On 12/15/2012 12:19 AM, Hal Murray wrote:
gha...@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.
----------
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
Does this provide 10 MHz or 1pps?
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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