Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,RCVD_IN_DNSWL_MED,SPF_PASS,T_DKIM_INVALID, T_KAM_HTML_FONT_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v24Dwb11031752 for ; Sat, 4 Mar 2017 14:58:38 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ckA8X-0003N3-V5 for rs_out_1@blacksheep.org; Sat, 04 Mar 2017 13:54:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ckA8X-0003Mu-6u for rsgb_lf_group@blacksheep.org; Sat, 04 Mar 2017 13:54:17 +0000 Received: from smtpcmd04138.aruba.it ([62.149.158.138]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1ckA8O-0002fr-BJ for rsgb_lf_group@blacksheep.org; Sat, 04 Mar 2017 13:54:16 +0000 Received: from ik0vve.net ([62.149.158.90]) by smtpcmd04.ad.aruba.it with bizsmtp id rpu61u00g1xJdJu01pu63R; Sat, 04 Mar 2017 14:54:06 +0100 Date: Sat, 4 Mar 2017 14:54:06 +0100 Message-Id: In-Reply-To: <58B9C14D.5090403@posteo.de> References: <15a944b24fd-44c1-9a00@webprd-m71.mail.aol.com> <58B9C14D.5090403@posteo.de> MIME-Version: 1.0 X-Sensitivity: 3 From: "Max IK0VVE" To: rsgb_lf_group@blacksheep.org X-XaM3-API-Version: V3(R2) X-SenderIP: 212.66.105.4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aruba.it; s=a1; t=1488635647; bh=jALr2O1RqZANWQG1XtIvjHSX9QaHe5peIOWbTTYnX1U=; h=Date:Subject:MIME-Version:Content-Type:From:To; b=ADmcTdcIpt7Nsc03gzCTfRLSuWqlDS/AzVrhCIa0u/qR9qgBpUl2GfmRoIDpc7qHW 8oO5A2vLdqLTxpPBY0B+c0pd8Rt0Ce1Amh7OAF/Q/Y4bghNXuiiXxuELSgOiPQ2J2l ZdK+58LwM+uZSzb9w1UHh+feU4yS9tIT8A/XDBmniNnQ7WEV8kcgDjp+9Df6+vbl45 WCfF9Q0QXy+mjQChPvtyL5ye+ddFFrLJ8DEaffaTdlmtvNsS7Hnio+FwCXHzaOWUka f5nUh1vBA7qIlbCcW66maHvc2Ri/j/GLr3C86ReG0Q8JHxa1PgqreXa2NKjapXG+qt zJInsnHJv0avQ== X-Scan-Signature: 5f3d51ad98dd7d967f54e1b86b99caac Subject: Re: VLF: Tonite... Content-Type: multipart/alternative; boundary="_=__=_XaM3_.1488635646.2A.596609.42.27627.52.42.007.1402335420" 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 2.75 Status: RO X-Status: X-Keywords: X-UID: 10779 --_=__=_XaM3_.1488635646.2A.596609.42.27627.52.42.007.1402335420 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable DR friends,=0A=C2=A0=0Athere's a weak trace on my grabber... quite strong= sirocco wind at the moment is shaking my loop antenna and noise is incre= ased.=0AEbNaut SL session is running, too.=C2=A0=0A=0A73, Max IK0VVE=C2=A0= =0A=0A=0A______________________________=C2=A0...here some of my HAM Radio= projects...SkyGeM RotatorAntennaDinamicaRCR-DX=0Awww.ik0vve.net=0A=0A=0A= Da: owner-rsgb_lf_group@blacksheep.org=0AA: rsgb_lf_group@blacksheep.org=0A= Cc: =0AData: Fri, 03 Mar 2017 20:17:33 +0100=0AOggetto: Re: VLF: Tonite..= .=0A=0A=0A=0A=0A=0A =0A=0A=0AThanks Markus, Jacek and Eddie for the deco= des.=0A=0A=0A=0AI'm planning a new message for tonite but still need some= time to build=0Aup a new PC into the VLF TX system. The old one has 512 = MB RAM, the new=0Aone has 2 GB which should make a real difference regard= ing soundcard=0Aglitches. Additionally i'm moving from PPS+NTP to PPS+NME= A.=0A=0A=0A=0AAnnouncement follows...=0A=0A=0A=0A73, Stefan=0A=0A=0A=0A=0A= =0AAm 03.03.2017 14:10, schrieb Markus Vester:=0A=0A =0A Good=0Adecode = here as well.=0A =0A=0AThis transmission came just in time for me to tes= t a different setup,=0Ausing samplerate lock to DCF77 rather than 1pps. I= 'm using a cheap=0ADelock USB sound dongle with VIA VT1630A chipset, whic= h happens to have=0Aonly moderate antialias filtering. With 48 kHz sample= rate, DCF77 can be=0Apicked up in the 4th Nyqist band with only about 30 = dB attenuation.