Return-Path: Received: from mtain-dc11.r1000.mx.aol.com (mtain-dc11.r1000.mx.aol.com [172.29.64.139]) by air-di06.mail.aol.com (v127_r1.1) with ESMTP id MAILINDI062-eacb4b82a5c4f4; Mon, 22 Feb 2010 10:41:56 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dc11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 61F8F38000129; Mon, 22 Feb 2010 10:41:54 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NjaP9-0001bG-OF for rs_out_1@blacksheep.org; Mon, 22 Feb 2010 15:41:03 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NjaP9-0001b6-6A for rsgb_lf_group@blacksheep.org; Mon, 22 Feb 2010 15:41:03 +0000 Received: from mtaout01-winn.ispmail.ntl.com ([81.103.221.47]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NjaP6-0002Zk-VF for rsgb_lf_group@blacksheep.org; Mon, 22 Feb 2010 15:41:03 +0000 Received: from know-smtpout-4.server.virginmedia.net ([62.254.123.1]) by mtaout01-winn.ispmail.ntl.com (InterMail vM.7.08.04.00 201-2186-134-20080326) with ESMTP id <20100222154054.SURE4204.mtaout01-winn.ispmail.ntl.com@know-smtpout-4.server.virginmedia.net> for ; Mon, 22 Feb 2010 15:40:54 +0000 Received: from [86.31.219.178] (helo=desktop) by know-smtpout-4.server.virginmedia.net with esmtp (Exim 4.63) (envelope-from ) id 1NjaP0-0002R6-0n for rsgb_lf_group@blacksheep.org; Mon, 22 Feb 2010 15:40:54 +0000 From: "James Cowburn" To: References: <32098189.1842344.1266827344324.JavaMail.fmail@mwmweb080> <38A51B74B884D74083D7950AD0DD85E82A1B04@File-Server-HST.hst.e-technik.tu-darmstadt.de> <9afca2641002220203x1671635et5ec5b31b691fc46e@mail.gmail.com> <4B826B4F.9060202@iup.uni-heidelberg.de> <20100222145036.5661AF3864@smtps02.kuleuven.be> <9afca2641002220729v30122b70k1624ce6576ec724c@mail.gmail.com> Date: Mon, 22 Feb 2010 15:40:53 -0000 Message-ID: <011e01cab3d5$6b75f920$0217aac0@desktop> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 In-Reply-To: <9afca2641002220729v30122b70k1624ce6576ec724c@mail.gmail.com> Thread-Index: Acqz1A081+AfT9eiRNqMXPIvTy8xRgAARt/g X-Cloudmark-Analysis: v=1.1 cv=ZtHxNT4mZm3rCuM0SmWmgWxeBwJsziC8EqOrwwVkrhA= c=1 sm=0 a=8RloEfZUAAAA:8 a=F3M5lZpKAAAA:8 a=fnYqA7hvAAAA:8 a=j6Q1dnSHAAAA:8 a=A06HpNCPAAAA:20 a=sM9o4fZmomUROB6xvIsA:9 a=sBCBc_wTP0REnwJ6mlEA:7 a=qrdMry04Nkox87L-huP3j1OFBKoA:4 a=O58u2wXj750A:10 a=wk6s2zzMB60A:10 a=gA6IeH5FQcgA:10 a=NWVoK91CQyQA:10 a=Nw-gdm4dIrdVRGI1:21 a=npBM0LmRUCLOdjSO:21 a=SSmOFEACAAAA:8 a=eeuRTDgHSEXUkVsFjD4A:9 a=T8bN77vsV6J6xCCDkN8A:7 a=TiWj_80Yt6t1YCJ7RZCDajC4hHMA:4 a=HtYGFMcs0BjHdSPD:21 a=LeTUmskCEG_B0gLl:21 a=HpAAvcLHHh0Zw7uRqdWCyQ==:117 X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,HTML_FONT_BIG=0.256,HTML_MESSAGE=0.001 Subject: RE: LF: VLF_8.79 kHz Content-Type: multipart/alternative; boundary="----=_NextPart_000_011F_01CAB3D5.6B75F920" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=EXCUSE_16,HTML_60_70, HTML_FONTCOLOR_UNKNOWN,HTML_FONT_BIG,HTML_MESSAGE 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: 3039ac1d408b4b82a5c23d44 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_011F_01CAB3D5.6B75F920 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Given that virtually nothing is radiated then is it really "radio"?? Or could it be in fact our own version of PLT?? Albeit at very uber vlf and using the earth as the mains? Discuss? With best regards Jim Dr. James Cowburn E james.cowburn@virgin.net The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you are not the intended recipient, you are hereby notified that you must not read this message. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. Consequently, this email is not intended to be contractually binding. If you received this in error, please contact the sender, return the message as well as its attachments and delete the whole from any computer. _____ From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Roger Lapthorn Sent: 22 February 2010 15:29 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: VLF_8.79 kHz Rick, Horst, et al, I am unsure of the "official" UK position regarding operation below 9kHz. Back in the late 1960s a Test and Development Licence was required and I held two around 1970 (G9BIB and G9BGU) for "earth mode" experiments between 0 and 50kHz. If you ask OFCOM I suspect they will require you to have a special permit (NoV), HI. It would be very interesting to know just how far amateurs could communicate below 9kHz. Amplifiers of 500-1000W coupled with the very best in weak signal modes and widely spaced grounded electrodes or large induction loops might result in the 10km barrier, achieved some years ago, being exceeded. ERP is meaningless at these frequencies as virually nothing will be radiated: communication will be by conduction through the ground or by induction. 73s Roger G3XBM On 22 February 2010 14:50, Rik Strobbe wrote: And do you know if f<9kHz is free for other countries in europe as well? What about the UK? Stefan, in Belgium anything below 9kHz (and above 300GHz) is "free" 73, Rik ON7YD - OR7T -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/G3XBM G3XBM GQRP 1678 ISWL G11088 ------=_NextPart_000_011F_01CAB3D5.6B75F920 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Given that virt= ually nothing is radiated then is it really “radio”??   Or could it be in= fact our own version of PLT?? Albeit at very uber vlf and using the earth as the ma= ins?   Discuss?

