Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w0BNnwLZ003674 for ; Fri, 12 Jan 2018 00:50:00 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eZmWJ-0004vS-7M for rs_out_1@blacksheep.org; Thu, 11 Jan 2018 23:44:27 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eZmWI-0004vJ-OY for rsgb_lf_group@blacksheep.org; Thu, 11 Jan 2018 23:44:26 +0000 Received: from omr-a002e.mx.aol.com ([204.29.186.56]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1eZmWE-0007uM-DN for rsgb_lf_group@blacksheep.org; Thu, 11 Jan 2018 23:44:25 +0000 Received: from mtaomg-laa01.mx.aol.com (mtaomg-laa01.mx.aol.com [172.27.2.99]) by omr-a002e.mx.aol.com (Outbound Mail Relay) with ESMTP id 327CC3800084 for ; Thu, 11 Jan 2018 18:44:20 -0500 (EST) Received: from core-acb06g.mail.aol.com (core-acb06.mail.aol.com [172.27.24.6]) by mtaomg-laa01.mx.aol.com (OMAG/Core Interface) with ESMTP id C2FC038000086 for ; Thu, 11 Jan 2018 18:44:19 -0500 (EST) Received: from 188.194.222.230 by webjas-vae239.srv.aolmail.net (10.96.23.242) with HTTP (WebMailUI); Thu, 11 Jan 2018 18:44:18 -0500 Date: Thu, 11 Jan 2018 18:44:18 -0500 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <160e79c257f-1717-5101@webjas-vae239.srv.aolmail.net> In-Reply-To: References: <160e7583ebc-1717-5df8f@webjas-vad003.srv.aolmail.net> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.194.222.230] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1515714260; bh=6YHkB5VoFlhkbSbJgdSwT19jLXu9D0OkF/2vF8XJa0o=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=ecxB45Ykib95kg8CuSHqRi3mp/vn+SMZtL58LIDlZKZ1Y03YjV3GHpjfmEcr9J2cn cFgy8sCeykstJbR+nWXy8IZudo50zADZTX5YmK9mMBW6Gv85lh3ka4sH65lkfqHGi5 1U1etO3759a6t8/pKtMFTv8EuqLvJosTQGWggndw= x-aol-sid: 3039ac1b02635a57f6d3589d X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Alan, don't know for sure, but I think the depth of seasonal temperature changes in the ground (a few meters at best) would be much shallower than the ELF skin depth (a kilometer) in the highly resistive rock bed. I rather tend to believe that some energy is being saved by switching to a lower "standby" current during times of less submarine activity. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) 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: 86b6d14137f1f41166b7b27a17921f7a Subject: Re: LF: Re: Recent ZEVS activity Content-Type: multipart/alternative; boundary="----=_Part_27481_459890299.1515714258303" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,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 ------=_Part_27481_459890299.1515714258303 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Alan, don't know for sure, but I think the depth of seasonal temperature changes = in the ground (a few meters at best) would be much shallower than the ELF s= kin depth (a kilometer) in the highly resistive rock bed. I rather tend to = believe that some energy is being saved by switching to a lower "standby" c= urrent during times of less submarine activity. Best 73, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Alan Melia An: rsgb_lf_group Verschickt: Fr, 12. Jan 2018 0:31 Betreff: LF: Re: Recent ZEVS activity =EF=BB=BF=20 Hi Markus is there a possibility that hard frozen ground at the tx site mig= ht give an increase in ERP? Alan G3NYK =20 ----- Original Message -----=20 From: Markus Vester=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, January 11, 2018 10:30 PM Subject: ELF: Recent ZEVS activity It looks like ZEVS (aka KPTF) is currently undergoing a period of increased= activity. SNR at DL0AO is now significantly better than it used to be, so = I suspect that transmit power might have been increased. In addition, we ha= ve now enabled a 20 Hz filter and a noiseblanker, which effectively suppres= ses local QRM bursts. We find that in addition to the traditional three-digit repeated telegrams = based on 4-minute dashes, there is also a much faster FSK mode with short d= ashes (about 10 or 12 seconds). These high-datarate sequences are always in= itiated by a long dash on the highest frequency, 83.2 Hz. Screenshots: http://df6nm.bplaced.net/dl0ao/files/zevs_7.63mHz_180111_2114.png http://df6nm.bplaced.net/dl0ao/files/zevs_183mHz_180108_0914.png DL0AO Grabber: http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm See also: G3ZJO 2012-05-12: https://g3zjoradio.wordpress.com/2012/05/12/more-on-82hz-= radio-comms-zevs-13669381/ DL4YHF 2008-08-29: http://dl4yhf.darc.de/t/vlf_experiments.htm Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Markus Vester An: rsgb_lf_group Verschickt: So, 1. Okt 2017 0:44 Betreff: Re: ELF: ZEVS reception from a small loop Those ZEVS messages seem to consist of simple three-digit numbers. With 0.2= Hz spacing, the frequency ranges 81 to 81.8 and 82.2 to 83 Hz provide ten = possible MFSK symbols. Each message is sent twice, separated by a single 80= .8 Hz dash. Consecutive messages are always separated by the 82 Hz idle ton= e. Assuming that symbol frequencies are counted upwards from 0 to 4 and 5 to 9= , Stefan's screenshot would translate to ..7 486 128 731 941 473 018 =20 73, Markus =20 ... ------=_Part_27481_459890299.1515714258303 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Alan,

