[time-nuts] Inexpensive modular gps with 1pps
Hal Murray
hmurray at megapathdsl.net
Sat Dec 15 08:19:13 UTC 2012
ghane0 at gmail.com said:
> You mention "low cost units which require you to add a power connector,
> etc". Could you recommend any that can be bought online? With RS-232,
> please?
There are two obvious choices. A bit of googling may find more details
and/or other boards.
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The new favorite is the Sure demo board.
http://www.sureelectronics.net/goods.php?id=99
http://www.sureelectronics.net/goods.php?id=98
(The version with the Bluetooth is cheaper than the one without. ??)
http://www.satsignal.eu/ntp/Sure-GPS.htm
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The old standby is the Garmin GPS-18x-LVC. Garmin makes several versions of
the GPS-18x.
http://www8.garmin.com/manuals/GPS18x_TechnicalSpecifications.pdf
Be sure to get the LVC version. The others don't have a PPS.
I got mine from Provantage for roughly $70.
http://www.provantage.com/garmin-010-00321-36~AGRMO006.htm
Setup info:
http://time.qnan.org/
http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm
The GPS-18 (no x) is the older version. You probably can't find it for sale.
It's much less sensitive, but gave much better timing over the serial port.
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The GlobalSat MR350P is another option. It comes with a PS2 connector, but
you can chop that off. Their adapter cable doesn't include the PPS.
http://www.usglobalsat.com/p-58-mr-350p-bulkhead.aspx
http://www.usglobalsat.com/store/download/58/mr350p_ds_ug.pdf
That PPS is only 1 uSec wide which may be too narrow for some/most systems to
capture.
They sell a couple of adapter cables, but none of them support PPS.
You can stretch the PPS signal with the TAPR FatPPS.
http://www.tapr.org/kits_fatpps.html
--
These are my opinions. I hate spam.
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