Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=BAYES_00,RCVD_ILLEGAL_IP autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t041BWjS004392 for ; Sun, 4 Jan 2015 02:11:32 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y7ZdS-0006kD-25 for rs_out_1@blacksheep.org; Sun, 04 Jan 2015 01:05:38 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y7ZdR-0006k4-KS for rsgb_lf_group@blacksheep.org; Sun, 04 Jan 2015 01:05:37 +0000 Received: from smtpout1.wanadoo.co.uk ([80.12.242.29] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1Y7ZdQ-0002lQ-0M for rsgb_lf_group@blacksheep.org; Sun, 04 Jan 2015 01:05:36 +0000 Received: from AGB ([2.31.67.36]) by mwinf5d13 with ME id bd5b1p0010mwa3m03d5b8s; Sun, 04 Jan 2015 02:05:35 +0100 X-ME-Helo: AGB X-ME-Date: Sun, 04 Jan 2015 02:05:35 +0100 X-ME-IP: 2.31.67.36 Message-ID: <8DFA129D55654B8399986D591F0DCEE5@AGB> From: "Graham" To: References: In-Reply-To: Date: Sun, 4 Jan 2015 01:05:35 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Scan-Signature: 7ab87d4d3ea1d9dcb73a78e83fe4d608 Subject: Re: LF: OPERA explanation? Content-Type: text/plain; format=flowed; charset="UTF-8"; reply-type=original Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1777 There is a description of the data encoding in the yahoo group , along with the last working version one-4-one , 15 chrs plain text 120 second tx time version , alas only -20 dB s/n originally developed as a plug in replacement for the CW key , later the beacon function found extended use across most bands in use , Other than that , its a serial data mode , using Manchester coding , transmission is by on/off keying of a single carrier , FEC and AFC provide additional sensitivity and negates the need for high stability tx/rx , originally 50% of the signal needed to be recovered for decode , this is now app 40% , ie 60% random loss can occur. Its packaged as a stand alone windows application , that provides tx/rx and web linkage to other users and the psk-map the tx cycle time is used to increase the sensitivity , changes to the DSP are provided , linked to band, to accommodate changes of requirements , the longer op8/16/32 1H 2H [4H audio sound card sdr] being suited to low frequency , where as the Op4/2/1 best fit HF , the more experimental Op05 [ 30 second -20 dB] finding good use , 145 MHZ up to 10 GHz The 'Crazy Gang' in EA , regularly see 500 + K 2/ 70cm / 23 cm ,some times 1500 K on 2 meters EB6AOK EA9MH 2m OPERA 575 km 19:01:00 EA9MH EB6AOK 2m OPERA 575 km 20:28:55 EA3KZ EA5CV 2m OPERA 419 km 10:04:01 EA5HNM EA3KZ 2m OPERA 415 km 19:59:01 EA3KZ EA5HNM 2m OPERA 415 km 15:05:16 EA3KZ EA5CV/P 2m OPERA 407 km 20:12:53 EA9MH EA5CV 2m OPERA 405 km 07:49:16 https://www.facebook.com/groups/operadatamode/ https://groups.yahoo.com/neo/groups/O_P_E_R_A_/info 73-Graham G0NBD -------------------------------------------------- From: Sent: Saturday, January 03, 2015 11:37 PM To: Subject: LF: OPERA explanation? > OPERA digimode: > Where can I find a good explanation. > > Search engine = OPERA G4WGT > didn't help. > > > 73 Dennis > DL6NVC >