Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh04.r1000.mx.aol.com (Internet Inbound) with ESMTP id C148E380000A0; Sat, 25 May 2013 15:27:27 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UgK6a-0001Ha-Ep for rs_out_1@blacksheep.org; Sat, 25 May 2013 20:26:16 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UgK6W-0001HR-4J for rsgb_lf_group@blacksheep.org; Sat, 25 May 2013 20:26:12 +0100 Received: from omr-d07.mx.aol.com ([205.188.109.204]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1UgK6S-0003oy-EP for rsgb_lf_group@blacksheep.org; Sat, 25 May 2013 20:26:10 +0100 Received: from mtaout-da06.r1000.mx.aol.com (mtaout-da06.r1000.mx.aol.com [172.29.51.134]) by omr-d07.mx.aol.com (Outbound Mail Relay) with ESMTP id F21AF7000008E; Sat, 25 May 2013 15:25:46 -0400 (EDT) Received: from White (188-195-246-26-dynip.superkabel.de [188.195.246.26]) by mtaout-da06.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 4FB11E000182; Sat, 25 May 2013 15:25:43 -0400 (EDT) Message-ID: From: "Markus Vester" To: , , Date: Sat, 25 May 2013 21:25:40 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1369509946; bh=DKdBauy+sq9ab+aNVZtsxEau0plzblFODYszlEevGKM=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=ik5hCFkY1eoQkV6naX0pUsGYgWbik3dAoeZbXh78R7ralTKrXlx4SrNs1ONYSW4e1 zxqvvY//3YFsZvUAxBemKMZIdLbGDZrr96vTeqOT0P+UhjPO/5i2olqqKUdSCgYR5W bO+4i44XTlGAKSq2qRlqn14mP+D95J2dxnuwMZt0= X-AOL-SCOLL-SCORE: 0:2:371428000:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-Spam-Score: -0.8 (/) 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: Three days ago (May 22), the powerful French Navy station HWU shifted its operating frequency from 21.75 to 22.6 kHz. This is closer to 23.4 kHz from German DHO, and consequently the intermodulation bands created by joint ionospheric heating have moved and become more prominent due to the lower audio beat (0.8 kHz). http://df6nm.bplaced.net/LF/vlf_lf_icm_2013/test1305242330.jpg shows crossmodulation impressed on HGA22, a fat red band centered on 136.33 kHz (ie. 135.43 + 23.4 - 22.6). There is also a weaker band visible on 136.73 kHz (135.43 + 23.4 - 22.1) from DHO with GQD, which appears much more rarely here. Observers in Western Europe might also see crossmodulation from other VLF combinations, eg. GQD - HWU = 0.5 kHz. [...] Content analysis details: (-0.8 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [205.188.109.204 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 -1.1 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.3 URIBL_RHS_DOB Contains an URI of a new domain (Day Old Bread) [URIs: blacksheep.org] 0.0 WEIRD_PORT URI: Uses non-standard port number for HTTP 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: 6b0411a0208d534ec13cf5eb48c0cfb7 Subject: LF: Re: Ghost bands created by VLF ionospheric heating Content-Type: multipart/alternative; boundary="----=_NextPart_000_0016_01CE598E.680291B0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MISSING_OUTLOOK_NAME,WEIRD_PORT 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-dh04.r1000.mx.aol.com ; domain : mx.aol.com DKIM : fail x-aol-sid: 3039ac1d411851a1109f1ae1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0016_01CE598E.680291B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Three days ago (May 22), the powerful French Navy station HWU shifted = its operating frequency from 21.75 to 22.6 kHz. This is closer to 23.4 = kHz from German DHO, and consequently the intermodulation bands created = by joint ionospheric heating have moved and become more prominent due to = the lower audio beat (0.8 kHz). http://df6nm.bplaced.net/LF/vlf_lf_icm_2013/test1305242330.jpg shows = crossmodulation impressed on HGA22, a fat red band centered on 136.33 = kHz (ie. 135.43 + 23.4 - 22.6). There is also a weaker band visible on = 136.73 kHz (135.43 + 23.4 - 22.1) from DHO with GQD, which appears much = more rarely here. Observers in Western Europe might also see = crossmodulation from other VLF combinations, eg. GQD - HWU =3D 0.5 kHz. There are some more explanations in this thread: http://tech.groups.yahoo.com/group/VLF_Group/message/20598 =20 Best 73, Markus (DF6NM) From: Markus Vester=20 Sent: Sunday, February 10, 2013 2:07 AM To: rsgb_lf_group@blacksheep.org ; rsgb_lf_group@yahoogroups.co.uk=20 Subject: Ghost bands created by VLF ionospheric heating On my LF grabber http://www.df6nm.de/grabber/Grabber.htm there is again = a ~ 200 Hz wide red noise band centered on 137.08 kHz. It has been = observed several times before but has been absent for a few months. = Sometimes it is accompanied by a weaker "brother", centered on 137.18 = kHz with purple (ie. northerly) colour. The structure is reminiscent of = an MSK signal ("the ghost of CFH"). The bands were seen regularly but = are stronger in nights with strong Luxemboug effect. =20 After a lot of head scratching, a while ago I have found a really = astonishing explanation for this effect: It is ionospheric cross = modulation, with a pair of strong VLF transmitters acting together as a = modulated heater.=20 DHO38 on 23.4 kHz and HWU (which has recently reappeared on 21.75 kHz) = have a difference frequency of 1.65 kHz, with the sum of the two FSK = shifts. Similar to an AM demodulator, the beat frequency between the two = transmitters modulates the electron temperature in the D-layer, and the = variable absorption creates crossmodulation on the carriers of HGA22 = (135.43 + 1.65 kHz) and DCF39 (138.83 - 1.65 kHz). This constellation is = rather unusual not only in that the heating is done by VLF signals. What = is even more peculiar is that unlike a simple AM transmitter, the two = non-colocated heaters must produce an inhomogeneous and fast moving = heating pattern. If you look at the Twente WebSDR http://websdr.ewi.utwente.nl:8901/ now, = you can currently see and hear prominent 1.65 kHz FSK sidebands around = DCF39 and also DCF49 (128.93 kHz). However HGA seems less affected at = Twente, presumably because the easterly reflection area is not so well = illuminated for that path. Best 73, Markus (DF6NM) ------=_NextPart_000_0016_01CE598E.680291B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Three days ago (May 22), the powerful = French=20 Navy station HWU shifted its operating frequency from 21.75 to 22.6 = kHz.=20 This is closer to 23.4 kHz from German DHO, and = consequently the=20 intermodulation bands created by joint ionospheric heating have moved = and become=20 more prominent due to the lower audio beat (0.8 kHz).
h= ttp://df6nm.bplaced.net/LF/vlf_lf_icm_2013/test1305242330.jpg sh= ows crossmodulation=20 impressed on HGA22, a fat red band centered on 136.33 kHz (ie. = 135.43 +=20 23.4 - 22.6). There is also a weaker band visible on = 136.73 kHz=20 (135.43 + 23.4 - 22.1) from DHO with GQD, which appears much more rarely = here.=20 Observers in Western Europe might also see crossmodulation from other = VLF=20 combinations, eg. GQD - HWU =3D 0.5 kHz.
 
