Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me02.r1000.mx.aol.com (Internet Inbound) with ESMTP id A50DC380000A2; Mon, 15 Aug 2011 07:04:17 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Qsuwn-00049m-AR for rs_out_1@blacksheep.org; Mon, 15 Aug 2011 12:03:09 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Qsuwm-00049d-Sl for rsgb_lf_group@blacksheep.org; Mon, 15 Aug 2011 12:03:08 +0100 Received: from mail-pz0-f42.google.com ([209.85.210.42]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Qsuwj-0000gF-Je for rsgb_lf_group@blacksheep.org; Mon, 15 Aug 2011 12:03:08 +0100 Received: by pzk37 with SMTP id 37so2718757pzk.1 for ; Mon, 15 Aug 2011 04:02:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=56pKPhkBoyKy/TfchOgMJN1eL+XZcVIj+sJTV9jC4mA=; b=EBtT0tGmHRnNihI7dFeyt+18rvgwP9hjBkDeTaQ6jSEbzRQbQQZGojRydhE0DAuF0/ cUPlaQeJeXYBzzMHDGYUfTY9TAe5B0HIm6ogNdA+gheizKC4KmpeTjck9LryEHfcK1n2 SOQNlqIa3fK1OTnm4V6oLhHrku+qr6czovNnc= MIME-Version: 1.0 Received: by 10.142.2.28 with SMTP id 28mr1853475wfb.392.1313406177672; Mon, 15 Aug 2011 04:02:57 -0700 (PDT) Received: by 10.142.188.7 with HTTP; Mon, 15 Aug 2011 04:02:57 -0700 (PDT) In-Reply-To: <17BB4B3F-F338-4973-8F87-BD710C9C1539@numeo.fr> References: <8F12A13F-4174-4C0F-8916-1543A69C2E65@gmail.com> <17BB4B3F-F338-4973-8F87-BD710C9C1539@numeo.fr> Date: Mon, 15 Aug 2011 12:02:57 +0100 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Ferrite rods Content-Type: multipart/alternative; boundary=00504502ad51aa7df504aa89340e 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=HTML_20_30,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-SCOLL-SCORE: 0:2:456457024:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m018.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d608a4e48fd307ee8 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --00504502ad51aa7df504aa89340e Content-Type: text/plain; charset=ISO-8859-1 Is this PhD document publically available as a PDF John? 73s Roger G3XBM On 15 August 2011 11:26, John Rabson wrote: > There is an extensive discussion of ferrite rod antennas in Chapter 4 of: > > Gibson, David (2004) Channel Characterisation and System Design for > Sub-Surface Communications PhD thesis, Leeds University 2004. > > John > F5VLF > > On 15 Aug 2011, at 09:46CEST, Roger Lapthorn wrote: > > > Although I've little experience of ferrite rods on LF receive I did wind > my 600uH 500kHz ATU loading coil for my 5w transverter on one. With just a > 5m top loaded vertical it worked well without saturation problems when > sitting on the bedroom table. At QRP it is less lossy as less wire is > needed. > > > > People have successfully engineered (single turn I think) ferrite rods as > TX antennas for 10MHz QRPp WSPR. Somewhere I have some information on this. > As long as saturation is avoided there is some mileage for HF TX > applications in very compact QRP stations. > > > > Worth some experiments on LF receive Stefan. > > > > 73s > > Roger G3XBM > > > > Via my iPod Touch 4g 2.4GHz handheld. > > > > > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm https://sites.google.com/site/sub9khz/ --00504502ad51aa7df504aa89340e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Is this PhD document publically available as a PDF John?

73s
Roge= r G3XBM

On 15 August 2011 11:26, John Rab= son <john.rabs= on@numeo.fr> wrote:
There is an extensive discussion of ferrite= rod antennas in Chapter 4 of:

=A0 =A0 =A0 =A0Gibson, David (2004) Channel Characterisation and System De= sign for Sub-Surface Communications PhD thesis, Leeds University 2004.

John
F5VLF

On 15 Aug 2011, at 09:46CEST, Roger Lapthorn wrote:

> Although I've little experience of ferrite rods on LF receive I di= d wind my 600uH 500kHz ATU loading coil for my 5w transverter on one. =A0Wi= th just a 5m top loaded vertical it worked well without saturation problems= when =A0sitting on the bedroom table. At QRP it is less lossy as less wire= is needed.
>
> People have successfully engineered (single turn I think) ferrite rods= as TX antennas for 10MHz QRPp WSPR. Somewhere I have some information on t= his. As long as saturation is avoided there is some mileage for HF TX appli= cations in very compact QRP stations.
>
> Worth some experiments on LF receive Stefan.
>
> 73s
> Roger G3XBM
>
> Via my iPod Touch 4g 2.4GHz handheld.
>





--
http://g3xbm-qrp.blogspot= .com/
http://ww= w.g3xbm.co.uk
http://www.= youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/

--00504502ad51aa7df504aa89340e--