Bob Marshall kirjoitti:

We have TymServe 2100 units and need the IRIG-B signal.  They are
> disconnected from GPS and running in free mode.  I’ve set the time
> via telnet but can only do that within about 250 milliseconds of
> the correct time.  I see the engineering command “root engineering
timing offset_time” but when I try it nothing happens to the time.

It's for GPS and maybe also for external fed PPS also (not tested that). Some units, like mine had 10 us error in the PPS output and it was possible to fix this by setting that offset to zero. I have not tested that with PPS because there's no error.

To correct a -200 millisec error (reported by ntpq -p) I try:
“root engineering timing offset_time 2000000” (the units are
>  100ns).

According to my own tests I think that command doesn't do anything without GPS or (maybe) external PPS.

Only way to get it in time is to feed it with external PPS first, let it lock to the external PPS (having all three leds on) and THEN adjust the time from telnet.

But without external PPS there's no point to adjust that 250 ms. error, because it will be there again after couple of days. It won't keep the time very well without any external reference unless it's rubidium based version.

Also, when adjusting the time from telnet you may end up always having 1 second offset (because it may be little bit hard to press the enter just correct time). In that case you can use the leap second command to adjust the time. Just program the leap second event to nearest minute change and it will happen then. By doing this it's much easier to remove 1 second error than trying to press return in the telnet just in correct moment. You can add or remove the leap second.

--
73s!
Esa
OH4KJU

_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Reply via email to