Return-Path: Received: (qmail 56568 invoked from network); 27 Feb 2005 11:51:01 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore04.plus.net with SMTP; 27 Feb 2005 11:51:01 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1D5MyB-000BFt-Bu for dave@picks.force9.co.uk; Sun, 27 Feb 2005 11:52:20 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1D5My9-000BF9-Sl for dave@picks.force9.co.uk; Sun, 27 Feb 2005 11:52:17 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1D5MyU-0007R3-UN for dave@picks.force9.co.uk; Sun, 27 Feb 2005 11:52:39 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1D5Mtx-0000QD-9H for rs_out_1@blacksheep.org; Sun, 27 Feb 2005 11:47:57 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1D5Mtw-0000Po-Ic for rsgb_lf_group@blacksheep.org; Sun, 27 Feb 2005 11:47:56 +0000 Received: from smtp.bulldogdsl.com ([83.146.21.7]) by relay.thorcom.net with esmtp (Exim 4.43) id 1D5Mtu-0003VS-Qd for rsgb_lf_group@blacksheep.org; Sun, 27 Feb 2005 11:47:56 +0000 Received: by smtp.bulldogdsl.com (Postfix, from userid 1002) id 04ADC1EF66A; Sun, 27 Feb 2005 11:47:38 +0000 (GMT) Received: from [192.168.1.33] (host-84-9-92-201.bulldogdsl.com [84.9.92.201]) by smtp.bulldogdsl.com (Postfix) with ESMTP id 060641F02F4 for ; Sun, 27 Feb 2005 10:17:04 +0000 (GMT) Received: from 127.0.0.1 (AVG SMTP 7.0.298 [266.3.0]); Sun, 27 Feb 2005 10:17:01 +0000 Message-ID: <003501c51cb5$7a61b850$2101a8c0@AUG2004> From: "Walter Blanchard" To: rsgb_lf_group@blacksheep.org Date: Sun, 27 Feb 2005 10:16:58 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2527 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 X-SPF-Result: relay.thorcom.net: 83.146.21.7 is neither permitted nor denied by domain of pncl.co.uk X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=failed,HTML_50_60=0.095,HTML_MESSAGE=0.001 Subject: LF: 807 Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

Laurie,

I've been using an LF preselector with an EF37 amp for some years - otherwise known as the R107 LF unit! I did a little article for RADCOM sometime in 1964 about the theory of those 807 distribution amplifiers and how to make one. It was their linearlity with big signals that made them so useful. Most warships used them so they could put out kW nearby and still be able to listen.

Walter G3JKV.