Bill wrote:
How tough would it be to mate the 10Mhz version up to a really good 10811? * * * I was thinking of throwing the LTE-Lite and the 10811 in a box.
Unfortunately, to get the best out of the local oscillator, the control PLL must be carefully adjusted so that the oscillator itself controls the stability at averaging times (tau) where it is better than the GPS (generally, up to tau of several hundred to maybe several thousand seconds), and the GPS controls the stability at longer tau. The LTE-Lite has fixed (non-adjustable) loop parameters that cross over to the GPS at much lower tau than is appropriate for a good OCXO (but well suited to the installed TXCO).
The other day Said (I think) mentioned some hacks that may sort-of improve the ability of an LTE-Lite to discipline an OCXO, but that's all they are -- very approximate hacks. There is really no way to properly mate an OCXO to the LTE-Lite control loop, which would require adjusting the PLL loop gain and the location of the loop's poles and zeroes (and possibly even adding new poles and zeroes). That would need to be done by changing the PLL parameters internal to the LTE-Lite, which are inaccessible. Without such reprogramming, the LTE-Light can never get the best out of an OCXO.
Best regards, Charles _______________________________________________ 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.
