Return-Path: X-Spam-DCC: paranoid 1169; 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=-2.1 required=5.0 tests=BAYES_00,HTML_40_50, HTML_MESSAGE autolearn=unavailable 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 s96BSJj2008832 for ; Mon, 6 Oct 2014 13:28:19 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Xb6Oo-0005br-VK for rs_out_1@blacksheep.org; Mon, 06 Oct 2014 12:24:18 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Xb6Oo-0005bi-HY for rsgb_lf_group@blacksheep.org; Mon, 06 Oct 2014 12:24:18 +0100 Received: from nm31-vm8.bullet.mail.ir2.yahoo.com ([212.82.97.95]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.82) (envelope-from ) id 1Xb6Ol-0004eZ-Pj for rsgb_lf_group@blacksheep.org; Mon, 06 Oct 2014 12:24:17 +0100 X-DKIM-Result: Domain=yahoo.co.uk Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s2048; t=1412594654; bh=lQBr0Gut1WrdkSyRcwEpIEfe64aPkfdrPZg8936Wn0A=; h=Received:Received:Received:X-Yahoo-Newman-Property:X-Yahoo-Newman-Id:X-YMail-OSG:Date:From:Reply-To:To:Message-ID:In-Reply-To:References:Subject:MIME-Version:Content-Type:Content-Length:From:Subject; b=LVX1oEH4xYs8a+fYR1F9gfCqKeNdsEFCpF38w+0pw1GYBTeBniluSIEBhSx4rahHyKD2lDiAmynmmT9pyey1MLVlSeoIV4SoVJKl7LGEBxz2rY/Ce4RBOwZ2Pqx/KLjYc/Vsw9G+Rox/w+BmV6edGeUJIJB++SSGuLDWAKFQQrgaEVgEvtddB7MHxBo0p3bgp4/o2VzEJsHkvf1Nlup7RwGEuHg4jCTRfsWa/D7A0jwT3AGt0U6vejkMDe0oJ9VsP5c/BTiSIYVkw3RfG9gfKB4yf2eSW4XmcSOPUxxemOVIEdU02OUZf96Nc2AS0bcl0uYGr+bT75oTpO373nLIeQ== DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s2048; d=yahoo.co.uk; b=W/n+FBe1LN6j8S1Fh1ydLwU1XKI5ek/pm3oCe2dy863s7tCjzTb5aREf2tzhoCwmrSE7i48aFpgKTr3mPsULXCXzsjeP18bYEBDqL8IbJ7qIgxr5FViKu3ZoNj+eYO3sIkE57sOwn0QX0MU03j3EHJwG3ubegf9qB25A17rhzrL4Ln517Pi+z3KILZdR9TZr/lRqIfN0qSobKeRqoDJ2p5FTP2En7Oxc9tP31MAAjehwVBdgE2k+L/07G4nmNH16PZcK6inwSKbLvzdfDAWTK17R6P4AyngQQTfgIF/ApZL1UqGcy382LqofI/6iuY8p2hdSltLpz0edJDQF+tE29w==; Received: from [212.82.98.59] by nm31.bullet.mail.ir2.yahoo.com with NNFMP; 06 Oct 2014 11:24:14 -0000 Received: from [212.82.98.78] by tm12.bullet.mail.ir2.yahoo.com with NNFMP; 06 Oct 2014 11:24:14 -0000 Received: from [127.0.0.1] by omp1015.mail.ir2.yahoo.com with NNFMP; 06 Oct 2014 11:24:14 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 455304.57465.bm@omp1015.mail.ir2.yahoo.com X-YMail-OSG: RxiVwl4VM1mG.bhImh6k3MI3R8iFYkkPRGJrqxYFuGU5CvvO6Axgq3Y8doPJ14K a0jb.dXKNtWS0MaYbGTzvrodlc8NCe_0Ymz6C75D.SNBv4Qr6Puj5x.bSCMzOeVMamk_OKWTjkKp 02MIZDOEbAwA2FWW4c4Q336GeG_.VJ5s63HDGOi5.qCTLfU6UpT6nURrtvyM4sHqazpZXyTEIy_9 fcX5HhVkW1Kx7rzMRqLlLUaKKvOnOsGZoZgQTcHpDGfa6IBaHCdH.zIoaa0fPSk2rvfcXX7FOCUQ NUUjzTs2WdqGXcPbmgWaQc62XCLPKDh5YGMUGn2PS_HXmSdiw4gA7q.nYY0ZecUNVvBTM.DoORX1 4Q4MDXk1yGtdyRgQkjU6oCiFS3EhLamDw_jLYww6tzayQzfiBE1oqJmzHwD9r2OACwqrAuhQ5IAd RW7w8ngOowkZRoU_FD3LZnWJEXVZpD0bt0hpWNLir5MoMuX.t6y_4tc.weI6FZ73byrTPmsSeluH 6MNVxDmCLT.KqswHJzimxLunydP35aveJqI1fqnN_zbFmteSIH1E_xPjDbAIojMlCthgdDS8aH0x viGlsiyrZUcOUkrBUPjjQrTWU076xODrwHv7yt7qZ6VZUaQrXqU6vaeb3T4ZDL2H3PEfKNsVmbi8 MN3LYh2pKtxPVZMqWwLwp2jOxY1nqVV3FwWGsUkW0aB7GgQYbMSh_bsyBlGvldT0zkjHBb5efCCU mYL39QxBjjlKD6ZzkRcX3CWomUFHCRnXwPFnqiJ22 Date: Mon, 6 Oct 2014 11:21:39 +0000 (UTC) From: M0FMT To: "rsgb_lf_group@blacksheep.org" Message-ID: <368556804.224701.1412594499146.JavaMail.yahoo@jws11110.mail.ir2.yahoo.com> In-Reply-To: <5431C1BC.3050208@gmail.com> References: <5431C1BC.3050208@gmail.com> MIME-Version: 1.0 X-Scan-Signature: edae4bc128aa121544439b7b7cfd26a1 Subject: Re: LF: Re: Schumann in my garden Content-Type: multipart/alternative; boundary="----=_Part_224700_717929202.1412594499142" 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: 684 ------=_Part_224700_717929202.1412594499142 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi all Stefan, Thank you for the teach-in, very interesting.