Return-Path: X-Spam-DCC: paranoid 1233; Body=3 Fuz1=2 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=5.0 tests=BAYES_00,FORGED_AOL_TAGS, HTML_50_60,HTML_MESSAGE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u3TIUXTB004594 for ; Fri, 29 Apr 2016 20:30:35 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1awD89-0001X2-0W for rs_out_1@blacksheep.org; Fri, 29 Apr 2016 19:27:09 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1awD88-0001Wt-GR for rsgb_lf_group@blacksheep.org; Fri, 29 Apr 2016 19:27:08 +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 4.87) (envelope-from ) id 1awD86-0005zz-4J for rsgb_lf_group@blacksheep.org; Fri, 29 Apr 2016 19:27:07 +0100 Received: from mtaomg-aao01.mx.aol.com (mtaomg-aao01.mx.aol.com [172.27.21.15]) by omr-a018e.mx.aol.com (Outbound Mail Relay) with ESMTP id 6813C3800068 for ; Fri, 29 Apr 2016 14:27:04 -0400 (EDT) Received: from core-acb05b.mail.aol.com (core-acb05.mail.aol.com [172.27.24.5]) by mtaomg-aao01.mx.aol.com (OMAG/Core Interface) with ESMTP id AE82738000086 for ; Fri, 29 Apr 2016 14:27:03 -0400 (EDT) To: rsgb_lf_group@blacksheep.org X-MB-Message-Source: WebUI X-MB-Message-Type: User MIME-Version: 1.0 From: Markus Vester X-Mailer: AOL Webmail BASIC Received: from 198.7.24.49 by webmail-vm062.sysops.aol.com (64.12.250.98) with HTTP (WebMailUI); Fri, 29 Apr 2016 14:27:03 -0400 Message-Id: <8D3705BDCB23FBE-2200-1DEDB7@webmail-vm062.sysops.aol.com> X-Originating-IP: [198.7.24.49] Date: Fri, 29 Apr 2016 14:27:03 -0400 x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1461954424; bh=CJrGATwBJIA3kpNQWTMV+PL7UGBZi2fyR4xYinwS4rQ=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=DcMIovSbLX0JetW0qxqZj/Gh52SWilxUD6i9HoOxT1hcVwd/e0+s2cuQdtstevSup U7/jSUjVP2rmiHNmqAeBdlIWCfAbHfEeO9HsjZNYrOTF2/J2KQyhpvBE2b/dLV7slP 2ZcRA+ku2N1DmnabelEZLsviA/1jcUNvc42kr5rY= x-aol-sid: 3039ac1b150f5723a7775dfe X-Scan-Signature: 69d86b33142413363dd56bd312139bf4 Subject: Re: VLF: EbNaut transmission on 8270.1 Hz again Content-Type: multipart/alternative; boundary="--------MB_8D3705BDCC7AC27_2200_3D00B5_webmail-vm062.sysops.aol.com" 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7927 This is a multi-part message in MIME format. ----------MB_8D3705BDCC7AC27_2200_3D00B5_webmail-vm062.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" =20=20=20=20=20Hi=20Paul,=0D=0A=20=20=C2=A0=0D=0A=20=20you=20may=20well=20be=20r= ight=20about=20the=20short=20ranges.=C2=A0The=C2=A0most=20simple=20picture=20loo= ks=20only=20at=20the=20geometric=20path=20difference=20groundwave=20and=20one-ho= p=20skywave.=20For=20180=20km=C2=A0distance=20and=2074=20km=20reflection=20heigh= t=C2=A0this=20is=2053=20km,=C2=A0which=20happens=20to=20be=C2=A01.5=20lambda=20(= perfect=20antiphase)=20at=208.5=20kHz.=20That=C2=A0is=20probably=20the=C2=A0reas= on=20for=20the=20midday=20minimum=20we=20are=20experiencing=20between=20Heidelbe= rg=20and=20Nuernberg,=20and=20better=20propagation=20early=20after=20sunrise.=C2= =A0Going=20to=20either=206=20or=2012=20kHz=20would=20fix=20it=20(albeit=20my=20r= ailway=20QRM=C2=A0is=20much=20more=20dense=20at=20lower=20frequencies).=C2=A0At=20= the=20bottom=20of=20http://df6nm.bplaced.net/VLF/2006/vlf_DHO_dualfreq.htm=C2=A0= there's=20a=20set=20of=C2=A0=20curves=20for=20inphase=20(red)=20and=20antiphase=20= (blue)=20frequencies=20versus=20distance.=0D=0A=20=20=C2=A0=0D=0A=20=20=0D=0A=20= =20All=20the=20best,=0D=0A=20=20Markus=0D=0A=20=20=0D=0A=20-----Urspr=C3=BCnglic= he=20Mitteilung-----=20Von:=20Paul=20Nicholson=20<vlf0403@abelian.org>An:=20= rsgb_lf_group=20<rsgb_lf_group@blacksheep.org>Verschickt:=20Fr,=2029=20Apr= =202016=2011:20=20amBetreff:=20Re:=20VLF:=20EbNaut=20transmission=20on=208270.1=20= Hz=20again=20=20=20=20=20=20>=20Paul's=20SNR=20seems=20to=20be=20about=208=20= dB=20better=20then=20mine,=20despite=20=20>=20almost=20fivefold=20distance.