Return-Path: Received: (qmail 10925 invoked from network); 7 Mar 2001 09:48:15 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by extortion.plus.net with SMTP; 7 Mar 2001 09:48:15 -0000 Received: (qmail 680 invoked from network); 7 Mar 2001 09:48:20 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 7 Mar 2001 09:48:20 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14aaRA-0001lD-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 07 Mar 2001 09:40:52 +0000 X-Priority: 3 Received: from d06lmsgate-2.uk.ibm.com ([195.212.29.2]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14aaR8-0001ky-00 for rsgb_lf_group@blacksheep.org; Wed, 07 Mar 2001 09:40:51 +0000 X-MSMail-Priority: Normal Received: from d06relay02.portsmouth.uk.ibm.com (d06relay02.portsmouth.uk.ibm.com [9.166.84.148]) by d06lmsgate-2.uk.ibm.com (1.0.0) with ESMTP id JAA110330 for ; Wed, 7 Mar 2001 09:24:54 GMT Received: from usa.net (ss2.pok.socks.ibm.com [9.14.3.67]) by d06relay02.portsmouth.uk.ibm.com (8.8.8m3/NCO v4.95) with ESMTP id JAA160690 for ; Wed, 7 Mar 2001 09:39:43 GMT X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3AA601E8.5D3A6939@usa.net> Date: Wed, 07 Mar 2001 10:39:52 +0100 From: "Alberto di Bene" Organization: Undisclosed X-Mailer: Mozilla 4.76 [en] (Win95; U) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: LF: RE: Transcontinental modes - what next? References: <14313.200103061746@gemini> <01d501c0a69b$569c4f00$5bb51bca@xtr743187> 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: Hi all, which would you all prefer as a way to frequency-shift your TX ? With frequency shift I mean many steps, separated by a fraction of an Hertz. The first two possibilities that come to my mind are an audio output from the sound card (requiring then a mixer to bring the tone to the wanted freq.), or a binary value output from, say, the parallel port, which then would require a small external board with a DDS or a microcontroller to drive the TX. No linearity requirements will be needed. I need your input to not start in a false direction. TNX for any advices. 73 Alberto I2PHD