Return-Path: Received: from mtain-mi03.r1000.mx.aol.com (mtain-mi03.r1000.mail.aol.com [172.21.131.161]) by air-dc04.mail.aol.com (v129.4) with ESMTP id MAILINDC041-86004da5ed561e1; Wed, 13 Apr 2011 14:37:10 -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 02AC738000300; Wed, 13 Apr 2011 14:37:03 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QA4vB-0001KC-Qd for rs_out_1@blacksheep.org; Wed, 13 Apr 2011 19:36:09 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QA4vB-0001K3-8X for rsgb_lf_group@blacksheep.org; Wed, 13 Apr 2011 19:36:09 +0100 Received: from defout.telus.net ([199.185.220.80]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QA4v8-0008SR-2j for rsgb_lf_group@blacksheep.org; Wed, 13 Apr 2011 19:36:09 +0100 Received: from edtncm03 ([199.185.220.221]) by priv-edtnes28.telusplanet.net (InterMail vM.8.01.03.00 201-2260-125-20100507) with ESMTP id <20110413183602.TMGO6613.priv-edtnes28.telusplanet.net@edtncm03> for ; Wed, 13 Apr 2011 12:36:02 -0600 Received: from [192.168.1.74] ([75.157.139.149]) by edtncm03 with bizsmtp id X6c21g03h3DbXvv016c2Z1; Wed, 13 Apr 2011 12:36:02 -0600 X-Telus-Outbound-IP: 75.157.139.149 X-Authority-Analysis: v=1.1 cv=K9GHI98SDtD/JTh6fJYait4M9FyL3ZUQ9yWMBOXN4X8= c=1 sm=2 a=jVez_htjv6wA:10 a=DnEL2bpAaaAA:10 a=LGgl8L9ij00A:10 a=Q9fys5e9bTEA:10 a=95HZuusQAAAA:8 a=13wgKmBYzkQagJfVbGAA:9 a=PUjeQqilurYA:10 Message-ID: <4DA5ED12.7040103@telus.net> Date: Wed, 13 Apr 2011 11:36:02 -0700 From: Scott Tilley User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.15) Gecko/20110303 Lightning/1.0b2 Thunderbird/3.1.9 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4DA4C478.8000300@iup.uni-heidelberg.de> <4DA596F8.7010007@iup.uni-heidelberg.de> <4DA5C918.20403@telus.net> <4DA5E899.3060201@iup.uni-heidelberg.de> In-Reply-To: <4DA5E899.3060201@iup.uni-heidelberg.de> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: VLF: field strength as a function of frequency curve... Content-Type: text/plain; charset=ISO-8859-15; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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: 3039400cdecb4da5ed4f3505 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Content-Transfer-Encoding: quoted-printable X-Mailer: Unknown (No Version) No worries Stefan. That's what makes having a group interested in the same topic so=20 powerful. We all contribute ideas and materials and eventually we all=20 sort it out. Very interesting stuff thanks for sharing. My VLF TX is coming along very quickly now that I have abit of time in=20 the shack on a daily basis. The driver stage is complete and tested and= =20 I start the h-bridge tonight. Hoping for low power tests this weekend into the 0.5km Earth loop and=20 when my vast horde of caps arrives I'll run QRPP tests into the loop=20 before jacking up the juice. More details soon. 73 Scott VE7TIL On 4/13/2011 11:16 AM, Stefan Sch=E4fer wrote: > Ah OK, sorry Scott. I haven't proved the document, just forwarded the=20 > link and checked the first page. Theoretical stuff isn't my central=20 > interest, you know ;-) > > 73, Stefan/DK7FC > > Am 13.04.2011 18:02, schrieb Scott Tilley: >> Hi Stefan/group >> >> This looks it may be the link or at least a very interesting one: >> >> http://www.navy-radio.com/manuals/0101-1xx/0101_113-02.pdf >> >> 73 Scott >> VE7TIL >> >> On 4/13/2011 5:28 AM, Stefan Sch=E4fer wrote: >>> VLF, >>> >>> Am 12.04.2011 23:30, schrieb Stefan Sch=E4fer: >>>> VLF, >>>> >>>> I've just got these graphs by a SWL (or better LWL) out of an=20 >>>> unknown paper. >>> >>> Now i've got the URL for this document: >>> >>> www.navy-radio.com/manuals/0101-1xx/0101_113-06.pdf >>> >>> >>> 73, Stefan/DK7FC >>> >>> >>> >>>> It shows the results of field strength achievements as a function=20 >>>> of the TX frequency for different distances and a given TX power. >>>> Have we all known about this? Me not ;-) Now i understand why the=20 >>>> military stations are located mostly between 15 and 25 kHz... >>>> But 8970 Hz is not much worse, at least distances below 4000 km... >>>> >>>> But that graph tell me it is rather difficult to reach TF3HZ or=20 >>>> 4X1RF on 5170 Hz. Anyway we'll see... >>>> >>>> 73, Stefan/DK7FC >>> >>> >> > >