Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg06.r1000.mx.aol.com (Internet Inbound) with ESMTP id A3C06380000D1; Tue, 2 Apr 2013 16:51:48 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UN7gu-0002PQ-Nq for rs_out_1@blacksheep.org; Tue, 02 Apr 2013 21:20:24 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UN7gt-0002P9-QP for rsgb_lf_group@blacksheep.org; Tue, 02 Apr 2013 21:20:23 +0100 Received: from imr-ma04.mx.aol.com ([64.12.206.42]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1UN7gq-0004Gg-1N for rsgb_lf_group@blacksheep.org; Tue, 02 Apr 2013 21:20:22 +0100 Received: from mtaout-da05.r1000.mx.aol.com (mtaout-da05.r1000.mx.aol.com [172.29.51.133]) by imr-ma04.mx.aol.com (Outbound Mail Relay) with ESMTP id 9F9E81C000109 for ; Tue, 2 Apr 2013 16:19:58 -0400 (EDT) Received: from Black (188-195-246-26-dynip.superkabel.de [188.195.246.26]) by mtaout-da05.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 8C688E0000EC for ; Tue, 2 Apr 2013 16:19:57 -0400 (EDT) Message-ID: <0A4E5A0C708C46A8A173AFD0D3A5500A@Black> From: "Markus Vester" To: Date: Tue, 2 Apr 2013 22:19:21 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1364933998; bh=MbWNrE50qnaeAWJ/Xba3DLrovZ4qEZG6guD/s1UI6Eg=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=jermOlPjmGAinY/RvwlOO8Dl3stfSxMxjXT22EADqwrCOW0t66zvLfBG1cKVeTz6Z JpL1h5rK3iaprQ9ttGjBN2xVud3GidymtrfypBGSYHGL/bjQvEHDQGsgJInrgUqLsh 1aAwnEon6D/hU3FWQyfFpXqsnPiwDGiCmN54BbhM= X-AOL-SCOLL-SCORE: 0:2:473945536:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Joe, LF, thanks very much for this report, I am very pleased that you (again!) managed to pull my signal out of the noise. People like you make all the effort worthwhile. Here's a follow-up on the antenna and coil story. On Sunday, the first Decca litz prototype gave up after only three minutes, with a sudden loud screetch and loss of resonance. Careful inpection showed that it had arced in a gap between two segments, where I had not laid the turns carefully in the correct order, inadvertently overcrossing wires with a larger voltage difference. My first thought was what Stefan's comment would be about me ruining the precious litz! Anyway I unwound the coil completely and taped the defect http://df6nm.bplaced.net/LF/pictures/topload_doubled/decca_litz_breakdown_45.jpg . Then I rewound it more neatly on a new bucket, this time using only three layers and shorter segments to reduce the internal voltages (3x5 turns instead of 4x9). The remaining long wire end was used for a smaller variometer insert (1x40 turns) to coarse-tune the inductance: http://df6nm.bplaced.net/LF/pictures/topload_doubled/new_decca_coil_outside_46.jpg As I had hoped, the AC resistance on the the network analyzer had dropped from 6.6 to 4.3 ohms (Q = 1000). The coil is also thermally more open to air than the old one. Then I ventured into the unavoidable nail-biting WSPR-15 soak test... no arcing and no heating this time, the coil actually stayed completely cold. In the dark there was no visible corona anywhere. But the noise level on the FM broadcast band increases sharply when I transmit, indicating that there must still be some partial discharges lurking somewhere in the system. [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [64.12.206.42 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 SPF_PASS SPF: sender matches SPF record -2.3 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 913d7a7c91a460d176c89ad756da16f9 Subject: Re: LF: OP32 136K TA Opportunity tonight Content-Type: multipart/alternative; boundary="----=_NextPart_000_000B_01CE2FF0.2017CBD0" 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=HTML_20_30,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: mtain-mg06.r1000.mx.aol.com ; domain : mx.aol.com DKIM : pass x-aol-sid: 3039ac1d60ce515b44e30534 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_000B_01CE2FF0.2017CBD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Joe, LF, thanks very much for this report, I am very pleased that you (again!) = managed to pull my signal out of the noise. People like you make all the = effort worthwhile. Here's a follow-up on the antenna and coil story. On Sunday, the first = Decca litz prototype gave up after only three minutes, with a sudden = loud screetch and loss of resonance. Careful inpection showed that it = had arced in a gap between two segments, where I had not laid the turns = carefully in the correct order, inadvertently overcrossing wires with a = larger voltage difference. My first thought was what Stefan's comment = would be about me ruining the precious litz! Anyway I unwound the coil = completely and taped the defect = http://df6nm.bplaced.net/LF/pictures/topload_doubled/decca_litz_breakdown= _45.jpg . Then I rewound it more neatly on a new bucket, this time using only = three layers and shorter segments to reduce the internal voltages (3x5 = turns instead of 4x9). The remaining long wire end was used for a = smaller variometer insert (1x40 turns) to coarse-tune the inductance:=20 = http://df6nm.bplaced.net/LF/pictures/topload_doubled/new_decca_coil_outsi= de_46.jpg As I had hoped, the AC resistance on the the network analyzer had = dropped from 6.6 to 4.3 ohms (Q =3D 1000). The coil is also thermally = more open to air than the old one. Then I ventured into the unavoidable = nail-biting WSPR-15 soak test... no arcing and no heating this time, the = coil actually stayed completely cold. In the dark there was no visible = corona anywhere. But the noise level on the FM broadcast band increases = sharply when I transmit, indicating that there must still be some = partial discharges lurking somewhere in the system. =20 To be able to transmit overnight, I repositioned the temporary support = mast from the rooftop window to the balcony: = http://df6nm.bplaced.net/LF/pictures/topload_doubled/support_pole_on_balc= ony_37.jpg=20 = http://df6nm.bplaced.net/LF/pictures/topload_doubled/antenna_and_support_= pole_from_east_34.jpg = http://df6nm.bplaced.net/LF/pictures/topload_doubled/antenna_and_supportp= ole_from_south_40.jpg For the three Opera transmissions last night, I cranked up the power to = about 440 W, driving 4.6 A (22 kV) up to 9 m effective height. This = happens to be almost exactly one watt ERP.=20 Best 73, Markus (DF6NM) ----- Original Message -----=20 From: jcraig@mun.ca=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, April 02, 2013 3:16 PM Subject: Re: LF: OP32 136K TA Opportunity tonight Dear Group, Despite very high mains noise levels there were 2 Op32 receptions of DF6NM at 0000 and 0449 at -37 and -35 dB respectively. 73 Joe VO1NA On Mon, 1 Apr 2013, Graham wrote: > OP32 136K TA Opportunity tonight > Joe VO1NA will be monitoring 136.00 K tonight for OP32 > Good luck all > > 73-Graham ------=_NextPart_000_000B_01CE2FF0.2017CBD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Joe, LF,
 
