Return-Path: X-Spam-DCC: paranoid 1356; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,FORGED_AOL_TAGS, HTML_40_50,HTML_MESSAGE,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 s83EsAkJ031796 for ; Wed, 3 Sep 2014 16:54:10 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1XPBrB-0006rt-8r for rs_out_1@blacksheep.org; Wed, 03 Sep 2014 15:48:21 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1XPBrA-0006rk-O9 for rsgb_lf_group@blacksheep.org; Wed, 03 Sep 2014 15:48:20 +0100 Received: from omr-d01.mx.aol.com ([205.188.252.208]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.82) (envelope-from ) id 1XPBr7-0005Gd-3B for rsgb_lf_group@blacksheep.org; Wed, 03 Sep 2014 15:48:19 +0100 Received: from mtaomg-mcc01.mx.aol.com (mtaomg-mcc01.mx.aol.com [172.26.253.85]) by omr-d01.mx.aol.com (Outbound Mail Relay) with ESMTP id 2D2A8700567DB for ; Wed, 3 Sep 2014 10:48:14 -0400 (EDT) Received: from core-afa03c.mail.aol.com (core-afa03.mail.aol.com [172.27.24.3]) by mtaomg-mcc01.mx.aol.com (OMAG/Core Interface) with ESMTP id E7A3538000084 for ; Wed, 3 Sep 2014 10:48:13 -0400 (EDT) References: <54070CEC.2060303@psk31.plus.com> To: rsgb_lf_group@blacksheep.org In-Reply-To: <54070CEC.2060303@psk31.plus.com> X-MB-Message-Source: WebUI MIME-Version: 1.0 From: Markus Vester X-MB-Message-Type: User X-Mailer: AOL Webmail BASIC Received: from 194.138.39.60 by webmail-va036.sysops.aol.com (149.174.108.79) with HTTP (WebMailUI); Wed, 03 Sep 2014 10:48:11 -0400 Message-Id: <8D1959D37CE4709-218C-BF72@webmail-va036.sysops.aol.com> X-Originating-IP: [194.138.39.60] Date: Wed, 3 Sep 2014 10:48:12 -0400 x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20140625; t=1409755694; bh=EDPlhGjEkGU2KOKUPqXzuu5mMmKYhHCFROqVJVKnv2s=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=sUIo+bbqILi1Lh6Ksd+QeCA67MpS/WpuaMrAWUqEFwlfMCCQoWXGvbN4NOtpg/SDg QFNNv+eaT/tTmvC8D66dVFR8M2a04DFdXgXv9tnUovch2UE+dN77qctBONVoQqitvd wC4EEpnJiwLvpb92nq9SyzvPZAfWOO5gEIf0nSSI= x-aol-sid: 3039ac1afd5554072a2d0f3e X-Scan-Signature: 2015a9c9c70c0326c96b00c8a41f50f5 Subject: Re: LF: RE: ZEVS question Content-Type: multipart/alternative; boundary="--------MB_8D1959D38180D2E_218C_2691F_webmail-va036.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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 386 This is a multi-part message in MIME format. ----------MB_8D1959D38180D2E_218C_2691F_webmail-va036.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Eddie,=20Stefan,=0D=0A=C2=A0=0D=0Ayes=20I=20was=20surprised=20and=20exhilarated=20= to=20find=20the=20Schumann=20humps=20along=20with=20the=2082=20Hz=20signal.=20Th= e=20quest=20to=20see=20those=20always=20seemed=20like=20some=20kind=20of=20holy=20= grail=20regarding=20low=20frequency=20work=20;-)=0D=0A=C2=A0=0D=0AActually=20I=20= had=20tried=20to=20see=20ZEVS=20a=20couple=20of=20times=20in=20the=20past=20with= out=20success.=20But=20that=20was=20without=20any=20preamplification,=20sufferin= g=20from=20severe=20mismatch=20loss=20between=20the=20small=20antenna=20capacita= nce=20and=20the=201=20kohm=20soundcard=20input.