[time-nuts] New timing receivers?

Bob Stewart bob at evoria.net
Mon May 5 16:36:09 UTC 2014


Any progress on the Adafruit PPS study?

(Hope this isn't a dupe.  Yahoo's mail scripts have problems today.)


> From: Tom Van Baak <tvb at LeapSecond.com>
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Monday, April 28, 2014 1:56 PM
>Subject: Re: [time-nuts] New timing receivers?
>> I don't see that behavior.  Looking at ~24 hours of data I have 1,024
>> unique (x,y) coordinates (as reported by the GGA sentence).  The standard
>> deviation of the error relative to the median (x,y) position is 1.2 meters.
>I agree. I have 30 days of Adafruit data; the
 position is never quite static, bounces around over a couple of meters as one would expect for a receiver in 3D mode. Send me email off-list for details about lat/lon/alt RMS deviation and scatter plots.
>On the other hand, I have a second "identical" Adafruit receiver with distinctly different deviation patterns. I'm working through that mystery now. Nothing with this hobby ever ends up being a simple quick test.

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