Return-Path: Received: (qmail 7989 invoked from network); 27 Mar 2001 13:43:32 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by 10.226.25.101 with SMTP; 27 Mar 2001 13:43:32 -0000 Received: (qmail 20881 invoked from network); 27 Mar 2001 13:43:31 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 27 Mar 2001 13:43:31 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14htfG-0002Fe-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 27 Mar 2001 14:37:38 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from hestia.herts.ac.uk ([147.197.200.9]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14htfF-0002FY-00 for rsgb_lf_group@blacksheep.org; Tue, 27 Mar 2001 14:37:38 +0100 Received: from [147.197.200.44] (helo=gemini) by hestia.herts.ac.uk with esmtp (Exim 3.16 #4) id 14hter-0000MI-00 for rsgb_lf_group@blacksheep.org; Tue, 27 Mar 2001 14:37:13 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <21660.200103271337@gemini> From: "James Moritz" Organization: University of Hertfordshire To: rsgb_lf_group@blacksheep.org Date: Tue, 27 Mar 2001 14:42:09 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit Subject: LF: Re: A Question X-Mailer: Pegasus Mail for Win32 (v3.11) Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Dear Alberto, LF group, Adding an amplitude measurement capability to Argo/Spectran sounds like an excellent idea - it would enable a meaningful measurement of relative signal strengths to be made. DL4YHF's Spectrum Lab has such a facility - I don't know how Wolf has implemented this, but the amplitude scale seems to be fixed relative to the input full scale or minumum resolution. I think this is as good a method as any - there are many different ways one might want to specify the amplitude or SNR. I don't understand why the measured level will vary with the total input - surely provided the A/D converter is not overloaded, the signal component being displayed should only be proportional to the amplitude of that component of the input signal? Cheers, Jim Moritz 73 de M0BMU