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=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: INFN-TO: mailn 1233; 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+deb8u2) with ESMTP id v65D6w5T009686 for ; Wed, 5 Jul 2017 15:07:00 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dSjw2-00076S-Pp for rs_out_1@blacksheep.org; Wed, 05 Jul 2017 14:01:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dSjw1-00076J-T5 for rsgb_lf_group@blacksheep.org; Wed, 05 Jul 2017 14:01:37 +0100 Received: from omr-a018e.mx.aol.com ([204.29.186.64]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1dSjvv-0001Uw-En for rsgb_lf_group@blacksheep.org; Wed, 05 Jul 2017 14:01:36 +0100 Received: from mtaomg-aan02.mx.aol.com (mtaomg-aan02.mx.aol.com [172.27.19.80]) by omr-a018e.mx.aol.com (Outbound Mail Relay) with ESMTP id 0047F3800225 for ; Wed, 5 Jul 2017 09:01:28 -0400 (EDT) Received: from core-acb01b.mail.aol.com (core-acb01.mail.aol.com [172.27.24.1]) by mtaomg-aan02.mx.aol.com (OMAG/Core Interface) with ESMTP id ADAF138000081 for ; Wed, 5 Jul 2017 09:01:27 -0400 (EDT) Received: from 80.146.228.87 by webprd-m76.mail.aol.com (10.74.63.44) with HTTP (WebMailUI); Wed, 05 Jul 2017 09:01:27 -0400 Date: Wed, 5 Jul 2017 09:01:27 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15d12d75150-1f3f-c06e@webprd-m76.mail.aol.com> In-Reply-To: MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS BASIC X-Originating-IP: [80.146.228.87] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1499259688; bh=7L086C5jdy82cjEwsHs0nemjGMVI9vIUAvGl7X2fReI=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=639Nvc12ebcWxkpfVeD3O/khIEN4J5lHrSpqgUPyg5o7crq9nC2hC88v24Iggfkn/ yl2MNebVFzx+oahQlz7VNBYvWvbOl/uC7CTrr6ib9qzPtOldlFMlu0tlavtha9VgE+ EIE5K08LeeAQtaKGjnLGvYVzdd6IwwVolHYhZFcY= x-aol-sid: 3039ac1b1350595ce32728b6 X-Scan-Signature: 6bb858db23df2b82c4f5a8cb512b45b1 Subject: Re: VO1NA on LF: Content-Type: multipart/alternative; boundary="----=_Part_56690_1493456031.1499259687246" 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: O X-Status: X-Keywords: X-UID: 12180 ------=_Part_56690_1493456031.1499259687246 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Joe, in the past, I have used DHO on 23.4 kHz to lock 8.97 kHz VLF carriers. It = was quite possible to pick up the distant signal MSK on a ferrite antenna i= n the presence of the strong local transmission, and SpecLabs samplerate co= rrector could successfully track the signal. The remaining problem was that= there is no way to cure phase jumps due to soundcard glitches or buffer un= derruns, and for that reason (at least with the then-used Atom netbook), I = never managed to produce a glitch-free multi-hour carrier. Thus I would be = hesitant to go down that route for EbNaut.=20 As Stefan mentioned, setting up GPS 1pps-lock with SpecLab is easy and chea= p. Audio feedback will correct both DAC / ADC glitches and phase shifts fro= m TX antenna tuning variations. Alternatively, replacing the OCXO for your hardware DDS by a 10 MHz Rubidiu= m source would also do the job, albeit a bit more expensive and power-consu= ming.=20 Best 73, Markus=20 -----Urspr=C3=BCngliche Mitteilung-----=20 Von: jcraig An: rsgb_lf_group Verschickt: Mi, 5. Jul 2017 1:06 Betreff: Re: VO1NA on LF: Hi Markus, The oscillator is still undisciplined -- much like your's truly. The carrier is still on with 1/3 A RF. I was considering getting a gps module until Stefan reported on his odyssey! In the mean time it seems like a good idea to use NAA as a reference for Spectrum Lab. With the RX antenna connected to the pc soundcard and the sample rate set to 96000, VLF_stations.usr gives a sharp 50 dB cutoff at 8 kHz and not a trace of NAA. Evidently more fiddling is required. High voltage managment has had gratifying results. The tuning coil is starting to look elegant with its 3 pies and a solenoid. Distributing=20 the kilovolts over more coils seems to have cured the sparking and ozone spewing. Thanks for the note, Markus. 73 Joe VO1NA On Mon, 3 Jul 2017, Markus Vester wrote: > Great news! Though it's high-QRN season here in central Europe, Paul will= surely detect you again in England. The DL0AO grabber also covers your QRG= and will hopefully be back online tomorrow. Tom and Bernd are preparing to= install a second earth antenna to the northwest soon, supporting a cardioi= d in your direction. > > So good luck with the high voltages! Any progress on the GPS frequency lo= ck? > > Best 73, > Markus (DF6NM) > > > -----Urspr=C3=BCngliche Mitteilung----- > Von: jcraig > An: rsgb_lf_group > Verschickt: Mo, 3. Jul 2017 16:51 > Betreff: Re: VO1NA on LF: > > > Hi Stefan, > > The TX is now on 8270.007 +- a few ppb. Thanks for the > advice and good luck to those looking for a trace of > the weak VLF sigs! > > Joe VO1NA > > On Mon, 3 Jul 2017, DK7FC wrote: > >> >> >> Am 03.07.2017 14:52, schrieb Roelof Bakker: >>> Hello Joe, >>> >>> Propagtion is a weird thing. >> >> LF propagation at least :-) MF even more. >> I find that VLF propagation is quite predictable, reproducable and >> understandable :-) >> >> 73, Stefan >> >> ------=_Part_56690_1493456031.1499259687246 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Joe,

