Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7331A38000087; Wed, 28 Mar 2012 02:51:31 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SCmiT-00022R-GE for rs_out_1@blacksheep.org; Wed, 28 Mar 2012 07:50:45 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SCmiS-00022I-VY for rsgb_lf_group@blacksheep.org; Wed, 28 Mar 2012 07:50:44 +0100 Received: from imr-da01.mx.aol.com ([205.188.105.143]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1SCmiQ-0001IR-7p for rsgb_lf_group@blacksheep.org; Wed, 28 Mar 2012 07:50:44 +0100 Received: from mtaomg-db05.r1000.mx.aol.com (mtaomg-db05.r1000.mx.aol.com [172.29.51.203]) by imr-da01.mx.aol.com (8.14.1/8.14.1) with ESMTP id q2S6obDL020422 for ; Wed, 28 Mar 2012 02:50:37 -0400 Received: from core-msa005c.r1000.mail.aol.com (core-msa005.r1000.mail.aol.com [172.29.233.81]) by mtaomg-db05.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id EDF8BE000081 for ; Wed, 28 Mar 2012 02:50:36 -0400 (EDT) References: <8CEDA76E04F70F0-1B04-5AAF@webmail-d082.sysops.aol.com> To: rsgb_lf_group@blacksheep.org In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: Markus Vester X-MB-Message-Type: User X-Mailer: AOL Webmail 35810-STANDARD Received: from 77.7.53.125 by webmail-d159.sysops.aol.com (205.188.252.85) with HTTP (WebMailUI); Wed, 28 Mar 2012 02:50:36 -0400 Message-Id: <8CEDAC636CB654A-A18-4C57@webmail-d159.sysops.aol.com> X-Originating-IP: [77.7.53.125] Date: Wed, 28 Mar 2012 02:50:36 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20110426; t=1332917437; bh=YqTvBocFuiqez3miq+cJdHVmeQQ09gv6/ezkcesbJRg=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=s9Htxz5Nim319ibYX7+s2GsN96sNeEgFO7mizh7TTzv95vEJXy/+VZ0KqJxoPbuZ6 FcWGrnbBvdDQomgdQ7dQyBETy+bmnuVAuvy2rPrsV4UbFrxrQrAV4raOMRYL25vI3n ZZdQYaPnX8gT3Aoc8KKGbrUVUPAoZWygcon/IFDw= X-AOL-SCOLL-SCORE: 0:2:478232640:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,FORGED_AOL_TAGS=0.281,HTML_MESSAGE=0.001,UNPARSEABLE_RELAY=0.001 Subject: Re: VLF: DF6NM on 8970.002 Content-Type: multipart/alternative; boundary="--------MB_8CEDAC636D74C25_A18_13F30_webmail-d159.sysops.aol.com" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=FORGED_AOL_TAGS,HTML_20_30, HTML_FONTCOLOR_UNKNOWN,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-SCORE: 0:2:493251904:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d018.2 ; domain : mx.aol.com DKIM : pass x-aol-sid: 3039ac1d410e4f72b4f35ec9 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ----------MB_8CEDAC636D74C25_A18_13F30_webmail-d159.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The carrier was on air continuously from 20:26 to 6:36 this morning. Thanks very much to Lubos, as well as to all other live grabber operators. = As far as I can see, traces appeared at DK7FC, G3ZJO, OK2BVG, and Paul Nich= olson. Best 73, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Lubos OK2BVG An: _RSGB_LF Verschickt: Mi, 28 Mrz 2012 4:24 am Betreff: RE: VLF: DF6NM on 8970.002 Hello Markus, VLF! Your signal is nice visible on my grabber in QRSS6000 and traces in QRSS600= . In the 6000 window is evident, that we did our VLF QSO in time, when the = noise conditions were not the best.=20 I have written an article about our qso in Czech. It will be publised in a = ham magazine "Radioamater", common known in The Czech and Slovak republic. = Some hams would be encouraged to find VLF band by the report. :-) 73! Lubos, OK2BVG To: rsgb_lf_group@blacksheep.org From: markusvester@aol.com Date: Tue, 27 Mar 2012 17:22:42 -0400 Subject: VLF: DF6NM on 8970.002 It's a beautiful night! At 20:25, I have started up a straight carrier on 8= 970.002 Hz (DHO locked). If all stays well I will leave it on until after s= unrise. =20 An interesting observation on the side: In the first few minutes, I drove t= he amp up to 400 mA antenna current. A little corona became visible near th= e ends of two of the three topload wires - it wasn't very bright, not unlik= e 3rd magnitude stars when viewed from the ground 10 m below. But the 9 kHz= sound from antenna itself could be heard quite loudly, which is a potentia= l cause for neighbourhood trouble.=20 =20 Then I reduced the drive to 350 mA where the corona disappeared completely.= So did the noise, the antenna became absolutely quiet! All that was left w= as a little noise from the coil in the dustbin on the balcony, and the tran= sformer indoors. Thus the predominant cause for a squeaking antenna must be= corona. The fact that it can be heard at 9 rather than 18 kHz demonstrates= that the discharge must have an asymmetric dependence on the voltage polar= ity. =20 At the same time, wideband electrical noise on the nearby LF grabber antenn= a went down by 20 dB.=20 =20 BTW If you like you can actually read my VLF frequency from an alias line o= n the LF TA grabber: It is created by the 24th VLF harmonic, intermodulatin= g with DCF 77, thus appearing on 24 x 8970.002 - 77500 =3D 137780.048 Hz. =20 Best regards, Markus (DF6NM) ----------MB_8CEDAC636D74C25_A18_13F30_webmail-d159.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
The carrier was on air continuously from 20:26 to 6:36 this = morning.
 
