Return-Path: X-Spam-DCC: paranoid 1290; Body=3 Fuz1=3 Fuz2=3 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 tB3K8lV0008463 for ; Thu, 3 Dec 2015 21:08:47 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a4a8P-000702-VV for rs_out_1@blacksheep.org; Thu, 03 Dec 2015 20:05:45 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a4a8O-0006zm-CN for rsgb_lf_group@blacksheep.org; Thu, 03 Dec 2015 20:05:44 +0000 Received: from mail-wm0-f43.google.com ([74.125.82.43]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1a4a7K-00058K-7g for rsgb_lf_group@blacksheep.org; Thu, 03 Dec 2015 20:05:43 +0000 Received: by wmvv187 with SMTP id v187so44472770wmv.1 for ; Thu, 03 Dec 2015 12:04:22 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=dSHemY/YKHgwXKn7ni5SLCIGpDWYkDEUQUB5Ej/2UwY=; b=fPda4YtYc0OAH6QeNI34tC4Pe3MS9XhJGc7mx83lW+L6GmoK7VXS9FRVeP3fjqhy6L IH/kN5HKRLbS1rKgDUiakkhWqC7H9R3//CdKgFXDhwY53LAsfY6iLvhWl1PwrVSEJSsm 3kFVJioZq1m/FCJ6mU2gch0g2uKlBQ7gRLPH56XnhpjhNRdx6HSI9reOdiWZ7dPXPT/x XsW1qmQyU7rFEMMQTT7WMDITaYaH8hcOlVsMIjVGAlhswomXl+ehfbPJXWkBIScJtt0A 1F/hPZQSEcFiU89sr0dKQx3BPb4Dxxv2hzlsRWvFWYZbzIhmGBz8KHTXntf9SDEM6h12 uPmA== MIME-Version: 1.0 X-Received: by 10.194.87.170 with SMTP id az10mr12945948wjb.144.1449173062571; Thu, 03 Dec 2015 12:04:22 -0800 (PST) Received: by 10.28.130.139 with HTTP; Thu, 3 Dec 2015 12:04:22 -0800 (PST) In-Reply-To: References: <8D2FB6BB73522DF-830-1B4E78@webmail-vm107.sysops.aol.com> Date: Thu, 3 Dec 2015 20:04:22 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: d7fcd9b75df8d1b09ddef9df028bd9ae Subject: Re: LF: More EbNaut 137.777 - Dec. 2/3 Content-Type: text/plain; charset=UTF-8 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 tB3K8lV0008463 Status: O X-Status: X-Keywords: X-UID: 5528 Rb is actually one of the lowest phase noise reference sources you can get - but really its all down to the OCXO used inside them. I believe they have better short term stability than Caesium, and certainly than GPSDOs. But use at LF is going to be quite uncritical of short term performance - the only thing that is going to matter is how accurate it stays over periods of hours. Andy G4JNT On 3 December 2015 at 19:55, wrote: > Delighted that the message found its way to Italy and to > at least one member of the Poldhu club! > > The discussion on Rb vs GPSDO is helpful, but I'm still undecided. > It's rumoured that Rb has phase noise and needs new lamps from time > to time. > > Thanks Edgar, Domencio, Markus, Paul and Andy. > > I'll try a longer message 39 characters, shorter symbols 0.5s and > 8K19A starting 2000 UT. > > 73 > Joe VO1NA > > > On Wed, 2 Dec 2015, Markus Vester wrote: > >> Indeed a strong signal (again)... hope the message will find it's way to >> Italy tonight ;-) >> >> Attached is the symbols plot for the 22 UT transmission, which decoded at >> 10.9 dB Eb/N0. On this small Win-10 convertible (Celeron 2x1.83 GHz), >> running through the phase permutations for a 25 character decode takes about >> 20 minutes. >> >> Good luck, >> 73, Markus >> >> >> -----Ursprüngliche Mitteilung----- >> Von: jcraig <jcraig@mun.ca> >> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org> >> Verschickt: Mi, 2 Dez 2015 10:02 pm >> Betreff: Re: LF: More EbNaut 137.777 - Dec. 1/2 >> >> Hi Paul, >> >> That's very helpful. The oscillator needs some work to improve our >> chances. >> >> In the mean time, how about a longer message, more power and shorter >> symbols. 9K19A 1 Second symbols 25 characters 500 watts. 2100 UTC. >> >> 73 >> Joe