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 v9HH6g4o023826 for ; Tue, 17 Oct 2017 19:06:44 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1e4VEN-000710-AP for rs_out_1@blacksheep.org; Tue, 17 Oct 2017 18:00:39 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1e4VEM-00070r-8h for rsgb_lf_group@blacksheep.org; Tue, 17 Oct 2017 18:00:38 +0100 Received: from omr-a018e.mx.aol.com ([204.29.186.64]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1e4VEI-0001Uf-Nu for rsgb_lf_group@blacksheep.org; Tue, 17 Oct 2017 18:00:37 +0100 Received: from mtaomg-aah02.mx.aol.com (mtaomg-aah02.mx.aol.com [172.27.1.144]) by omr-a018e.mx.aol.com (Outbound Mail Relay) with ESMTP id 526D53800157 for ; Tue, 17 Oct 2017 13:00:32 -0400 (EDT) Received: from core-acb03f.mail.aol.com (core-acb03.mail.aol.com [172.27.24.3]) by mtaomg-aah02.mx.aol.com (OMAG/Core Interface) with ESMTP id 9E97638000081 for ; Tue, 17 Oct 2017 13:00:31 -0400 (EDT) Received: from 80.146.228.69 by webjas-vac009.srv.aolmail.net (10.96.19.12) with HTTP (WebMailUI); Tue, 17 Oct 2017 13:00:30 -0400 Date: Tue, 17 Oct 2017 13:00:30 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15f2b478bc7-c10-5199@webjas-vac009.srv.aolmail.net> In-Reply-To: MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [80.146.228.69] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1508259632; bh=oI4RxirBkEUyyGmSY6koCWWCEvI9z7M+++z+gaYf51A=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=MmhrCkGxfzQ5N2ieNhukWXJ8YHqGmGzY9AJJU0+78FFmYpZuxG4/teWOlaVvW5iEu EzV8OLRaafpSJFYYOJc8cuHvymgiBGQ56ou0zm5GDGhz45fE1iaLLPeqnDphZ9UmQu IjkyRHZmMhZKlOnA1GIBCp3U5Lpuv/3tZvBogifI= x-aol-sid: 3039ac1b019059e6372f52f9 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: Very interesting! Noting the steep dip near 200 km, which seems to be in line with the observed lack of nighttime (as opposed to daytime) signal at DL0AO. Could you perhaps also produce a similar plot for local noon? [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 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: c0e6e8bcdc231effb9da2003d606d9a2 Subject: Re: VLF: EbNaut on 2 frequencies Content-Type: multipart/alternative; boundary="----=_Part_25699_2079133047.1508259630023" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_MESSAGE, MAILTO_TO_SPAM_ADDR 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_25699_2079133047.1508259630023 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Very interesting! Noting the steep dip near 200 km, which seems to be in li= ne with the observed lack of nighttime (as opposed to daytime) signal at DL= 0AO. Could you perhaps also produce a similar plot for local noon? Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Paul Nicholson An: rsgb_lf_group Verschickt: Di, 17. Okt 2017 18:41 Betreff: Re: VLF: EbNaut on 2 frequencies I ran my homebrew propagation model on the great circle from DK7FC in direction of Todmorden. Here's the received signal for the two frequencies, http://abelian.org/vlf/tmp/171017c.gif given 200mA current and antenna effective height of 20m. Todmorden is at 881 km and the rxed flux density is 6430 Hz: 0.032fT 6510 Hz: 0.046fT so 6510 is about 3dB stronger than 6430. The model uses the international reference ionosphere https://en.wikipedia.org/wiki/International_Reference_Ionosphere and takes account of date, time and bearing. It is ray tracing ground wave and in this case up to 18 hop sky waves. Actually 12 hops seems enough. -- Paul Nicholson -- ------=_Part_25699_2079133047.1508259630023 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Very interesting! Noting the steep dip near 200 km, whic= h seems to be in line with the observed lack of nighttime (as opposed to da= ytime) signal at DL0AO. Could you perhaps also produce a&nbs= p;similar plot for local noon?

Best 73,
Markus (DF6NM)


-----Urspr=C3=BCngliche Mitteilung-----
Von: Paul Nicholson &= lt;vlf0403@abelian.org>
An: rsgb_lf_group <rsgb_lf_group@blackshee= p.org>
Verschickt: Di, 17. Okt 2017 18:41
Betreff: Re: VLF: EbNaut= on 2 frequencies


I ran my homebrew propagation model on t= he great circle from
DK7FC in direction of Todmorden.

Here's the = received signal for the two frequencies,

http://abelian.org/vlf/tmp/1710= 17c.gif

given 200mA current and antenna effective height of 20m.=

Todmorden is at 881 km and the rxed flux density is

6430 H= z: 0.032fT
6510 Hz: 0.046fT

so 6510 is about 3dB stronger than = 6430.

The model uses the international reference ionosphere

= https://en.wikipedia.org/wiki/International_Reference_I= onosphere

and takes account of date, time and bearing. It is ra= y tracing
ground wave and in this case up to 18 hop sky waves. Actually=
12 hops seems enough.

--
Paul Nicholson
--

------=_Part_25699_2079133047.1508259630023--