Return-Path: Received: from mtain-dl04.r1000.mx.aol.com (mtain-dl04.r1000.mx.aol.com [172.29.74.210]) by air-db03.mail.aol.com (v129.10) with ESMTP id MAILINDB031-85ef4de611c21e2; Wed, 01 Jun 2011 06:17:38 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl04.r1000.mx.aol.com (Internet Inbound) with ESMTP id C5DF238000086; Wed, 1 Jun 2011 06:17:35 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QRiTM-0005Gl-Gd for rs_out_1@blacksheep.org; Wed, 01 Jun 2011 11:16:20 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QRiTL-0005GZ-9z for rsgb_lf_group@blacksheep.org; Wed, 01 Jun 2011 11:16:19 +0100 Received: from imr-da04.mx.aol.com ([205.188.105.146]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QRiTJ-0007zR-Nr for rsgb_lf_group@blacksheep.org; Wed, 01 Jun 2011 11:16:19 +0100 Received: from imo-da04.mx.aol.com (imo-da04.mx.aol.com [205.188.169.202]) by imr-da04.mx.aol.com (8.14.1/8.14.1) with ESMTP id p51AGANn021076 for ; Wed, 1 Jun 2011 06:16:10 -0400 Received: from MarkusVester@aol.com by imo-da04.mx.aol.com (mail_out_v42.9.) id l.f2e.11c0c242 (56030) for ; Wed, 1 Jun 2011 06:16:09 -0400 (EDT) Received: from smtprly-md03.mx.aol.com (smtprly-md03.mx.aol.com [64.12.143.156]) by cia-md08.mx.aol.com (v129.10) with ESMTP id MAILCIAMD084-d4354de611624f; Wed, 01 Jun 2011 06:16:09 -0400 Received: from angweb-usd022 (angweb-usd022.sim.aol.com [205.188.103.66]) by smtprly-md03.mx.aol.com (v129.10) with ESMTP id MAILSMTPRLYMD034-d4354de611624f; Wed, 01 Jun 2011 06:16:02 -0400 To: rsgb_lf_group@blacksheep.org Date: Wed, 01 Jun 2011 06:16:02 -0400 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: Markus Vester X-MB-Message-Type: User X-Mailer: AOL Webmail 33708-STANDARD Received: from 194.138.39.59 by angweb-usd022.sysops.aol.com (205.188.103.66) with HTTP (WebMailUI); Wed, 01 Jun 2011 06:16:02 -0400 Message-Id: <8CDEE5C0B315640-6BC-35CF0@angweb-usd022.sysops.aol.com> X-Spam-Flag:NO X-AOL-SENDER: MarkusVester@aol.com X-Spam-Score: 0.7 (/) X-Spam-Report: autolearn=disabled,FORGED_AOL_TAGS=0.281,HTML_MESSAGE=0.001,HTML_TAG_EXIST_TBODY=0.126,MAILTO_TO_SPAM_ADDR=0.276,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: VLF - G3XIZ QRT - Buckets! Content-Type: multipart/alternative; boundary="--------MB_8CDEE5C0B3ADBC8_6BC_6CCA5_angweb-usd022.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=1.8 required=5.0 tests=FORGED_AOL_TAGS,HTML_20_30, HTML_FONTCOLOR_BLUE,HTML_FONTCOLOR_UNKNOWN,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY,MAILTO_TO_SPAM_ADDR 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-sid: 3039ac1d4ad24de611bf087b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ----------MB_8CDEE5C0B3ADBC8_6BC_6CCA5_angweb-usd022.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hi Chris, it's here: http://df6nm.bplaced.net/VLF/VLF_110304-06/coil_legospacers.jpg Best 73, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Dave G3WCB. An: rsgb_lf_group@blacksheep.org Verschickt: Di., 31. Mai. 2011, 21:59 Thema: LF: VLF - G3XIZ QRT - Buckets! Chris, =20 Marcus uses stacked buckets - see e-mail below. He did post a photo of his= coil, but I can't find it at the moment. =20 73, Dave G3WCB=20 =20 Dear Henny, the coil consists of seven ordinary ten-liter polypropylene household=20 buckets, inserted upside-down into one another. The diameter of the bucket= s=20 is about 25 cm at the bottom and 21 cm near the top. Each bucket carries= 460=20 turns of 0.4 mm enameled wire. The lead from the top end of one winding to= =20 th bottom end of the next has to run alomg the winding, and is insulated= =20 with several strips of tape an foam material. Total DC resistance is about= =20 320 ohms. The resonance is adjusted by the amount of overlap. Inserting the buckets= =20 deeper into one another lowers the frequency by enhancing the mutual=20 inductive coupling, along with a slightly higher inter-layer capacitance.= My=20 240 pF antenna requires a total length of about 60 cm for 9 kHz. For the= 500=20 pF kite antenna I need only five buckets, and with larger spacing. Best 73, Markus (DF6NM) -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@black= sheep.org]On Behalf Of Chris Osborn Sent: 31 May 2011 15:39 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: VLF - G3XIZ QRT - MF QRV Thank you Stefan, =20 I hope that you had a pleasant weekend and thank you for looking for the= signal. =20 I have made some aerial improvements although not as much as I had anticip= ated. I now have an inverted 'L' 48m long and with a mean height 11m I have far better insulators too. I shall do some more improvements later. =20 My loading coil became unserviceable yesterday at 06.10Z whilst transmitti= ng. I think that a flying insect hit the wires and exploded, causing a short-c= ircuit. I have had this problem before with insects with high voltages. =20 I shall try to rectify the coil and then see if my aerial shows an improve= ment in signal strength. Eddie G3ZJO picks me up regularly and his VLF grabber is most useful. =20 Has anyone an easier way of making a 1.3 H loading coil ? My present dual-overlaid winding coil took many hours to make and seems qu= ite unreliable. =20 73 Chris G3XIZ ----------MB_8CDEE5C0B3ADBC8_6BC_6CCA5_angweb-usd022.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
Hi Chris, it's here:

