Return-Path: Received: from mtain-dh01.r1000.mx.aol.com (mtain-dh01.r1000.mx.aol.com [172.29.65.21]) by air-da06.mail.aol.com (v129.4) with ESMTP id MAILINDA063-863e4d18d5e5384; Mon, 27 Dec 2010 13:07:33 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh01.r1000.mx.aol.com (Internet Inbound) with ESMTP id EA80338000220; Mon, 27 Dec 2010 13:07:29 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PXHSW-0008TB-6S for rs_out_1@blacksheep.org; Mon, 27 Dec 2010 18:06:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PXHSV-0008T2-8X for rsgb_lf_group@blacksheep.org; Mon, 27 Dec 2010 18:06:11 +0000 Received: from mail-iw0-f171.google.com ([209.85.214.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PXHSS-0002jo-ND for rsgb_lf_group@blacksheep.org; Mon, 27 Dec 2010 18:06:11 +0000 Received: by iwn2 with SMTP id 2so8834162iwn.16 for ; Mon, 27 Dec 2010 10:06:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=b769cFzbtpNoYWMp9YXNvVDXmZ6AnnFGHjrRzcBfKME=; b=oDkWur7YkYmHXE5fjOALutbvRdCuoA/ZZf2hMCmN2Vo8nm7g9tgcqem3byATNiQczb OwfcB28/lsZ+Iml1b9j2BGSFM5fsSu5kNPvFUQIzEQ2bcYY8M2leQBa940WUaSA1oPeO o/aIoRrLoIqqO57WPqIvjR6yCVi5eud1UdyIg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=djBH4aNCf3LXtSUe1PxVGb0FHoVjayYG0ZslN/7JvHvB6AaHJIAexPHCJ+bOD88RfC A+HDZ7UuDrVu9VEhjG6/HGBKqMfZGBbNVoEPhPoaaVCNHKF1OW6l6Qlcs9JkN//lX9lW 1C02a3of94g4sr7b9c3DW8U4IvLwWbCygDsY4= MIME-Version: 1.0 Received: by 10.231.199.10 with SMTP id eq10mr12264382ibb.112.1293473167199; Mon, 27 Dec 2010 10:06:07 -0800 (PST) Received: by 10.231.200.211 with HTTP; Mon, 27 Dec 2010 10:06:07 -0800 (PST) In-Reply-To: References: <77525.18216.qm@web28511.mail.ukl.yahoo.com> <470957.28626.qm@web28506.mail.ukl.yahoo.com> Date: Mon, 27 Dec 2010 18:06:07 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: VLF - G3XIZ - QRT Content-Type: multipart/alternative; boundary=90e6ba4fc4c6a84f8504986830eb X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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 x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d286.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d41154d18d5e11220 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --90e6ba4fc4c6a84f8504986830eb Content-Type: text/plain; charset=ISO-8859-1 Yes. There are a couple of possible other lines too, and if it wasn't for the fact that the line shown very definitely wasn't there when I restarted the Rx after Chris had announced he was QRT, I wouldn't have been nearly so confident. Its a great pity the Rx wasn't actually doing its job as the signal went off. WHY does saving a screen grab stop the Rx - that's just mad. I'll use a [ctl]-[prt scn} next time. The correct freq was read off on the cursor, so I know the frequency cal was OK. The SDR-IQ driver software (Spectravue) can go to much lower bandwidths, but playing about with it a few dys ago to check calibration issues, if the decimated sampling rate is set to one of the values lower than 55kHz then frequency accuracy is not brilliant - I was seeing 0.4Hz readout error on the cursor against known frequencies so need to work out why that is. Keeping to a 55kHz rate, readout error was to within a bin's accuracy. Presumably 55kHz is the highest single - decimation allowed by the digital downconverter (Fclock / 1200) and going lower introduces a double decimation process. Max FFT size is 2Meg, so at 55kHz, BW is then restricted to 0.03Hz. It will go to 5kHz sampling, so theoretically the software can get get down to .003Hz bin size, but testing it all out at the resulting 6 minute update rate would be more than a bit tedious - and would need at least QRSS600 signalling. Andy www.g4jnt.com On 27 December 2010 13:57, Markus Vester wrote: > Hi Andy, Chris, > > there is certainly a good looking trace at 8972 in your screenshot. What is > a bit suspicious is that the calibration dash would place it about 1 Hz up, > and also that there is another dash appearing at 8998 Hz at the same time. > > Wishing you all success for this fasinating work, > > Markus (DF6NM) > > *From:* Andy Talbot > *Sent:* Monday, December 27, 2010 2:10 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: VLF - G3XIZ - QRT > > Unfortunately taking that screen grab stopped teh SDR-IQ and I didn't > notice for a while. Anyway, after eventually restarting there is not even > the faintest indication of a line at the appropriate spot, which does > suggest a possibility your QRSS 3600 signal was detected. > > Look forward to your next transmission - with slower dot period please. > > Andy > www.g4jnt.com > > > On 27 December 2010 12:28, Andy Talbot wrote: > >> At what time did you turn off? >> >> Take a look at http://www.g4jnt.com/DownLoad/XIZ_1.jpg where there is >> just the faintest line at the right frequency - looking in a bandwidth of >> 0.05Hz. >> >> (The other point labelled is wher ei inject a frequency 10Hz higher at the >> start to check frequency cal) >> >> If it is genuine, and not just a spuron, then QRSS 60 would probably show >> results. >> >> Its still running to see if that just-possible line has now clearly gone. >> >> Andy >> www.g4jnt.com >> >> >> On 27 December 2010 12:20, Chris Osborn wrote: >> >>> Thanks for your efforts chaps. >>> >>> I had definite QRSS-3 confirmation from Dennis M0JXM at 1.5 km but Pete >>> M0FMT at 11 km >>> had no copy. >>> >>> I have developed an intermittent short-circuit problem with the loading >>> coil and will QRT now. >>> >>> I'll notify via the reflector when transmitting again. >>> >>> 73 Chris XIZ >>> >>> ------------------------------ >>> *From:* James Moritz >>> *To:* rsgb_lf_group@blacksheep.org >>> *Sent:* Mon, 27 December, 2010 11:44:17 >>> *Subject:* LF: Re: VLF - G3XIZ >>> >>> Dear Chris, LF Group, >>> >>> The VLF RX has been running since 1130 - Nothing seen yet. >>> >>> Cheers, Jim Moritz >>> 73 de M0BMU >>> >>> >>> >>> >> > --90e6ba4fc4c6a84f8504986830eb Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Yes.=A0=A0 There are a couple of possible other lines too, and if it= wasn't for the fact that the line shown=A0very definitely wasn't= there when I restarted the Rx after Chris had announced he was QRT, I wou= ldn't have been nearly so confident.=A0 Its a great pity the Rx wasn&#= 39;t actually doing its job as the signal went off.=A0=A0 WHY does saving= a screen grab stop the Rx - that's just mad.=A0=A0 I'll use a [ct= l]-[prt scn} next time.
=A0
The correct freq was read off on the cursor, so I know the frequency= cal was OK.=A0
=A0
The SDR-IQ driver software (Spectravue) can go to much lower bandwidt= hs, but playing about with it a few dys ago to check calibration issues,= if the decimated sampling rate is set to one of the values lower=A0than= 55kHz then frequency accuracy is not brilliant - I was seeing 0.4Hz reado= ut error on the cursor against known frequencies so need to work out why= that is.=A0=A0=A0 Keeping to a 55kHz rate, readout error was to within a= bin's accuracy.=A0=A0=A0 Presumably 55kHz is the highest single - dec= imation allowed by the digital downconverter (Fclock / 1200)=A0 and going= lower introduces a double decimation process.=A0=A0=A0=A0=A0 Max FFT size= is 2Meg, so at 55kHz, BW is then restricted to 0.03Hz.
=A0
It will go to 5kHz sampling, so theoretically the software can get ge= t down to .003Hz bin size, but testing it all out at the resulting 6 minut= e update rate would be more than a bit tedious - and would need at least= =A0QRSS600 signalling.
=A0
Andy


