Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tAHMuJ9q031703 for ; Tue, 17 Nov 2015 23:56:20 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Zyp3F-0002Wh-RK for rs_out_1@blacksheep.org; Tue, 17 Nov 2015 22:48:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Zyp3F-0002WY-FA for rsgb_lf_group@blacksheep.org; Tue, 17 Nov 2015 22:48:37 +0000 Received: from mail-wm0-f44.google.com ([74.125.82.44]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1Zyp2B-0000Mz-Av for rsgb_lf_group@blacksheep.org; Tue, 17 Nov 2015 22:48:36 +0000 Received: by wmvv187 with SMTP id v187so251591012wmv.1 for ; Tue, 17 Nov 2015 14:47:15 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=TbzPF99Y4JVYK/4wj47NwttR6mIBYyeZ6yYq9tgYdyQ=; b=m/MVZWcb0ov1L1haT2jaX8ok8Abz3pkNQmJqJhlyEELbERSCnAhGkf97BoPHqrqESe bAXO0myssNtU76eN4GgG5ATmxHLS4xp1q5zG8pVKcmdViNII+zz4J2RuMZ3BRtYmvPCc LRV0mCUjFH4wSyM0FD3VtC+krChlgWl8KHX66lkJybr0P098YiehOhK7QHHs2WL2Da4m d8wwNsX1Tdwas8QQqCvAmpeu0aIvkRrceGKUDyoE/tIajPG9OpLxPX7ioiOaxV8/tkiC td75BJhT8PxHOqVwZ9KznvEUSXMQOyygldB585xw+G8KqyOML16cdZw0Tp4JNLDpNLaL ZOgA== MIME-Version: 1.0 X-Received: by 10.194.95.202 with SMTP id dm10mr46508515wjb.56.1447800435296; Tue, 17 Nov 2015 14:47:15 -0800 (PST) Received: by 10.28.130.139 with HTTP; Tue, 17 Nov 2015 14:47:15 -0800 (PST) In-Reply-To: <8D2EF9BD3D97406-14E0-9D616@webmail-vm077.sysops.aol.com> References: <8D2EF9A3CE57043-178C-BA198@webmail-vd022.sysops.aol.com> <8D2EF9BD3D97406-14E0-9D616@webmail-vm077.sysops.aol.com> Date: Tue, 17 Nov 2015 22:47:15 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@yahoogroups.co.uk, rsgb_lf_group@blacksheep.org X-Scan-Signature: 05df7db787776cda2726d56f546a4588 Subject: Re: [rsgb_lf_group] Re: LF: Re: EbNaut test transmission Content-Type: multipart/alternative; boundary=047d7bb042fea6d5080524c44e27 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 5129 --047d7bb042fea6d5080524c44e27 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Ok, I'll leave it running overnight. After the rain stopped, antenna resistance fell and power output rose closer to 300 Watts of RF into the lower Rant, so EIRP is about +20dBm now. To reiterate for any new readers: Frequency 137780.000 +/- 0.2mHz Coding 8K19A Symbol period 0.5s (2 symbols / sec) BPSK with 10ms Gaussian shaped phase transition Message length is 9 characters consisting of a callsign and the abbreviated name of a well-known cockatiel PC time is synchronised using rsNTP, set for periodic updates which it appears to do every 30 minutes. So far it hasn't made a correction of more than 20ms (ignoring the first one back at 1611z) The DOCXO (almost a TrOCXO) appears to have stayed well within 1ppb of its correct frequency all afternoon / evening. I check by comparing a divided down 1PPS signal against GPS, looking to see how many microseconds the two respective edges drift apart over a few hours. If it moves by more than that corresponding to 2 PPB (7.2us per hour) a slight tweak to the frequency control pot gets it back again. For really serious work, the Caesium tube could be turned on, but that requires about 60 to 90 minutes for warm up to reach stable operation. Something only worth doing for long duration tests at lower rates. The last part of the message comes from this chap, who's ghost still haunts my shack ... http://www.g4jnt.com/basil.htm Andy G4JNT On 17 November 2015 at 22:09, Markus Vester markusvester@aol.com [rsgb_lf_group] wrote: > > > > I have set up a dedicated small SpecLab instance for EbNaut data, with > spectrogram uploads to > https://dl.dropboxusercontent.com/u/26404526/EbNaut_spectrogram.png . > The signal is generally weaker now, but still good decodes (2.2 dB > Eb/N0 for 21:00 UT). As far as I can see, transmit timing and frequency a= re > perfect. > > My auxiliary EbNaut utilities > http://df6nm.bplaced.net/VLF/fec_tests/df6nm_ebnaut_utilities.zip > include opds-32 SpecLab settings, along with the text file containing inf= o > how to get-started. Hope it may be useful... > > Best 73, > Markus (DF6NM) > > > -----Urspr=C3=BCngliche Mitteilung----- > Von: Markus Vester > An: rsgb_lf_group > Verschickt: Di, 17 Nov 2015 6:54 pm > Betreff: Re: LF: Re: EbNaut test transmission > > Andy, > > getting even better... 56/704 symbol errors and 11.2 dB Eb/N0 for the > 16:30 message. > > I'm sure that Domenico will be able to pick up the signal in South Italy. > Would anyone in TA-land want to attempt a decode tonight? > > --047d7bb042fea6d5080524c44e27 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Ok, I'll leave it running overnight. =C2=A0 After =C2= =A0the rain stopped, =C2=A0antenna resistance fell and power output rose cl= oser to 300 Watts of RF =C2=A0into the lower Rant, so EIRP is about +20dBm = now.

