Return-Path: Received: (qmail 21349 invoked from network); 12 Mar 2001 23:27:06 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 12 Mar 2001 23:27:06 -0000 Received: (qmail 4522 invoked from network); 12 Mar 2001 23:26:45 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 12 Mar 2001 23:26:45 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14cbaX-00006V-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 12 Mar 2001 23:18:53 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from smtp7vepub.gte.net ([206.46.170.28] helo=smtp7ve.mailsrvcs.net) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14cbaW-00006Q-00 for rsgb_lf_group@blacksheep.org; Mon, 12 Mar 2001 23:18:52 +0000 Received: from ieee.org (client-151-200-117-29.bellatlantic.net [151.200.117.29]) by smtp7ve.mailsrvcs.net (8.9.1/8.9.1) with ESMTP id XAA10664730; Mon, 12 Mar 2001 23:25:47 GMT X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3AAD5471.B0FB0E17@ieee.org> Date: Mon, 12 Mar 2001 17:57:53 -0500 From: "Andre' Kesteloot" X-Mailer: Mozilla 4.7 [en]C-CCK-MCD NSCPCD47 (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: active antennas at LF. References: <65AECDF1F89AD411900400508BFC869F9C03BE@pdw-mail-1.dera.gov.uk> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Talbot Andrew wrote: > Incidently, returning to an earlier topic, the current Naval standard HF > receiving antenna on board ships is an active whip, made from a 2m > length of 50mm diameter Al pole. The amp is made from three E88CC > valves in parallel, operating in a cascode / common collector circuit. Indeed, in case of EMP, a valve preamplifier would have better chances of surviving. Andre' N4ICK