From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yx0-f171.google.com (mail-yx0-f171.google.com [209.85.213.171]) (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 A920C21F0AE for ; Thu, 10 May 2012 11:11:49 -0700 (PDT) Received: by yenq11 with SMTP id q11so3549183yen.16 for ; Thu, 10 May 2012 11:11:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:cc:content-type; bh=KD8HdV7U/2BjEnFsrFo0M2BfVZu12hXBJacIBHrNvCM=; b=HIPId4OWB2Ar/vXNoG840vUmAKr7lDheW6pON46CkoVIRw1yzSEbAN73XDewP0JYjl 6SJL3BwD5VNq26TNUjibaw1DUKRXZ85XoeSetvyaxA7Sgqnzf7j3awFgw5izg2TLwUy4 NuOMULAW56aybB3x0riFwB7Qzl4qzZwiY9xfQ2mCWOMZbZ6CAhrcXTMLgSIQhCeKipyg xwRermLKhLC1avPGtOlJ0crclz9bPO/QLnInAULBw7agZ2NtbvVNA7vo/G00IMrjE+R+ j8BZ6V8hNxL4G5yEXVPHlnTx2/JRqUOuTIlloYd9LgSZKLZuH5jkqk5Z7a9poGFKXl7N I75Q== Received: by 10.60.0.135 with SMTP id 7mr3536524oee.25.1336673506037; Thu, 10 May 2012 11:11:46 -0700 (PDT) MIME-Version: 1.0 Sender: tz2026@gmail.com Received: by 10.182.113.40 with HTTP; Thu, 10 May 2012 11:11:25 -0700 (PDT) In-Reply-To: <20120510180317.GD16595@thyrsus.com> References: <03a101cd2e53$b5911580$20b34080$@navisys.com.tw> <048001cd2e99$1190d1f0$34b275d0$@navisys.com.tw> <20120510094342.3babc5ba.gem@rellim.com> <20120510180317.GD16595@thyrsus.com> From: tz Date: Thu, 10 May 2012 14:11:25 -0400 X-Google-Sender-Auth: ndN_9s8fayT9DpHPEwY6bJkeqo0 Message-ID: To: esr@thyrsus.com Content-Type: multipart/alternative; boundary=e89a8fb1ffe0820f4404bfb28d8b Cc: thumbgps-devel@lists.bufferbloat.net, veronica , tcf@navisys.com.tw, Jau-Yang Chen , gloria@navisys.com.tw, lily , "Gary E. Miller" Subject: Re: [Thumbgps-devel] supercap vs. battery in Macx-1 GPS receiver 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: Thu, 10 May 2012 18:11:49 -0000 --e89a8fb1ffe0820f4404bfb28d8b Content-Type: text/plain; charset=ISO-8859-1 Also the Ephemeris doesn't help if you move more than about 500 miles from the last place it was turned on. Until it can get at least a 2d fix and new latitude/longitude, it won't know which satellites to look for. The same thing happens with AGPS (the ephemeris usually lasts for a week but not more). You need to know the UTC time and the lat/lon within 500 miles. On my old Nokia n810 you could tap your location. On Thu, May 10, 2012 at 2:03 PM, Eric S. Raymond wrote: > Gary E. Miller : > > Yo Jau-Yang! > > > > On Thu, 10 May 2012 18:38:41 +0800 > > "Jau-Yang Chen" wrote: > > > > > After being fully charge, the supercap in Macx-1 could last around 4 > > > hours, and around one week for Li-ion battery, > > > > Well, that explains my one hour cold start when receiving the sample > > units. One week hold-up is pretty short, and 4 hours hardly worth the > > effort. > > > > Luckily the thumbgps project is for always on, but for weekend use > neither > > is good. Most mouse GPS have batteries are good for a month or more of > > standby. > > Opps, wires are crossed here - I believe cjy was speaking > subjunctively and the device as shipped has a Li-ion battery in it, > but the supercap is a manufacturing option. He'll correct me if I'm > wrong. > -- > Eric S. Raymond > > _______________________________________________ > Thumbgps-devel mailing list > Thumbgps-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/thumbgps-devel > > --e89a8fb1ffe0820f4404bfb28d8b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Also the Ephemeris doesn't help if you move more than about 500 miles f= rom the last place it was turned on.=A0=A0 Until it can get at least a 2d f= ix and new latitude/longitude, it won't know which satellites to look f= or.

The same thing happens with AGPS (the ephemeris usually lasts for a wee= k but not more).=A0 You need to know the UTC time and the lat/lon within 50= 0 miles.=A0 On my old Nokia n810 you could tap your location.

On Thu, May 10, 2012 at 2:03 PM, Eric S. Raymond <esr@thyrsus.com> wrote:
Gary E. Miller <gem@rellim.com>= :
> Yo Jau-Yang!
>
> On Thu, 10 May 2012 18:38:41 +0800
> "Jau-Yang Chen" <cj= y@navisys.com.tw> wrote:
>
> > After being fully charge, the supercap in Macx-1 could last aroun= d 4
> > hours, and around one week for Li-ion battery,
>
> Well, that explains my one hour cold start when receiving the sa= mple
> units. =A0One week hold-up is pretty short, and 4 hours hardly worth t= he
> effort.
>
> Luckily the thumbgps project is for always on, but for weekend use nei= ther
> is good. =A0Most mouse GPS have batteries are good for a month or more= of
> standby.

Opps, wires are crossed here - I believe cjy was speaking
subjunctively and the device as shipped has a Li-ion battery in it,
but the supercap is a manufacturing option. He'll correct me if I'm=
wrong.
--
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0<a href=3D"http://www.catb.org/~esr/">Er= ic S. Raymond</a>

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