Return-Path: Received: from mtain-mi05.r1000.mx.aol.com (mtain-mi05.r1000.mail.aol.com [172.21.131.163]) by air-mc05.mail.aol.com (v129.4) with ESMTP id MAILINMC054-a96a4cebba8032d; Tue, 23 Nov 2010 07:58:40 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mi05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0B42538000105; Tue, 23 Nov 2010 07:58:38 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PKsQq-000584-4N for rs_out_1@blacksheep.org; Tue, 23 Nov 2010 12:57:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PKsQp-00057v-9q for rsgb_lf_group@blacksheep.org; Tue, 23 Nov 2010 12:57:11 +0000 Received: from nm5.bullet.mail.ukl.yahoo.com ([217.146.182.226]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PKsQp-0004Lx-7w for rsgb_lf_group@blacksheep.org; Tue, 23 Nov 2010 12:57:11 +0000 Received: from [217.146.183.184] by nm5.bullet.mail.ukl.yahoo.com with NNFMP; 23 Nov 2010 12:57:05 -0000 Received: from [217.146.183.161] by tm15.bullet.mail.ukl.yahoo.com with NNFMP; 23 Nov 2010 12:57:05 -0000 Received: from [127.0.0.1] by omp1002.mail.ukl.yahoo.com with NNFMP; 23 Nov 2010 12:57:05 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 559316.26073.bm@omp1002.mail.ukl.yahoo.com Received: (qmail 40045 invoked by uid 60001); 23 Nov 2010 12:57:05 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1290517025; bh=wqnSTomdCjNx8Sn50z+2QdtldKIYd2OtG8nkgqYxRo4=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=cGgwsM2+BdqAoktKOdxb34p7R6pyh5ZrZQUEJvZ+vQoyLC2To7A+h0nZHKMj5nwTLvvat/n1SQjB+HmM2OZ5AMDnWdzgi0ps89CaozjxlNcSYNiWQxxYJ5TP1ChZwNdma9vP6IGUxmEM/HwMme0sn7KuExWELlikQWXxJBPHaZ0= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=CLgXCuvhm676VkcHgMwNFmkl+GgdFZYAP1hnNAjhIZuG6Rt+AZUNlNJTJslSsOuTAskakkdETZeh66YEXU/oXT9kVN/aXg58JLw5KgyqMPXw2IzP4ygiCytk51tLc1NGitgMeUigm+Fo0HUAUT2gh54GOsrBqvH9nDqkVHRVidk=; Message-ID: <294616.39798.qm@web28506.mail.ukl.yahoo.com> X-YMail-OSG: f2GFBDQVM1npILjVFVh4UrQ8roW5aSy_wPiwCMe5nq_fBhm bdycWwN1HW5bNwR.1oQSYH1mdkB8Mt_2BRUJlh7hOnxOOdQ49CvLsPbRk7uF 4ZXXdbbOKfUSbAw0NNdr9AY2ewMkIWcKeRSA1RL8rmecPtKDBWW9ltpWtu0O UhrlWScctN_x05sOe5T1k1ctWEuxgAWfBIKqJqTK3DYLXG949xfjLgyCuVdh f0njAuZ7S4U1PoiiHeSPcC36EJ.UwF1lsDiRqo8TOYFp1Bkh3mDQ44YngaUO pbAhQybc5CEyt7KfPnfTP5A-- Received: from [194.62.210.50] by web28506.mail.ukl.yahoo.com via HTTP; Tue, 23 Nov 2010 12:57:04 GMT X-Mailer: YahooMailRC/553 YahooMailWebService/0.8.107.285259 References: <373372.70115.qm@web28506.mail.ukl.yahoo.com> <4CEAE16C.5030101@iup.uni-heidelberg.de> Date: Tue, 23 Nov 2010 12:57:04 +0000 (GMT) From: Chris Osborn To: rsgb_lf_group@blacksheep.org In-Reply-To: <4CEAE16C.5030101@iup.uni-heidelberg.de> MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: Re: LF: VLF G3XIZ - QRT Content-Type: multipart/alternative; boundary="0-1046454847-1290517024=:39798" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40, HTML_FONTCOLOR_UNSAFE,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-m251.1 ; domain : yahoo.co.uk DKIM : pass x-aol-sid: 3039400cdecd4cebba7e4255 X-AOL-IP: 195.171.43.25 --0-1046454847-1290517024=:39798 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hello Stefan / LF, All was going last night well until I=A0heard sparking from the aerial=20 distribution box each time the carrier was turned off. After about 45 minutes the PA FET's blew up. I did some investigation and found that the output transformer has=20 developed=A0some short-circuited turns and so is now useless. The loading coil seems unharmed so once I get a replacement transformer an= d=20 connect=A0in some=20 new FET's I'll be back in business. I'll=A0slow down=A0the rise and fall times of the pulse train from the dri= ver unit=20 to the FET's and hopefully cure the sparking. (Mal)=20 Yes,=A0N.O.V. holders=A0must get prior permission before=A0they transmit= and must stay=20 by the telephone for the duration. Thanks to all those who looked for my signals. 73=20 Chris G3XIZ =A0 ________________________________ From: Stefan Sch=E4fer To: rsgb_lf_group@blacksheep.org Sent: Mon, 22 November, 2010 21:32:28 Subject: Re: LF: VLF G3XIZ - QRT Hi Chris, Sorry to hear that. Just checked to mails after beeing abscent the weekend= and=20 wanted to wish good luck too now but just read your mail below. I assume the breakdown immediately de-tuned your system which reduced the= HV? So=20 the damage is limited to a few turns? Has it happened at the 0.2mm dia wir= e? BTW i am using 0.4mm dia wire, so not really much more... Good luck in the next tests! 73, Stefan Am 22.11.2010 22:15, schrieb Chris Osborn:=20 Thanks for looking Roger and chaps but game's over for tonight. > >I've insulation breakdown somewhere in the aerial circuit and I can't fix= it=20 >until daylight. > >Maybe try again next weekend. > >73 Chris G3XIZ > > > > > > ________________________________ From: Roger Lapthorn >To: rsgb_lf_group@blacksheep.org; Chris Osborn >Sent: Mon, 22 November, 2010 20:49:24 >Subject: Re: LF: G3XIZ - no copy yet on 8.9719kHz > >Just swapped from the loop to the earth electrode - band noise stronger= - and=20 >there may be a hint of a signal on Chris's frequency. > >73s >Roger G3XBM > > >On 22 November 2010 20:21, Roger Lapthorn wrote= : > >Have been looking for 20 minutes so far but nothing seen from Chris at ab= out=20 >34km distance. >> >>Will continue to look for the next 2 hours. >> >>73s >>Roger G3XBM >> >>--=20 >>http://g3xbm-qrp.blogspot.com/ >>http://www.g3xbm.co.uk >>http://www.youtube.com/user/g3xbm >>G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088 >> > > >--=20 >http://g3xbm-qrp.blogspot.com/ >http://www.g3xbm.co.uk >http://www.youtube.com/user/g3xbm >G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088 > > =20 --0-1046454847-1290517024=:39798 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hello Stefan / LF,
 