=20Another=20attempt=20using=20th= e=206=20squaremeter=20magnetic=20loops=20in=20the=20garden=20also=20failed=20due= =20to=20low=20induction=20voltage=20and=20coupling=20to=20underground=20cables.=0D= =0A=C2=A0=0D=0AThe=20source=20follower=20has=20only=20a=20couple=20of=20resistor= s=20at=20the=20gate,=202.5=20Mohm=20in=20series=20and=2010=20Mohm=20shunt.=20Tog= ether=20with=20the=20capacitances=20of=20antenna=20(270=20pF)=20and=20a=20piece=20= of=20coax=20(200=20pF),=20the=20shunt=20makes=20a=20cutoff=20at=2027=20Hz.=20The= re=20is=20a=2010=20uF=20coupling=20capacitor=20to=20the=20soundcard=20which=20in= serts=20another=20pole=20at=2010=20Hz,=20and=20in=20addition=20the=20soundcard=20= internally=20fades=20out=20below=20about=207=20Hz.=0D=0A=C2=A0=0D=0AConnecting=20= a=20scope=20to=20the=20source,=20I=20am=20seeing=20monster=20signals=20from=20th= e=20grids,=20about=201.2=20V=20pp=20on=2016.7=20Hz=20(railway=20at=20400m)=20plu= s=200.3=20Vpp=20on=2050=20Hz=20(relatively=20weak=20due=20to=20underground=20sup= ply=20lines).=20The=20recording=20gain=20slider=20is=20set=20low=20such=20that=20= the=20ADC=20input=20range=20is=20about=202=20Vpp.=20With=2075%=20of=20clipping=20= levels,=20the=20little=20SpecLab=20input=20scope=20just=20occasionally=20becomes= =20red.=20Note=20that=20all=20software=20postprocessing=20(like=20noiseblanking=20= or=20notch=20filtering)=20is=20disabled.=0D=0A=C2=A0=0D=0AWorking=20back=20throu= gh=20mismatch,=20frequency=20response,=20and=20antenna=20height,=20the=20interfe= ring=20fieldstrength=20at=20this=20location=20is=20around=201.2=20V/m=20at=2016=20= Hz=20and=200.15=20V/m=20at=2050=20Hz.=20The=20railway=20also=20has=20a=20strong=20= fifth=20harmonic=20around=2083.3=20Hz,=20which=20is=20about=20half=20a=20Hz=20wi= de=20but=20fortunately=20doesn't=20seem=20to=20leak=20much=20into=20the=20ZEVS=20= band.=20=0D=0A=C2=A0=0D=0AThe=20ZEVS=20carrier=20itself=20reaches=20-91=20dB=20f= ullscale,=20translating=20to=20about=2030=20uV/m=20or=200.1=20picoTesla.=20From=20= Fig.2=20in=20http://www-ee.stanford.edu/~acfs/82Hz.pdf,=20the=20fieldstrength=20= at=202.5=20Mm=20should=20be=20-130=20dBA/m=20or=200.4=C2=A0=20picotesla=20in=20t= he=20main=20lobes=20(77=20and=20257=20degrees=20azimuth).=20At=20220=C2=B0=20fro= m=20Murmansk,=20one=20would=20expect=20a=20reduction=20by=20cos(37=C2=B0),=20giv= ing=200.32=20pT.=20Thus=20my=20observation=20is=20still=20about=2010=20dB=20shor= t=20of=20expectation.=20There=20also=C2=A0=20seems=20to=20be=20a=20bit=20of=20di= urnal=20variation=20both=20in=20Schumann=20and=20ZEVS=20levels,=20exhibiting=20a= =20shallow=20minimum=20at=20sunrise.=0D=0A=C2=A0=0D=0ABest=2073,=0D=0AMarkus=20(= DF6NM)=0D=0A=0D=0A=0D=0A=0D=0A=0D=0A=0D=0A-----Urspr=C3=BCngliche=20Mitteilung--= ---=20=0D=0AVon:=20g3zjo=20<g3zjo@psk31.plus.com>=0D=0AAn:=20rsgb_lf_group= =20<rsgb_lf_group@blacksheep.org>=0D=0AVerschickt:=20Mi,=203=20Sept=202014= =202:44=20pm=0D=0ABetreff:=20Re:=20LF:=20RE:=20ZEVS=20question=0D=0A=0D=0AHi=20M= akus,=20Stefan,=20All=0D=0A=0D=0AVery=20jealous=20here=20of=20Markus'=20Schumann= =20resonances,=20the=20response=20of=20my=20E-Probe=20filter=20necessarily=20cut= s=20off=20at=20that=20end.