There are some more explanations = in this=20 thread:
http:= //tech.groups.yahoo.com/group/VLF_Group/message/20598 =20
 
Best 73,
Markus (DF6NM)
From: Markus Vester
Sent: Sunday, February 10, 2013 2:07 AM
To: rsgb_lf_group@blacksheep.org= ; rsgb_lf_group@yahoogroups= .co.uk=20
Subject: Ghost bands created by VLF ionospheric=20 heating

On my LF grabber http://www.df6nm.de/grab= ber/Grabber.htm there=20 is again a ~ 200 Hz wide red noise band centered on 137.08 = kHz. It has=20 been observed several times before but has been absent for a few months. = Sometimes it is accompanied by a weaker "brother", = centered on=20 137.18 kHz with purple (ie. northerly) colour. The structure = is=20 reminiscent of an MSK signal ("the ghost of CFH"). The bands were seen regularly but are stronger = in nights with=20 strong Luxemboug effect. 
 
After a lot of head scratching, a = while ago I=20 have found a really astonishing explanation for this effect: = It=20 is ionospheric cross modulation, with a pair of strong VLF = transmitters=20 acting together as a modulated heater.
 
DHO38 on 23.4 kHz and HWU (which = has recently=20 reappeared on 21.75 kHz) have a difference frequency of 1.65 = kHz, with=20 the sum of the two FSK shifts. Similar to an AM=20 demodulator, the beat frequency between the two transmitters modulates = the=20 electron temperature in the D-layer, and the variable = absorption=20 creates crossmodulation on the carriers of HGA22 (135.43 + 1.65 kHz) and = DCF39=20 (138.83 - 1.65 kHz). This constellation is rather unusual not only=20 in that the heating is done = by VLF=20 signals. What is even more peculiar is that unlike a = simple AM=20 transmitter, the two non-colocated heaters must produce an=20 inhomogeneous and fast moving heating pattern.
 
If you look at the Twente WebSDR http://websdr.ewi.utwente.nl:= 8901/ now,=20 you can currently see and hear prominent 1.65 kHz FSK = sidebands around=20 DCF39 and also DCF49 (128.93 kHz). However HGA seems less = affected at=20 Twente, presumably because the easterly reflection area is not so well=20 illuminated for that path.
 
Best 73,
Markus (DF6NM)
 
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