To reiterate for any new readers:

=C2=A0 =C2=A0Frequency 137780.000= =C2=A0 +/- 0.2mHz
=C2=A0 =C2=A0Coding = 8K19A =C2=A0
=C2=A0 =C2=A0Symbol perio= d=C2=A0 0.5s=C2=A0=C2=A0 (2 symbols / sec) =C2=A0 BPSK with 10ms Gaussian = =C2=A0shaped phase transition
=C2=A0 = =C2=A0Message length is 9 characters consisting of a callsign and the abbre= viated name of a well-known cockatiel

PC time is sy= nchronised using rsNTP, =C2=A0set for periodic updates which it appears to = do every 30 minutes.=C2=A0 So far it hasn't made a correction of more t= han 20ms (ignoring the first one back at 1611z)

Th= e DOCXO (almost a TrOCXO) =C2=A0appears to have stayed well within 1ppb of = its correct frequency all afternoon / evening. =C2=A0 I check by comparing = a divided down 1PPS signal against GPS, =C2=A0looking to see how many micro= seconds the two respective edges drift apart over a few hours. =C2=A0 If it= moves by more than that corresponding to 2 PPB =C2=A0 (7.2us per hour) =C2= =A0a slight tweak to the frequency control pot gets it back again.

For really serious work, the Caesium tube could be turned = on, but that requires about 60 to 90 minutes for warm up to reach stable op= eration. =C2=A0 =C2=A0Something only worth doing for long duration tests at= lower rates. =C2=A0

The last part of the message = comes from this chap, who's ghost still haunts my shack ... =C2=A0 http://www.g4jnt.c= om/basil.htm

Andy =C2=A0G4JNT
=


On 17 November 2015 at 22:09, Markus Vester markusvester@aol.com [rsgb_lf_group]= <rsgb_lf_group@yahoogroups.co.uk> wrote:
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;pa= dding-left:1ex"> =20
=C2=A0
=20 =20

=C2=A0
I have set up a dedicated small SpecLab instance for EbNaut data, with spec= trogram uploads to
=20 =20
=20
=20
The signal is generally=C2=A0weaker now, but still go= od decodes=C2=A0(2.2 dB Eb/N0=C2=A0for 21:00 UT). As far as I can see, tran= smit timing and frequency are perfect.
=20
=C2=A0
=20
My=C2=A0auxiliary EbNaut utilities=C2=A0
=20 =20
include opds-32 SpecLab settings, along with=C2=A0the=C2=A0text file c= ontaining=C2=A0info how to get-started. Hope it may be useful...
=20
=C2=A0
=20
Best 73,
=20
Markus (DF6NM)
=20
=C2=A0
=20

-----Urspr=C3=BCngliche Mitteilung-----
Von: Markus Vester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Di, 17 Nov 2015 6:54 pm
Betreff: Re: LF: Re: EbNaut test transmission

=20
=20
=20
Andy,
=20
=C2=A0
=20
getting even better... 56/704 symbol errors and=C2=A0= 11.2 dB Eb/N0 for the 16:30 message.
=20
=C2=A0
=20
=20
I'm sure th= at=C2=A0Domenico will be able to=C2=A0pick up the signal in South Italy. Wo= uld anyone in TA-land want to attempt a decode tonight?
=20
=C2=A0
--047d7bb042fea6d5080524c44e27--