Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh01.r1000.mx.aol.com (Internet Inbound) with ESMTP id D2A64380000A5; Tue, 2 Oct 2012 16:46:21 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TJ9Kw-0000LY-Hf for rs_out_1@blacksheep.org; Tue, 02 Oct 2012 21:45:02 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TJ9Kr-0000LN-Tl for rsgb_lf_group@blacksheep.org; Tue, 02 Oct 2012 21:44:57 +0100 Received: from imr-db01.mx.aol.com ([205.188.91.95]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TJ9Kp-0006Ql-G2 for rsgb_lf_group@blacksheep.org; Tue, 02 Oct 2012 21:44:56 +0100 Received: from mtaomg-ma06.r1000.mx.aol.com (mtaomg-ma06.r1000.mx.aol.com [172.29.41.13]) by imr-db01.mx.aol.com (Outbound Mail Relay) with ESMTP id 9ED4B38000094 for ; Tue, 2 Oct 2012 16:44:53 -0400 (EDT) Received: from core-dfe002c.r1000.mail.aol.com (core-dfe002.r1000.mail.aol.com [172.29.55.135]) by mtaomg-ma06.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 67885E00008C for ; Tue, 2 Oct 2012 16:44:53 -0400 (EDT) References: <506B407B.1020108@legal-medicine.de> To: rsgb_lf_group@blacksheep.org In-Reply-To: <506B407B.1020108@legal-medicine.de> X-MB-Message-Source: WebUI MIME-Version: 1.0 From: Markus Vester X-MB-Message-Type: User X-Mailer: Webmail 37001-BASIC Received: from 77.191.9.194 by web-mmc-m03.sysops.aol.com (64.12.224.136) with HTTP (WebMailUI); Tue, 02 Oct 2012 16:44:52 -0400 Message-Id: <8CF6EF5E7C84640-CD4-163FB@web-mmc-m03.sysops.aol.com> X-Originating-IP: [77.191.9.194] Date: Tue, 2 Oct 2012 16:44:52 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20110426; t=1349210693; bh=xEGqIqvmIO2PMTU4l01tmgboKRP87BbMZrBBLcEGXsY=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=NxK+TJTxPc4Jbi9bxhpDpMXc4qji87g1u4cuXkzoDEZKq2Hv5yYB4N5q/7g35rwRN JRJDR2IkmfvCZwT6ymEH6i4DLAWgbGHVC3BfCqOA6HZkV1Ox7OJJhqOY3hfjrTSao+ Vq8AHWIEQGa42EspHZkP9uCalqci2tH+Eo7C5aNA= X-AOL-SCOLL-SCORE: 0:2:461592384:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-Spam-Score: 0.2 (/) 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: Peter,  well I've also been scratching my head about those abrupt changes at the beginning of May and November.  I wondered whether it might be an artificial effect, perhaps from scheduled retuning of the antenna for summer vs. winter impedances. But while that might induce a minor change in ERP, it would hardly have an effect on the vertical radiation pattern. [...] Content analysis details: (0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [205.188.91.95 listed in list.dnswl.org] 1.7 URIBL_DBL_SPAM Contains an URL listed in the DBL blocklist [URIs: bplaced.net] 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 -2.1 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.6 URIBL_SBL Contains an URL listed in the SBL blocklist [URIs: bplaced.net] 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: b99b9f5ebb2905dfac0746d3f825052c Subject: Re: LF: Annual course of hga22 Content-Type: multipart/alternative; boundary="--------MB_8CF6EF5E7F58073_CD4_4E406_web-mmc-m03.sysops.aol.com" 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_FONTCOLOR_UNKNOWN,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: mtain-dh01.r1000.mx.aol.com ; domain : mx.aol.com DKIM : pass x-aol-sid: 3039ac1d4115506b529d6baa X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ----------MB_8CF6EF5E7F58073_CD4_4E406_web-mmc-m03.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Peter,=20 =C2=A0 well I've also been scratching my head=C2=A0about those abrupt changes at t= he beginning of May and November. =C2=A0 I wondered whether it might be an artificial effect,=C2=A0perhaps from sche= duled retuning of the antenna for summer vs. winter impedances. But while t= hat might induce a minor change in ERP, it would hardly have an effect on t= he vertical radiation pattern. Regarding temperature: Frozen ground can=C2=A0have a significant effect on = groundwave absorption. But it's hard to imagine that wide-spread frost woul= d occur=C2=A0so suddenly and at a deterministic time, and that it would per= sist continuously for so=C2=A0many months into springtime. =C2=A0 So this remains an unsolved mystery... =C2=A0 BTW There is=C2=A0also a=C2=A0small effect of frost or snow on phase veloci= ty. I noticed this when=C2=A0analysing emission=C2=A0times of dual-rated Am= erican=C2=A0Loran stations. Some of these were slaves which were synchroniz= ed over the air by different masters, and thus the emission times were stee= red=C2=A0via different groundwave paths. For some Northern and Canadian sec= ondaries, there=C2=A0were=C2=A0seasonal variations of several hundred nanos= econds which were clearly correlated with snow coverage: http://df6nm.bplaced.net/LoranView/American%20dualrate%20phase%20offset%201= 00208.gif In contrast, European chains, which are=C2=A0using local=C2=A0clocks to ste= er=C2=A0both rates,=C2=A0do not show this effect: http://df6nm.bplaced.net/LoranView/European%20dualrate%20phase%20offset%201= 00208.gif=C2=A0=C2=A0 =C2=A0 Best 73, Markus (DF6NM) =C2=A0 -----Urspr=C3=BCngliche Mitteilung-----=20 Von: pws <pws@legal-medicine.de> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org> Verschickt: Di, 2 Okt 2012 7:30 pm Betreff: Re: LF: Annual course of hga22 Hi Alan & Johan,=20 =20 Thanks!=20 =20 Johan wrote:=20 > ...=20 > It is interesting to see the very abrupt signal drop in the morning, a= nd how=20 > well it correlates to sunrise, and compare it to the irregular return = in the=20 > evening.=20 > ...=20 =20 Yes, apart from those sidereal dependent effects:=20 from May until October all day-light levels seem to be somewhat blurry.=20 May be it's an effect from temperature or thunderstorms ???=20 =20 BTW: those data are from a system established in 1999 for observing the =20 total solar eclipse at 75 kHz. I got the selective level meter from=20 Gary (dk8kw) and the computer is an old "laptop", Toshiba, I486,=20 ~15 years old, running Linux kernel 2.0. That system still refuses=20 to die running 24/7 since 2003. Meanwhile the keypad is defect, but I=20 still can reach it via ssh...=20 So, watch it running:=20 http://df3lp.de/cgi-bin/hga22/show-hga22.cgi=20 =20 Peter, df3lp=20 ----------MB_8CF6EF5E7F58073_CD4_4E406_web-mmc-m03.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
Peter,
 
