[time-nuts] Symmetricom TS2100-GPS - 1PPS has 10uS offset
jason at extremeoverclocking.com
Tue May 21 09:31:28 EDT 2013
They removed the compensation delay from the menus & telnet interface starting with firmware 4.0 :(
Is there any way to save the setting in the eng/timing/offset menu choice? I've seen it set to different values on various TS2100's,
so I don't know if it is auto-calculated somehow or what.
> Sorry, I haven't tracked this group for a while. Too much work :-)
> You are intuitive. I expect that the TS21 is triggering on the wrong edge.
> Way, way back when the TS21 was invented, we were using an external Acutime
> antenna that had an open collector pps, hence falling edge trigger. When we
> added support for an onboard gps, they muxed the two 1pps sources together and
> we had an incompatible trigger logic problem. The way I fixed it at the time
> was to empirically measure the pulse width and use the antenna delay compensation
> field to "correct" the pps. This value was stored in e2 at mfg time based on gps
> receiver module. At some point, your unit must have not been set or been set to
> incorrect value or had its gps receiver replaced. Is there an antenna prop delay
> command available you can use?
More information about the time-nuts