http://df6nm.bplaced.net/VLF/VLF_110304-06/coil_legospacers.jpg

Best 73, Markus


-----Urspr=C3=BCngliche Mitteilung-----
Von: Dave G3WCB. <ganymede444@btopenworld.com>
An: rsgb_lf_group@blacksheep.org
Verschickt: Di., 31. Mai. 2011, 21:59
Thema: LF: VLF - G3XIZ QRT - Buckets!

Chris,
 
Marcus uses stacked buckets - see e-mail below. He did post a pho= to of his coil, but I can't find it at the moment.
 
73, Dave G3WCB
 
Dear Henny,
the coil consists of seven ordinary ten-liter polypropylene household=
buckets, inserted upside-down into one another. The diameter of the= buckets
is about 25 cm at the bottom and 21 cm near the top. Each bucket carr= ies 460
turns of 0.4 mm enameled wire. The lead from the top end of one windi= ng to
th bottom end of the next has to run alomg the winding, and is insula= ted
with several strips of tape an foam material. Total DC resistance is= about
320 ohms.
The resonance is adjusted by the amount of overlap. Inserting the buc= kets
deeper into one another lowers the frequency by enhancing the mutual=
inductive coupling, along with a slightly higher inter-layer capacita= nce. My
240 pF antenna requires a total length of about 60 cm for 9 kHz. For= the 500
pF kite antenna I need only five buckets, and with larger spacing.
Best 73,
Markus (DF6NM)
-----Original Message-----
From: owner-r= sgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf= Of Chris Osborn
Sent: 31 May 2011 15:39
To: rsgb_lf_group@b= lacksheep.org
Subject: Re: LF: VLF - G3XIZ QRT - MF QRV

Thank you Stefan,
 
I hope that you had a pleasant weekend and thank you for looking for= the signal.
 
I have made some aerial improvements although not as much as I had an= ticipated.
I now have an inverted 'L'  48m long and with a mean height 11m<= /div>
I have far better insulators too.
I shall do some more improvements later.
 
My loading coil became unserviceable yesterday at 06.10Z whilst trans= mitting.
I think that a flying insect hit the wires and exploded, causing= a short-circuit.
I have had this problem before with insects with high volta= ges.
 
I shall try to rectify the coil and then see if my aerial shows= an improvement in signal strength.
Eddie G3ZJO picks me up regularly and his VLF grabber is most us= eful.
 
Has anyone an easier way of making a 1.3 H loading coil ?
My present dual-overlaid winding coil took many hours to make an= d seems quite unreliable.
 
73 Chris G3XIZ
 ----------MB_8CDEE5C0B3ADBC8_6BC_6CCA5_angweb-usd022.sysops.aol.com--