Return-Path: Received: from mtain-dd09.r1000.mx.aol.com (mtain-dd09.r1000.mx.aol.com [172.29.64.149]) by air-mc08.mail.aol.com (v129.4) with ESMTP id MAILINMC082-a98c4cb29d293e5; Mon, 11 Oct 2010 01:14:18 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6D8DF38000088; Mon, 11 Oct 2010 01:14:16 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1P5AgG-0003Nt-5k for rs_out_1@blacksheep.org; Mon, 11 Oct 2010 06:12:12 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1P5AgF-0003Nk-Bi for rsgb_lf_group@blacksheep.org; Mon, 11 Oct 2010 06:12:11 +0100 Received: from nm28.bullet.mail.ne1.yahoo.com ([98.138.90.91]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1P5AgD-0004KF-5U for rsgb_lf_group@blacksheep.org; Mon, 11 Oct 2010 06:12:11 +0100 Received: from [98.138.90.50] by nm28.bullet.mail.ne1.yahoo.com with NNFMP; 11 Oct 2010 05:12:01 -0000 Received: from [98.138.88.233] by tm3.bullet.mail.ne1.yahoo.com with NNFMP; 11 Oct 2010 05:12:01 -0000 Received: from [127.0.0.1] by omp1033.mail.ne1.yahoo.com with NNFMP; 11 Oct 2010 05:12:00 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 882664.52310.bm@omp1033.mail.ne1.yahoo.com Received: (qmail 73489 invoked by uid 60001); 11 Oct 2010 05:12:00 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1286773919; bh=swpkJL8olEtuJvkmPYcZhPrYQMldI6FZmDGG+uKcLr8=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=5/O5ahKe6+TA9JTUOEwHHhJ/H8oAl24jzOQviNhZ1TNPD24ErstUOYBTqjTL5xWqMiQaUqUUlrq6mzrTp5uZhICjYxcc7B9091Hj6a1J6e2nzEGJVi0g2nsnjXb6tGmvwgVvRqGcRS7VfK7B+IKH3k2sO/mX9ecVvoEh3yiFQoI= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=oPV0nPp9Xph5Gjo2E3gT53XAfUOHzzogu3OGIXkijwyrMXt5/zAfluLKer4kiCiSjs193yRM1QbLZslwxGyRS+ZVQN9q9YjTa1bw67L/153f0YjFUCLgkfLIFaAg9loKI3xhSPNGbujX9qkia+YPuOo6DT6XYUmBxd1mh/Bwuhw=; Message-ID: <925002.67866.qm@web111913.mail.gq1.yahoo.com> X-YMail-OSG: Yz6qPDMVM1mBLXnbCtXIJkKxtzVGYtOdKy7ikObEz6cTT14 s3ARlt0LUoObM.O_clknKQhJlyOp_m1WC4wowIcdXPMt6DEljDkiiqfjyjuO DHJV9c0ZYjTiYec.Kxgf1OTz3ltoVVFSEvZaLlIkyWE7XJiPSYzyTtYVID6c m0_g.tI0VdHERdVWLW5u0MHX5mILGp6_ZjBPPi4UqD2tIQr7NIv1TNx9X9CS 9ECk7cVIHqa5wtgq8g5CtEfH9mEKYt7.HZZ.kl1ceD9dDTKeHmLj99cijxTA rep846VM- Received: from [87.3.206.48] by web111913.mail.gq1.yahoo.com via HTTP; Sun, 10 Oct 2010 22:11:59 PDT X-Mailer: YahooMailRC/504.5 YahooMailWebService/0.8.106.282862 References: <166307.34130.qm@web28104.mail.ukl.yahoo.com> Date: Sun, 10 Oct 2010 22:11:59 -0700 (PDT) From: Daniele Tincani To: rsgb_lf_group@blacksheep.org In-Reply-To: <166307.34130.qm@web28104.mail.ukl.yahoo.com> MIME-Version: 1.0 DomainKey-Status: good (testing) X-Spam-Score: 1.5 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,HTML_TAG_EXIST_TBODY=0.126,RCVD_IN_BL_SPAMCOP_NET=1.332 Subject: Re: VLF: Transmit hardware Content-Type: multipart/alternative; boundary="0-386839477-1286773919=:67866" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.4 required=5.0 tests=FORGED_YAHOO_RCVD,HTML_30_40, HTML_MESSAGE,HTML_TAG_EXISTS_TBODY 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-d305.1 ; domain : yahoo.com DKIM : pass x-aol-sid: 3039ac1d40954cb29d276b87 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --0-386839477-1286773919=:67866 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Station on 18KHz could be Russian RDL (18.1KHz) which at times transmit CW= =20 messages like this one: "RDL RDL 85690 92256 85690 92256 85690 92256 K". Regards Daniele ________________________________ From: M0FMT To: rsgb_lf_group@blacksheep.org Sent: Mon, October 11, 2010 12:44:40 AM Subject: Re: VLF: Transmit hardware Hi Markus Great development work always the unexpected in the best planning. In UK 405 line TV was notorious for the 10kc/s whistle from the LOPTI (405= x25=20 [interlaced] frame TB =3D 10125Hz) and even the modern 625 lineTV=A0is /= was=20 noticable at around 15kc/s (kHz) by the younger generation with good ears.= ..=20 ;-)=A0=A0=A0 So, yes I can understand the issue now you bring it up. BTW I have been looking with Sound card RX and LW but seem to be getting= odd=20 effects new to me BC AM break thro -=A0also not seeing any Alpha stations?= The big=20 Mil stations are visible with a station on 18kc/s transmitting 12wpm CW at= times=20 then TTY and other phase shift transmissions..... the CW always ends with= a K as=20 though inviting a reply. Thanks for your efforts Markus. 73 es GL petefmt I support www.NotSpotTelecom.Com your community Telco / ISP. --- On Sun, 10/10/10, Markus Vester wrote: >From: Markus Vester >Subject: Re: VLF: Transmit hardware >To: rsgb_lf_group@blacksheep.org >Date: Sunday, 10 October, 2010, 11:20 > > >I got a complaint from the neighbourhood about acoustic radiation from th= e coil!=20 >So I=A0interrupted the carrier for a few minutes around 12:35 and improvi= sed a=20 >foam package for noise mitigation. >=A0 >BTW It is quite remarkable that=A0an air coil vibrates at=A09 kHz and not= 18 kHz, as=20 >Lorentz forces between windings should be a purely quadratic effect. I pr= esume=20 >that the vibration is induced by the earth field - at only 50 uT it's ama= zing=20 >how strong the effect still is! The loudest part of the setup is the ferr= ite=20 >transformer, probably due to magnetostriction, with bias from=A0some rema= nent core=20 >magnetisation. >=A0 >Best wishes for a quiet Sunday, >=A0 >MArkus (DF6NM) >=A0 >=A0 >----- Original Message -----=20 >>From: M0FMT=20 >>To: rsgb_lf_group@blacksheep.org=20 >>Sent: Sunday, October 10, 2010 12:02 AM >>Subject: Re: VLF: Transmit hardware >> >> >>... >>XYL has warned no coils on the roof here!............. hee.=20 >>=20 =20 --0-386839477-1286773919=:67866 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Station on 18KHz could be Russian RDL (18.1KHz) which at times= transmit CW messages like this one: "RDL RDL 85690 92256 85690 92256 8569= 0 92256 K".
Regards
Daniele
=
From: M0FMT <m0fmt@yaho= o.co.uk>
To: rsgb_lf= _group@blacksheep.org
Sent:= Mon, October 11, 2010 12:44:40 AM
Subject: Re: VLF: Transmit hardware

