Return-Path: Received: from mtain-mb11.r1000.mx.aol.com (mtain-mb11.r1000.mx.aol.com [172.29.96.31]) by air-ma10.mail.aol.com (v129.4) with ESMTP id MAILINMA103-b5424d0670213a2; Mon, 13 Dec 2010 14:12:33 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb11.r1000.mx.aol.com (Internet Inbound) with ESMTP id B62A4380001EE; Mon, 13 Dec 2010 14:12:31 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PSDo2-0001K7-71 for rs_out_1@blacksheep.org; Mon, 13 Dec 2010 19:11:30 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PSDo1-0001Jy-Ib for rsgb_lf_group@blacksheep.org; Mon, 13 Dec 2010 19:11:29 +0000 Received: from mail-yx0-f171.google.com ([209.85.213.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PSDnz-0005yT-9x for rsgb_lf_group@blacksheep.org; Mon, 13 Dec 2010 19:11:29 +0000 Received: by yxi11 with SMTP id 11so3453855yxi.16 for ; Mon, 13 Dec 2010 11:11:20 -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=HtYlWABgW7bvQRaCgTHE7YDAfwpaPApZlh3Hcqqw6Vc=; b=d6Xhbz5dF3RTUuZChXdtC/Qhs9AI0bbcH5i1ObFUyow/1VgUYS/ECeJg3z4Zse8lmD YUV9hvzLXOhloltTMIGDkyGY/KxWLWCwDMyr83P3RXVkzz8LtuHzW2PCfLivQUvns14d nXruuO3aWfBMZB18VsrqvqErwFGUaiYpR76K4= 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=EUMM39mXgHZ63GtmnH/Xe5Fzt4+hnJ22CbPyWOwoMFXOe4Z3fvmtIGtLiWKGhCCSCK P/lkcSkUtRygIy4FrHpqulnbNDMxtsDRlEZxTJ3AqUBDX8OKXg4083VBFjPT8UnL7LlU OwCU431A46Q3hEEtZr52xuRaqKbjKCEJvEdGk= MIME-Version: 1.0 Received: by 10.42.176.71 with SMTP id bd7mr3173568icb.385.1292267480598; Mon, 13 Dec 2010 11:11:20 -0800 (PST) Received: by 10.42.239.71 with HTTP; Mon, 13 Dec 2010 11:11:20 -0800 (PST) In-Reply-To: <4D066C01.6080205@freenet.de> References: <4D066C01.6080205@freenet.de> Date: Mon, 13 Dec 2010 19:11:20 +0000 Message-ID: From: Roger Lapthorn 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: G3XBM - very long carrier VLF transmission test Dec 15th Content-Type: multipart/alternative; boundary=90e6ba6e8a4c22c97004974f7869 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=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-d271.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d601f4d06701e5242 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --90e6ba6e8a4c22c97004974f7869 Content-Type: text/plain; charset=ISO-8859-1 Wolf (et al) My frequency source is an HF crystal divided by 512. This is in the same box as the PA and stabilises at a temperature of about 60 deg C after about 15 minutes. Unfortunately I do not know how stable the frequency is, although I will attempt to measure this on Wednesday using Stefan's suggestion of locking Spectrum Lab to an MSK signal as I did for his recent tests. In all honesty I doubt that my signal will be detected at any range and I've not heard of anyone within possible range who will definitely be monitoring yet. 73s Roger G3XBM On 13 December 2010 18:54, wolf_dl4yhf wrote: > Hello Roger, > > Do you have an estimate about your transmitter's frequency stability (mHz > per minute or similar) ? > This would help to guesstimate a half-way matched FFT bin width, or -if you > prefer- QRSS speed index. Anyway, even for listeners/viewers in your > neighbourhood, I'd suggest to use a setting for QRSS 120, or, if > soft/hardware permits, even slower mode to sequeeze the last fraction of a > dB out of the equivalent receiver bandwidth. > > Unfortunately no good site for RX reception here, otherwise I'd like to > test a new GPS-stabilized receiver. Maybe in a few weeks, using a remote VLF > site with wideband FM link. > > Good luck with the test, > 73, Wolf DL4YHF . > > > Am 12.12.2010 23:51, schrieb Roger Lapthorn: > > This Wednesday, Dec 15th, I will run tests on *8.7608kHz* with very long > continuous TX periods of *several hours* interspersed with gaps of 0.5 to > 1 hour. Transmissions will start at 0900GMT and finish at 2300GMT. I will > reveal the TX pattern after the test so the test is done "blind". > > > I'd be most grateful if suitably equipped stations could look for any > possible signs of the signal, even though I shall only be using the 20m > spaced earth electrodes and 5W as used for my local earthmode tests. Those > able to screw the bandwidths right down may just be able to detect > something, although I think it is unlikely at any great distance. > > *15.12.10 * > *0900-2300z * > *8.7608kHz * > *Carrier "on" periods of 30mins or more* > > Good luck to anyone having a go. > > 73s > Roger G3XBM > > -- > g3xbm-qrp.blogspot.com/ > www.g3xbm.co.uk > www.youtube.com/user/g3xbm > G3XBM GQRP 1678 ISWL G11088 > > > -- g3xbm-qrp.blogspot.com/ www.g3xbm.co.uk www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --90e6ba6e8a4c22c97004974f7869 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Wolf (et al)

