z7slz.domenico@gmail.com&gt;<br>An: rsgb_lf_group &lt;rsgb_lf_group@blacksh=
eep.org&gt;<br>Verschickt: Di, 2. Okt 2018 1:18<br>Betreff: Re: LF: 2200M E=
bNaut Beacon<br><br></div><div id=3D"yiv1668961256"><div><div dir=3D"ltr"><=
div dir=3D"ltr"><div dir=3D"ltr"><div>LF EbNauters,<br clear=3D"none"><br c=
lear=3D"none"></div><div>thanks to Markus and Stefan for the comments and t=
o Rob for putting on air a very good signal. <br clear=3D"none"></div><div>=
I was also surprised to see the decode achieved by the auto-decoder without=
 any time and frequency offset !</div><div>Propagation conditions are becom=
ing better, but noise here is still high.</div><div>I tried a deep investig=
ation: no further decode,&nbsp; but with an offset of -0.0001 Hz and&nbsp;+=
0.005s (ooops !) i have improved the 2018-09-30_03:00 UT decode:</div><div>=
<br clear=3D"none"></div><div>initial reference phase -62.3 amplitude 2.049=
e-01<br clear=3D"none">phase&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&=
nbsp; 0&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp; 0<br clear=3D"none">carrier p=
hase: -6.9 deg<br clear=3D"none">carrier Eb/N0: 0.5 dB<br clear=3D"none">ca=
rrier Es/N0: -10.10 dB<br clear=3D"none">carrier S/N: 19.87 dB in 672.0 uHz=
, -11.86 dB in 1Hz, -45.84 dB in 2.5kHz<br clear=3D"none">elapsed 58<br cle=
ar=3D"none">found rank 43 ber 3.4980e-01 Eb/N0 -0.6 M -7.389708042e+00 ph 0=
 0,0,0,0 [K3RWR_FM18QI_73]<br clear=3D"none"><br clear=3D"none"></div><div>=
Looking on the October 1st recordings, with these offsets,&nbsp; i got anot=
her decode at 02:30 UT:</div><div><br clear=3D"none"></div><div>initial ref=
erence phase -6.6 amplitude 2.356e-01<br clear=3D"none">phase&nbsp;&nbsp; 0=
&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nb=
sp; 0<br clear=3D"none">carrier phase: -1.2 deg<br clear=3D"none">carrier E=
b/N0: 0.4 dB<br clear=3D"none">carrier Es/N0: -10.23 dB<br clear=3D"none">c=
arrier S/N: 19.74 dB in 672.0 uHz, -11.99 dB in 1Hz, -45.97 dB in 2.5kHz<br=
 clear=3D"none">elapsed 58<br clear=3D"none">found rank 84 ber 3.6694e-01 E=
b/N0 -1.7 M -7.504411221e+00 ph 0 0,0,0,0 [K3RWR_FM18QI_73]<br clear=3D"non=
e"></div><div><br clear=3D"none"></div><div>QRB&nbsp; is about 7600 km.</di=
v><div><br clear=3D"none"></div><div>Working conditions here, (vintage =F0=
=9F=98=80) as usual:</div><div>- miniwhip (a modified ex-Navtex antenna fro=
m Furuno ; see attachment)</div><div>- receiver JRC NRD-92M with external 1=
0 MHz reference signal steered by&nbsp; GPS</div><div>- a modest PC (Intel =
P4 CPU 3.50GHz x2) from scrap with Ubuntu 14.04LTS<br clear=3D"none"></div>=
<div>- software vlfrx-tool from Paul Nicholson.</div><div><br clear=3D"none=
"></div><div>I have attached also the latest version of&nbsp; the bash './a=
utoebnaut' i.e. the list of the commands that recall vlfrx-tool programs to=
 start the decoder each 30 minutes.</div><div>Other linux programs are runn=
ing in background:</div><div>- vtcard and vttime to manage and calibrate th=
e audio card</div><div>- vtwrite to store audio coming from receiver</div><=
div>- gpsd and chrony to manage the nmea and 1pps from neo8 gps (connected =
at serial COM1) and adjusting the PC clock.</div><div><br clear=3D"none"></=
div><div><br clear=3D"none"></div><div>73, Domenico IZ7SLZ <br clear=3D"non=
e"></div><div><br clear=3D"none"><br clear=3D"none">&nbsp;</div></div></div=
></div></div></div></div></div></div>
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