Return-Path: Received: (qmail 18340 invoked from network); 13 Jul 2001 08:44:08 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 13 Jul 2001 08:44:08 -0000 Received: (qmail 7720 invoked from network); 13 Jul 2001 08:42:49 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 13 Jul 2001 08:42:49 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15KyOr-0008MY-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 13 Jul 2001 09:34:13 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from e24.nc.us.ibm.com ([32.97.136.230]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15KyOq-0008MT-00 for rsgb_lf_group@blacksheep.org; Fri, 13 Jul 2001 09:34:12 +0100 Received: from southrelay01.raleigh.ibm.com (southrelay01.raleigh.ibm.com [9.37.3.208]) by e24.nc.us.ibm.com (8.9.3/8.9.3) with ESMTP id EAA56594 for ; Fri, 13 Jul 2001 04:33:09 -0500 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from usa.net (dyn9-87-107-177.italy.ibm.com [9.87.107.177]) by southrelay01.raleigh.ibm.com (8.11.1m3/NCO v4.96) with ESMTP id f6D8XOf124726 for ; Fri, 13 Jul 2001 04:33:26 -0400 Message-ID: <3B4EB230.6CD8914C@usa.net> Date: Fri, 13 Jul 2001 10:32:48 +0200 From: "Alberto di Bene" X-Mailer: Mozilla 4.76 [en] (Win95; U) X-Accept-Language: en MIME-Version: 1.0 To: "LF Mailing List" Subject: LF: [Fwd: VLF/LF Software Radio Transmitter] 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: I received the attached message, which looks very interesting, especially to those performing tests on VLF, around 9kHz. But reading the referenced page, 136kHz are not ruled out... 73 Alberto I2PHD -------- Original Message -------- Subject: VLF/LF Software Radio Transmitter Date: Thu, 12 Jul 2001 14:27:27 -0400 From: Maitland Bottoms To: The Tacos Mailing List OK, Since there have been discussions on both LF and Software Defined Radios in the group, I pass along the following news... Read up on it here: http://www.linuxdevices.com/articles/AT3239582376.html The gist is that you can download a floppy disk image and within a few minutes generate VLF/LF signals. 1. Read web page 2. Click on link to download floppy image data 3. Copy floppy image to a real physical floppy 4. Boot computer with said floppy 5. Attach parallel port antenna 6. Tune receiver to listen to transmissions Your mission, should you choose to accept it, would be to change the code a little to allow the operator to input a callsign and then pick OOK or FSK modulation options, and speed of morse code output. Extra credit, emergency power bonus points: Run this transmitter from a hand-cranked power source, using a manual powered computer described here: http://www.linuxdevices.com/articles/AT5746261759.html -Maitland _______________________________________________ Tacos mailing list Tacos@amrad.org http://www.amrad.org/mailman/listinfo/tacos