Philip Zahariev via time-nuts kirjoitti:
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. I measure this by 2 channel scope on 10 nS sweep, first channel connected to TS2100 10
Yes it works like that and it seems to update the DAC value once per second. Frequency wobbling is perfectly in sync with PPS output, which is kind of logical.
If you look TS2100 manual it says "stand alone time server" which means it's designed to serve as time standard - not as frequency standard. If you need stable frequency then you should try with Rubidium oscillator or with some other GPS unit. For example Thunderbolt has much more stable frequency output than TS2100, but it's also a timing receiver, not frequency standard.
However with OCXO and GPS upgrades you will get more than 10 times better timing than original TS2100. Without upgrades the TS2100 PPS is just below 1 microsecond, with MTI OCXO and Heol Design N024 GPS board it's about +-50 ns. So it's relatively good for every day timing purposes.. :)
Of course you could try could be to play with timing constant settings but I don't think it would help anything if the DAC is still written once per second. But if you find better values please let us know!
Best regards, -- 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.
