Return-Path: Received: (qmail 94088 invoked from network); 23 Nov 2004 13:20:36 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 23 Nov 2004 13:20:36 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CWab7-000Mxx-BT for dave@picks.force9.co.uk; Tue, 23 Nov 2004 13:20:46 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CWab6-000Mxl-Pk for dave@picks.force9.co.uk; Tue, 23 Nov 2004 13:20:44 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1CWaaw-0007vP-3R for dave@picks.force9.co.uk; Tue, 23 Nov 2004 13:20:34 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CWaaM-0008K4-Hb for rs_out_1@blacksheep.org; Tue, 23 Nov 2004 13:19:58 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CWaaM-0008Jv-6i for rsgb_lf_group@blacksheep.org; Tue, 23 Nov 2004 13:19:58 +0000 Received: from one.surfree.co.uk ([195.80.0.234]) by relay.thorcom.net with esmtp (Exim 4.41) id 1CWaaF-0008N2-61 for rsgb_lf_group@blacksheep.org; Tue, 23 Nov 2004 13:19:58 +0000 Received: from standalone ([212.248.140.49]) by one.surfree.co.uk (8.9.3/8.9.3) with SMTP id OAA00966 for ; Tue, 23 Nov 2004 14:15:43 GMT Received: by localhost with Microsoft MAPI; Tue, 23 Nov 2004 13:17:23 -0000 Message-ID: <01C4D15E.C5205CE0.actalbot@southsurf.com> From: Andy To: "'rsgb_lf_group@blacksheep.org'" Date: Tue, 23 Nov 2004 13:17:22 -0000 Importance: high X-Priority: 1 (Highest) Organization: UKNWN(UK) X-Mailer: Microsoft Internet E-mail/MAPI - 8.0.0.4211 MIME-Version: 1.0 X-SPF-Result: relay.thorcom.net: 195.80.0.234 is neither permitted nor denied by domain of southsurf.com X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=no,RCVD_IN_SORBS=0.1,X_PRIORITY_HIGH=0.516 Subject: LF: Linear amplifiers , MSK, and 500kHz Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.5 required=5.0 tests=X_PRIORITY_HIGH 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) Has anyone got anywhere with developing soundcard based MSK ? Surely that is the next obvious move on LF where switch mode PAs rule and a linear PA isn't a realistic option for high powers, knocking PSK31 on the head. Just as a novel test (at very low poer of course :-) I tried tuning up the T antenna at 500kHz. A variometer purchased at a junk sale a few years ago - an old NDB thing I guess, that tunes over 100 to 400nH, worked instantly, and I had about 30 - 40 ohms antenna resistance at resonance. Any moves on that band ??? Andy G4JNT