[time-nuts] adafruit $40 GPS
lists at lazygranch.com
lists at lazygranch.com
Tue May 14 18:39:23 EDT 2013
The operative question how significant is the error when used for NTP.
If the adafruit is the path of least effort and the error is not significant, I'd spend the extra $20.
From: Chris Albertson <albertson.chris at gmail.com>
Sender: time-nuts-bounces at febo.com
Date: Tue, 14 May 2013 15:22:05
To: Bert, VE2ZAZ<ve2zaz at yahoo.ca>; Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Subject: Re: [time-nuts] adafruit $40 GPS
OK, not useless, just an order of magnitude worse than something that
cost less than 1/2 the price. But you are right that many people only
care about hundredths of seconds.
The main problem with the nav receivers is they don't do a self survey
so there is some position uncertainty. But that only applies if you
care about nanoseconds.
On Tue, May 14, 2013 at 12:48 PM, Bert, VE2ZAZ <ve2zaz at yahoo.ca> wrote:
> Why should a navigation GPS be useless for timing? A lot of people use Oncore GT+ GPS's with satisfactory results. In the end, it all depends on the performance you expect from your system...
> Bert, VE2ZAZ
> Date: Tue, 14 May 2013 09:02:17 -0700
> From: Chris Albertson <albertson.chris at gmail.com>
> To: Discussion of precise time and frequency measurement
> <time-nuts at febo.com>
> Subject: Re: [time-nuts] adafruit $40 GPS
> <CABbxVHuo5uPb7OXj7bbrvcuZWdxZm9GExngS90N9N2iC3DUGgQ at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> The adafruit GPS has a built in antenna. But you can add an external one.
> But why use this for timing? They don't even give a spec for timing
> accuracy and it is likely NOT a timing GPS. It is a navigation unit.
> Pretty much useless for timing.
> Also the price is to high. You can do better in eBay, real timing
> units sell for as little as $15.
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