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The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Link corrected beneath. -----Ursprüngliche Mitteilung----- Von: Markus Vester An: rsgb_lf_group Verschickt: Mi, 3. Okt 2018 14:46 Betreff: LF: EbNaut Autodecoder 137490 Hz After some playing around, we are running an experimental EbNaut autodecoder at DL0AO and DF6NM under Windows. Receive parameters are currently  137490.000 Hz, 6 char, 3 s, 8K19A crc 16, start hh:00 and hh:30 and preliminary results can be found here (scroll to bottom): DL0AO: https://vlf.u01.de/LF/LFgrabber/ebnautresults.txt DF6NM: http://df6nm.darc.de/opds/ebnautresults.txt [...] Content analysis details: (1.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [74.6.135.123 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 1.6 FORGED_MUA_MOZILLA Forged mail pretending to be from Mozilla X-Scan-Signature: 13abe497adcf17a4e25c5e2a2ff79111 Subject: Re: LF: EbNaut Autodecoder 137490 Hz Content-Type: multipart/alternative; boundary="----=_Part_3421504_619496956.1538570933958" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: *** X-Spam-Status: No, hits=3.2 required=5.0 tests=FORGED_MUA_MOZILLA,HTML_20_30, HTML_MESSAGE 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 ------=_Part_3421504_619496956.1538570933958 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Link corrected beneath. -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Markus Vester An: rsgb_lf_group Verschickt: Mi, 3. Okt 2018 14:46 Betreff: LF: EbNaut Autodecoder 137490 Hz 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: http://df6nm.darc.de/opds/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 An: rsgb_lf_group 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 ------=_Part_3421504_619496956.1538570933958 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Link corrected beneath.

-----Urspr=C3=BCngliche M= itteilung-----
Von: Markus Vester <markusvester@aol.com>
An: r= sgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mi, 3. Okt= 2018 14:46
Betreff: LF: EbNaut Autodecoder 137490 Hz

=
After some playing around, we are running an experimenta= l EbNaut autodecoder at DL0AO and DF6NM under Windows. Receive pa= rameters are currently
 137490.000 Hz, 6 char, 3 s, 8K19A crc 16, s= tart hh:00 and hh:30
and preliminary results can be found here (scr= oll to bottom):
DL0AO: https://vlf.u01.de/LF/LFgrabber/ebnautres= ults.txt
DF6NM: http://df6nm.darc.de/opds/ebnautresults= .txt

This is nowhere near as perfect as Domenico's Linux so= lution, and our software contraption is nowhere near a stable sta= te. Anyhow a few test transmissions with a couple of mi= crowatts radiated power lead to useful decodes, and a trace also appeared i= n the opds spectrogram at DK7FC. It would be nice to find some mo= re signals later...

Best 73,
Markus (DF6NM)

-----Urspr=C3= =BCngliche Mitteilung-----
Von: Domenico IZ7SLZ <iz7slz.domenico@gma= il.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Ver= schickt: 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.
I was also surpris= ed to see the decode achieved by the auto-decoder without any time and freq= uency offset !
Propagation conditions are becoming better, but no= ise here is still high.
I tried a deep investigation: no further = decode,  but with an offset of -0.0001 Hz and +0.005s (ooops !) i= have improved the 2018-09-30_03:00 UT decode:

initial reference phase -62.3 amplitude 2.049e-01
phase   0    0    0  = ;  0    0
carrier phase: -6.9 deg
carrier Eb/N0: 0.5 dB
carrier Es/N0: -10.1= 0 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 [K3RWR_FM= 18QI_73]

Looking on the Oct= ober 1st recordings, with these offsets,  i got another decode at 02:3= 0 UT:

initial reference phase -6.6 = amplitude 2.356e-01
phase   0   = 0    0    0    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
el= apsed 58
found rank 84 ber 3.6694e-01 Eb/N0 -1.7 M -7.504= 411221e+00 ph 0 0,0,0,0 [K3RWR_FM18QI_73]

QRB  is about 7600 km.

Working conditions here, (vintage =F0=9F=98=80) as usu= al:
- miniwhip (a modified ex-Navtex antenna from Furuno ; see at= tachment)
- receiver JRC NRD-92M with external 10 MHz reference s= ignal steered by  GPS
- a modest PC (Intel P4 CPU 3.50GHz x2= ) from scrap with Ubuntu 14.04LTS
- software v= lfrx-tool from Paul Nicholson.

I ha= ve attached also the latest version of  the bash './autoebnaut' i.e. t= he list of the commands that recall vlfrx-tool programs to start the decode= r each 30 minutes.
Other linux programs are running in background= :
- vtcard and vttime to manage and calibrate the audio card
- vtwrite to store audio coming from receiver
- gpsd and ch= rony to manage the nmea and 1pps from neo8 gps (connected at serial COM1) a= nd adjusting the PC clock.


73, Domenico IZ7SLZ

 
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