=0D=0AI=20did=20try=20different=20responses=20a=20whil= e=20ago=20and=20if=20I=20let=20much=2050Hz=20in=20it=20overwhelms=20everything=20= at=20this=20location.=0D=0AIt=20is=20nice=20to=20be=20able=20to=20see=20the=2016= .7Hz=20and=20harmonic=20which=20is=20sort=20of=20DX=20here.=0D=0A=0D=0A73=20Eddi= e=20G3ZJO=0D=0A=0D=0AOn=2002/09/2014=2023:45,=20Markus=20Vester=20wrote:=20Hi=20= Eddie,=20LF=20group,=0D=0A=C2=A0=0D=0Ait=20looks=20like=20despite=C2=A0very=20st= rong=C2=A050=20Hz=20and=2016.7=20Hz=20harmonics,=20I=20can=20still=20receive=20u= seful=20ELF=20signals=C2=A0from=20my=20Marconi=20(currently=C2=A0only=203=20m=20= above=20the=20roof)=C2=A0with=20a=20simple=20BF245=20source=20follower.=20The=20= top=20panel=20of=C2=A0my=20VLF=20grabber=C2=A0http://www.df6nm.de/vlf/vlfgrabber= .htm=C2=A0currently=20shows=C2=A0the=20ZEVS=20carrier,=20as=20well=20as=20severa= l=20Schumann=20resonances.=0D=0A=C2=A0=0D=0ABest=2073,=0D=0AMarkus=20(DF6NM)=0D=0A= =C2=A0=0D=0A=0D=0A=0D=0AFrom:=20g3zjo=20=0D=0ASent:=20Tuesday,=20September=2002,= =202014=2011:14=20AM=0D=0ATo:=20rsgb_lf_group@blacksheep.org=20=0D=0ASubject:=20= Re:=20LF:=20RE:=20ZEVS=20question=0D=0A=0D=0A=0D=0A=0D=0A=0D=0AAs=20part=20of=20= my=20checking=20that=20everything=20is=20OK=20and=20ready=20for=20the=20next=20=0D= =0Atests=20on=20ELF/ULF/SLF=20?=20I=20have=20my=20Grabber=0D=0A=C2=A0=20http://w= ww.g3zjo.talktalk.net/vlfgrabber.htm=0D=0ALive=20on=20Wide=20and=20ZEVS.=20ZEVS=20= is=20showing=20a=20good=20carrier=20at=20this=20time=20in=20my=20=0D=0Aurban=20e= nvironment.=0D=0A=0D=0A73=20Eddie=20G3ZJO=0D=0A=0D=0A...=0A=0A ----------MB_8D1959D38180D2E_218C_2691F_webmail-va036.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" =0D=0AEddie,=20Stefan,=0D=0A=0D=0A= =0D=0A =0D=0A=0D=0A=0D=0Ayes=20I=20was=20surprised=20and=20exhilarated=20to=20= find=20the=20Schumann=20humps=20along=20with=20the=2082=20Hz=20signal.=20The=20q= uest=20to=20see=20those=20always=20seemed=20like=20some=20kind=20of=20holy=20gra= il=20regarding=20low=20frequency=20work=20;-)=0D=0A=0D=0A=0D=0A =0D= =0A=0D=0A=0D=0AActually=20I=20had=20tried=20to=20see=20ZEVS=20a=20couple=20of=20tim= es=20in=20the=20past=20without=20success.=20But=20that=20was=20without=20any=20p= reamplification,=20suffering=20from=20severe=20mismatch=20loss=20between=20the=20= small=20antenna=20capacitance=20and=20the=201=20kohm=20soundcard=20input.=20Anot= her=20attempt=20using=20the=206=20squaremeter=20magnetic=20loops=20in=20the=20ga= rden=20also=20failed=20due=20to=20low=20induction=20voltage=20and=20coupling=20t= o=20underground=20cables.=0D=0A=0D=0A=0D=0A =0D=0A=0D=0A=0D=0AThe=20s= ource=20follower=20has=20only=20a=20couple=20of=20resistors=20at=20the=20gate,=20= 2.5=20Mohm=20in=20series=20and=2010=20Mohm=20shunt.