Hi Tom, I re-connected the antenna to that unit just now, so it is now GPS locked again. Forgot to mention: another reason why ground loop currents for these single oven units are not an issue is that the current changes very little with temperature. In the plots you can see that the OCXO current is typ. less than 50mA, and the variation is typically less than 4mA peak to peak. A 4mA change is a very small change to affect ground-loop induced voltage offset errors across the ground plane, OCXO pin, etc. Nevertheless we do Kelvin sensing to avoid any issues for ovens with higher current variations. bye, Said In a message dated 2/5/2009 09:32:31 Pacific Standard Time, [email protected] writes:
>In your plots the EFC correction seems to match so well with >oven current (without clear evidence of the usual thermal lag) >could it be that what you're seeing, and what you're correcting, >is not resonator temperature at all but simply the voltage offset >due to ground currents? _______________________________________________ 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.
