Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u2HENW1D024182 for ; Thu, 17 Mar 2016 15:23:32 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1agYkz-0005HJ-2N for rs_out_1@blacksheep.org; Thu, 17 Mar 2016 14:18:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1agYky-0005H8-He for rsgb_lf_group@blacksheep.org; Thu, 17 Mar 2016 14:18:32 +0000 Received: from mail-vk0-x236.google.com ([2607:f8b0:400c:c05::236]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1agYkw-00084V-R5 for rsgb_lf_group@blacksheep.org; Thu, 17 Mar 2016 14:18:31 +0000 Received: by mail-vk0-x236.google.com with SMTP id k1so103866963vkb.0 for ; Thu, 17 Mar 2016 07:18:29 -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; bh=hm7nV/g86KezHShtpc2mAGag5ltRed7RG8zbE+tqFQc=; b=KWQh65WOd2p/iV91US12VjUnZmM8A6lV70qN9+n5c8l5yYPI8zuEpGvCLd4kXOJVj2 pZW+0NU5Q6JTyTbcFoyuYS0kbVFUih4zAcFIiNhdn3lB35aE2EaeQqZuEaEUqg+PlGZN LRpQdpADrKKwKQSMFMiaQOQ3QrQl/9ZGFYdi1x9NMU4nvV5tvbyHzbo/1h6NFlVL+uNh mqVQ26+DEa9wt+p8kPijRBl1sQFiX0lxEX9A5f/rCcOgayw/bwrwmHitGV5cTwr/+uro frNNTLR7s4zEEWspVNIMFQ7vDjwiPZa4L4hRLQ3PIhwpSbY7b/VW0jKyZ9NxcPBNuVxt n1+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to; bh=hm7nV/g86KezHShtpc2mAGag5ltRed7RG8zbE+tqFQc=; b=anuc+Ux7BGovhuoEVIr5n4mu8+N8WQ6CaBf2kP8txszN1t1k3DNBmnMp8Ee/Y3UnVK R8JcMEeEnxQuxrczerbJ19NA0IYFSQQI3KfbJh1Bzsye7oM+9SGujPDdPNcrwwi5DH0z JYpa3LUiQW1KsjO6vmpRwehUv95e3JTJG3O9cWDkt5Yqgg8xO0onryWTdtL8JPg5oRsL oTLkPfi49PqHjWp53OF58/mGcgdtYmhmkqFhxPq2vV0S1MqdQo0OqSfBfmkJxEwUh3QR rNtVhMiIybZnLDq6DutexURa5JrpDA24rJL5ssoPtWP19we+rSVldGs6HcuoCXygIHrh jA/A== X-Gm-Message-State: AD7BkJLQnbY7eViapNh8MNp0bAC5Cx/B2/A21KwR0NdWx6OLP3jGjd+o4jgllMAot19LCfqiB7gRNcpWoYuGmg== MIME-Version: 1.0 X-Received: by 10.31.146.5 with SMTP id u5mr6003535vkd.19.1458224307528; Thu, 17 Mar 2016 07:18:27 -0700 (PDT) Received: by 10.159.32.198 with HTTP; Thu, 17 Mar 2016 07:18:27 -0700 (PDT) In-Reply-To: <56EAAF40.20204@tele2.se> References: <8D34C58CF884ECC-1ECC-700FAE@webmail-vd008.sysops.aol.com> <8D34CA56489C6DF-2124-1A7BBA@webmail-vm017.sysops.aol.com> <1D7A91E7-DC1B-4641-95BE-FC096D8155E4@gmail.com> <56EAAF40.20204@tele2.se> Date: Thu, 17 Mar 2016 14:18:27 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 0317e2ac8ed27149e57223a21580246d Subject: Re: LF: 33 Hz QRM Content-Type: multipart/alternative; boundary=001a1143adccda8ed6052e3f4dcc 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7385 --001a1143adccda8ed6052e3f4dcc Content-Type: text/plain; charset=UTF-8 Is that to minimise skin loss in steel track ? UK Third rail is, of course, DC, and I once spent an idle moment calculating the loss if 50Hz AC were to be used with magnetic iron conductors. I think I came to the conclusion a 1MW train could probably travel a few hundred metres before it lost its power supply. andy G4JNT On 17 March 2016 at 13:21, Johan Bodin wrote: > Railway QRG is 16 2/3 Hz in Sweden too. > > 73 de Johan SM6LKM > > John Rabson wrote: > >> I seem to recall that some railway systems use at about 16 2/3 Hz (one >> third of 50 Hz) for traction. >> > ... > >> Can someone say whether my recollections are correct, please? >> >> 73 John F5VLF >> > > --001a1143adccda8ed6052e3f4dcc Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Is that to minimise skin loss in steel track ?
<= div>
UK Third rail is, of course, DC, and I once spent an idl= e moment calculating the loss if 50Hz AC were to be used with magnetic iron= conductors.=C2=A0 I think I came to the conclusion a 1MW train could proba= bly travel a few hundred metres before it lost its power supply.
=
andy=C2=A0 G4JNT

<= div class=3D"gmail_quote">On 17 March 2016 at 13:21, Johan Bodin <jhbodin@= tele2.se> wrote:
Railway = QRG is 16 2/3 Hz in Sweden too.

73 de Johan SM6LKM

John Rabson wrote:
I seem to recall that some railway systems use at about 16 2/3 Hz (one thir= d of 50 Hz) for traction.
...
Can someone say whether my recollections are correct, please?

73 John F5VLF


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