Return-Path: Received: from mtain-mg06.r1000.mx.aol.com (mtain-mg06.r1000.mx.aol.com [172.29.96.206]) by air-dc06.mail.aol.com (v127_r1.1) with ESMTP id MAILINDC064-86a44b957caa160; Mon, 08 Mar 2010 17:39:38 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mg06.r1000.mx.aol.com (Internet Inbound) with ESMTP id E4D5238000230; Mon, 8 Mar 2010 17:39:36 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Nolap-0002YZ-6y for rs_out_1@blacksheep.org; Mon, 08 Mar 2010 22:38:31 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Nolao-0002YQ-JK for rsgb_lf_group@blacksheep.org; Mon, 08 Mar 2010 22:38:30 +0000 Received: from mail-bw0-f215.google.com ([209.85.218.215]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Nolak-000615-G8 for rsgb_lf_group@blacksheep.org; Mon, 08 Mar 2010 22:38:30 +0000 Received: by bwz7 with SMTP id 7so4963698bwz.4 for ; Mon, 08 Mar 2010 14:38:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=u2sG3xr3uYuoaBfoJtZzi+jJVlhN5mhI+0kvPlIqaJU=; b=Zz23jNURK9a7zEeXqGiS/IWV0FXh9hQZ3UOlc89+BOkqYiwmvf7r9nAFRYQhNXELKO coXAiQ+fyhDRtx/psZndenkDd1CRQD1HsW4ToVjhCddjaVI2/rHC9pnv7vBMvmzpvD7c mdSqOmi9DdbbIYmsDBX4UZKvbwQ8/hkHQK7No= 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=Nn5JGsgg9UhyYvzbp7l/EARvGNkumX9IdoC/9xhuPEReHO3wB+oSOAoCSwjJjAwuNp OCqt6bKeD7vC3kFd2rm4zI/JJwNMZ/Y8cXqRfN3nIgZqq/+ua1ONBaiUYI/iPcUct2A1 af52RmIIeG0DT8Z4v9bc6OylKjX/oyOIZ+Hqs= MIME-Version: 1.0 Received: by 10.204.140.18 with SMTP id g18mr6078959bku.47.1268087896853; Mon, 08 Mar 2010 14:38:16 -0800 (PST) In-Reply-To: References: Date: Mon, 8 Mar 2010 22:38:16 +0000 Message-ID: <9afca2641003081438l4a7a3c42t43b7e35ebb6c5718@mail.gmail.com> 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: VLF Content-Type: multipart/alternative; boundary=0015174c3b0ea2ceb6048151b80e 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-m275.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60ce4b957ca8625f X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --0015174c3b0ea2ceb6048151b80e Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable As a matter of interest, I wonder how many people in the UK have applied= for a <9kHz NoVs so far since my note about OFCOM's willingness to seriously consider these a few weeks ago? I hope to submit my application this week. My best attempts and modest power levels are unlikely to result in much radiated power at all, but I'm following with great interest the German experiments by Marcus and others. There is little doubt that some records will tumble when they optimise their systems. Good luck. 73s Roger G3XBM On 8 March 2010 18:42, Andy Talbot wrote: > ...wishing I'd persued the NoV application a few years ago instead of ju= st > letting it slide into oblivion... > > Has anyone yet tried a ground loop at 9kHz? That was going to be my fi= rst > (and probably only) antenna type, running a length of wire as far away= from > the house as I could get-away with and connecting it to a ground stake,= then > feeding this against the existing local earth. I never got round to ma= king > measurements to see what sort of ground resistance might be > expected, but that would have been a lot easier than winding 1.4H air wo= und > chokes. > > My house backs onto a main road, and there is a drainage ditch running > behide trees and foliage running for about 70m in one direction that wou= ld > have made a useful route to hide a wire in. Might have been interesting > hammering in a ground stake next to the footpath at the corner of the > next road though ! > > Andy > www.g4jnt.com > > > 2010/3/8 Wolfgang B=FCscher > >> Hi Stefan, >> >> >> A VLF grabber would be very fine! If you can arrange that, it would >>> perhaps be a motivation for the dreamers ;-) >>> >>> >> Well there are two now (Markus' and Paul's) .. I will try to add a thir= d >> but need to get away from the local QRM. The plan is to use an UHF FM= link >> to the remote, battery-powered site but there are some issues to be sol= ved - >> one of them is the lack of dynamic range of the FM transmitter/receiver= , so >> I may have to add some analog bandpass filtering before the FM modulato= r >> (which would render it useless for broadband VLF signals, especially na= tural >> radio signals..). >> >> Will keep you informed, when/where another VLF 'live spectrogram' goes >> online. >> >> Cheers, >> Wolf . >> >> >> > --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/G3XBM G3XBM GQRP 1678 ISWL G11088 --0015174c3b0ea2ceb6048151b80e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable As a matter of interest, I wonder how many people in the UK have applied= for a <9kHz NoVs so far since my note about OFCOM's willingness to= seriously consider these a few weeks ago? I hope to submit my application= this week.

My best attempts and modest power levels are unlikely to result in muc= h radiated power at all, but I'm following with great interest the Ger= man experiments by Marcus and others. There is little doubt that some reco= rds will tumble when they optimise their systems. Good luck.

73s
Roger G3XBM



On 8 Marc= h 2010 18:42, Andy Talbot <andy.g4jnt@googlemail.com> wrote:
...wishing I'd persued=A0the NoV application a few years ago inst= ead of just letting it slide into oblivion...
=A0
Has anyone yet tried a ground loop at 9kHz?=A0=A0 That was going to= be my first (and probably only) antenna type, running a length of wire as= far away from the house as I could get-away with and connecting it to a= ground stake, then feeding this against the existing local earth.=A0=A0= I never got round to=A0making measurements to see what sort of ground res= istance might be expected,=A0but=A0that would have been a lot easier than= winding 1.4H air wound chokes.
=A0
My house backs onto a main road, and there is a drainage ditch runnin= g behide trees and foliage running for about 70m in one direction that wou= ld have made a useful route to=A0hide=A0a wire in.=A0 Might have been inte= resting hammering in a ground stake=A0next to the footpath at the corner= of the next=A0road though !
2010/3/8 Wolfgang B=FCscher &= lt;dl4yhf@freenet.d= e>
Hi Stefan,
<= br>
A VLF grabber= would be very fine! If you can arrange that, it would perhaps be a motiva= tion for the dreamers ;-)
=A0
Well there are two now (Markus' and Paul's) ..= I will try to add a third but need to get away from the local QRM. The pl= an is to use an UHF FM link to the remote, battery-powered site but there= are some issues to be solved - one of them is the lack of dynamic range= of the FM transmitter/receiver, so I may have to add some analog bandpass= filtering before the FM modulator (which would render it useless for broa= dband VLF signals, especially natural radio signals..).

Will keep you informed, when/where another VLF 'live spectrogram&#= 39; goes online.

Cheers,
=A0Wolf .






--

http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/G3XBM
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
--0015174c3b0ea2ceb6048151b80e--