If one of the two units has a 10 uS wide pulse, I bet you have one of the two pluses inverted. Make sure one of the two is not flipped
On Fri, May 10, 2013 at 11:05 AM, Esa Heikkinen <[email protected]> wrote: > Hello! > > I bought Symmetricom Tymserve TS2100-GPS some time ago. When comparing it's > 1PPS with Thunderbolt they are not in sync: > http://www.amigazone.fi/files/gpsdo/ts2100-pps-offset.png > > Symmetricom seems to be always about 10 uSec ahead. If I turn of the power > and then on again, it will be in sync very short moment after the tracking > led is turned in. But then it will always roll itself at 10 uSec ahead and > lock there, when the locked led turns on. > > It seems that it has somehow wrong GPS PPS offset or maybe it's folloring > the 1PPS signal from it's internal GPS from the wrong edge (this is just my > guess; Thunderbolt has 10 uSec long PPS signal, maybe the internal GPS as > well?) > > I understand that TS2100 is not as accurate PPS source as Thunderbolt. But > it's manual claims that 1PPS accuracy should be 1 uS. So this is clearly out > of spec. This is strange because the Symmetricom seems to be high quality > product. Obviously not? > > Is there any way to fix this by adjusting some offset with telnet etc? If > not, maybe I try to invert the 1PPS from internal GPS. Or if someone knows > how to use Thunderbolt as a time source, I could use that and remove the > internal GPS... > > -- > 73s! > Esa > OH4KJU > _______________________________________________ > 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. -- Chris Albertson Redondo Beach, California _______________________________________________ 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.