=C2=A0I am amazed even= outside your city that the band is so clear. My experience in Saarland dur= ing my visits in the 2003-8 period was that just about anywhere I went I co= uld hear the mains supply harmonics on the Hire car radio tuned to LW (I us= ed to listen the BBC on 198khz). I can not remember anywhere in the UK wher= e it was that "Bad". I always assumed it was the very high loading on your = grid by a power hungry and burgeoning industry (never remotely experienced = here of course) causing the wave form to become square......:-) 73 es GL Pete M0FMT IO91UX Sent via my own personal Too-Way (two way) Earth Station to and from=C2=A0t= he Eutelsat Ka-band satellite=C2=A0 http://www.tooway.co.uk/ =C2=A0at appro= ximately=C2=A0172 degrees Azimuth in the Clarke belt owing to BTs 19th cent= ury cable technology=C2=A0inability to provide a good enough 21st century b= roadband service. I agree for this message to be passed on to BT Plc at 81 = Newgate Street, London EC1A 7AJ=C2=A0 via the snoops at GCHQ Cheltenham, th= ank for=C2=A0your cooperation it is appreciated.=20 From: DK7FC <73dk7fc@googlemail.com> To: "rsgb_lf_group@blacksheep.org" =20 Sent: Sunday, 5 October 2014, 23:10 Subject: LF: Re: Schumann in my garden =20 PS: Another link :-)=C2=A0 The filehttps://dl.dropboxusercontent.com/u/198= 82028/VLF/VLF%20Garten%20in%20T%20Antenne%2005102014_2nd.WAV(576 MB) You ca= n test your sound system by listening to the 16 2/3 Hzstuff and ELF sferics= :-) Am 06.10.2014 00:06, schrieb DK7FC: Hi ELF und sub-ELF fans,=20 =20 I have to report about very good success on reception in the ELF=C2=A0 ands= ub-ELF range. This evening arround 16 UTC i successfully received 5 Schuman= nresonances with my T antenna in the garden in 8m above ground,400m outside= the city. =20 I significantly improved the circuit:=20 =20 Higher input resistance, now 100 MOhm Lower cut off frequency using a 3 stage LPF arround 3 kHz also a lower cuf off frequency of the high pass now below 10 Hz Removed the electronic parts from the breadboard and re-soldered themon a c= opper board. This was essential! because there were undefinedconducting lay= ers on the breadboard which affected the working point ofthe JFET. =20 New preamp: https://dl.dropboxusercontent.com/u/19882028/VLF/20141005_16262= 1.jpg New schematic: https://dl.dropboxusercontent.com/u/19882028/VLF/DK7FC%20ELF= %20preamp%20V2.jpg =20 Results (shown without sferic blanking) wideband 0...24 kHz: https://dl.dropboxusercontent.com/u/19882028/VLF/NewEL= F_wide_10s_1.46HzFFT.png=C2=A0alsoshowing the frequency response of the cir= cuit 0...1 kHz: https://dl.dropboxusercontent.com/u/19882028/VLF/NewELF_0to1kHz_= 10s_1.46HzFFT.png 0...55 Hz: https://dl.dropboxusercontent.com/u/19882028/VLF/0...55Hz_5sperd= iv_45mHzFFT_garden3rd.png ZEVS:https://dl.dropboxusercontent.com/u/19882028/VLF/ZEVS_garden3rd.png=C2= =A0(notso strong this time. QRN?) =20 What about these sferics below 2 kHz? Is it normal that they are sostrong? = Or is it a technical problem? Can i improve the situation byharder attenuat= ing the spectrum above 2 kHz? At least this is what iwant to try. =20 =20 Next ideas for improving the SNR of ZEVS and Schumann: Increasing the R of the LPF to 2.2...3.3 MOhm Maybe trying 1 GOhm for biasing the JFETs gate to 6V Improving the insulation of the antenna feeds (simple cord now, withoutcera= mic between). Trying to rise the antenna 1 meter Fixing the feed point by a ceramic insulator =20 73, Stefan/DK7FC =20 =20 ------=_Part_224700_717929202.1412594499142 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi all

