Return-Path: Received: (qmail 20147 invoked from network); 6 Dec 2000 12:34:54 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by extortion.plus.net with SMTP; 6 Dec 2000 12:34:54 -0000 Received: (qmail 23039 invoked from network); 6 Dec 2000 12:36:58 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 6 Dec 2000 12:36:58 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 143dbq-0004Zp-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 06 Dec 2000 12:23:42 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 143dbl-0004Zj-00 for rsgb_lf_group@blacksheep.org; Wed, 06 Dec 2000 12:23:38 +0000 Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id MAA10255; Wed, 6 Dec 2000 12:23:47 GMT Received: (qmail 12994 invoked from network); 6 Dec 2000 12:22:13 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 6 Dec 2000 12:22:13 -0000 Received: by gauntlet.mail.dera.gov.uk; id MAA20873; Wed, 6 Dec 2000 12:58:13 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma020673; Wed, 6 Dec 00 12:57:22 GMT Received: from frn-gold-1.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Wed, 6 Dec 2000 12:23:59 +0000 Received: by frn-gold-1.dera.gov.uk with Internet Mail Service (5.0.1460.8) id ; Wed, 6 Dec 2000 12:22:38 -0000 Message-ID: <65AECDF1F89AD411900400508BFC869F0D7463@pdw-mail-1.dera.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: LF: Re: LF keep cool Date: Wed, 6 Dec 2000 12:22:37 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.0.1460.8) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Some of us don't have such large antennas as you, Peter. For 1 Watt ERP I would need approx 4kW RF. Anyone got any cheap 3 phase 500V bridge rectifiers ? The Litz wire around surplus now will do a better job at keeping cool than copper tube at these frequencies. Andy G4JNT > With a transmitter running 900watts I can get 1watt erp even with my > 'bit of wet string' so there is no need to run more power. To get > 1watt erp I have to obtain 4.5amps antenna current with my antenna. > The coil is wound with 1.5mm Litz wire (2.5mm including plastic > insulation) with an RF resistance of approximately 5ohms and will > dissipate around 100 watts during key-down periods. -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.