=0ASpecLab's samplerate detector initially warns about the= too-low=0Asamplerate, but anyway processes the subsampled reference corr= ectly. At=0Amy distance from DCF77 (160 km), there is a bit of nighttime = phase=0Avariation, but fortunately this is reduced by almost an order of=0A= magnitude=C2=A0when scaling from 77.5 to 8.27 kHz. =0A =0A=0AAfter havin= g decoded Stefan's message, I undid the PSK modulation and=0Aplotted the = received phase in 10 minute averages. There seems to be=0Asome minor long= -term phase drift, but apparently no phase-jumps from=0Adropouts have occ= urred.=0A =0A=0AThe same trick could probably also be used with other ti= me signals,=0Ae.g. 60, 66.667, 162 or 198 kHz. With appropriate filtering= , it is even=0Apossible to receive 137 kHz directly by subsampling. This = might be a=0Auseful way to steer the phase of an LF EbNaut transmitter by= =0AGPS-phaselock, removing the need for an accurate local oscillator.=0A = =0A=0ABest 73,=0A=0AMarkus (DF6NM)=0A =C2=A0=0A=0A =0A=0Aebnaut-rx V0.= 5=0A=0Ainput file 03030123a.wav=0A=0Asample rate 0.514405 per second=0A=0A= rx frequency 8270=0A=0Afile start time 2017-03-02 20:58:21.300=0A=0Apolyn= omial 16K21A=0A=0Acrc size 28=0A=0Anumber of chars 2=0A=0Ablock size 40=0A= =0Asymbol period 30.000=0A=0Anumber of symbols 960=0A=0Alist length 20000= 0=0A=0Astart offset 407.000=0A=0Afreq offset 0.100000=0A=0Acores 2=0A=0As= kipped 406.294730 seconds to start=0A=0Ainitial reference phase 40.0=0A=0A= ---------------------------------------------=0A=0Afound XX=0A=0Alist ran= k 0=0A=0Areference phase=C2=A0 180=C2=A0 180=C2=A0 180=C2=A0 180=0A=0Acar= rier RMS 2.675e+004 noise RMS 1.578e+003=0A=0Acarrier S/N 24.58 dB in 34.= 7 uHz=0A=0Acarrier Es/N0 -5.24 dB=0A=0Acarrier Eb/N0 14.01 dB=0A=0Ainfo b= it period 2526.32 seconds=0A=0Asymbol error rate 192/960 =3D 20.000 %=0A=0A= Es/N0 from symbol errors -4.5 dB=0A=0AEb/N0 from symbol errors 14.8 dB=0A= =0AShannon capacity 45.3 bits/hour=0A=0AShannon efficiency 3.1 %=0A=0Asym= bols file 03030123a-symbols.csv=0A=0Aelapsed 10 seconds=0A=0A------------= ---------------------------------=0A=0Afound XX=0A=0Alist rank 0=0A=0Aref= erence phase=C2=A0 150=C2=A0 150=C2=A0 180=C2=A0 180=0A=0Acarrier RMS 2.6= 72e+004 noise RMS 1.578e+003=0A=0Acarrier S/N 24.57 dB in 34.7 uHz=0A=0Ac= arrier Es/N0 -5.25 dB=0A=0Acarrier Eb/N0 14.00 dB=0A=0Ainfo bit period 25= 26.32 seconds=0A=0Asymbol error rate 186/960 =3D 19.375 %=0A=0AEs/N0 from= symbol errors -4.2 dB=0A=0AEb/N0 from symbol errors 15.1 dB=0A=0AShannon= capacity 45.2 bits/hour=0A=0AShannon efficiency 3.2 %=0A=0Asymbols file = 03030123a-symbols.csv=0A=0Aelapsed 126 seconds=0A =0A=0A =0A=0A =0A=0A= -----Urspr=C3=BCngliche Mitteilung----- =0A=0AVon: DK7FC =0A=0AAn: rsgb_lf_group =0A=0AVersc= hickt: Do, 2. Mrz 2017 22:15=0A=0ABetreff: VLF: Tonite...=0A=0A =0A=0A = =0A =0A Hi all,=0A =0A=0A =0A=0AIt's time for a new EbNaut transmissi= on. Another attempt to get a=0Adecode from IK0VVE or IZ7SLZ and of course= also for anyone else who is=0Ainterested :-)=0A=0A =0A=0A f =3D 8270.1= 00000 Hz=0A=0AStart time: Thursday 02.Mar.2017 =C2=A0 21:05:00 UTC (alrea= dy running!)=0A=0ASymbol period: 30 s=0A=0ACharacters: 2=0A=0ACRC bits: 2= 8 =0A=0ACoding 16K21A=0A=0ADuration: 8h, 0m, 0s=0A=0AAntenna current: 700= mA=0A=0A =0A=0A If no decode appears, then it may help to repeat the=0A= process=0Aand increase the list length to very large values, like 2000000= . =0A=0A =0A=0A73, Stefan=0A=0A =0A =0A =0A=0A=0A=0A --_=__=_XaM3_.1488635646.2A.596609.42.27627.52.42.007.1402335420 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
DR friends, 
there's a weak trace on my grabber... quite strong sirocco wi= nd at the moment is shaking my loop antenna and noise is increased.
Eb= Naut SL session is running, too. 

