Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=DC_PNG_UNO_LARGO, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,SPF_PASS,T_DKIM_INVALID,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v7DKqmP6015288 for ; Sun, 13 Aug 2017 22:52:49 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dgzoe-0002ou-Pd for rs_out_1@blacksheep.org; Sun, 13 Aug 2017 21:48:56 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dgzoe-0002ol-DJ for rsgb_lf_group@blacksheep.org; Sun, 13 Aug 2017 21:48:56 +0100 Received: from omr-a008e.mx.aol.com ([204.29.186.51]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1dgzoa-0001DI-P7 for rsgb_lf_group@blacksheep.org; Sun, 13 Aug 2017 21:48:55 +0100 Received: from mtaomg-aaj01.mx.aol.com (mtaomg-aaj01.mx.aol.com [172.27.3.207]) by omr-a008e.mx.aol.com (Outbound Mail Relay) with ESMTP id DC8F7380008B for ; Sun, 13 Aug 2017 16:48:50 -0400 (EDT) Received: from core-acb02c.mail.aol.com (core-acb02.mail.aol.com [172.27.24.2]) by mtaomg-aaj01.mx.aol.com (OMAG/Core Interface) with ESMTP id 04F4B38000081 for ; Sun, 13 Aug 2017 16:48:50 -0400 (EDT) Received: from 188.192.44.165 by webprd-m86.mail.aol.com (10.74.55.27) with HTTP (WebMailUI); Sun, 13 Aug 2017 16:48:49 -0400 Date: Sun, 13 Aug 2017 16:48:49 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15ddd5b39f6-536a-15eab@webprd-m86.mail.aol.com> In-Reply-To: <5990B3F3.9060502@posteo.de> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.44.165] x-aol-global-disposition: G X-AOL-VSS-INFO: 5800.7501/119804 X-AOL-VSS-CODE: clean DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1502657330; bh=2THA38+/aJ5Wp6yqgPUs0bUMzFm45bupIZUJFuwi5JM=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=eQeeXI0BV4V/QXyfpcbi54jYK+id73N3NGYIcawxhWV9erOQok3PN//X1GDm2oGlt M3ySFvAqMc8og9Z4LtXcFfPxainiBF7LxVo//1KwJ+ND+6UkG2mommUuo0WQBZjPti cbeveB8Jxz0iQEV054DkQtqrGUlmPu4yaVSmE/5w= x-aol-sid: 3039ac1b03cf5990bb322c32 X-Scan-Signature: ffb804a3bc61dd08faf4263407b608d3 Subject: Re: VLF: Carrier on 3675.005 Hz / EbNaut - YES again Content-Type: multipart/mixed; boundary="----=_Part_106008_1591590043.1502657329653" 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-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 12379 ------=_Part_106008_1591590043.1502657329653 Content-Type: multipart/alternative; boundary="----=_Part_106007_384631622.1502657329652" ------=_Part_106007_384631622.1502657329652 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Stefan, despite the 27% loss of signal, the message was decoded fine, ev= en with a couple of dB to spare - not bad at all! Hope you can repair your = coil and get back on air soon. Jim, some simulation for the 226 km path might indeed be helpful. I suspect= that the path difference between groundwave and first-hop skywave is close= to a half-wavelength, possibly leading to partial cancellation and stronge= r diurnal variability. However the carrier SNR has not been strong enough t= o make a decently resolved measurement of diurnal amplitude and phase varia= tions. We could try to obtain a coarse estimate of absolute fieldstrength, using t= he received carrier level and e.g. DHO38 for reference. Knowing Stefan's ra= diated power, we could then try to derive propagation attenuation.=20 Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: So, 13. Aug 2017 22:20 Betreff: Re: VLF: Carrier on 3675.005 Hz / EbNaut - YES Hi VLF,=20 The repetition of yesterdays message failed. At 15:38 UTC the safety funct= ion tripped. I've just been on the roof, when re-starting the transmission = i can see a spark in the center of one of the stacks. So now there is anoth= er one which has a flash over! :-( It must be replaced, which is a lot of work. So the tranmissions on 3675 H= z will stopp for some time. At least we have some carrier detections and ev= en EbNaut decodes. I need to think about a different coil concept.... More current, more volt= age, more power, more more more! Am 13.08.2017 16:57, schrieb hvanesce@comcast.net:=20 #AOLMsgPart_2_34513077-c890-4a88-9595-44b2388f0bbc td{color: black;} @font-= face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;}@font-face {font-= family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4;}.aolReplacedBody p.aolmail_Ms= oNormal,.aolReplacedBody li.aolmail_MsoNormal,.aolReplacedBody div.aolmail_= MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family= :"Times New Roman","serif"; color:black;}.aolReplacedBody a:link,.aolReplac= edBody span.aolmail_MsoHyperlink {mso-style-priority:99; color:blue; text-d= ecoration:underline;}.aolReplacedBody a:visited,.aolReplacedBody span.aolma= il_MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decorati= on:underline;}.aolReplacedBody span.aolmail_EmailStyle17 {mso-style-type:pe= rsonal-reply; font-family:"Calibri","sans-serif"; color:#1F497D;}.aolReplac= edBody .aolmail_MsoChpDefault {mso-style-type:export-only; font-size:10.0pt= ;}@page WordSection1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in;}.a= olReplacedBody div.aolmail_WordSection1 {page:WordSection1;}=20 Stephan wrote: =E2=80=9CThe phase of that best decode is quite varying=E2=80=9D Is that observation based on the attached EbNaut Decoder window image from = Markus? It is just based on that decoder data. It is not really proof, just an idea= . Would it help to have an FDTD diurnal phase plot for this path at 3575Hz? For sure it would be interesting! If you like, do it. I would be curious to= see it. 73, Stefan ------=_Part_106007_384631622.1502657329652 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Stefan, despite the 27% loss of signal, the message w= as decoded fine, even with a couple of dB to spare - not bad at all! H= ope you can repair your coil and get back on air soon.

Jim, some sim= ulation for the 226 km path might indeed be helpful. I suspect that the pat= h difference between groundwave and first-hop skywave is close to a ha= lf-wavelength, possibly leading to partial cancellation and stronger diurna= l variability. However the carrier SNR has not been strong enough= to make a decently resolved measurement of diurnal amplitude and phas= e variations.

We could try to obtain a coarse estimate of absol= ute fieldstrength, using the received carrier level and e.g. DHO38 for= reference. Knowing Stefan's radiated power, we could then try to= derive propagation attenuation.

Best 73,
Markus (DF6NM)


-----Urspr=C3=BCngliche Mitteilung-----
Von: DK7FC <sel= berdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.o= rg>
Verschickt: So, 13. Aug 2017 22:20
Betreff: Re: VLF: Carrier o= n 3675.005 Hz / EbNaut - YES

Hi VLF,

The repetition of yesterdays message failed. At 15:38 UTC the safety function tripped. I've just been on the roof, when re-starting the transmission i can see a spark in the center of one of the stacks. So now there is another one which has a flash over! :-(
It must be replaced, which is a lot of work. So the tranmissions on 3675 Hz will stopp for some time. At least we have some carrier detections and even EbNaut decodes.

I need to think about a different coil concept.... More current, more voltage, more power, more more more!

Am 13.08.2017 16:57, schrieb hvanesce@comcast.net:
=20 =20