well I've = also been scratching my head about those abrupt changes at the beginni= ng of May and November.
 
I wondered= whether it might be an artificial effect, perhaps from scheduled retu= ning of the antenna for summer vs. winter impedances. But while that might = induce a minor change in ERP, it would hardly have an effect on the vertica= l radiation pattern.
Regarding = temperature: Frozen ground can have a significant effect on groundwave= absorption. But it's hard to imagine that wide-spread frost would occur&nb= sp;so suddenly and at a deterministic time, and that it would persist conti= nuously for so many months into springtime.
 
So this re= mains an unsolved mystery...
 
BTW There = is also a small effect of frost or snow on phase velocity. I noti= ced this when analysing emission times of dual-rated American&nbs= p;Loran stations. Some of these were slaves which were synchronized over th= e air by different masters, and thus the emission times were steered v= ia different groundwave paths. For some Northern and Canadian secondaries, = there were seasonal variations of several hundred nanoseconds whi= ch were clearly correlated with snow coverage:
In contras= t, European chains, which are using local clocks to steer bo= th rates, do not show this effect:
 
Best 73,
Markus (DF= 6NM)
 
-----Urspr=C3=BCngliche Mitteilung-----
Von: pws <pws@legal-medicine.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Di, 2 Okt 2012 7:30 pm
Betreff: Re: LF: Annual course of hga22

Hi Alan & Johan, 

 

Thanks! 

 

Johan wrote: 

> ... 

> It is interesting to see the very abrupt signal drop in the morning, a=
nd how 

> well it correlates to sunrise, and compare it to the irregular return =
in the 

> evening. 

> ... 

 

Yes, apart from those sidereal dependent effects: 

from May until October all day-light levels seem to be somewhat blurry. 
May be it's an effect from temperature or thunderstorms ??? 

 

BTW: those data are from a system established in 1999 for observing the  
total solar eclipse at 75 kHz. I got the selective level meter from 

Gary (dk8kw) and the computer is an old "laptop", Toshiba, I486, 

~15 years old, running Linux kernel 2.0. That system still refuses 

to die running 24/7 since 2003. Meanwhile the keypad is defect, but I 

still can reach it via ssh... 

So, watch it running: 

ht=
tp://df3lp.de/cgi-bin/hga22/show-hga22.cgi 

 

Peter, df3lp
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