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=-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 u328JfXq014191 for ; Sat, 2 Apr 2016 10:19:41 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1amGev-00026m-6F for rs_out_1@blacksheep.org; Sat, 02 Apr 2016 09:11:53 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1amGeu-00026d-MK for rsgb_lf_group@blacksheep.org; Sat, 02 Apr 2016 09:11:52 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1amGet-0004q5-1i for rsgb_lf_group@blacksheep.org; Sat, 02 Apr 2016 09:11:51 +0100 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 378BF3273E4 for ; Sat, 2 Apr 2016 09:11:16 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 75FB528A010B for ; Sat, 2 Apr 2016 08:11:48 +0000 (UTC) Message-ID: <56FF7EC4.8020106@abelian.org> Date: Sat, 02 Apr 2016 08:11:48 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <56E02A1B.9020309@abelian.org> In-Reply-To: <56E02A1B.9020309@abelian.org> X-Scan-Signature: c1f72e5acb1277e013f90c915ad7ad68 Subject: Re: LF: Another GPSDO Content-Type: text/plain; charset=ISO-8859-1; 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: 7562 I wrote: > http://www.ebay.co.uk/itm/GPS-DISCiPLINED-CLOCK-GPSDO-10MHz-10M-OUTPUT-SQUARE-WAVE-RS232-OUTPUT-GPS-NMEA-s-/252011014153 After some trials I find this GPSDO is not so good after all. The 10MHz output is stable at about 9999999.9991 Hz, it appears locked by the GPS but at the wrong frequency due to some defect in the control loop. It is apparently a known problem and appears on all the variations of BG7TBL's GPSDO. Another problem is that you cannot send RS232 commands to the GPS chip - its serial input is taken up by the on board controller. So I can't recommend this one. It's a pity because it's a neat low cost unit. Now I'm about to buy one of these instead https://www.tindie.com/products/nsayer/gps-disciplined-ocxo/ -- Paul Nicholson --