With best regards=

 

 

Jim

 

 

Dr. James Cowbu= rn

E jame= s.cowburn@virgin.net

 

The information= transmitted is intended only for the person to whom it is addressed and may contain confidential and/or pri= vileged material. If you are not the intended recipient, you are hereby notifi= ed that you must not read this message.
Any review, retransmission, dissemination or other use of, or taking= of any action in reliance upon, this information by persons or entities other= than the intended recipient is prohibited.  Consequently, this email is no= t intended to be contractually binding.
If you received this in error, please contact the sender, return the= message as well as its attachments and delete the whole from any computer.=

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksh= eep.org] On Behalf Of R= oger Lapthorn
Sent: 22 February 2010= 15:29
To: rsgb_lf_group@black= sheep.org
Subject: Re: LF: VLF_8.= 79 kHz

 

Rick, Horst, et al,

 

I am unsure of the "official" UK position regarding operation below 9kHz. Back in the late 1960s a Test and Development Licence was= required and I held two around 1970 (G9BIB and G9BGU) for "earth mode"= ; experiments between 0 and 50kHz.  If you ask OFCOM I suspect they= will require you to have a special permit (NoV), HI.

 

It would be very interesting to know just how= far amateurs could communicate below 9kHz. Amplifiers of 500-1000W coupled with the very= best in weak signal modes and widely spaced grounded electrodes or large induc= tion loops might result in the 10km barrier, achieved some years ago, being exceeded. ERP is meaningless at these frequencies as virually nothing= will be radiated: communication will be by conduction through the ground or by induction.

 

73s

Roger G3XBM

 



 

On 22 February 2010 14:50, Rik Strobbe <rik.strobbe@fys.kuleuven.= be> wrote:


And do you know if f<9kHz is free for other countries in europe as well? What about the UK?=

 

Stefan,

in Belgium anything below 9kHz (and above 300GHz) is "free"

73, Rik  ON7YD - OR7T




--

http://g3xbm-qrp.blogspot.c= om/
http://www.g3xbm.co.uk
http://www.youtube.com/u= ser/G3XBM
G3XBM    GQRP 1678      ISWL G11088

------=_NextPart_000_011F_01CAB3D5.6B75F920--