Return-Path: Received: from mtain-dd04.r1000.mx.aol.com (mtain-dd04.r1000.mx.aol.com [172.29.64.144]) by air-dd02.mail.aol.com (v129.4) with ESMTP id MAILINDD023-86584be9703d1c3; Tue, 11 May 2010 10:57:01 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dd04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 341F4380000EF; Tue, 11 May 2010 10:56:59 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OBqrg-0000tJ-HH for rs_out_1@blacksheep.org; Tue, 11 May 2010 15:55:20 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OBqrg-0000tA-1t for rsgb_lf_group@blacksheep.org; Tue, 11 May 2010 15:55:20 +0100 Received: from mail-fx0-f43.google.com ([209.85.161.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OBqrc-0003A8-QF for rsgb_lf_group@blacksheep.org; Tue, 11 May 2010 15:55:20 +0100 Received: by fxm14 with SMTP id 14so3454178fxm.16 for ; Tue, 11 May 2010 07:55:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=+5Pusp2wdEzVqPK3QBWE39Z5T8Hzb+gcHUw9BBUHg2s=; b=ZLUzOlR5NPADiDF3VSSpcYuyOgv36TsZP8NIQLk82vnUiO1RpAD+ONtN98metBHp4d jFLe07nKtrAW44zg8DyYD87z5jnXqOgxi7a3HfOJZEiN+64CpvC8pAW0Xf4ptqjBpsUY tl03hKr8a6+LQb3PgCFJ0wJ/osS8tx4VoNtbE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=fr7CJI4tUzH58atCbELiikQuMLSgZUkfHOo4PhGH6gcT2cXNT9Q4vuG0uRbrSk6Wy8 2+yaADVaZXwGgUbNpcHkPSP99QjcxCAU6i12dcsGJoH0RZwDY1TK2gloRNTGOp2nMBMX wlNNNAzCVl+1NgitS0271pZuygt67lIaxM49Y= MIME-Version: 1.0 Received: by 10.204.140.67 with SMTP id h3mr400904bku.137.1273589710337; Tue, 11 May 2010 07:55:10 -0700 (PDT) Received: by 10.204.67.68 with HTTP; Tue, 11 May 2010 07:55:10 -0700 (PDT) In-Reply-To: <28093526.109907.1273582377168.JavaMail.fmail@mwmweb078> References: <2293BF93-1C1C-4100-A1DA-0C5A1F2241BD@hurontel.on.ca> <28093526.109907.1273582377168.JavaMail.fmail@mwmweb078> Date: Tue, 11 May 2010 15:55:10 +0100 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Re: Sub-9kHz walkabout tests Content-Type: multipart/alternative; boundary=0015174c1434463745048652b6b9 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-AUTHENTICATION: mail_rly_antispam_dkim-m288.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d40904be9703b43f9 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --0015174c1434463745048652b6b9 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable There are several sources in the UK for toroidal mains transformers with various step-down ratios. See for example http://www.airlinktransformers.com/toroidal-transformers.asp . These sell for =A312 to =A320 for ratings up to 160VA. They are available up to at= least 1kVA, but get expensive. What is the best former material to use to wind your own tapped step-up transformer for this sort of application and where can you get it? 73s Roger G3XBM On 11 May 2010 13:52, Horst St=F6cker wrote: > Hello J. B. > in the wellknown standard work of John Tailor G0AKN exactly this is the > method. He used a 70V transformer. > > And I started with an autio-transformer. too. Here the standard is 100V. > After I had blown my audio-transformer I changed to a troroidal transfor= mer > for 220/15V. > > Horst DO1KHS/DI2AN > > -----Urspr=FCngliche Nachricht----- > Von: John Bruce McCreath > Gesendet: 11.05.2010 14:33:08 > An: rsgb_lf_group@blacksheep.org > Betreff: Re: LF: Re: Sub-9kHz walkabout tests > > >Hello LFers, > > > >I'm finding the posts related to the "dreamers band" quite interesting= and > it's nice to read of the various methods > >that are being tried. Has anyone used a PA amplifier with a 70 volt > output (as used in stores, offices, etc) as a > >means of delivering some power into a pair of ground rods? > > > >73, J.B., VE3EAR > > > >LowFER Beacon "EAR" > >188.830 kHz. QRSS30 > > > > > > > > > > > > > ___________________________________________________________ > GRATIS: Movie-Flat mit =FCber 300 Top-Videos. F=FCr WEB.DE Nutzer > dauerhaft kostenlos! Jetzt freischalten unter http://movieflat.web.de > > --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --0015174c1434463745048652b6b9 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable There are several sources in the UK for toroidal mains transformers with= various step-down ratios. See for example http://www.airlinktransformers.c= om/toroidal-transformers.asp . These sell for =A312 to =A320 for ratin= gs up to 160VA.=A0 They are available up to at least 1kVA, but get expensi= ve.

What is the best former material to use to wind your own tapped step-u= p transformer for this sort of application and where can you get it?
73s
Roger G3XBM



On 11 May= 2010 13:52, Horst St=F6cker <horst.stoecker@web.de> wrote:
Hello J. B.
in the wellknown standard work of John Tailor G0AKN exactly this is the me= thod. He used a 70V transformer.

And I started with an autio-transformer. too. Here the standard is 100V.= After I had blown my audio-transformer I changed to a troroidal transform= er for 220/15V.

Horst DO1KHS/DI2AN

-----Urspr=FCngliche Nachricht-----
Von: John Bruce McCreath <weaz= le@hurontel.on.ca>
Gesendet: 11.05.2010 14:33:08
An: rsgb_lf_group@blackshe= ep.org
Betreff: Re: LF: Re: Sub-9kHz walkabout tests

>Hello LFers,
>
>I'm finding the posts related to the "dreamers band" qui= te interesting and it's nice to read of the various methods
>that are being tried. =A0Has anyone used a PA amplifier with a 70 volt= output (as used in stores, offices, etc) as a
>means of delivering some power into a pair of ground rods?
>
>73, J.B., VE3EAR
>
>LowFER Beacon "EAR"
>188.830 kHz. QRSS30
>
>
>
>
>
>
___________________________________________________________ GRATIS: Movie-Flat mit =FCber 300 Top-Videos. F=FCr WEB.DE Nutzer
dauerhaft kostenlos! Jetzt freischalten unter http://movieflat.web.de




--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
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