Return-Path: X-Spam-DCC: paranoid 1102; 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=-1.0 required=5.0 tests=BAYES_00,DATE_IN_PAST_12_24, DNS_FROM_AHBL_RHSBL,HTML_50_60,HTML_MESSAGE 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 tAT9Xsg8030332 for ; Sun, 29 Nov 2015 10:33:54 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a2yIy-0006TY-AI for rs_out_1@blacksheep.org; Sun, 29 Nov 2015 09:30:00 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a2yIx-0006TK-NL for rsgb_lf_group@blacksheep.org; Sun, 29 Nov 2015 09:29:59 +0000 Received: from out1.ip07ir2.opaltelecom.net ([62.24.128.243]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a2yHt-0002n2-Hi for rsgb_lf_group@blacksheep.org; Sun, 29 Nov 2015 09:29:58 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: A2CiFAB2xFpWPKyNH1xdGQEBAgsBAgEBAQEBgj5NgUKGX6lCj3iGCQQCAoEYTQEBAQEBAQcBAQEBQAE/QQEECwGDYgEBAQEDCBszLgUFAwMEDQQBASsCAiEYCgwIBhMICYgIAxapYosKDYQ/DAEgikyBBoJTglSCTi+BFQWWVwGBKIoYlwGHV4J/gWg+NIEGeYNyAQEB X-IPAS-Result: A2CiFAB2xFpWPKyNH1xdGQEBAgsBAgEBAQEBgj5NgUKGX6lCj3iGCQQCAoEYTQEBAQEBAQcBAQEBQAE/QQEECwGDYgEBAQEDCBszLgUFAwMEDQQBASsCAiEYCgwIBhMICYgIAxapYosKDYQ/DAEgikyBBoJTglSCTi+BFQWWVwGBKIoYlwGHV4J/gWg+NIEGeYNyAQEB X-IronPort-AV: E=Sophos;i="5.20,360,1444690800"; d="scan'208,217";a="323350863" Received: from host-92-31-141-172.as13285.net (HELO malPC) ([92.31.141.172]) by out1.ip07ir2.opaltelecom.net with SMTP; 29 Nov 2015 09:40:23 +0000 Message-ID: From: "mal hamilton" To: References: <56587F40.5070709@posteo.de><87FFCE57-D2D7-4616-B5E8-B84CD819C685@talktalk.net><5658E894.6090208@posteo.de><82B8809C-36E5-4731-8A4B-002BD4465B12@talktalk.net><5658EE97.2020107@posteo.de> In-Reply-To: Date: Sat, 28 Nov 2015 18:20:29 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3555.308 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308 X-Scan-Signature: 42bbe44aa18353e845a65753486d556c Subject: Re: 3 phase (was LF: G3KEV) Content-Type: multipart/alternative; boundary="----=_NextPart_000_02C5_01D12A09.76306390" 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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 5417 This is a multi-part message in MIME format. ------=_NextPart_000_02C5_01D12A09.76306390 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Andy es Co 6 phase even better lower ripple. A car alternator is 3 phase, could easily be 6 g3kev From: Andy Talbot=20 Sent: Saturday, November 28, 2015 4:26 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: 3 phase (was LF: G3KEV) What's wrong with that ?=20 Sounds an excellent idea for a QRO transmitter. 300Hz ripple - much = easier to filter out. My 137kHz Tx runs from rectified (single phase) mains - the isolation is = provided in the ferrite output transformer and FET drive pot-core A school we once went around with long leads and an AVO identifying = sockets to be found on all three of the phases. That was so that, using = extension leads, we could bring them all into the lab to get a three = phase motor running. Such interesting things could be done in schools = in the 1970's Andy G4JNT On 28 November 2015 at 15:52, John Rabson = wrote: In the early days of 73 kHz I believe a Luxembourg station built a = transmitter which was powered off full-wave rectified three-phase mains = without an isolating transformer. NOT the best way of doing things! John F5VLF ------=_NextPart_000_02C5_01D12A09.76306390 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Andy es Co
6 phase even better lower ripple.
A car alternator is 3 phase, could easily be 6
g3kev
 
 
 
Sent: Saturday, November 28, 2015 4:26 PM
Subject: Re: 3 phase (was LF: G3KEV)
 
What's wrong with that ?=20
Sounds an excellent idea for a QRO transmitter.   300Hz = ripple -=20 much easier to filter out.
 
My 137kHz Tx runs from rectified (single phase) mains - the = isolation is=20 provided in the ferrite output transformer and FET drive = pot-core
 
A school we once went around with long leads and an AVO  = identifying=20 sockets to be found on all three of the phases.  That was so that, = using=20 extension leads, we could bring them all into the lab to get a three = phase motor=20 running.   Such interesting things could be done in schools in = the=20 1970's
 
Andy G4JNT
 
 
On 28 November 2015 at 15:52, John Rabson <john.rabson07@gmail.com> wrote:

In the early days of 73 kHz I believe a = Luxembourg=20 station built a transmitter which was powered off full-wave rectified=20 three-phase mains without an isolating transformer. NOT the best way = of doing=20 things!

John=20 F5VLF
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