Return-Path: Received: (qmail 17876 invoked from network); 10 May 2000 11:19:53 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by bells.core.plus.net.uk with SMTP; 10 May 2000 11:19:53 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12pUKf-0000p7-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 10 May 2000 12:07:13 +0100 Content-Transfer-Encoding: 8bit Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12pUKd-0000p2-00 for rsgb_lf_group@blacksheep.org; Wed, 10 May 2000 12:07:11 +0100 Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id MAA27860; Wed, 10 May 2000 12:10:17 +0100 (BST) X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 9366 invoked from network); 10 May 2000 12:03:01 -0000 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 10 May 2000 12:03:01 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: by gauntlet.mail.dera.gov.uk; id KAA06612; Wed, 10 May 2000 10:51:24 GMT Received: from unknown(146.80.11.40) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma006571; Wed, 10 May 00 10:51:14 GMT Received: from frn-gold-1.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Wed, 10 May 2000 12:11:32 +0100 Received: by FRN-GOLD-1 with Internet Mail Service (5.0.1460.8) id <2J00BJP6>; Wed, 10 May 2000 12:05:44 +0100 Message-ID: <3617AC3245C2D1118A840000F805359C017528CA@pdw-mercury-1.dera.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: LF: DDS Source board (was DFCW parameters) Date: Wed, 10 May 2000 12:05:41 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.0.1460.8) 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: I do not intend to include anything in the DDS PIC firmware other than an ability to translate ASCII commnads into control words, and optionally store the settings to EEPROM for instant return to the same CW frequency. This approach will make for a general purpose standalone DDS generator module. Any frequency modulation - or phase change - will be made in real time by a PC sending serial commands to the DDS. While it would have been possible to dispense with the PIC altogether and drive the AD9850 directly, it is more robust, and certainly easier to write high level software, if a standard serial RS232 type protocol is used. WINDOZE programming makes it more difficult to address PC I/O ports directly than was DOS. Dave 'MRF, when you say linear BPSK what do you mean ? There is no option to shape the waveform surely with only 0 / 180 and no signal states. Andy G4JNT > ---------- > From: G0MRF@aol.com[SMTP:G0MRF@aol.com] > Reply To: rsgb_lf_group@blacksheep.org > Sent: 2000-05-09 14:32 > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: DFCW Parameters > > Thanks to the reflector and a lot of hard work by Johan SM6LKM - DFCW > has > now been included in the PIC16F84 firmware used in the 9832 DDS. + or > - > Offset can be changed. > Linear BPSK has also been included in hardware. Unfortunately, no > computer > transmit / receive programs have been found yet which can take > advantage of > the new BPSK feature. ( 0V = one phase, 12V = -180 degrees 6V = no > output) > But I'm still looking. Any ideas anyone? > -- 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.