thanks very much for this report, I am = very pleased=20 that you (again!) managed to pull my signal out of the noise. People = like you=20 make all the effort worthwhile.
 
Here's a follow-up on = the antenna and=20 coil story. On Sunday, the first Decca litz prototype gave up after = only three minutes, with a sudden loud screetch and loss of = resonance.=20 Careful inpection showed that it had arced in a gap between two = segments,=20 where I had not laid the turns carefully in the = correct=20 order, inadvertently overcrossing wires with a larger voltage = difference.=20 My first thought was what Stefan's comment would be about me = ruining=20 the precious litz!  Anyway I unwound the coil completely = and taped=20 the defect
 http://df6nm.bplaced.net/LF/pictures/topload_doubled/dec= ca_litz_breakdown_45.jpg=20 .
Then I rewound it more neatly on a new = bucket, this=20 time using only three layers and shorter segments to reduce the internal = voltages (3x5 turns instead of 4x9). The remaining long wire = end was=20 used for a smaller variometer insert (1x40 turns) to coarse-tune = the=20 inductance:
 http://df6nm.bplaced.net/LF/pictures/topload_doubled/n= ew_decca_coil_outside_46.jpg
As I had hoped, the AC resistance = on the the=20 network analyzer had dropped from 6.6 to 4.3 ohms (Q =3D 1000). The = coil is=20 also thermally more open to air than the old one. Then = I ventured into=20 the unavoidable nail-biting WSPR-15 soak test... no arcing and no = heating this=20 time, the coil actually stayed completely cold. In the = dark there=20 was no visible corona anywhere. But the noise level on the FM=20 broadcast band increases sharply when I transmit, indicating that=20 there must still be some partial discharges lurking somewhere = in the=20 system.  
 
To be able to transmit = overnight, I=20 repositioned the temporary support mast from the rooftop window to the=20 balcony:
 http://df6nm.bplaced.net/LF/pictures/topload_doubled/= support_pole_on_balcony_37.jpg 
 http://df6nm.bplaced.net/LF/pictures/toplo= ad_doubled/antenna_and_support_pole_from_east_34.jpg
 http://df6nm.bplaced.net/LF/pictures/toplo= ad_doubled/antenna_and_supportpole_from_south_40.jpg
 
For the three Opera transmissions last night, I cranked up the = power to about 440 W, driving 4.6 A (22 kV) up to 9 m = effective=20 height. This happens to be almost exactly one watt = ERP. 
 
Best 73,
Markus (DF6NM)
 
 
----- Original Message -----=20
From: jcraig@mun.ca =
Sent: Tuesday, April 02, 2013 3:16 PM
Subject: Re: LF: OP32 136K TA Opportunity = tonight

Dear Group,

Despite very high mains = noise=20 levels there were 2 Op32 receptions
of DF6NM at 0000 and 0449 at -37 = and -35=20 dB respectively.

73
Joe VO1NA

On Mon, 1 Apr 2013, = Graham=20 wrote:

> OP32 136K TA Opportunity tonight
> Joe =20 VO1NA  will  be  monitoring   136.00 K = tonight =20 for  OP32
> Good  luck all
>
>=20 73-Graham

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