- Jun 1, 2003Trying to get my mobile/rover setup more convenient with respect to PC
real time clock setting/synch. Given I have one COM port in the old
ThinkPad, and the Rascal is already using it, I am considering a flash
card type GPS with PCMCIA adapter. I may well be able to use the flash
card GPS in a Palm to boot. I have about decided on a Delou GPSCFD unit
with PCMCIA adapter, extenal ant and software.
Question to group is really more related to what signals are available
coming to a PC from a PCMCIA card. Since the card is apparently "seen"
as a COM port, what lines are available that would be equivalent to
RS-232 lines - particularly the DSR and/or CTS line for the 1 PPS signal
that NMEATime requires. The Delou's unit supports NMEA 0183 (v2.2) with
GGA, GSA, GSV, RMC, VTG, and GLL - I'm learning more about NMEA gps
sentences than I ever cared to!! Actual lat/long fix is of secondary
importance - generally know where I am and also can generate high
detail/street level area maps with MapInfo of grid intersections I'm
So far, I've been blessed in that the old ThinkPad real time clock seems
to keep darn good time - certainly good enough for 6m FSK441. I just
set watch from home PC running D4 and then check and/or set the one in
truck May actually have to reset it a few seconds every week or so.
With Es season here, I'm guessing I will be trying JT44 and it will be
the mode that needs the tight time control - although JT6M seems to be
doing well for Es and timing requirements are no worse than FSK441.
Any GPS and/or PCMCIA guru's out there? Please respond direct. This
topic is certainly probably not of great interest to most.
TNX in advance - Bruce, KD5IUG