Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 56C6338000087; Wed, 21 Dec 2011 10:01:52 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RdNf0-00014X-2p for rs_out_1@blacksheep.org; Wed, 21 Dec 2011 15:00:50 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RdNez-00014O-NX for rsgb_lf_group@blacksheep.org; Wed, 21 Dec 2011 15:00:49 +0000 Received: from mailout04.t-online.de ([194.25.134.18]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RdNex-0006d9-4y for rsgb_lf_group@blacksheep.org; Wed, 21 Dec 2011 15:00:49 +0000 Received: from fwd19.aul.t-online.de (fwd19.aul.t-online.de ) by mailout04.t-online.de with smtp id 1RdNeu-00083f-My; Wed, 21 Dec 2011 16:00:44 +0100 Received: from [192.168.2.32] (Z2HSE+ZZQhgtGGh3H-ld+WLaw-JBwR7++Ceriv-82s+tBRcknU2MTeADNssMJ48QMM@[91.57.75.176]) by fwd19.t-online.de with esmtp id 1RdNeq-0zNCmO0; Wed, 21 Dec 2011 16:00:40 +0100 MIME-Version: 1.0 From: hajo.brandt.dj1zb@t-online.de References:<8E8D23D235D70840B6582917DF27898013DCA5F7@temps153538.tms-ltd.com> <002001ccbe60$48f22b70$0401a8c0@xphd97xgq27nyf> <1324387319.2148.14.camel@pat-compaq-evo> <1970F2FA-AF3A-4970-A74F-07C820A8D002@numeo.fr> In-Reply-To:<1970F2FA-AF3A-4970-A74F-07C820A8D002@numeo.fr> To: X-Mailer: T-Online eMail 6.08.0003 Date: 21 Dec 2011 15:00 GMT Message-ID: <1RdNeq-0zNCmO0@fwd19.t-online.de> X-ID: Z2HSE+ZZQhgtGGh3H-ld+WLaw-JBwR7++Ceriv-82s+tBRcknU2MTeADNssMJ48QMM X-TOI-MSGID: 8d6a1505-93a7-4894-bba6-c5e75b6d5c12 X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55,UNPARSEABLE_RELAY=0.001 Subject: Re: ***CECI EST UN SPAM*** Re: LF: Re: RE: Antenna ideas for Stefan Content-Type: Text/Plain; Charset="WINDOWS-1252" Content-Transfer-Encoding: 8Bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_NAME 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: 0:2:445344544:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1db4054ef1f4e00e5d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dear all, as most electric power nets at that time were direct current, tapping the tram wires carrying 500 V DC had been a possibility to get higher plate voltages for tube transmitters than the local mains voltage, often just 110 V DC. Such stories are also around in Germany. There may also have been designs using the tram wires for power and radiation! 73 Ha-Jo, DJ1ZB "John Rabson" schrieb: > On 20 Dec 2011, at 14:21CET, g4gvw wrote: > > … > > > These techniques, I recall, could involve using [… ] DC power supplies obtained > > from his local town's street-lighting system. > > At one of the Belgian amateur radio conventions at Knokke (sometime in the 1960s) I met ST2AR (I think that was his call sign). He told me that before the war he managed the tramway system for Cairo and used its overhead supply to power his transmitter. It was alleged that when he put the key down the trams all slowed down. > > John F5VLF/G3PAI/ex ON5YB/ex ON8IU >