Return-Path: Received: (qmail 14372 invoked from network); 24 Apr 2001 15:52:40 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by 10.226.25.101 with SMTP; 24 Apr 2001 15:52:40 -0000 Received: (qmail 26764 invoked from network); 24 Apr 2001 15:42:15 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 24 Apr 2001 15:42:15 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14s4lX-0007rf-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 24 Apr 2001 16:30:11 +0100 X-Priority: 3 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14s4lS-0007ra-00 for rsgb_lf_group@blacksheep.org; Tue, 24 Apr 2001 16:30:07 +0100 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id QAA06924; Tue, 24 Apr 2001 16:33:13 +0100 (BST) Received: (qmail 4240 invoked from network); 24 Apr 2001 16:24:00 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 24 Apr 2001 16:24:00 -0000 Received: by gauntlet.mail.dera.gov.uk; id QAA08412; Tue, 24 Apr 2001 16:20:42 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma008203; Tue, 24 Apr 01 16:19:57 GMT Received: from FRN-MAIL-3.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Tue, 24 Apr 2001 16:35:52 +0100 Received: by frn-mail-3.dera.gov.uk with Internet Mail Service (5.5.2650.21) id ; Tue, 24 Apr 2001 16:28:47 +0100 Message-ID: <65AECDF1F89AD411900400508BFC869F9C0457@pdw-mail-1.dera.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: LF: WOLF test results, soundcard trouble Date: Tue, 24 Apr 2001 16:28:56 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: An alternative to the SD interface is my PIC based one, which is directly compatible and uses just two ICs one of them an op-amp. Andy G4JNT > > Rik's idea of bypassing the card is another good solution. > One alternative that already exists is the VE2IQ interface. See > http://cafe.rapidus.net/bill1/bbs.htm and download SDPCX.ZIP . > This is a home brew Sigma-Delta A/D which drives a serial port. > Many PSK and CCW programs can use it, and it has also been > used with WOLF. > You can buy kits from Bill for US$54, or build your own from scratch. > Sample rate is a precise 7200 Hz. Resolution is only 8 bits, > but IMO that is plenty, unless the audio signal is dominated > by a strong interfering carrier. If most of the audio power is > random noise and/or static crashes, then even 1 bit is pretty good! > Steve VK2ZTO has shown impressive results sampling this way. > > -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.