73, Max IK0VVE 

______________________________

 
...here some of my HAM Radio projects...



=0A
Da: owner-rsgb_lf_= group@blacksheep.org
=0A
A: rsgb_lf_group@blac= ksheep.org
=0A
Cc:
=0A
Data: Fri, 03 Mar 2017 20:17:33 +0100
=0A
Oggetto: Re: VLF: Tonite...
=0A
=0A=0A=0A=0A =0A=0A=0ATh= anks Markus, Jacek and Eddie for the decodes.
=0A
=0AI'm planning a= new message for tonite but still need some time to build=0Aup a new PC i= nto the VLF TX system. The old one has 512 MB RAM, the new=0Aone has 2 GB= which should make a real difference regarding soundcard=0Aglitches. Addi= tionally i'm moving from PPS+NTP to PPS+NMEA.
=0A
=0AAnnouncement f= ollows...
=0A
=0A73, Stefan
=0A
=0A
=0AAm 03.03.2017 14:10= , schrieb Markus Vester:=0A
=0A
=0A
Good=0Adecode here as well.
=0A

=0AThis trans= mission came just in time for me to test a different setup,=0Ausing sampl= erate lock to DCF77 rather than 1pps. I'm using a cheap=0ADelock USB soun= d dongle with VIA VT1630A chipset, which happens to have=0Aonly moderate = antialias filtering. With 48 kHz samplerate, DCF77 can be=0Apicked up in = the 4th Nyqist band with only about 30 dB attenuation.=0ASpecLab's sample= rate detector initially warns about the too-low=0Asamplerate, but anyway = processes the subsampled reference correctly. At=0Amy distance from DCF77= (160 km), there is a bit of nighttime phase=0Avariation, but fortunately= this is reduced by almost an order of=0Amagnitude when scaling from= 77.5 to 8.27 kHz.
=0A

=0AAfter having decoded S= tefan's message, I undid the PSK modulation and=0Aplotted the received ph= ase in 10 minute averages. There seems to be=0Asome minor long-term phase= drift, but apparently no phase-jumps from=0Adropouts have occurred.=0A

