Return-Path: Received: (qmail 7976 invoked from network); 10 May 2000 17:30:45 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by bells.core.plus.net.uk with SMTP; 10 May 2000 17:30:45 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12pZdi-0003gy-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 10 May 2000 17:47:14 +0100 Received: from d06lmsgate-3.uk.ibm.com ([195.212.29.3] helo=lmsfw2.emea.ibm.com) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12pZdd-0003gr-00 for rsgb_lf_group@blacksheep.org; Wed, 10 May 2000 17:47:10 +0100 Received: from d06relay01.portsmouth.uk.ibm.com (d06relay01.portsmouth.uk.ibm.com [9.166.84.147]) by lmsfw2.emea.ibm.com (1.0.0) with ESMTP id RAA91848 for ; Wed, 10 May 2000 17:38:31 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from usa.net (lig32-239-133-77.emea.lig-dial.ibm.com [32.239.133.77]) by d06relay01.portsmouth.uk.ibm.com (8.8.8m3/NCO v2.07) with ESMTP id RAA91426 for ; Wed, 10 May 2000 17:46:08 +0100 Message-ID: <3919921A.F280DCA2@usa.net> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Date: Wed, 10 May 2000 18:45:14 +0200 From: "Alberto di Bene" Organization: Undisclosed X-Mailer: Mozilla 4.72 [en] (Win95; U) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: RE: 1Hz Bandwidths References: <12939.200005101555@gemini> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: James Moritz wrote: > Dear Andy & Group, > With a 1Hz Bandwidth, isn't it rather difficult to find the signals > in the first place? How do you tell if what you are receiving is a > signal or not? It seems to me that some radically different > operating procedures will have to be devised to exploit extreme > narrow band techniques such as these! > The final version of Spectran will have audio filtering, as in Hamview. With this, you can apply a very narrow filter to incoming audio by just pointing with the mouse to the desired trace on the waterfall. Hamview has a choice of both FIR and IIR filters, and probably also Spectran will. Alberto, I2PHD