David Lord wrote: [] > First I don't think there's any problem getting the nmea down > twisted pair at 4800 baud.
.. agreed, but ..... > To play safe with the ttl level pps I've setup to use a simple > emitter follower that can drive into 75r coax. > > I didn't want to use line drivers as I don't have any handy that > work off single 5V supply. > > I need a converter back to ttl before going to pc and don't have > any spare gates in the box with compulsory flashing led and > ticker, so will use another couple of transistors wired as > Schmitt trigger. > > > David I think you're needlessly overcomplicating the PPS signal. I have the GPS 18LVC feeding /two/ parallel RS-232 interfaces, /and/ a low-current LED, so for a 30m length I think you would get away with a simple wire connection. However, have fun with the soldering iron! If you're seeing 4us offset now, that may be as good as it gets. You may need a more constant temperature to see better. Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
