I thought it was only standard practice, now I see that there are standards and requirements too.
On Mon, May 14, 2012 at 6:33 PM, <b...@lysator.liu.se> wrote: > Mark & Azelio, > > Or even 10V into 50ohm, 20us... See figure 3-4 in ICD-GPS-060. > > http://www.navcen.uscg.gov/pdf/gps/ICD-GPS-060B.pdf > > More modern 3-5.5V into 50ohm, 20us. > > http://contracting.tacom.army.mil/majorsys/jab/DAGR%20Interface%20Specification.pdf > > Above are two standards demanding short skinny 1PPS pulses. Are there any > other standards with distinct shape requirements on 1PPS pulses? > > -- > > Björn > > > Feed a 5V 1Hz square wave into a 50OHM load and look at the power drain. > > Do > > the same with a 100uS pulse and smile at the difference. > > > > On Mon, May 14, 2012 at 5:23 PM, Mark Sims <hol...@hotmail.com> wrote: > > > >> > >> My first inclination, if I were building a timing receiver, would be > >> to > >> make the PPS output a nice, symmetrical square wave. But pretty much > >> all > >> GPS timing receivers output an anorexic, dinky little heroin addicted > >> supermodel sized pulse (from 1 to 150uS wide is typical). > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
