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[195.171.43.25]) by mx.google.com with ESMTP id dm2si23439472pbb.68.2014.06.23.13.36.51 for ; Mon, 23 Jun 2014 13:36:52 -0700 (PDT) Received-SPF: none (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1WzAxK-0002df-75 for rs_out_1@blacksheep.org; Mon, 23 Jun 2014 21:35:10 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WzAxJ-0002dW-U9 for rsgb_lf_group@blacksheep.org; Mon, 23 Jun 2014 21:35:09 +0100 Received: from mail-qa0-f50.google.com ([209.85.216.50]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.82) (envelope-from ) id 1WzAxH-0007aE-Nn for rsgb_lf_group@blacksheep.org; Mon, 23 Jun 2014 21:35:08 +0100 Received: by mail-qa0-f50.google.com with SMTP id m5so6108063qaj.23 for ; Mon, 23 Jun 2014 13:35:05 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=5VMvI3ECvKlQ1OLX4uVYWCUHB/EWi0XuopLTh9hOALA=; b=XBPVSrN1JkucjQr9dX1/EPlLzpc8TFFep2JId47IMOcU9JZOAf1Jy/Bc4seYJHQTY2 js3+Nd1PpXc55E4xDdew7lEstnGaY4WggBuxI5inVWNVq0rIEOzXD6Ulge/zery6eSaR 2W6cH0ptPvimuqoqkIu+6bVPOnFh+mTYL1ocNolxRjpqSl0yiTSQVGH2OGwZt7XRTdi8 lQ9E5fB9bWSB4AONkgAgF4gdhlAWF4AiN/qw6ZrLm9uuJJmLrphNxVRrRSKCONMx0YPQ 48yEgMEwZ+oC13mY3KI5WxzNkOmridpcoYWUh/ind0gA5c7Vq1vwRQ09um/I3suU73iM Dzow== MIME-Version: 1.0 X-Received: by 10.229.87.132 with SMTP id w4mr35966799qcl.20.1403555705117; Mon, 23 Jun 2014 13:35:05 -0700 (PDT) Received: by 10.229.251.202 with HTTP; Mon, 23 Jun 2014 13:35:05 -0700 (PDT) In-Reply-To: References: <1403433467.29408.YahooMailBasic@web173001.mail.ir2.yahoo.com> <1WyhZD-2GWXa40@fwd29.t-online.de> Date: Mon, 23 Jun 2014 21:35:05 +0100 Message-ID: From: Roger Lapthorn To: "rsgb_lf_group@blacksheep.org" X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Joe, Alternatives are a large TX loop or even a large earth-electrode antenna. You'll need some high voltage caps but no large coils to wind. 73s Roger G3XBM [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.216.50 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (rogerlapthorn[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 32d4aaaf019758ff5a0d8e92eec683e6 Subject: Re: LF: VLF in Canada Content-Type: multipart/alternative; boundary=001a113381903a270304fc86c71c X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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 --001a113381903a270304fc86c71c Content-Type: text/plain; charset=ISO-8859-1 Joe, Alternatives are a large TX loop or even a large earth-electrode antenna. You'll need some high voltage caps but no large coils to wind. 73s Roger G3XBM On 23 June 2014 20:33, wrote: > Dear Group, > > I tried again to get an LOA for VLF. This time, the response from > Industry Canada was favourable: 10 mW 8.0-8.3 kHz. Yesterday, after a few > slight rf burns, and thanks to PA0RDT's miniwhip design and DL4YHF's > Spectrum Lab and advice, VLF sigs on 8.277 kHz were heard at 200m from the > 100m wire aerial. This was a reception outside my back yard! 10 watts from > an 1970's keyboard amp (volume control set on 3) were stepped up with an > xfmr to a lossy 500 ohm tuning coil peaked with a ferrite rod for maximum > squeal at L=0.35 H. > > Is it possible for someone who is not especially enthralled by winding > a mile of 0.7mm wire to use an iron core to make a VLF tuning coil? > > 73 > Joe VO1NA > > --001a113381903a270304fc86c71c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Joe,

Alternatives are a large = TX loop or even a large earth-electrode antenna. You'll need some high = voltage caps but no large coils to wind.

73s
Roger G3= XBM


On 23 J= une 2014 20:33, <jcraig@mun.ca> wrote:
Dear Group,

I tried again to get an LOA =A0for VLF. =A0This time, the response from Ind= ustry Canada was favourable: 10 mW 8.0-8.3 kHz. =A0Yesterday, after a few s= light rf burns, and =A0thanks to PA0RDT's miniwhip design and DL4YHF= 9;s Spectrum Lab and advice, VLF sigs on 8.277 kHz were heard at 200m from = the 100m wire aerial. This was a reception outside my back yard! =A010 watt= s from an 1970's keyboard amp (volume control set on 3) were stepped up= with an xfmr to a lossy 500 ohm tuning coil peaked with a ferrite rod for = maximum squeal at L=3D0.35 H.

Is it possible for someone who is not especially enthralled by winding
a mile of 0.7mm wire to use an iron core to make a VLF tuning coil?

73
Joe VO1NA


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