Return-Path: Received: (qmail 7763 invoked from network); 25 Jan 2000 00:08:04 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by bells.core.plus.net.uk with SMTP; 25 Jan 2000 00:08:04 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12CtOp-0000kG-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 24 Jan 2000 23:59:59 +0000 Received: from tele-post-20.mail.demon.net ([194.217.242.20]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12CtOo-0000kB-00 for rsgb_lf_group@blacksheep.org; Mon, 24 Jan 2000 23:59:58 +0000 Received: from rgcomms.demon.co.uk ([193.237.77.63] helo=G) by tele-post-20.mail.demon.net with smtp (Exim 2.12 #2) id 12CtOk-000JuN-0K for rsgb_lf_group@blacksheep.org; Mon, 24 Jan 2000 23:59:54 +0000 From: "Graham Phillips" To: "Rsgb_Lf_Group" Subject: LF: Narrow Bandwidth reception Date: Mon, 24 Jan 2000 23:58:10 -0000 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi all LF'ers. I would like to know other users experiences using the Spectrogram programs. I have frequently found that I am only able to detect the weakest stations using a sample rate of 5.5k with a FFT size of 16384. This gives an on-screen bandwidth of 86 Hz. If I attempt to see more of the band, either by increasing the sample rate, or decreasing the FFT size, I am unable to detect the signal that I know is there. This seems fairly obvious, in that decreasing bandwidth should improve signal to noise, but I wonder if all users have the same results? 73 de Graham B. Phillips. G3XTZ.