Return-Path: Received: (qmail 12383 invoked from network); 24 Jan 2000 11:33:49 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by teachers.core.plus.net.uk with SMTP; 24 Jan 2000 11:33:49 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12ChdA-0004Jp-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 24 Jan 2000 11:26:00 +0000 Received: from mail2.hamilton-standard.com ([153.4.57.12]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12Chd8-0004Jf-00 for rsgb_lf_group@blacksheep.org; Mon, 24 Jan 2000 11:25:59 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from curly.hsd.utc.com by mail2.hamilton-standard.com; (8.9.1/) id GAA15475; Mon, 24 Jan 2000 06:35:05 -0500 (EST) Received: from umrsvr.hsd.utc.com by curly.hsd.utc.com; (8.9.0/) id GAA25399; Mon, 24 Jan 2000 06:24:45 -0500 (EST) Received: from nmex01nt.hsd.utc.com by umrsvr.hsd.utc.com; (8.9.0/) id GAA32670; Mon, 24 Jan 2000 06:21:48 -0500 (EST) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: by nmex01nt.hsd.utc.com with Internet Mail Service (5.5.2650.21) id ; Mon, 24 Jan 2000 12:18:12 +0100 Message-ID: From: "Soegiono, Gamal" To: rsgb_lf_group@blacksheep.org Subject: LF: update on 'reeiving on 137 kHz' Date: Mon, 24 Jan 2000 12:18:11 +0100 X-Mailer: Internet Mail Service (5.5.2650.21) Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-type: text/plain; charset=windows-1252; format=flowed MIME-Version: 1.0 Content-transfer-encoding: 8bit Dear LF friends, few details to add to my last message: ADC is actually a 18 bit resolution (Burr-Brown) DSP uses 16 bit for calculation DSP-1 determines the final IF BW and demodulates DSP-2 does noise-reduction and notch filtering To Dave Brown: The receiver has one discrete attenuator of 40 dB which is switched into the signal path as soon as the input level reaches or exceeds +10dBm (10mW into 50 Ohms), and while the receiver is switched OFF. The mentioned -102dBm level was measured with 50 Hz bandwidth. Best 73 de Gamal Soegiono soegiono@nm.hsd.utc.com or soegiono@nmex01nt.hsd.utc.com