All was going last night well until I heard sparking from the ae= rial distribution box each
time the carrier was turned off.
 
After about 45 minutes the PA FET's blew up.
 
I did some investigation and found that the output transformer has de= veloped some
short-circuited turns and so is now useless.
 
The loading coil seems unharmed so once I get a replacement transform= er and connect in some
new FET's I'll be back in business.
 
I'll slow down the rise and fall times of the pulse train= from the driver unit to the FET's and hopefully cure the sparking.
 
(Mal)
Yes, N.O.V. holders must get prior permission before t= hey transmit and must stay by the telephone for the duration.
 
Thanks to all those who looked for my signals.
 
73
Chris G3XIZ
 

 
=
From: Stefan Sch=E4fer <= ;schaefer@iup.uni-heidelberg.de>
Sent: Mon, 22 November, 2010 21:32:28
Subject: Re: LF: VLF G3XIZ - QRT
Hi Chris,

Sorry to hear that. Just checked to mails af= ter beeing abscent the weekend and wanted to wish good luck too now but ju= st read your mail below.
I assume the breakdown immediately de-tuned yo= ur system which reduced the HV? So the damage is limited to a few turns?= Has it happened at the 0.2mm dia wire?
BTW i am using 0.4mm dia wire,= so not really much more...

Good luck in the next tests!

73,= Stefan


Am 22.11.2010 22:15, schrieb Chris Osborn:=20
Thanks for looking Roger and chaps but game's over for tonight.
I've insulation breakdown somewhere in the aerial circuit and I can't fi= x it until daylight.

Maybe try again next weekend.

73 Chris= G3XIZ


=
From: Roger Lapthorn <ro= gerlapthorn@gmail.com>
To:<= /SPAN> rsgb_lf_group@blacksheep.org; Chris Osborn <g3xiz@yahoo= .co.uk>
Sent: Mo= n, 22 November, 2010 20:49:24
Subj= ect: Re: LF: G3XIZ - no copy yet on 8.9719kHz

Jus= t swapped from the loop to the earth electrode - band noise stronger - and= there may be a hint of a signal on Chris's frequency.

73s
Roger G3XBM

On 22 November 2010 20:21, Roger Lapthorn <rogerlapthorn@g= mail.com> wrote:
Have been looking fo= r 20 minutes so far but nothing seen from Chris at about 34km distance.
Will continue to look for the next 2 hours.

73s
Roger G3XBM=

--
http://g3xbm-qrp.blogspot= .com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM   GQRP 1678    ISWL G11088
=



--
http://g3xbm-qrp.blogspo= t.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xb= m
G3XBM   GQRP 1678    ISWL G11088


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