Stefan, Thank you for the teach-= in, very interesting. I am amazed even outside your city that the band= is so clear. My experience in Saarland during my visits in the 2003-8 peri= od was that just about anywhere I went I could hear the mains supply harmon= ics on the Hire car radio tuned to LW (I used to listen the BBC on 198khz).= I can not remember anywhere in the UK where it was that "Bad". I always as= sumed it was the very high loading on your grid by a power hungry and burge= oning industry (never remotely experienced here of course) causing the wave= form to become square......:-)

73 es GL Pete M0FMT IO91UX






Sent via my own personal Too-Way (two way) Earth Station to and from&nb= sp;the Eutelsat Ka-band satellite  http://www.tooway.co.uk/  at a= pproximately 172 degrees Azimuth in the Clarke belt owing to BTs 19th = century cable technology inability to provide a good enough 21st centu= ry broadband service. I agree for this message to be passed on to BT Plc at= 81 Newgate Street, London EC1A 7AJ  via the snoops at GCHQ Cheltenham= , thank for your cooperation it is appreciated.=20


From: DK7FC <73dk7fc@googlemail.com= >
To: "rsgb_lf_grou= p@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Sent: Sunday, 5 October 2014, 23:10
= Subject: LF: Re: Schumann = in my garden

=20
PS: Another link :-)  The file https://dl.dropboxusercontent.com= /u/19882028/VLF/VLF%20Garten%20in%20T%20Antenne%2005102014_2nd.WAV (576 MB) You can test your sound system by listening to the 16 2/3 Hz stuff and ELF sferics :-)

Am 06.10.2014 00:06, schrieb DK7FC:
=20 Hi ELF und sub-ELF fans,

I have to report about very good success on reception in the ELF  and sub-ELF range. This evening arround 16 UTC i successfully received 5 Schumann resonances with my T antenna in the garden in 8m above ground, 400m outside the city.

I significantly improved the circuit:

Higher input resistance, now 100 MOhm
Lower cut off frequency using a 3 stage LPF arround 3 kHz
also a lower cuf off frequency of the high pass now below 10 Hz
Removed the electronic parts from the breadboard and re-soldered them on a copper board. This was essential! because there were undefined conducting layers on the breadboard which affected the working point of the JFET.

New preamp: https://dl.dropboxusercontent.com/u/19882028/VLF/20141005_162= 621.jpg
New schematic: https://dl.dropboxusercontent.com/u/19882028/VLF/DK7= FC%20ELF%20preamp%20V2.jpg

Results (shown without sferic blanking)
wideband 0...24 kHz: https://dl.dropboxusercontent.com/u/19882028/VLF/New= ELF_wide_10s_1.46HzFFT.png  also showing the frequency response of the circuit
0...1 kHz: https://dl.dropboxusercontent.com/u/19882028/VLF/= NewELF_0to1kHz_10s_1.46HzFFT.png
0...55 Hz: https://dl.dropboxusercontent.com/u/19882= 028/VLF/0...55Hz_5sperdiv_45mHzFFT_garden3rd.png
ZEVS:https://dl.dropboxusercontent.com/u/19882028/VLF/ZEVS_garden= 3rd.png  (not so strong this time. QRN?)

What about these sferics below 2 kHz? Is it normal that they are so strong? Or is it a technical problem? Can i improve the situation by harder attenuating the spectrum above 2 kHz? At least this is what i want to try.


Next ideas for improving the SNR of ZEVS and Schumann:
Increasing the R of the LPF to 2.2...3.3 MOhm
Maybe trying 1 GOhm for biasing the JFETs gate to 6V
Improving the insulation of the antenna feeds (simple cord now, without ceramic between).
Trying to rise the antenna 1 meter
Fixing the feed point by a ceramic insulator

73, Stefan/DK7FC




------=_Part_224700_717929202.1412594499142--