Return-Path: Received: from mtain-me11.r1000.mx.aol.com (mtain-me11.r1000.mx.aol.com [172.29.96.147]) by air-df02.mail.aol.com (v129.4) with ESMTP id MAILINDF024-5ee94d1e2fbf116; Fri, 31 Dec 2010 14:32:15 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 37C4038000099; Fri, 31 Dec 2010 14:31:55 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PYkgp-0006c1-7U for rs_out_1@blacksheep.org; Fri, 31 Dec 2010 19:31:03 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PYkgo-0006bs-Mf for rsgb_lf_group@blacksheep.org; Fri, 31 Dec 2010 19:31:02 +0000 Received: from mail-iw0-f171.google.com ([209.85.214.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PYkgl-0000Cw-Vm for rsgb_lf_group@blacksheep.org; Fri, 31 Dec 2010 19:31:02 +0000 Received: by iwn2 with SMTP id 2so11961594iwn.16 for ; Fri, 31 Dec 2010 11:30:58 -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=O2rVA6JxrHIhFbGkKUUMGGklZRfL+VbJlx3s0BYc2u4=; b=I5J1NyrTUtmDuxQ/VispGjYPibr9HI0mPiQimGHxKAaHsRDsXFjjuYz/V20ADk9Qgd ovVOZ7mpb+HEZF/H/d9gpV0SNbUxHKyZt/4NAZNWVCzqR2Nnnyd1iX6hGduvn8Pd0Q91 3S/Tt/u4gG1XbWa8VKT4OSHwh+gR9+0i4mf28= 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=t9kiMGoph8DkcT4fcEB35H/JsYU6CBfKuZSOpFFjZp7NVoc91lrDHWtnn2wFFkx7TT A3OhOrai2kpLq8uM5QZJpKQSfkrPs/ab1+5FNGYu7sFHqdkYl31SwE30mBbuIWd3ueKf qx247SbRkrUdrPa+eDnq+TgfSGO23B/8RxAD4= MIME-Version: 1.0 Received: by 10.231.207.73 with SMTP id fx9mr7118116ibb.137.1293823858420; Fri, 31 Dec 2010 11:30:58 -0800 (PST) Received: by 10.231.200.211 with HTTP; Fri, 31 Dec 2010 11:30:58 -0800 (PST) In-Reply-To: References: <11250.89514.qm@web28501.mail.ukl.yahoo.com> <4D1DC897.2060606@iup.uni-heidelberg.de> <76636.6973.qm@web28508.mail.ukl.yahoo.com> <1567AC3A96624647ADC1F52EF1A1E625@JimPC> <732174.92691.qm@web28506.mail.ukl.yahoo.com> <6DEB3BAD63314CE598337148AF10CAE0@JimPC> <6FF03593-9C77-4457-B506-F03ABCFE9FFE@gmail.com> Date: Fri, 31 Dec 2010 19:30:58 +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 Content-Type: multipart/alternative; boundary=90e6ba53a55e7badbd0498b9d7d2 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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-m240.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60934d1e2fab35da X-AOL-IP: 195.171.43.25 X-Mailer: Unknown (No Version) --90e6ba53a55e7badbd0498b9d7d2 Content-Type: text/plain; charset=ISO-8859-1 Likewise. Nothing here in IO90IV58 at 145km. Perhaps not too surprising considering Jim's measured levels. Andy www.g4jnt.com On 31 December 2010 19:18, Gary - G4WGT wrote: > Hi Chris, > > Well done & congratulations. As expected nothing seen here in IO83qo but it > was interesting watching the progress & reading all the mail. > > 73, > > Gary - G4WGT - IO83qo. > > LF MF Grabber - Web > Site - Blogspot > - 9kHz Grabber > > > > > On 31 December 2010 18:23, Roger Lapthorn wrote: > >> Congratulations Chris! I will have to add this new UK VLF record to my >> sub-9kHz webpage. If Jim can copy then I should be able to as well with a >> better set-up. So pleased for you. Brilliant. >> >> 73s >> Roger G3XBM >> >> Sent from my iPod Touch 4g >> >> On 31 Dec 2010, at 17:45, "James Moritz" >> wrote: >> >> > Dear Chris, LF Group, >> > >> > The signal disappeared some time around 1520utc - the complete trace is >> shown in the attachment. >> > >> > I made an estimate of the field strength of your signal by injecting a >> test signal at a known EMF into the loop antenna, and comparing with the >> level of your signal. The received FS at the strongest point (around >> 1330utc) worked out to be 1.8uV/m. Taking the distance between our locations >> as 37km, your ERP would have been 87uW. The SNR at best was around 15dB, >> making the noise level 0.32uV/m in the FFT noise bandwidth of 2.1mHz, or a >> noise density of 7uV/m per sqrt(Hz) >> > >> > Assuming a 50m vertical wire (heff ~ 25m), Rrad of your antenna at >> 8.97kHz would be 880micro-ohms. Assuming 2.62dB directivity for an >> electrically short monopole compared to a dipole, and Iant of 200mA, the >> calculated value of ERP would then be 64uW. So there is reasonable agreement >> between these two calculations, the difference only being 1.3dB. >> > >> > Thanks for the tests, >> > >> > Cheers, Jim Moritz >> > 73 de M0BMU >> > >> >> > > > -- > > > --90e6ba53a55e7badbd0498b9d7d2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Likewise.=A0
=A0
Nothing here in IO90IV58 at 145km.
Perhaps not too surprising considering Jim's measured levels.
=A0
Andy
On 31 December 2010 19:18, Gary - G4WGT <g4wgt@tiscali.co.u= k> wrote:
Hi Chris,=20

Well done & congratulations. As expected nothing seen here in IO8= 3qo but it was interesting watching the progress & reading all the mai= l.

73,=20

Gary - G4WGT - IO83qo.

LF MF Grabber=A0-=A0Web Site=A0-=A0Blogspot=A0-=A09kHz= Grabber




On 31 December 2010 18:23, Roger Lapthorn <rogerlapthorn@gmail.com> wrote:
Congratulations Chris! I will= have to add this new UK VLF record to my sub-9kHz webpage. If Jim can cop= y then I should be able to as well with a better set-up. So pleased for yo= u. Brilliant.

73s
Roger G3XBM

Sent from my iPod Touch 4g

On 31 Dec 2010, at 17:45, "James Moritz" <james.moritz@btope= nworld.com> wrote:

> Dear Chris, LF Group,
>
>= ; The signal disappeared some time around 1520utc - the complete trace is= shown in the attachment.
>
> I made an estimate of the field strength of your signal by in= jecting a test signal at a known EMF into the loop antenna, and comparing= with the level of your signal. The received FS at the strongest point (ar= ound 1330utc) worked out to be 1.8uV/m. Taking the distance between our lo= cations as 37km, your ERP would have been 87uW. The SNR at best was around= 15dB, making the noise level 0.32uV/m in the FFT noise bandwidth of 2.1mH= z, or a noise density of 7uV/m per sqrt(Hz)
>
> Assuming a 50m vertical wire (heff ~ 25m), =A0Rrad of your an= tenna at 8.97kHz would be 880micro-ohms. Assuming 2.62dB directivity for= an electrically short monopole compared to a dipole, and Iant of 200mA,= the calculated value of ERP would then be 64uW. So there is reasonable ag= reement between these two calculations, the difference only being 1.3dB. >
> Thanks for the tests,
>
> Cheers, Jim Moritz
&= gt; 73 de M0BMU
> <Dec31_08.jpg>




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