=20= =20The=20distance=20may=20actually=20be=20too=20short.=20=20=20For=20medium=20ra= nges,=20say=20100km=20to=20500km=20the=20phase=20and=20amplitude=20can=20vary=20= wildly=20due=20to=20the=20number=20of=20competing=20modes=20(or=20rays=20if=20yo= u=20prefer=20the=20ray=20model).=20=20=20When=20ray=20modeling=20I=20have=20to=20= use=20over=20a=20dozen=20rays,=20sometimes=2020=20to=20get=20a=20realistic=20loo= king=20diurnal.=20=20=20>=20QRG=208270.1=20Hz=20=20>=205=20characters,=202= 0=20second=20symbols,=208K19A=20=20>=20Start=206:00:02,=20end=208:50:42=20=20= Copied=20'HELLO'=20=20Eb/N0=20=3D=20+0.4dB=20constant=20reference=20phase=20and=20= carrier=20S/N:=2015.02=20dB=20in=2097.7=20uHz=20=20A=20good=20snowfall=20here=20= this=20morning=20so=20a=20lot=20of=20static=20from=20the=20E-field=20antenna.=20= =20--=20Paul=20Nicholson=20--=20=20=20=0D=0A=20=20=20=20=20=0D=0A=20=20=0A=0A ----------MB_8D3705BDCC7AC27_2200_3D00B5_webmail-vm062.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" =20=20=0D=0A=20=20=20=0D=0AHi=20Paul,=0D=0A=20=20=0D=0A =0D= =0A=20=20=0D=0Ayou=20may=20well=20be=20right=20about=20the=20short=20= ranges. The most=20simple=20picture=20looks=20only=20at=20the=20geomet= ric=20path=20difference=20groundwave=20and=20one-hop=20skywave.=20For=20180=20km=  distance=20and=2074=20km=20reflection=20height this=20is=2053=20km,&n= bsp;which=20happens=20to=20be 1.5=20lambda=20(perfect=20antiphase)=20at=208= .5=20kHz.=20That is=20probably=20the reason=20for=20the=20midday=20min= imum=20we=20are=20experiencing=20between=20Heidelberg=20and=20Nuernberg,=20and=20= better=20propagation=20early=20after=20sunrise. Going=20to=20either=206=20o= r=2012=20kHz=20would=20fix=20it=20(albeit=20my=20railway=20QRM is=20much=20= more=20dense=20at=20lower=20frequencies). At=20the=20bottom=20of=20http:= //df6nm.bplaced.net/VLF/2006/vlf_DHO_dualfreq.htm there's=20a=20set=20o= f =20curves=20for=20inphase=20(red)=20and=20antiphase=20(blue)=20frequencie= s=20versus=20distance.=0D=0A=20=20=0D=0A =0D=0A=20=20= =0D=0A=0D=0A=20=20=0D=0AAll=20th= e=20best,=0D=0A=20=20=0D=0AMarkus=0D=0A=20=20=0D=0A=0D=0A=20-----Urs= pr=C3=BCngliche=20Mitteilung-----=20Von:=20Paul=20Nicholson=20= <vlf0403@abelian.org>An:=20rsgb_lf_group=20<rsgb_lf_g= roup@blacksheep.org>Verschickt:=20Fr,=2029=20Apr=202016=201= 1:20=20amBetreff:=20Re:=20VLF:=20EbNaut=20transmission=20on=20= 8270.1=20Hz=20again=20=20=0D= =0A=20=20=20=20>=20= Paul's=20SNR=20seems=20to=20be=20about=208=20dB=20better=20then=20mine,=20despit= e=20=20>=20almost=20fivefold=20distance.=20=20The=20distance=20may=20actually=20be=20too=20short.=20=20= =20For=20medium=20ranges,=20say=20100km=20to=20500km=20the=20p= hase=20and=20amplitude=20can=20vary=20wildly=20due=20to=20the=20= number=20of=20competing=20modes=20(or=20rays=20if=20you=20prefer=20the=20ray=20model).=20=20=20When=20ray=20modeling=20I=20have=20to=20use=20o= ver=20a=20dozen=20rays,=20sometimes=2020=20to=20get=20a=20real= istic=20looking=20diurnal.=20=20=20>=20QR= G=208270.1=20Hz=20=20>=205=20characters,=2020=20second=20sy= mbols,=208K19A=20=20>=20Start=206:00:02,=20end=208:50:42=20= =20Copied=20'HELLO'=20=20Eb/N0=20=3D=20+0.4d= B=20constant=20reference=20phase=20and=20carrier=20S/N:=2015.0= 2=20dB=20in=2097.7=20uHz=20=20A=20good=20sno= wfall=20here=20this=20morning=20so=20a=20lot=20of=20static=20from=20the=20E-field=20antenna.=20=20--=20Paul=20Nicholson=20--=20=20=20=0D=0A=20=20=20=20=20=0D=0A=20=20 ----------MB_8D3705BDCC7AC27_2200_3D00B5_webmail-vm062.sysops.aol.com--