Hi, On 08/15/2018 06:03 AM, Björn wrote: > Hi Bernd, > > One reference to 20us 1PPS pulse length is the ICD-GPS-060, see figure 3-2, > page 3-3 (pdf page 19) > > https://www.navcen.uscg.gov/pdf/gps/ICD-GPS-060B.pdf
However, very few boxes does deliver 10 V amplitude PPS pulses. They may be 20 us, but then as "TTL levels into 50 Ohm" meaning a peak of about 2,5 V as result of 50 Ohm source impedance and 50 Ohm load impedance voltage dividing the driving 5 V. The MIL-STD-188-115 also has the same specification on page 12. There are a few more in that cluster. I have not bothered to pull them all down. It relates to the PTTI Interface so I expect them to be similar. > Group - Are there other standard documents defining duty-cycle, voltage > levels, rise times etc? I think ITU managed to put one in their standards (finally), I'll check for it. Cheers, Magnus > MfG > > Björn > >> On 14 Aug 2018, at 20:52, Bernd Neubig <[email protected]> wrote: >> >> Another question, a bit off the road of this thread: >> Is there any common practice for the duty cycle of the 1 PPS pulse? >> I have seen devices having extremely short 1 PPS pulses with duty cycles of >> a few percent or less and others with close to 50% duty cycle. >> >> Best regards >> Bernd >> DK1AG > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
