Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 09A2838000087; Sun, 12 Feb 2012 05:16:49 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RwWTb-0003Es-Mw for rs_out_1@blacksheep.org; Sun, 12 Feb 2012 10:16:11 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RwWTb-0003Ei-8L for rsgb_lf_group@blacksheep.org; Sun, 12 Feb 2012 10:16:11 +0000 Received: from out1.ip06ir2.opaltelecom.net ([62.24.128.242]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RwWTZ-0005Dp-RM for rsgb_lf_group@blacksheep.org; Sun, 12 Feb 2012 10:16:11 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApMBADORN09Olm+i/2dsb2JhbAAMOK0/hTMBAQEBAzhAEQsJDwkWDwkDAgECATcBDRMIAQG6KItOMAgEAQUEAwQEBw4GAQMIAQQfA4Nke4MdBI1lmjE X-IronPort-AV: E=Sophos;i="4.73,407,1325462400"; d="scan'208";a="527328100" Received: from host-78-150-111-162.as13285.net (HELO [192.168.2.5]) ([78.150.111.162]) by out1.ip06ir2.opaltelecom.net with ESMTP; 12 Feb 2012 10:15:59 +0000 Message-ID: <4F37915E.8010706@talktalk.net> Date: Sun, 12 Feb 2012 10:15:58 +0000 From: qrss User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:10.0) Gecko/20120129 Thunderbird/10.0 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4F341AE5.1050704@talktalk.net> <4F342525.1050200@talktalk.net> <4F34313C.1080005@talktalk.net> <1659D80990BC4B5482FF78B6249AACAF@JimPC> <4F34D86D.1010405@talktalk.net> <4F37899F.9060708@xs4all.nl> In-Reply-To: <4F37899F.9060708@xs4all.nl> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Cats among pigeons Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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=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: 0:2:486053216:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60564f379191422a X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none 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 > real 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 decode @ -24dB Av > Op2 decode @ -27dB Av > Op4 decode @ -30dB Av > Op8 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 > > > >