Return-Path: Received: (qmail 26587 invoked from network); 1 Apr 2003 04:49:07 -0000 Content-Transfer-Encoding: 8bit Received: from netmail02.services.quay.plus.net (212.159.14.221) by mailstore with SMTP; 1 Apr 2003 04:49:07 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 12878 invoked by uid 10001); 1 Apr 2003 04:49:06 -0000 Received: from post.thorcom.com (193.82.116.70) by netmail02.services.quay.plus.net with SMTP; 1 Apr 2003 04:49:06 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 190Dgy-00028V-OU for rsgb_lf_group-outgoing@blacksheep.org; Tue, 01 Apr 2003 05:48:12 +0100 Received: from [195.22.0.29] (helo=jubilee.esoterica.pt) by post.thorcom.com with esmtp (Exim 4.14) id 190Dgr-00028M-II for rsgb_lf_group@blacksheep.org; Tue, 01 Apr 2003 05:48:05 +0100 Received: from slave-5 (por243.esoterica.pt [195.22.5.243]) by jubilee.esoterica.pt (8.12.3/8.11.6) with SMTP id h314YnG5026635 for ; Tue, 1 Apr 2003 05:34:50 +0100 Message-ID: <3.0.5.32.20030401044655.007f7b20@pop.vianw.pt> X-Sender: nx4ywv@pop.vianw.pt X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.5 (32) Date: Tue, 01 Apr 2003 04:46:55 +0100 To: rsgb_lf_group@blacksheep.org From: "Brian Rogerson" In-reply-to: <001a01c2f7c3$800834a0$92e086d4@erica> References: <000501c2f7a3$1f8d9ea0$07d2fc3e@ian> <003101c2f7b3$1954f500$cbe8fc3e@l8p8y6> MIME-Version: 1.0 Subject: Re: LF: Loading coils and Decca 5501 screening Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=-26.1 required=5.0tests=EMAIL_ATTRIBUTION,IN_REP_TO,QUOTED_EMAIL_TEXT,REFERENCES, REPLY_WITH_QUOTESversion=2.51 X-Spam-Checker-Version: SpamAssassin 2.51 (1.174.2.5-2003-03-20-exp) X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hi all Only slightly off topic, but about two years ago now someone described completing the screening on a Decca 5501. I have lost the posting but I seem to remember that something "got hot". Does anyone have the posting still? Brian CT1DRP At 21:17 31/03/2003 +0100, you wrote: > >> NEVER put your loading coil in a metal box, it totally destroys the >> efficiency. Consider it as part of the antenna from the radiation point of >> view. You have never seen a loading coil on a Mobile encased in a metal >CAN, >> the coil contributes to the over all efficiency ie coil plus whip. >> I have seen reference to encasing the loading coil here on this reflector >> that is why those signals are poor. >> My coil sits outside exposed to the elements and does not seem to be >> effected by changing wx, neither does the amps vary whether it be dry or >> wet. Recent info on here suggests heating the loading coil to increase the >> amps consumed, if this is the case the coil wire, insulation etc is very >> suspect. >> I change my antenna wire and rewind a new coil at least once a year. I >also >> check the insulated radials and change if necessary. >> Try a turkey next Xmas without the FOIL, Foil is nether good for antenna >> coils or Turkeys >> 73 de Mal/G3KEV > >The loading coil complex used by the Decca stations were located in a small >concrete building. In the early days I understand that there were problems >until the whole building was lined with copper - in other words a screened >box. >This screened box was also electrically heated. > >It is obvious that these Decca design engineers didn't know what they were >talking about. > >Regards, >Peter, G3LDO > >e-mail > >Web > > > > >