Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 44A9C38000082; Sun, 12 Feb 2012 05:23:55 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RwWaO-0003SQ-Hz for rs_out_1@blacksheep.org; Sun, 12 Feb 2012 10:23:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RwWaO-0003SH-4x for rsgb_lf_group@blacksheep.org; Sun, 12 Feb 2012 10:23:12 +0000 Received: from mail-iy0-f171.google.com ([209.85.210.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RwWaM-0005KG-KT for rsgb_lf_group@blacksheep.org; Sun, 12 Feb 2012 10:23:12 +0000 Received: by iaeh11 with SMTP id h11so4196815iae.16 for ; Sun, 12 Feb 2012 02:23:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=Dddvr/7GMe9kzzlCLtsIZuYK5BQ95SeBvb3dnSJkOJk=; b=baPGtl1SopO1RqKWcBB1ss/VVZ1Fqkp5AZyVDxX8P8L6SHdqxlcyU0VHaVI9CLyld2 DpF9+r6uTaY2fxLMXCs3GfCjtRgAIvNA9vccY5i76ZHGV8ZUt6QQeXyXckvc+YzsSgm2 lAieOzt+Qck/X5PT6U2+oKB9SixDLCjO2Cno0= MIME-Version: 1.0 Received: by 10.50.196.228 with SMTP id ip4mr20611065igc.28.1329042184473; Sun, 12 Feb 2012 02:23:04 -0800 (PST) Received: by 10.231.158.68 with HTTP; Sun, 12 Feb 2012 02:23:04 -0800 (PST) In-Reply-To: <4F37915E.8010706@talktalk.net> References: <4F341AE5.1050704@talktalk.net> <4F342525.1050200@talktalk.net> <4F34313C.1080005@talktalk.net> <1659D80990BC4B5482FF78B6249AACAF@JimPC> <4F34D86D.1010405@talktalk.net> <4F37899F.9060708@xs4all.nl> <4F37915E.8010706@talktalk.net> Date: Sun, 12 Feb 2012 10:23:04 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Cats among pigeons Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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-SCOLL-SCORE: 0:2:485364192:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d303.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d410b4f37933b1aa5 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none In all cases, the mean power is 4dB above the noise level in a bandwidth corresponding to 1/symbol interval Andy G4JNT On 12 February 2012 10:15, qrss wrote: > Thanks for posting the info Albert, that is what was needed. > > I assume Av is the average of the minimum signal levels obtained from the > large number of test. > > 73 Eddie G3ZJO > > > On 12/02/2012 09:42, Albert wrote: >> >> Hello all Opera lovers, >> >> Testing Opera speed op1 till op32 under "lab" conditions without the rea= l >> world phenomena like fading and QRN. >> The results: >> 1. if you have solid Opera decodes the received SNR stays the same when >> switching between opera speeds; >> 2. the only change is the minimum level where decodes are still possible= . >> After a large number of test transmissions I gathered the following >> results. >> >> Op1 =A0 decode @ -24dB Av >> Op2 =A0 decode @ -27dB Av >> Op4 =A0 decode @ -30dB Av >> Op8 =A0 decode @ -33dB Av >> Op32 decode @ -37dB Av >> >> Test set up: TX Flex 1500, 0.2 mw output, attenuators Bird and HP > 120 >> dB, min. step 1 dB, RX Flex 5000, Software Opera v.1.2.8 Windows 7 64. >> >> 73, Albert PA0A >> >> >> >> > >