Thanks very much to Lubos, as well as to all other live grabber o= perators. As far as I can see, traces appeared at DK7FC, G3ZJO, OK2BVG= , and Paul Nicholson.
Best 73,
Markus
 
= -----Urspr=C3=BCngliche Mitteilung-----
Von: Lubos OK2BVG <bvgbob@hotmail.com>
An: _RSGB_LF <rsgb_lf_group@blacksheep.org>
Verschickt: Mi, 28 Mrz 2012 4:24 am
Betreff: RE: VLF: DF6NM on 8970.002

Hello Markus, VLF!
Your signal is nice visible on my grabber in QRSS6000 and traces in QR= SS600. In the 6000 window is evident, that we did our VLF QSO in time, when= the noise conditions were not the best. 
I have written an article about our qso in Czech. It will be publised = in a ham magazine "Radioamater", common known in The Czech and Slovak repub= lic. Some hams would be encouraged to find VLF band by the report. :-)

73!

Lubos, OK2BVG

To: rsgb_lf_group@blackshee= p.org
From: markusvester@aol.com
Date: Tue, 27 Mar 2012 17:22:42 -0400
Subject: VLF: DF6NM on 8970.002

It's a beautiful night! At 20:25, I have started up a straight carrier= on 8970.002 Hz (DHO locked). If all stays well I will leave it on until af= ter sunrise.
 
An interesting observation on the side: In the first few minutes, I dr= ove the amp up to 400 mA antenna current. A little corona became visible ne= ar the ends of two of the three topload wires - it wasn't very bright, not = unlike 3rd magnitude stars when viewed from the ground 10 m below. But= the 9 kHz sound from antenna itself could be heard quite loudly, whic= h is a potential cause for neighbourhood trouble.
 
Then I reduced the drive to 350 mA where the corona disappeared comple= tely. So did the noise, the antenna became absolutely quiet! All that = was left was a little noise from the coil in the dustbin on the balcon= y, and the transformer indoors. Thus the predominant cause for a squea= king antenna must be corona. The fact that it can be heard at 9 rather= than 18 kHz demonstrates that the discharge must have = an asymmetric dependence on the voltage polarity.
 
At the same time, wideband electrical noise on the nearby LF grabber a= ntenna went down by 20 dB.
 
BTW If you like you can actually read my VLF frequency from an&nb= sp;alias line on the LF TA grabber: It is created by the 24th VLF harmonic,= intermodulating with DCF 77, thus appearing on 24 x 8970.002 - 7= 7500 =3D 137780.048 Hz.
 
Best regards,
Markus (DF6NM)
 ----------MB_8CEDAC636D74C25_A18_13F30_webmail-d159.sysops.aol.com--