Envelope-to: dave@picks.force9.co.uk Delivery-date: Sun, 24 Apr 2005 21:01:58 +0100 Received: from pih-spamcore04.plus.net ([192.168.71.8]) by pih-mxcore10.plus.net with esmtp (PlusNet MXCore v1.0) id 1DPnIk-0003sQ-Ik for dave@picks.force9.co.uk; Sun, 24 Apr 2005 21:01:58 +0100 Received: from Debian-exim by pih-spamcore04.plus.net with spam-scanned (Exim 4.50) id 1DPnIe-0000Ct-S6 for dave@picks.force9.co.uk; Sun, 24 Apr 2005 21:01:56 +0100 Received: from [192.168.101.74] (helo=pih-mxcore08.plus.net) by pih-spamcore04.plus.net with esmtp (Exim 4.50) id 1DPnIe-0000Cq-Qr for dave@picks.force9.co.uk; Sun, 24 Apr 2005 21:01:52 +0100 Received: from post.thorcom.com ([193.82.116.20]) by pih-mxcore08.plus.net with esmtp (PlusNet MXCore v1.0) id 1DPnIe-0004NN-Jq for dave@picks.force9.co.uk; Sun, 24 Apr 2005 21:01:52 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DPnIW-0005uL-7w for rs_out_1@blacksheep.org; Sun, 24 Apr 2005 21:01:44 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DPnIV-0005uC-So for rsgb_lf_group@blacksheep.org; Sun, 24 Apr 2005 21:01:43 +0100 Received: from imo-d04.mx.aol.com ([205.188.157.36]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DPnIU-0008Ea-FC for rsgb_lf_group@blacksheep.org; Sun, 24 Apr 2005 21:01:43 +0100 Received: from MarkusVester@aol.com by imo-d04.mx.aol.com (mail_out_v38.7.) id l.60.5441c725 (18555) for ; Sun, 24 Apr 2005 16:01:34 -0400 (EDT) From: MarkusVester@aol.com Message-ID: <60.5441c725.2f9d551d@aol.com> Date: Sun, 24 Apr 2005 16:01:33 EDT To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 8.0 for Windows sub 6104 X-SPF-Result: relay.thorcom.net: domain of aol.com designates 205.188.157.36 as permitted sender Subject: LF: Re: Divider by 10 or 100 for 136k out Content-Type: text/html; charset=windows-1252 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v4.00s) Content-transfer-encoding: 8bit Dear Hans-Albrecht and Jim,

there is one minor disadvantage in keying a divider: As the phase at each key-down is arbitrary, the transmitted signal looses its inter-symbol coherence. This does not affect normal aural or visual decoding in any manner. But on a high-resolution FFT you will no longer be able to resolve a central spectral line, which would be useful to detect the presence of a very weak signal or precisely measure its frequency.

Of course the same holds true for small keying chirps, as I have recently learned :-(

73 de Markus, DF6NM