=20Together=20with=20the=20ca= pacitances=20of=20antenna=20(270=20pF)=20and=20a=20piece=20of=20coax=20(200=20pF= ),=20the=20shunt=20makes=20a=20cutoff=20at=2027=20Hz.=20There=20is=20a=2010=20uF= =20coupling=20capacitor=20to=20the=20soundcard=20which=20inserts=20another=20pol= e=20at=2010=20Hz,=20and=20in=20addition=20the=20soundcard=20internally=20fades=20= out=20below=20about=207=20Hz.=0D=0A=0D=0A=0D=0A =0D=0A=0D=0A=0D=0A= Con= necting=20a=20scope=20to=20the=20source,=20I=20am=20seeing=20monster=20signals=20= from=20the=20grids,=20about=201.2=20V=20pp=20on=2016.7=20Hz=20(railway=20at=2040= 0m)=20plus=200.3=20Vpp=20on=2050=20Hz=20(relatively=20weak=20due=20to=20undergro= und=20supply=20lines).=20The=20recording=20gain=20slider=20is=20set=20low=20such= =20that=20the=20ADC=20input=20range=20is=20about=202=20Vpp.=20With=2075%=20of=20= clipping=20levels,=20the=20little=20SpecLab=20input=20scope=20just=20occasionall= y=20becomes=20red.=20Note=20that=20all=20software=20postprocessing=20(like=20noi= seblanking=20or=20notch=20filtering)=20is=20disabled.=0D=0A=0D=0A=0D=0A = =0D=0A=0D=0A=0D=0AWorking=20back=20through=20mismatch,=20frequency=20response,=20= and=20antenna=20height,=20the=20interfering=20fieldstrength=20at=20this=20locati= on=20is=20around=201.2=20V/m=20at=2016=20Hz=20and=200.15=20V/m=20at=2050=20Hz.=20= The=20railway=20also=20has=20a=20strong=20fifth=20harmonic=20around=2083.3=20Hz,= =20which=20is=20about=20half=20a=20Hz=20wide=20but=20fortunately=20doesn't=20see= m=20to=20leak=20much=20into=20the=20ZEVS=20band.=20=0D=0A=0D=0A=0D=0A =0D=0A=0D=0A=0D=0AThe=20ZEVS=20carrier=20itself=20reaches=20-91=20dB=20fullscale,= =20translating=20to=20about=2030=20uV/m=20or=200.1=20picoTesla.=20From=20Fig.2=20= in=20http://www-ee.stanf= ord.edu/~acfs/82Hz.pdf,=20the=20fieldstrength=20at=202.5=20Mm=20should=20be=20= -130=20dBA/m=20or=200.4 =20picotesla=20in=20the=20main=20lobes=20(77=20and=20= 257=20degrees=20azimuth).=20At=20220=C2=B0=20from=20Murmansk,=20one=20would=20ex= pect=20a=20reduction=20by=20cos(37=C2=B0),=20giving=200.32=20pT.=20Thus=20my=20o= bservation=20is=20still=20about=2010=20dB=20short=20of=20expectation.=20There=20= also =20seems=20to=20be=20a=20bit=20of=20diurnal=20variation=20both=20in=20= Schumann=20and=20ZEVS=20levels,=20exhibiting=20a=20shallow=20minimum=20at=20sunr= ise.=0D=0A=0D=0A=0D=0A =0D=0A=0D=0A=0D=0ABest=2073,
=0D=0AMarkus=20= (DF6NM)=0D=0A=0D=0A=0D=0A=0D=0A=0D=0A=0D=0A

=0D=0A
=0D=0A=0D=0A= =0D=0A

=0D=0A
=0D=0A-----Urspr=C3=BCngliche=20Mitteilung-----=20=0D=0AVon:=20g3zjo=20<g3zjo@psk31.plus.com>
=0D=0AAn:=20rsgb_lf_group=20= <rsgb_lf_group@blacksheep.org>
=0D=0AVerschickt:=20Mi,=203=20Sept=20201= 4=202:44=20pm
=0D=0ABetreff:=20Re:=20LF:=20RE:=20ZEVS=20question
=0D=0A=0D=0A=0D=0A=0D=0A=0D=0A=0D=0AHi=20Makus,=20Stefan,=20All
=0D=0A
=0D=0AVery=20jealous=20here=20of=20= Markus'=20Schumann=20resonances,=20the=20response=20of=20my=20E-Probe=20filter=20= necessarily=20cuts=20off=20at=20that=20end.
