Return-Path: X-Spam-DCC: paranoid 1481; 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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD,SPF_PASS 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 u9RJaRY7023362 for ; Thu, 27 Oct 2016 21:36:27 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bzqOI-0003u7-Tc for rs_out_1@blacksheep.org; Thu, 27 Oct 2016 20:31:06 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bzqOI-0003ty-Ks for rsgb_lf_group@blacksheep.org; Thu, 27 Oct 2016 20:31:06 +0100 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1bzqOG-0000eK-5d for rsgb_lf_group@blacksheep.org; Thu, 27 Oct 2016 20:31:05 +0100 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=mLvgUWw117po1650E0Zk8ZBnJbwEn1r4QWGWFwdnBBs=; b=5mLRhWUaPowc0m1ZNjKikenrgH yraqkKGDlIKWHFBsNfI8l9l1FvM1opN4RTzhSGhqIOIjP27gKRKJ8+uGI4gB0Mw27mPwYIiUxAfx9 ezhycklqod6SNYWY80NAD2XYt4DIN3qBmQ41uWiNeAvuLqMjk2cG7kzFq69UwlTF0llQ=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:51638 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1bzqOF-0002I3-Hh for rsgb_lf_group@blacksheep.org; Thu, 27 Oct 2016 20:31:03 +0100 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id F219A400623 for ; Thu, 27 Oct 2016 19:31:02 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <157b3bf43d2-111e-bfa3@webprd-a11.mail.aol.com> <5811C317.7000108@posteo.de> <1477585104.151596050@f13.my.com> From: Paul Nicholson Message-ID: <581255F6.9060705@abelian.org> Date: Thu, 27 Oct 2016 19:31:02 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <1477585104.151596050@f13.my.com> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org X-Scan-Signature: 4ead635eadbaebfaa92cfec77deb715d Subject: Re: LF: Re[2]: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2 Content-Type: text/plain; charset=utf-8; format=flowed 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 9263 I have used the Trimble Thunderbolt with its fixed 10uS pulse. It worked (vlfrx-tools, M-Audio 192) but timing jitter improved after a pulse stretcher increased the width to 1mS. As Andy says, the 10uS pulse energy was a bit low giving poor S/N and a jittery centroid of the smoothed pulse. Now I use a Ublox for timing VLF reception and this works fine. The Thunderbolt is used for calibration and as a reference for comparing my growing collection of GPSDOs. I'll be interested to see Wolf's comparison of edge and centroid timing. I've never had any luck with edge timing. -- Paul Nicholson --