Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w0M7B9Q2024066 for ; Mon, 22 Jan 2018 08:11:10 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1edW4H-0007gr-Fm for rs_out_1@blacksheep.org; Mon, 22 Jan 2018 06:58:57 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1edW48-0007gi-QX for rsgb_lf_group@blacksheep.org; Mon, 22 Jan 2018 06:58:48 +0000 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 4.89) (envelope-from ) id 1edW45-0002pC-0h for rsgb_lf_group@blacksheep.org; Mon, 22 Jan 2018 06:58:47 +0000 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:MIME-Version:Date: Message-ID:Subject:From:To:Sender:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=cDf5z/ZcpCE1SkevbH6AZl0dpDoe9DE7bi53OOv9fHY=; b=eZspRzjCoq+e/yKydZmmwaldc4 ZJQ6de0HqUN7P+t0xFdEcX6oueEmarvkVIw7VdtcgWXCNQar8/vA7xcfTnlNrWz55ZHhsy6by1xu+ yCEd4NmAF05pYtM3yFngx8+g1EhjFm4vfNNi2jdZE6FNhnJVq2EaiddZNDgUr86GzJ8Q=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:54732 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1edW42-0001YD-5d for rsgb_lf_group@blacksheep.org; Mon, 22 Jan 2018 06:58:42 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 9C155400418 for ; Mon, 22 Jan 2018 06:58:41 +0000 (UTC) To: rsgb_lf_group@blacksheep.org From: Paul Nicholson Message-ID: Date: Mon, 22 Jan 2018 06:58:41 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 Content-Language: en-US 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-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: A GPS based frequency standard I put together over the weekend. http://abelian.org/vlf/tmp/180121a.jpg http://abelian.org/vlf/tmp/180121b.jpg Based on a Trimble 57963 GPS disciplined OCXO, I added a divider and power supply. It produces signals with very good short term and long term phase stability. There is a DC coupled output (CMOS logic level) and AC coupled (for sound card input). [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: LF: GPS locked frequency standard Content-Type: text/plain; charset=utf-8; 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 A GPS based frequency standard I put together over the weekend. http://abelian.org/vlf/tmp/180121a.jpg http://abelian.org/vlf/tmp/180121b.jpg Based on a Trimble 57963 GPS disciplined OCXO, I added a divider and power supply. It produces signals with very good short term and long term phase stability. There is a DC coupled output (CMOS logic level) and AC coupled (for sound card input). It's an arrangement I've often used for testing sound cards and changes to vttime, but each time I cobbled together a divider on breadboard. Now finally got around to putting it in a box, it is much simpler to use. I'm intending to do a lot more work on the Raspberry Pi and Octo card combination so will be making plenty of use of this. -- Paul Nicholson --