Return-Path: Received: from mtain-ma05.r1000.mx.aol.com (mtain-ma05.r1000.mx.aol.com [172.29.96.13]) by air-de03.mail.aol.com (v128.3) with ESMTP id MAILINDE033-5eac4bd6e57db9; Tue, 27 Apr 2010 09:24:13 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7287C3800009C; Tue, 27 Apr 2010 09:24:11 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O6kki-0003yc-Gb for rs_out_1@blacksheep.org; Tue, 27 Apr 2010 14:23:04 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O6kki-0003yT-0Z for rsgb_lf_group@blacksheep.org; Tue, 27 Apr 2010 14:23:04 +0100 Received: from cmsout01.mbox.net ([165.212.64.31]) by relay2.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O6kkf-0007gu-EI for rsgb_lf_group@blacksheep.org; Tue, 27 Apr 2010 14:23:03 +0100 Received: from cmsout01.mbox.net (cmsout01-lo [127.0.0.1]) by cmsout01.mbox.net (Postfix) with ESMTP id D42EE2AC9C6 for ; Tue, 27 Apr 2010 13:13:25 +0000 (GMT) Received: from cmsapps03.cms.usa.net [165.212.11.132] by cmsout01.mbox.net via smtad (C8.MAIN.3.61T) with ESMTP id XID710oDANNZ4426X01; Tue, 27 Apr 2010 13:13:25 -0000 X-USANET-Source: 165.212.11.132 IN dibene@usa.net cmsapps03.cms.usa.net X-USANET-MsgId: XID710oDANNZ4426X01 Received: from [192.168.1.4] [151.47.216.58] by cmsapps03.cms.usa.net (ESMTPA/dibene@usa.net) via mtad (C8.MAIN.3.53P) with ESMTPA id 144oDANNy1920M39; Tue, 27 Apr 2010 13:13:24 -0000 X-USANET-Auth: 151.47.216.58 AUTH dibene@usa.net [192.168.1.4] Message-ID: <4BD6E2EF.9060300@usa.net> Date: Tue, 27 Apr 2010 15:13:19 +0200 From: Alberto di Bene User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.9) Gecko/20100317 Thunderbird/3.0.4 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4EB4F8217FCC42CAB07AE666A6AB07B8@AGB> <4BD5F358.8040508@freenet.de> <4BD6147C.7080201@usa.net> <4BD62289.6040703@usa.net> <2B460BBAF166453C9B99F67A38457609@PCCasa> In-Reply-To: <2B460BBAF166453C9B99F67A38457609@PCCasa> X-Enigmail-Version: 1.0.1 Z-USANET-MsgId: XID144oDANNy1920X39 X-Spam-Score: 0.8 (/) X-Spam-Report: autolearn=disabled,AWL=-0.594,HTML_MESSAGE=0.001,MIME_HTML_ONLY=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Probably not a new question... Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_30_40,HTML_MESSAGE, HTML_TITLE_EMPTY,MIME_HTML_ONLY autolearn=no version=2.63 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-aol-global-disposition: G x-aol-sid: 3039ac1d600d4bd6e57b08e1 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) On 4/27/2010 2:25 AM, Daniele Tincani wrote:

Hi Alberto,

I'm quite familiar with digital signal processing (I work in the embedded SW area for a big manufacturer of telecommunications equipments and digital streams of several Gbit/s are common on our boards), nevertheless I know that analog conditioning of signals (before they become "numbers") is at least as important as the digital treatment, unless you accept to sample meaningless information (noise) at the ADC :-) Anyway I'm sure this is dealt with perfectly in SDR's so I think we can stop here this discussion.

Thank you for clarifications.

Cheers

D,

Hi Daniele,

I wasn't specifically addressing you in my past message, I was just trying to explain what is behind some diffidence that often it is possible to hear or to read
about the SDR technology. And the Softrocks are a mixed blessing... from one side they helped a lot with their very low cost the diffusion of the SDR concepts
among the ham community. But on the opposite side, their lackluster performance generated in some the impression that SDR is a technology still much behind
its classical analog counterpart, which isn't....

You are perfectly right when saying that the analog portion in front of the digitizer is of utmost importance, to not have to deal with meaningless numbers.
That's why the tendency is to bring the digitization stage as close as possible to the antenna... and, at least for the HF bands, this goal is almost reached with
the QuickSilver and the Perseus SDR....

73 Alberto I2PHD