My frequency source is an HF crystal divided by 512.= This is in the same box as the PA and stabilises at a temperature of abou= t 60 deg C after about 15 minutes. Unfortunately I do not know how stable= the frequency is, although I will attempt to measure this on Wednesday us= ing Stefan's suggestion of locking Spectrum Lab to an MSK signal as I= did for his recent tests.

In all honesty I doubt that my signal will be detected at any range an= d I've not heard of anyone within possible range who will definitely= be monitoring yet.

73s
Roger G3XBM

On 13 December 2010 18:54, wolf_dl4yhf <dl4yhf@freenet.de> wrote:
=20 =20 =20 =20
Hello Roger,

Do you have an estimate about your transmitter's frequency stabili= ty (mHz per minute or similar) ?
This would help to guesstimate a half-way matched FFT bin width, or -if you prefer- QRSS speed index. Anyway, even for listeners/viewers in your neighbourhood, I'd suggest to use a setting for QRSS 120, or, if soft/hardware permits, even slower mode to sequeeze the last fraction of a dB out of the equivalent receiver bandwidth.

Unfortunately no good site for RX reception here, otherwise I'd li= ke to test a new GPS-stabilized receiver. Maybe in a few weeks, using a remote VLF site with wideband FM link.

Good luck with the test,
=A0 73, =A0 Wolf DL4YHF .


Am 12.12.2010 23:51, schrieb Roger Lapthorn:
This Wednesday, Dec 15th, I will run= tests on 8.7608kHz with very long continuous TX periods of several hours interspersed with gaps of 0.5 to 1 hour. Transmissions will start at 0900GMT and finish at 2300GMT. I will reveal the TX pattern after the test so the test is done "blind".


I'd be most grateful if suitably equipped stations could look fo= r any possible signs of the signal, even though I shall only be using the 20m spaced earth electrodes and 5W as used for my local earthmode tests. Those able to screw the bandwidths right down may just be able to detect something, although I think it is unlikely at any great distance.

15.12.10=A0=A0=A0=A0
0900-2300z=A0
8.7608kHz=A0=A0=A0
Carrier "on" periods of 30mins or more

Good luck to anyone having a go.

73s
Roger G3XBM

--
g3xbm-q= rp.blogspot.com/
www.g3xbm.co.uk=
www.= youtube.com/user/g3xbm
G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088




--
g3xbm-qrp.blogspot.com/
www.g3xbm.co.uk
= www.youtub= e.com/user/g3xbm
G3XBM=A0=A0 GQRP 1678= =A0=A0=A0 ISWL G11088
--90e6ba6e8a4c22c97004974f7869--