Return-Path: X-Spam-DCC: paranoid 1233; 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=-0.6 required=5.0 tests=BAYES_00,HTML_50_60, HTML_MESSAGE,HTML_TITLE_EMPTY,RATWARE_GECKO_BUILD 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 s9BG1Fvw005595 for ; Sat, 11 Oct 2014 18:01:15 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Xcyz8-0005sZ-1N for rs_out_1@blacksheep.org; Sat, 11 Oct 2014 16:53:34 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Xcyz7-0005sQ-Dn for rsgb_lf_group@blacksheep.org; Sat, 11 Oct 2014 16:53:33 +0100 Received: from mail-la0-f41.google.com ([209.85.215.41]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.82) (envelope-from <73dk7fc@googlemail.com>) id 1Xcyz4-0005F0-UT for rsgb_lf_group@blacksheep.org; Sat, 11 Oct 2014 16:53:32 +0100 Received: by mail-la0-f41.google.com with SMTP id pn19so4866851lab.28 for ; Sat, 11 Oct 2014 08:53:29 -0700 (PDT) X-DKIM-Result: Domain=googlemail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=from:message-id:date:user-agent:mime-version:to:subject:references :in-reply-to:content-type; bh=1QWISnTZraq44vNpuCsNemxeHl1z8+7juSHxXCZUc8Y=; b=iU5W2Win52EKxLFlWvhf1Q964QIwW4dUyNSYoo73xGYCgqHwbbidiRqZigDRz6+4fU iol5RxORRgivyzvIpWIgUfwRJinemwXRmXrCPvpWib/cCMyAVwfnpAw30NYugwMWNQTk MSz+zjYw9npbEhyS0ZtCeBxfpPAbxu18AnTpX5VCsQihNBx+gfLPUMzBLqbn0mmyRWtL I1wwWpsrbgxFG3lqwZc87lncVSOyfdahZCER6fl1Vd/rOKnq6zLS5roOAGQQLspaffqF DXYEJkZpkCZCZHA6dDDltI0rzr+HTse/8nkrhBKZ9w7GFUz+Kkuy3zXD3XfZ8LP/svtc vPSg== X-Received: by 10.152.3.167 with SMTP id d7mr12184065lad.17.1413042808880; Sat, 11 Oct 2014 08:53:28 -0700 (PDT) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id n4sm2814990lah.2.2014.10.11.08.53.27 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 11 Oct 2014 08:53:28 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <54395276.5080701@gmail.com> Date: Sat, 11 Oct 2014 17:53:26 +0200 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <8D1B1F63855FC23-95C-9269@webmail-vm139.sysops.aol.com> In-Reply-To: <8D1B1F63855FC23-95C-9269@webmail-vm139.sysops.aol.com> X-Scan-Signature: 87525734ac0bb319fb3f44295fe6963b Subject: Re: LF: ELF communications ? Content-Type: multipart/alternative; boundary="------------080802070501000402010102" 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: RO X-Status: A X-Keywords: X-UID: 757 This is a multi-part message in MIME format. --------------080802070501000402010102 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi ELF, Unfortunetely my HV transformer got (obviously) an internal short cut during transmitting on 136 Hz. With a scope and HV probe i measured nearly 10 kV rms on half the output. So there must be a resonance between transformer and antenna... I have to use the next one which is on another QTH. Maybe i can try an ignition coil which is here, somewhere. Have to delay the ELF test :-/ Back on MF WSPR-2 now for some time... 73, Stefan/DK7FC Am 09.10.2014 18:35, schrieb Markus Vester: > Stefan, > this could work. In the capacitive near-field range, the electrical > field would be > E = voltage * capacitance * effective height / (2 pi epsilon0) / > distance ^3 > With 10 kV on your antenna capacitance and height, you'd get about > 0.15 mV/m at 2.4 km, maybe 14 dB stronger than ZEVS. > Take care! Touching 10 kV on 136 kHz will severly burn you. But on 136 > Hz it would kill you, unless the current is safely limited to a few mA. > 73, Markus > > > -----Ursprüngliche Mitteilung----- > Von: DK7FC <73dk7fc@googlemail.com> > An: rsgb_lf_group > Verschickt: Do, 9 Okt 2014 2:51 pm > Betreff: LF: ELF communications ? > > > > > Hi ELF, > > > > This afternoon i'm attempting to transmit on my INV-L on 136.172 Hz (not > > kHz!). Just preparing my H bridge VLF PA and i intend to use an old 10 > > kV transformer which i got from an old furnance (to inflame the oil > > stream), see > > https://dl.dropboxusercontent.com/u/19882028/VLF/10kV%20Trafo.jpg > > > > Will that work on 2.4 km distance? It's well inside the near field. > > Which mode could be possible? QRSS-3? CW? > > The 2200000 m band, or 2.2 Mm band :-) A near field of 350 km !! > > I hope i can apply 10 kV to the antenna. It will not be resonated. And > > maybe i will see harmonics as well, because the input is rectangular... > > > > 73, Stefan/DK7FC > > > --------------080802070501000402010102 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi ELF,

Unfortunetely my HV transformer got (obviously) an internal short cut during transmitting on 136 Hz. With a scope and HV probe i measured nearly 10 kV rms on half the output. So there must be a resonance between transformer and antenna...
I have to use the next one which is on another QTH. Maybe i can try an ignition coil which is here, somewhere.
Have to delay the ELF test :-/

Back on MF WSPR-2 now for some time...

73, Stefan/DK7FC

Am 09.10.2014 18:35, schrieb Markus Vester:
Stefan,
 
this could work. In the capacitive near-field range, the electrical field would be
 
 E = voltage * capacitance * effective height / (2 pi epsilon0) / distance ^3
 
With 10 kV on your antenna capacitance and height, you'd get about 0.15 mV/m at 2.4 km, maybe 14 dB stronger than ZEVS.
 
Take care! Touching 10 kV on 136 kHz will severly burn you. But on 136 Hz it would kill you, unless the current is safely limited to a few mA. 
 
73, Markus


-----Ursprüngliche Mitteilung-----
Von: DK7FC <73dk7fc@googlemail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 9 Okt 2014 2:51 pm
Betreff: LF: ELF communications ?




Hi ELF, 

  

 This afternoon i'm attempting to transmit on my INV-L on 136.172 Hz (not  

 kHz!). Just preparing my H bridge VLF PA and i intend to use an old 10  

 kV transformer which i got from an old furnance (to inflame the oil  

 stream), see  

 https://dl.dropboxusercontent.com/u/19882028/VLF/10kV%20Trafo.jpg 

  

 Will that work on 2.4 km distance? It's well inside the near field.  

 Which mode could be possible? QRSS-3? CW? 

 The 2200000 m band, or 2.2 Mm band :-) A near field of 350 km !! 

 I hope i can apply 10 kV to the antenna. It will not be resonated. And  

 maybe i will see harmonics as well, because the input is rectangular... 

  

 73, Stefan/DK7FC
--------------080802070501000402010102--