Return-Path: Received: (qmail 16748 invoked from network); 25 Mar 1999 09:26:48 -0000 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by medusa.plus.net.uk with SMTP; 25 Mar 1999 09:26:48 -0000 Received: (qmail 32157 invoked from network); 25 Mar 1999 09:29:45 -0000 Received: from post.thorcom.com (194.75.130.70) by magnus.plus.net.uk with SMTP; 25 Mar 1999 09:29:45 -0000 Received: from troy.blacksheep.org ([194.75.183.50] ident=root) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10Q6M8-0008JG-00 for dave@picks.force9.co.uk; Thu, 25 Mar 1999 09:23:16 +0000 Received: (from root@localhost) by troy.blacksheep.org (8.6.12/8.6.12) id JAA16406 for rsgb_lf_group-outgoing; Thu, 25 Mar 1999 09:17:40 GMT Received: from post.thorcom.com (root@post.unica.co.uk [194.75.183.70]) by troy.blacksheep.org (8.6.12/8.6.12) with ESMTP id IAA16332 for ; Thu, 25 Mar 1999 08:59:48 GMT Received: from mb04.swip.net ([193.12.122.208]) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10Q5z8-0004a8-00 for rsgb_lf_group@blacksheep.org; Thu, 25 Mar 1999 08:59:30 +0000 Received: from s-257519 (dialup49-4-51.swipnet.se [130.244.49.243]) by mb04.swip.net (8.8.8/8.8.8) with SMTP id JAA22411 for ; Thu, 25 Mar 1999 09:59:28 +0100 (MET) Message-ID: <002401be769d$ac89af00$f331f482@s-257519> From: "Johan Bodin" To: rsgb_lf_group@blacksheep.org Subject: LF: TDA2030 as LF PA? Date: Thu, 25 Mar 1999 09:57:29 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Hello, I remember reading about a TDA2030 PA for 137 kHz but I cannot find the text now. I found a few TDA2030s in my junk box and decided to try them in a small linear PA for PSK31 experiments. I think I'll go for a bridge configuration using two TDA2030s and a 1" 3F3 toroid as output transformer. According to the data sheet, the device seems virtually indestructible and open loop gain is still 35 dB at 140 kHz so the feedback will hopefully do some good for the linearity. Anyone out there who has experience of using the TDA2030 on 137 kHz? Any special tricks? 73 de Johan, SM6LKM