Return-Path: Received: from mtain-mi03.r1000.mx.aol.com (mtain-mi03.r1000.mail.aol.com [172.21.131.161]) by air-db05.mail.aol.com (v129.4) with ESMTP id MAILINDB052-861f4ccb11943da; Fri, 29 Oct 2010 14:25:24 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mi03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 30E72380000AB; Fri, 29 Oct 2010 14:25:23 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PBtcJ-0006qf-AQ for rs_out_1@blacksheep.org; Fri, 29 Oct 2010 19:23:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PBtcI-0006qW-Og for rsgb_lf_group@blacksheep.org; Fri, 29 Oct 2010 19:23:54 +0100 Received: from blu0-omc1-s1.blu0.hotmail.com ([65.55.116.12]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PBtcG-00058p-PI for rsgb_lf_group@blacksheep.org; Fri, 29 Oct 2010 19:23:54 +0100 Received: from BLU146-W30 ([65.55.116.7]) by blu0-omc1-s1.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 29 Oct 2010 11:23:45 -0700 Message-ID: X-Originating-IP: [138.32.32.166] From: Laurence KL7UK To: Date: Fri, 29 Oct 2010 10:23:46 -0800 Importance: Normal In-Reply-To: <4CCAFFCE.7010603@iup.uni-heidelberg.de> References: ,<4CCAFFCE.7010603@iup.uni-heidelberg.de> MIME-Version: 1.0 X-OriginalArrivalTime: 29 Oct 2010 18:23:45.0885 (UTC) FILETIME=[6C78D8D0:01CB7796] X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="_a39409af-87b5-4772-adac-56a05e281d1b_" Subject: RE: LF: vlf experiments-numerical considerations X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=FORGED_HOTMAIL_RCVD, 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-sid: 3039400cdecb4ccb119262e7 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_a39409af-87b5-4772-adac-56a05e281d1b_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Make it 8000Kms :-) =20 =20 Laurence KL7UK =20 > Date: Fri, 29 Oct 2010 19:09:34 +0200 > From: schaefer@iup.uni-heidelberg.de > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: vlf experiments-numerical considerations >=20 > Hi Jacek, >=20 > Could you create a picture like plot_80km for distances up to 5000km? I= =20 > think i do not want to start simulating, my job is in the field ;-) But= =20 > you have done it and may generate it easily? >=20 > This all is very interesting but i wonder if there are not significant= =20 > propagation differences between the way the waves have to travel (flat= =20 > land, sea, alpes, poles...!) > E.g. Renato Romero has an excellent RX down to DC but my S/N at his=20 > location was rather poor (compared to other RX stations). So, is it the= =20 > local QRN that may be a little more in the south or maybe due to the=20 > alps? The S/N between 8970 and 6470 was about the same, as at other=20 > locations too. > What do the experts think could be the difference between these differnt= =20 > traveling ways? >=20 > 73, Stefan >=20 >=20 >=20 >=20 > Am 29.10.2010 14:58, schrieb Jacek Lipkowski: > > this is a nice plot showing field strength vs frequency and distance,= =20 > > calculated from Piotr's code. please notice that for a given distance= =20 > > there are two frequencies which yield the highest field strength for= a=20 > > constant antenna current - see the second plot, calculated for 904km= =20 > > distance (my distance from DK7FC :) > > > > btw, Piotr's code is very fast! > > > > i made a slightly modified version to include calculating of multiple= =20 > > values, and some additional stuff (compiling via gfortran, a makefile,= =20 > > ploting the data via gnuplot etc). it was used to make these graphs.= i=20 > > can post it if anyone is interested > > > > VY 73 > > > > Jacek / SQ5BPF >=20 =3D --_a39409af-87b5-4772-adac-56a05e281d1b_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Make it 8000Kms :-) 
 
Laurence KL7UK
 
> Date: Fri, 29 Oct 2010 19:09:34 +0200
> From: schaefer@iup.uni-= heidelberg.de
> To: rsgb_lf_group@blacksheep.org
> Subject: Re= : LF: vlf experiments-numerical considerations
>
> Hi Jacek,<= BR>>
> Could you create a picture like plot_80km for distances= up to 5000km? I
> think i do not want to start simulating, my job= is in the field ;-) But
> you have done it and may generate it eas= ily?
>
> This all is very interesting but i wonder if there= are not significant
> propagation differences between the way the= waves have to travel (flat
> land, sea, alpes, poles...!)
>= E.g. Renato Romero has an excellent RX down to DC but my S/N at his
&= gt; location was rather poor (compared to other RX stations). So, is it th= e
> local QRN that may be a little more in the south or maybe due= to the
> alps? The S/N between 8970 and 6470 was about the same,= as at other
> locations too.
> What do the experts think cou= ld be the difference between these differnt
> traveling ways?
&g= t;
> 73, Stefan
>
>
>
>
> Am 29.1= 0.2010 14:58, schrieb Jacek Lipkowski:
> > this is a nice plot sh= owing field strength vs frequency and distance,
> > calculated= from Piotr's code. please notice that for a given distance
> >= there are two frequencies which yield the highest field strength for a > > constant antenna current - see the second plot, calculated for= 904km
> > distance (my distance from DK7FC :)
> >
&= gt; > btw, Piotr's code is very fast!
> >
> > i made= a slightly modified version to include calculating of multiple
>= > values, and some additional stuff (compiling via gfortran, a makefil= e,
> > ploting the data via gnuplot etc). it was used to make th= ese graphs. i
> > can post it if anyone is interested
> &g= t;
> > VY 73
> >
> > Jacek / SQ5BPF
> =3D --_a39409af-87b5-4772-adac-56a05e281d1b_--