Return-Path: Received: from mtain-db06.r1000.mx.aol.com (mtain-db06.r1000.mx.aol.com [172.29.64.90]) by air-dc03.mail.aol.com (v128.3) with ESMTP id MAILINDC033-864f4bd700a327d; Tue, 27 Apr 2010 11:20:03 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-db06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7783F3806DAF1; Tue, 27 Apr 2010 10:24:32 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O6lWL-0005x5-2V for rs_out_1@blacksheep.org; Tue, 27 Apr 2010 15:12:17 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O6lWK-0005ww-Bo for rsgb_lf_group@blacksheep.org; Tue, 27 Apr 2010 15:12:16 +0100 Received: from smtp-out04.alice.it ([85.37.17.100]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O6lWI-0000hI-K8 for rsgb_lf_group@blacksheep.org; Tue, 27 Apr 2010 15:12:16 +0100 Received: from FBCMMO01.fbc.local ([192.168.68.195]) by smtp-out04.alice.it with Microsoft SMTPSVC(6.0.3790.3959); Tue, 27 Apr 2010 16:02:55 +0200 Received: from FBCMCL01B06.fbc.local ([192.168.69.87]) by FBCMMO01.fbc.local with Microsoft SMTPSVC(6.0.3790.3959); Tue, 27 Apr 2010 16:02:53 +0200 Received: from PCCasa ([82.59.165.194]) by FBCMCL01B06.fbc.local with Microsoft SMTPSVC(6.0.3790.3959); Tue, 27 Apr 2010 16:02:52 +0200 Message-ID: <933C274D780649AFA1D0DDCEE5D82AD4@PCCasa> From: "Daniele Tincani" To: References: <4EB4F8217FCC42CAB07AE666A6AB07B8@AGB> <4BD5F358.8040508@freenet.de> <4BD6147C.7080201@usa.net> <4BD62289.6040703@usa.net> <2B460BBAF166453C9B99F67A38457609@PCCasa> <4BD6E2EF.9060300@usa.net> In-Reply-To: <4BD6E2EF.9060300@usa.net> Date: Tue, 27 Apr 2010 16:02:42 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18005 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18005 X-OriginalArrivalTime: 27 Apr 2010 14:02:53.0132 (UTC) FILETIME=[544888C0:01CAE612] X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Probably not a new question... Content-Type: multipart/alternative; boundary="----=_NextPart_000_001D_01CAE623.11564230" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_20_30,HTML_MESSAGE, HTML_TITLE_EMPTY,MISSING_OUTLOOK_NAME 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: 3039ac1d405a4bd6f3a00e97 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_001D_01CAE623.11564230 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable OK, now I see the concept much clearer than I knew before (with my apo= logies for having stressed the subject a bit :-)). All this stuff is very interesting and promising, with very high perfo= mance/cost ratio and great scalability. I think I will be seriously ev= aluating to homebrew a good SDR project in the coming months (the only= choice I can afford from a financial point of view :-)) Cheers D. ----- Original Message -----=20 From: Alberto di Bene=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, April 27, 2010 3:13 PM Subject: Re: LF: Probably not a new question... On 4/27/2010 2:25 AM, Daniele Tincani wrote:=20 Hi Alberto, I'm quite familiar with digital signal processing (I work in the= embedded SW area for a big manufacturer of telecommunications equipme= nts 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 AD= C :-) 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 ju= st 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 diffusio= n 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....=20 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 me= aningless 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 go= al is almost reached with the QuickSilver and the Perseus SDR.... 73 Alberto I2PHD ----------------------------------------------------------------------= -------- Nessun virus nel messaggio in arrivo. Controllato da AVG - www.avg.com=20 Versione: 9.0.814 / Database dei virus: 271.1.1/2837 - Data di rila= scio: 04/26/10 20:27:00 ------=_NextPart_000_001D_01CAE623.11564230 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
OK, now I see the con= cept much=20 clearer than I knew before (with my apologies for having stressed the= subject a=20 bit :-)).
All this stuff is ver= y interesting=20 and promising, with very high perfomance/cost ratio and great scalabil= ity. I=20 think I will be seriously evaluating to homebrew a good SDR project in= the=20 coming months (the only choice I can afford from a financial point of= view=20 :-))
Cheers
D.
----- Original Message -----
From:=20 Alberto di= Bene=20
Sent: Tuesday, April 27, 2010= 3:13=20 PM
Subject: Re: LF: Probably not= a new=20 question...

On 4/27/2010 2:25 AM, Daniele Tincani wrote:=20
Hi Alberto,
 
I'm quite fami= liar with=20 digital signal processing (I work in the embedded SW=20 area for a big manufacturer of telecommunicati= ons=20 equipments and digital streams of several Gbit/s are common on our= boards),=20 nevertheless I know that analog conditioning of signals (before th= ey become=20 "numbers") is at least as important as the digital treatment, unle= ss you=20 accept to sample meaningless information (noise) at the ADC :-) An= yway I'm=20 sure this is dealt with perfectly in SDR's so I think we can stop= here this=20 discussion.
Thank you for= =20 clarifications.
Cheers<= /I>
D,<= /I>
Hi=20 Daniele,

   I wasn't specifically addressing you in= my past=20 message, I was just trying to explain what is behind some diffidence= that=20 often it is possible to hear or to read
about the SDR technology.=   And=20 the Softrocks are a mixed blessing... from one side they helped a lo= t with=20 their very low cost the diffusion of the SDR concepts
among the= ham=20 community. But on the opposite side, their lackluster performance ge= nerated in=20 some the impression that SDR is a technology still much behind
it= s=20 classical analog counterpart, which isn't....

You are perfec= tly right=20 when saying that the analog portion in front of the digitizer is of= utmost=20 importance, to not have to deal with meaningless numbers.
That's= why the=20 tendency is to bring the digitization stage as close as possible to= the=20 antenna... and, at least for the HF bands, this goal is almost reach= ed=20 with
the QuickSilver and the Perseus SDR....

73  Albe= rto =20 I2PHD


Nessun virus nel messaggio in arrivo.
Controllato da= AVG -=20 www.avg.com
Versione: 9.0.814 / Database dei virus: 271.1.1/2837= - =20 Data di rilascio: 04/26/10 20:27:00
------=_NextPart_000_001D_01CAE623.11564230--