Return-Path: Received: (qmail 20625 invoked from network); 8 Feb 2001 04:06:19 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by 10.226.25.101 with SMTP; 8 Feb 2001 04:06:19 -0000 Received: (qmail 5760 invoked from network); 8 Feb 2001 04:10:02 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 8 Feb 2001 04:10:02 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14QiId-0001la-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 08 Feb 2001 04:03:15 +0000 Received: from imo-r02.mx.aol.com ([152.163.225.2]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14QiIb-0001lV-00 for rsgb_lf_group@blacksheep.org; Thu, 08 Feb 2001 04:03:13 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from WarmSpgs@aol.com by imo-r02.mx.aol.com (mail_out_v29.5.) id l.85.69a315b (3968) for ; Wed, 7 Feb 2001 23:02:14 -0500 (EST) From: WarmSpgs@aol.com Message-ID: <85.69a315b.27b37446@aol.com> Date: Wed, 7 Feb 2001 23:02:14 EST Subject: Re: LF: Re: CW-Keying via Soundcard or PC speaker To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit X-Mailer: AOL 4.0 for Windows 95 sub 120 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: The problem with using a soundcard output to a mic input is not in the programming aspect, but is a question of efficiency and possibly power dissipation. Guys who key Class C, D, and E amplifiers have enough trouble with the duty cycle of QRSS sometimes. Imagine what a linear amp for SSB might do at full carrier continuously for a minute. It's really, really much easier to optoisolate an I/O port and use old fashioned on-off keying in most cases. 73, John