=A0
On 27 December 2010 13:57, Markus Vester <markusvester@aol.= com> wrote:
Hi Andy, Chris,
=A0
there is certainly a good looking tra= ce at 8972 in your screenshot. What is a bit suspicious is that=A0the cali= bration dash=A0would place it about 1 Hz=A0up, and also that there is anot= her dash appearing at 8998 Hz at the same time.
=A0
Wishing you=A0all success for this fa= sinating work,
=A0
Markus (DF6NM)
=
Sent: Monday, December 27, 2010 2:10 PM
Subject: Re: LF: VLF - G3XIZ - QRT

Unfortunately taking that screen grab stopped teh SDR-IQ and I didn&#= 39;t notice for a while.=A0 Anyway, after eventually restarting there is= not even the faintest indication of a line at the appropriate spot, which= does suggest a possibility your QRSS 3600 signal =A0was detected.
=A0
Look forward to your next transmission - with slower dot period pleas= e.
=A0
Andy
=A0
=A0
On 27 December 2010 12:28, Andy Talbot <an= dy.g4jnt@gmail.com> wrote:
At what=A0time =A0did you turn off?
=A0
Take a look at http://www.g4jnt.com/DownLoad/XIZ_1.jpg=A0=A0where the= re is just the faintest line at the right frequency - looking in a bandwid= th of 0.05Hz.
=A0
(The other point labelled is wher ei inject a frequency 10Hz higher= at the start to check frequency cal)
=A0
If it is genuine, and not just a spuron, then QRSS 60 would probably= show results.
=A0
Its still running to see if that just-possible line has now clearly= gone.
=A0
Andy
=A0
=A0
On 27 December 2010 12:20, Chris Osborn <g3= xiz@yahoo.co.uk> wrote:
Thanks for your efforts chaps.

I had definite QRSS-3 confirmat= ion from Dennis M0JXM at 1.5 km but Pete M0FMT at 11 km
had no copy.
I have developed an intermittent short-circuit problem with the loadi= ng coil and will QRT now.

I'll notify via the reflector when transmitting again.

73= Chris XIZ

From: James Moritz <james.mori= tz@btopenworld.com>
To: = rsgb_lf_group@blacksheep.org
Sent: Mon, 27 December, 20= 10 11:44:17
Subject: LF= : Re: VLF - G3XIZ

Dear Chris, LF Group,

The VLF RX ha= s been running since 1130 - Nothing seen yet.

Cheers, Jim Moritz
73 de M0BMU





<= /blockquote>

--90e6ba4fc4c6a84f8504986830eb--