Return-Path: Received: (qmail 15650 invoked from network); 12 Feb 2001 02:22:58 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by 10.226.25.101 with SMTP; 12 Feb 2001 02:22:58 -0000 Received: (qmail 3930 invoked from network); 12 Feb 2001 02:22:57 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 12 Feb 2001 02:22:57 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14S8Xc-0000or-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 12 Feb 2001 02:16:36 +0000 Received: from imo-r02.mx.aol.com ([152.163.225.2]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14S8Xb-0000om-00 for rsgb_lf_group@blacksheep.org; Mon, 12 Feb 2001 02:16:35 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from MarkusVester@aol.com by imo-r02.mx.aol.com (mail_out_v29.5.) id l.6d.f52425f (16336) for ; Sun, 11 Feb 2001 21:15:39 -0500 (EST) From: MarkusVester@aol.com Message-ID: <6d.f52425f.27b8a148@aol.com> Date: Sun, 11 Feb 2001 21:15:36 EST Subject: LF: Phase-coherent CW and DFCW To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Mailer: AOL 4.0.i for Windows 95 sub 70 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi group, Apropos DBF39 non-phase-coherence: Reminds me of an issue which has been brought up here about the possibility of very narrowband-detection of the carrier-component of (higher data rate) CW and DFCW. - To preserve the phase during normal-CW key up, you simply have to leave your (stable) oscillator running, including frequency dividers (!). Multipliers and the m-dividers of a m/n-PLL can be blanked though. - For DFCW with a single oscillator, the phase difference accumulated during each frequency-switching period has to be an integer multiple of 360°. This can be achieved by choosing the symbol length (eg. 4 s) and the frequency shift (eg. 4 Hz) such that their product becomes an integer number (16). 73s de Markus, DF6NM