Return-Path: X-Spam-DCC: paranoid 1102; 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=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL 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 t8N9VIRB021920 for ; Wed, 23 Sep 2015 11:31:18 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZegGb-0007XU-9O for rs_out_1@blacksheep.org; Wed, 23 Sep 2015 10:23:09 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZegGa-0007XL-SZ for rsgb_lf_group@blacksheep.org; Wed, 23 Sep 2015 10:23:08 +0100 Received: from smtpcmd04131.aruba.it ([62.149.158.131]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZegFW-0004lM-RH for rsgb_lf_group@blacksheep.org; Wed, 23 Sep 2015 10:23:07 +0100 Received: from [1.41.142.87] ([37.227.149.61]) by smtpcmd04.ad.aruba.it with bizsmtp id LZMl1r0041KjVD901ZMl4k; Wed, 23 Sep 2015 11:21:46 +0200 References: <5601EC9F.2010607@gmail.com> From: "IZ7PDX Luigi D." X-Mailer: iPhone Mail (12B440) In-Reply-To: <5601EC9F.2010607@gmail.com> Message-Id: <8DDE999B-0D5B-4E81-A35B-E5C0335659CB@iz7pdx.it> Date: Wed, 23 Sep 2015 11:21:43 +0200 To: "rsgb_lf_group@blacksheep.org" Mime-Version: 1.0 (1.0) X-Scan-Signature: 66d07794ca19cd68f7d6cc289cd4ac18 Subject: Re: LF: Coherent BPSK on LF using EbNaut Content-Type: text/plain; charset=us-ascii 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id t8N9VIRB021920 Status: O X-Status: X-Keywords: X-UID: 4122 Congratulations Domenico! 73 to all... Inviato da iPhone > Il giorno 23/set/2015, alle ore 02:04, IZ7SLZ ha scritto: > > Hello LF, > > I am pleased to report a successful "Coherent BPSK" QSO between DF6NM and IZ7SLZ on LF using EbNaut program of Paul Nicholson. > QSO took place in the night between Friday 2015-09-18 and Saturday 2015-09-19 . > > I think it was the first time that anyone tried this on 137 kHz ! > > Frequencies used were 137510.00 Hz (DF6NM) and 137502.12 (IZ7SLZ). > > We exchange messages of 16 characters in coherent BPSK with UT synchronous symbols, using a symbol period of 1 second and 8K19A scheme coding. > > Software used were the Windows' versions of EbNaut-TX and EbNaut-RX (tnx to P. Nicholson: your software is working without problems!). > Also Spectrum Lab (tnx Wolf !) was used to export FFT data, in a similar way of the Markus' OPDS setup. > Other programs, written by Markus, were used: one to convert FFT exported data for the EbNaut entry and another to search for the best frequency and time offsets. > > There was not much phase drift during the qso and in other test transmissions, since we reach a good frequency stability at both ends thanks to Rubidium Reference Oscillator (Markus side) and a good quality OCXO from my side. > > You can see reported symbol / carrier EbN0 and also the messages exchanged, in the attached screen-shots taken at both ends. > > We hope now to joint other stations that want to challenge the timing and frequency accuracy, to have a QSO in LF close to the Shannon limit. > > Markus DF6NM, will report soon all particulars and his comments of the experiment. Thanks in advance Markus! > > 73, Domenico (iz7slz) > > > >