=0D=0AI=20did=20try=20different=20= responses=20a=20while=20ago=20and=20if=20I=20let=20much=2050Hz=20in=20it=20overw= helms=20everything=20at=20this=20location.
=0D=0AIt=20is=20nice=20to=20be=20a= ble=20to=20see=20the=2016.7Hz=20and=20harmonic=20which=20is=20sort=20of=20DX=20h= ere.
=0D=0A
=0D=0A73=20Eddie=20G3ZJO
=0D=0A
=0D=0AOn=2002/09/2014=20= 23:45,=20Markus=20Vester=20wrote:=20=0D=0A=0D=0A=0D=0A=
Hi=20Eddie,=20LF=20group,
=0D=0A= =0D=0A=0D=0A
 
=0D=0A=0D=0A=0D=0A
it=20looks=20like=20despite very=20strong 50=20Hz=20and=2016.7=20H= z=20harmonics,=20I=20can=20still=20receive=20useful=20ELF=20signals from=20= my=20Marconi=20(currently only=203=20m=20above=20the=20roof) with=20a=20= simple=20BF245=20source=20follower.=20The=20top=20panel=20of my=20VLF=20gra= bber http://www.df6nm.de/vlf/vlfgrabber.htm current= ly=20shows the=20ZEVS=20carrier,=20as=20well=20as=20several=20Schumann=20re= sonances.
=0D=0A=0D=0A=0D=0A
 
=0D=0A=0D=0A=0D=0A
= Best=2073,
=0D=0A=0D=0A=0D=0A
Markus=20(DF6NM)
=0D=0A=0D=0A=0D=0A =0D=0A=0D=0A=0D=0A=0D=0A=0D= =0A

=0D=0A
=0D=0A=0D=0A=0D=0A=0D=0A=0D=0AFrom:=20g3zjo=20=0D=0A= =0D=0A=0D=0A
Sent:=20Tuesday,=20September=2002,=202014=2011:14=20AM=0D=0A=0D=0A=0D=0A
To:=20r= sgb_lf_group@blacksheep.org=20
=0D=0A=0D=0A=0D=0A
Subject:=20= Re:=20LF:=20RE:=20ZEVS=20question
=0D=0A
=0D=0A=0D=0A=0D=0A=0D=0A=

=0D=0A
=0D=0AAs=20part=20of=20my=20checking=20that=20everything=20= is=20OK=20and=20ready=20for=20the=20next=20
=0D=0Atests=20on=20ELF/ULF/SLF=20= ?=20I=20have=20my=20Grabber
=0D=0A =20http://www.g3zjo.talktalk.net/vlfgrabber.htm
=0D=0A= Live=20on=20Wide=20and=20ZEVS.=20ZEVS=20is=20showing=20a=20good=20carrier=20at=20= this=20time=20in=20my=20
=0D=0Aurban=20environment.
=0D=0A
=0D=0A73=20E= ddie=20G3ZJO
=0D=0A
=0D=0A...
=0D=0A=0D=0A=0D=0A= ----------MB_8D1959D38180D2E_218C_2691F_webmail-va036.sysops.aol.com--