don't know for sure, but I t= hink the depth of seasonal temperature changes in the ground (a few meters = at best) would be much shallower than the ELF skin depth (a kilometer)= in the highly resistive rock bed. I rather tend to believe that = some energy is being saved by switching to a lower "sta= ndby" current during times of less submarine activity.

Bes= t 73,
Markus


-----Urspr=C3=BCngliche Mitteilung--= ---
Von: Alan Melia <alan.melia@btinternet.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 12. Jan 2018 0:31
Betreff: LF: Re: Rece= nt ZEVS activity

=EF=BB=BF
Hi Markus is there a possibility that hard frozen=20 ground at the tx site might give an increase in ERP?
Alan
G3NYK
 
----- Original Message -----
Sent: Thursday, January 11, 201= 8 10:30=20 PM
Subject: ELF: Recent ZEVS activ= ity

It looks like ZEVS (aka KPTF) is currently underg= oing a period of=20 increased activity. SNR at DL0AO is now significantly be= tter than it used to=20 be, so I suspect that transmit power might have been increased. In additi= on,=20 we have now enabled a 20 Hz filter and a noiseblanker, which effectively= =20 suppresses local QRM bursts.
We find that in addition to the traditional = three-digit=20 repeated telegrams based on 4-minute dashes, there is also a much faster = FSK=20 mode with short dashes (about 10 or 12 seconds). These high-datarate sequ= ences=20 are always initiated by a long dash on the highest frequency, 83.2 Hz.

See also:
G3ZJO 20= 12-05-12:=20 https://g3zjoradio.wor= dpress.com/2012/05/12/more-on-82hz-radio-comms-zevs-13669381/
DL4YHF=20 2008-08-29: http://dl4yhf.darc.de/t/vlf_experiments.htm

Best 73,
Markus (D= F6NM)



-= ----Urspr=C3=BCngliche=20 Mitteilung-----
Von: Markus Vester=20 <markusvester@aol.= com>
An: rsgb_lf_group=20 <rsgb_lf_g= roup@blacksheep.org>
Verschickt: So, 1. Okt 2017=20 0:44
Betreff: Re: ELF: ZEVS reception from a small loop
Those ZEVS messages seem to consist of simple thr= ee-digit numbers.=20 With 0.2 Hz spacing, the frequency ranges 81 to 81.8 and 82.2 to 83=20 Hz provide ten possible MFSK symbols. Each message is sent= =20 twice, separated by a single 80.8 Hz dash. Consecutive mes= sages=20 are always separated by the 82 Hz idle tone.

Assuming that symbol frequencies are counted upwards from=20 0 to 4 and 5 to 9, Stefan's screenshot would translate to

..7 486 128   731    941=20        473   018
&= nbsp;
73, Markus  

= ...
------=_Part_27481_459890299.1515714258303--