From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-we0-f171.google.com (mail-we0-f171.google.com [74.125.82.171]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 7A60E200252 for ; Sat, 24 Mar 2012 08:06:20 -0700 (PDT) Received: by werm1 with SMTP id m1so6028194wer.16 for ; Sat, 24 Mar 2012 08:06:18 -0700 (PDT) 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 :cc:content-type:content-transfer-encoding; bh=6p6dQGsEGHBD79Uo8nT/bAUnrpUbIAsaN7HGwVbh1O4=; b=hf3PkuU4p85mHQVRMsZo0CbxincwLb/mU8kL1VB+idStnHXK+pbGQ1J3iihWtxbPaU oJ74gRaYe4VWRHUcpjFcQvOI970Xo1H3FK7cwXWWcs6eFQpkgdYphS0I/qlSwIxiRWZv qdvxKNMSrJMElLPRQT/0l9gs8fvciHsOFxTR4P1yf1aoJd3UKoBgjwQ+0pBWHOFvbuMu BUx2BmuH2NuKawk/329w4UBaM47F8dCvcbsdF9ndCMX7dAu7SUHwy8W3UyujqCVbdEIG 3xDIkuemHTbLpzeQliglsIcvNBT7SCLUmMq6bBD7m9NB5xx9eszm3nrAggEo0EMqfdFG /EaQ== MIME-Version: 1.0 Received: by 10.180.14.73 with SMTP id n9mr5421907wic.16.1332601578130; Sat, 24 Mar 2012 08:06:18 -0700 (PDT) Received: by 10.223.127.194 with HTTP; Sat, 24 Mar 2012 08:06:18 -0700 (PDT) In-Reply-To: <4F6DD6AF.1040901@c3energy.com> References: <4F6CE652.2010309@c3energy.com> <4F6D285C.1070505@c3energy.com> <4F6D3E94.4080902@c3energy.com> <4F6D6BEB.1070606@c3energy.com> <4F6DD6AF.1040901@c3energy.com> Date: Sat, 24 Mar 2012 08:06:18 -0700 Message-ID: From: Dave Taht To: "Ron Frazier (NTP)" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "thumbgps-devel@lists.bufferbloat.net" Subject: Re: [Thumbgps-devel] YEA! My Sure Electronics GPS just arrived. X-BeenThere: thumbgps-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Mar 2012 15:06:20 -0000 My kvetch is that I never know what units anything is in anymore. On Sat, Mar 24, 2012 at 7:14 AM, Ron Frazier (NTP) wrote: > Since I wrote that, it seems to have centered itself around zero. =A0I no= w > have a very nice + 1.2 ms / - 1.2 ms offset pattern. =A0Since I've been > struggling to get anything under 50 ms with other technology, this looks > really sweet to me. > > http://dl.dropbox.com/u/9879631/Sure%20board%20first%20night%20pt1.jpg > http://dl.dropbox.com/u/9879631/Sure%20board%20first%20night%20pt2.jpg > > Conversion of these images to jpeg reduced the clarity a bit, but you can > still see what's happening. > > Sincerely, > > Ron > > > > On 3/24/2012 4:21 AM, Andrew McGregor wrote: >> >> I know why it isn't centered... it's because it is taking a USB polling >> round trip to get the signal back. =A0The PPS happens somewhere between = two >> polls every 1 ms, and it takes another 1 ms to come back. >> >> On 24/03/2012, at 2:38 PM, Ron Frazier (NTP) wrote: >> >> >>> >>> I now have the PPS circuit working on the Sure board. =A0I have not >>> soldered it yet. =A0I just taped a jumper wire between the PPS test poi= nt at >>> the edge of the board and the DCD pin 1 on the RS-232 port. =A0The seri= al data >>> is coming in through the Trendnet TU-S9 serial - USB converter, which i= s >>> passing DCD. =A0I'm getting + .5 / - 1.5 ms offsets. =A0The PPS is nowh= ere to be >>> seen on the statistics screen, but it is obviously working. =A0I don't = know >>> why it's not more centered around zero, and maybe that will change. >>> =A0However, my total peak to peak range of offset variance is 2 ms, and= that's >>> coming through USB. =A0If I can maintain that level of accuracy, and it= 's >>> consistent with UTC, then I'm very happy. =A0That's plenty good for my >>> purposes. =A0I still may try to run it through a real serial port on an= other >>> machine just for kicks. >>> >>> Sincerely, >>> >>> Ron >>> >>> > > > > > -- > > (PS - If you email me and don't get a quick response, don't be concerned. > I get about 300 emails per day from alternate energy mailing lists and > such. =A0I don't always see new messages very quickly. =A0If you need a > reply and have not heard from me in 1 - 2 weeks, send your message again.= ) > > Ron Frazier > timekeepingdude AT c3energy.com > > _______________________________________________ > Thumbgps-devel mailing list > Thumbgps-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/thumbgps-devel --=20 Dave T=E4ht SKYPE: davetaht US Tel: 1-239-829-5608 http://www.bufferbloat.net