in the past, I have used DHO on 23.4= kHz to lock 8.97 kHz VLF carriers. It was quite possible to pick up t= he distant signal MSK on a ferrite antenna in the presence of the stro= ng local transmission, and SpecLabs samplerate corrector could su= ccessfully track the signal. The remaining problem was that there is n= o way to cure phase jumps due to soundcard glitches or buffer und= erruns, and for that reason (at least with the then-used Atom netbook), I n= ever managed to produce a glitch-free multi-hour carrier. Thus I = would be hesitant to go down that route for EbNaut. 

As St= efan mentioned, setting up GPS 1pps-lock with SpecLab is easy and chea= p. Audio feedback will correct both DAC / ADC glitches and phase shifts fro= m TX antenna tuning variations.

Alternatively, replacing the OC= XO for your hardware DDS by a 10 MHz Rubidium source would also do the= job, albeit a bit more expensive and power-consuming. 
<= br>Best 73,
Markus 



-----Urspr=C3=BCngliche Mitteilu= ng-----
Von: jcraig <jcraig@mun.ca>
An: rsgb_lf_group <rsgb= _lf_group@blacksheep.org>
Verschickt: Mi, 5. Jul 2017 1:06
Betreff= : Re: VO1NA on LF:

Hi Markus,

The oscillator is still u= ndisciplined -- much like your's truly.
The carrier is still on with 1/3= A RF. I was considering getting
a gps module until Stefan reported on = his odyssey! In the mean time
it seems like a good idea to use NAA as a= reference for Spectrum Lab.
With the RX antenna connected to the pc sou= ndcard and the sample rate
set to 96000, VLF_stations.usr gives a sharp = 50 dB cutoff at 8 kHz
and not a trace of NAA. Evidently more fiddling is= required.

High voltage managment has had gratifying results. The tu= ning coil
is starting to look elegant with its 3 pies and a solenoid. Di= stributing
the kilovolts over more coils seems to have cured the sparki= ng and
ozone spewing.

Thanks for the note, Markus.

73
J= oe VO1NA

On Mon, 3 Jul 2017, Markus Vester wrote:

> Great = news! Though it's high-QRN season here in central Europe, Paul will surely = detect you again in England. The DL0AO grabber also covers your QRG and wil= l hopefully be back online tomorrow. Tom and Bernd are preparing to install= a second earth antenna to the northwest soon, supporting a cardioid in you= r direction.
>
> So good luck with the high voltages! Any progr= ess on the GPS frequency lock?
>
> Best 73,
> Markus (DF6= NM)
>
>
> -----Urspr=C3=BCngliche Mitteilung-----
>= Von: jcraig <jcraig@= mun.ca>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>> Verschickt: Mo, 3. Jul 2017 16:51
> Betreff: Re: VO1NA on LF:>
>
> Hi Stefan,
>
> The TX is now on 8270.007= +- a few ppb. Thanks for the
> advice and good luck to those looking= for a trace of
> the weak VLF sigs!
>
> Joe VO1NA
>= ;
> On Mon, 3 Jul 2017, DK7FC wrote:
>
>>
>><= br>>> Am 03.07.2017 14:52, schrieb Roelof Bakker:
>>> Hel= lo Joe,
>>>
>>> Propagtion is a weird thing.
>= ;>
>> LF propagation at least :-) MF even more.
>> I f= ind that VLF propagation is quite predictable, reproducable and
>>= understandable :-)
>>
>> 73, Stefan
>>
>&= gt;
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