[time-nuts] Adafruit Ultimate GPS Breakout

[Bob Stewart]

I got one of these, and the PPS looks good, though I don't quite have the equipment to measure it.  I am testing by comparing its PPS output to the PPS output of my Oncore UT+ with my 5334B on the "TI A->B" setting.  The difference seems to be bouncing around based on two variables:  1) The UT+ sawtooth seems clearly obvious and 2) I don't have it in "position hold", so the difference wanders around a bit.  In fact, I haven't looked at the documentation to see if it has a position hold command.  I don't have a GPIB interface to quantify things, either.  It's a nice little device, and I'd be interested in any measurements that someone with a better testing environment could make.

Bob - AE6RV





>________________________________
> From: David J Taylor <david-taylor at blueyonder.co.uk>
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Saturday, August 3, 2013 9:11 AM
>Subject: Re: [time-nuts] Radio Shack GPS Module
> 
>
>From: Tim Shoppa
>
>Very likely the Parallax PMB-648, a SirfStar III. A fair number of local
>radio shack stores have Parallax and Arduino stuff on the shelves without a
>Radio Shack part number.
>
>http://www.parallax.com/go/GPS
>=======================================
>
>If you want PPS output, and TTL/CMOS levels for serial are OK, this is a rather nice little module, cheaper than the Radio Shack item:
>
>http://www.adafruit.com/products/746
>
>Lower power as well, and more sensitive, and you can add a battery for backup.
>
>Cheers,
>David
>-- SatSignal Software - Quality software written to your requirements
>Web: http://www.satsignal.eu
>Email: david-taylor at blueyonder.co.uk 
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