Hi The only way to be sure on either the sawtooth or the cable delay is to try it and see. I have observed it being put in backwards (in both cases) more often than I have seen it put in the right way around.
Bob > On Jul 19, 2016, at 12:47 PM, Mark Sims <[email protected]> wrote: > > While on the subject of antenna cable delay and sawtooth values, I have only > seen Trimble document the sign of the value that you enter to compensate for > cable delays (for Trimble devices you enter a negative value). Other > receivers may require a positive or negative value. Also, some receivers > will not accept will not accept negative cable delay values and can only move > the PPS in one direction from nominal using their cable delay feature. > > Also, I have never seen anybody document how the sign of their reported > sawtooth compensation value relates to the PPS edge. For some receivers it > is the offset of the PPS edge from true time. For others it is the delay you > need to apply to the edge to get it to true time. > > Asking the manufacturer about either value may or may not give the correct > answer. The only way to know for sure is to test it... and that requires > comparison to a known to be correct and very accurate PPS source... > > > ------------------------ > >> The systems that use 1PPS delay chips solve your worry with an at-power-on >> adjustment to the receiver's antenna delay parameter. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