Hi Markus
 
Great development work always the unexpected in the best planning.
 
In UK 405 line TV was notorious for the 10kc/s whistle from the LOPTI= (405x25 [interlaced] frame TB =3D 10125Hz) and even the modern 625 lineTV=  is / was noticable at around 15kc/s (kHz) by the younger generation= with good ears... ;-)   
 
So, yes I can understand the issue now you bring it up.
 
BTW I have been looking with Sound card RX and LW but seem to be gett= ing odd effects new to me BC AM break thro - also not seeing any Alph= a stations? The big Mil stations are visible with a station on 18kc/s tran= smitting 12wpm CW at times then TTY and other phase shift transmissions...= .. the CW always ends with a K as though inviting a reply.
 
Thanks for your efforts Markus.

73 es GL petefmt

I supp= ort www.NotSpot= Telecom.Com your community Telco / ISP.

--- On Sun, 10/10/10= , Markus Vester <markusvester@aol.com> wrote:

From: Markus Vester <markusvester@aol.com&g= t;
Subject: Re: VLF: Transmit hardware
To: rsgb_lf_group@blacksheep.= org
Date: Sunday, 10 October, 2010, 11:20

I got a complaint from the neighbourhood= about acoustic radiation from the coil! So I interrupted the carrier= for a few minutes around 12:35 and improvised a foam package for noise mi= tigation.
 
BTW It is quite remarkable that an= air coil vibrates at 9 kHz and not 18 kHz, as Lorentz forces between= windings should be a purely quadratic effect. I presume that the vibratio= n is induced by the earth field - at only 50 uT it's amazing how strong th= e effect still is! The loudest part of the setup is the ferrite transforme= r, probably due to magnetostriction, with bias from some remanent cor= e magnetisation.
 
Best wishes for a quiet Sunday,
 
MArkus (DF6NM)
 
 
----- Original Message -----
From: M0FMT
Sent: Sunday, October 10, 2010 12:0= 2 AM
Subject: Re: VLF: Transmit hardware=

...
XYL has warned no coils on the roof here!............. hee.


<= br> --0-386839477-1286773919=:67866--