From: "Randy Warner" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Falling Edge Error Date: Mon, 14 Aug 2006 10:00:35 -0700 Message-ID: <[EMAIL PROTECTED]>
> Guys, Randy, > Maybe it would be better to call it the "leading" edge? It got my vote at least. ;O) > I have actually > sent out a couple of our SynPaQ receivers with the 1PPS jumper in the > "inverted" position per customer request. There always have to be a > couple of oddballs..... Yeah... but there is another reason, there is infact an IRIG format which sends time-code in the PWM of the PPS (or indeed other frequencies), but will leave the rising edge intact. Quite handy infact. I have considered using it. That IRIG format isn't perfect however. It doesn't convey all the info you want. Ah well. A good format would convey UTC time, date and TAI-UTC difference. Cheers, Magnus > Randy > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Normand Martel > Sent: Monday, August 14, 2006 4:40 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Falling Edge Error > > If i'm not wrong, virtually ALL GPS modules have their timing > standardized on the RISING edge and do NOT guarantee anything about the > falling edge. > > Glenn's measurements confirm that fact... Ideally, to get sure the users > will use the rising edge, that signal shall be a sawtooth!!! (or > simpler: a random falling edge.) > > 73 de Normand VE2UM > Montreal, Qc. Canada > > --- Glenn <[EMAIL PROTECTED]> wrote: > > > > > I just tried a quick test with my HP 5334A, with a LPRO to TVB divider > > > on channel A and an Oncore UT+ on channel B. > > > > frequency difference: > > measured on the falling edge: 37E-9 Hz measured on the leading edge: > > 6.7E-9 Hz > > > > Both measurements are from the rising or falling edge of the 1 PPS of > > the GPS, 100 sample average. > > > > cheers, > > glenn > > > > > > _______________________________________________ > > time-nuts mailing list > > [email protected] > > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
