Philip wrote:
few weeks ago I acquire TS2100GPS with TCXO. Few days ago receive MTI OCXO and install in device. After replacement change gain and filter constant as described byJason Rabel's post from 9/26/2010
Looking at that post in the list archive, it does not appear to describe any particular loop tuning solution -- Jason was asking a question regarding (i) whether the tuning parameters available in the 2100 would support an OCXO, and (ii) if so, what parameters should he use for his specific OCXO. It does not appear that he received any responses to his question.
Unfortunately I'm not happy with results because 10 MHz output signal after GPS lock (both leds on front "Locked" and "tracking" are "ON") has frequency drift (phase shift) with period around one second plus minus ~18 deg (+-5 ns) compared to other 10 MHz.
The PLL control loop is apparently unstable with the parameters you have programmed. You need to determine, first, whether the parameters available are sufficient to accommodate an OCXO and, if so, what specific parameters you need to program to achieve optimal (not just basically stable) operation. In other words, YOU have to answer Jason's question.
Best regards, Charles _______________________________________________ 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.
