Hal Murray said the following on 10/07/2006 12:07 AM: > It's possible my mods to the Z3801A are different from what others > are using. I'm pretty sure I copied Jeff Mock's drections, but of > course I made a few "improvements". I think they were all physical > rather than logical. > > On a scope, my pulse is normally low, going high for 20 uSec. > (I'm actually standing on my head because the easy place to get > a scope probe is before a RS-232 driver. So I could easily have > something inverted.)
On my Z3801A, with this part of the mod done per Jeff's page and measuring the signal on the RS-232 wire using a breakout box, the DCD line is normally high and goes low for 20us; that's what I would consider "normal" RS-232 behavior, though most PPS sources are just the opposite since they're using a positive going pulse. By the way, I have my own mods page for the Z3801A at http://www.febo.com/time-freq/gps/z3801a/mods/index.html. John > Looks like my comment in > http://ntp.isc.org/bin/view/Support/ConfiguringHPZ3801ARefclocks > is backwards/confusing. Sigh. > _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