=0AThe same trick could probably also be used wit= h other time signals,=0Ae.g. 60, 66.667, 162 or 198 kHz. With appropriate= filtering, it is even=0Apossible to receive 137 kHz directly by subsampl= ing. This might be a=0Auseful way to steer the phase of an LF EbNaut tran= smitter by=0AGPS-phaselock, removing the need for an accurate local oscil= lator.
=0A

=0ABest 73,
=0AMarkus (DF6NM)
= =0A
 
=0A
=0Aebnaut-rx V0.5
=0Ainput file = 03030123a.wav
=0Asample rate 0.514405 per second
=0Arx frequency 82= 70
=0Afile start time 2017-03-02 20:58:21.300
=0Apolynomial 16K21A<= br>=0Acrc size 28
=0Anumber of chars 2
=0Ablock size 40
=0Asymbo= l period 30.000
=0Anumber of symbols 960
=0Alist length 200000
=0A= start offset 407.000
=0Afreq offset 0.100000
=0Acores 2
=0Askipp= ed 406.294730 seconds to start
=0Ainitial reference phase 40.0
=0A-= --------------------------------------------
=0Afound XX
=0Alist ra= nk 0
=0Areference phase  180  180  180  180
=0A= carrier RMS 2.675e+004 noise RMS 1.578e+003
=0Acarrier S/N 24.58 dB in= 34.7 uHz
=0Acarrier Es/N0 -5.24 dB
=0Acarrier Eb/N0 14.01 dB
=0A= info bit period 2526.32 seconds
=0Asymbol error rate 192/960 =3D 20.00= 0 %
=0AEs/N0 from symbol errors -4.5 dB
=0AEb/N0 from symbol errors= 14.8 dB
=0AShannon capacity 45.3 bits/hour
=0AShannon efficiency 3= .1 %
=0Asymbols file 03030123a-symbols.csv
=0Aelapsed 10 seconds=0A---------------------------------------------
=0Afound XX
=0Ali= st rank 0
=0Areference phase  150  150  180  180=0Acarrier RMS 2.672e+004 noise RMS 1.578e+003
=0Acarrier S/N 24.57 = dB in 34.7 uHz
=0Acarrier Es/N0 -5.25 dB
=0Acarrier Eb/N0 14.00 dB<= br>=0Ainfo bit period 2526.32 seconds
=0Asymbol error rate 186/960 =3D= 19.375 %
=0AEs/N0 from symbol errors -4.2 dB
=0AEb/N0 from symbol = errors 15.1 dB
=0AShannon capacity 45.2 bits/hour
=0AShannon effici= ency 3.2 %
=0Asymbols file 03030123a-symbols.csv
=0Aelapsed 126 sec= onds
=0A

=0A
=0A
=0A-----Urspr=C3=BCngl= iche Mitteilung-----
=0AVon: DK7FC <selberdenken@posteo.de>
=0AAn: rsgb_lf_group <rsgb_lf_group= @blacksheep.org>
=0AVerschickt: Do, 2. Mrz 2017 22:15
=0ABet= reff: VLF: Tonite...
=0A
=0A
=0A
=0A
Hi all,=0A
=0A
=0AIt's ti= me for a new EbNaut transmission. Another attempt to get a=0Adecode from = IK0VVE or IZ7SLZ and of course also for anyone else who is=0Ainterested := -)
=0A
=0A f =3D 8270.100000 Hz
=0AStart time: Thursd= ay 02.Mar.2017   21:05:00 UTC (already running!)
=0ASymbol period= : 30 s
=0ACharacters: 2
=0ACRC bits: 28
=0ACoding 16K21A
=0A= Duration: 8h, 0m, 0s
=0AAntenna current: 700 mA
=0A
=0A <= /big> If no decode appears, then it may help to repeat the=0Aprocess=0Aan= d increase the list length to very large values, like 2000000.
=0A <= br>=0A73, Stefan
=0A
=0A
=0A
=0A
=0A=0A= =0A
--_=__=_XaM3_.1488635646.2A.596609.42.27627.52.42.007.1402335420--