); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY
>How do you distinguish this effect from oven temperature variations due >to finite thermal gain, particularly with a single oven OCXO? >For small changes the effects are both linear. Bruce many OXCO have an internal voltage reference that is brought out to a pin and I would guess the reference voltage would track the ground bounce. The catch is how stable is the internal voltage reference. If stable the difference between the reference voltage pin and EFC pin should cancel the ground bounce and expose the oven temperature error. A rather drastic alternative is to open the oven and solder a thin wire to a ground point close to the tuning diode. Then solder the other end of the thin wire to the main board DAC voltage reference ground. Lastly unsolder the OXCO +12V and ground pins from the main board and connect them to a separate isolated 12V supply. The thin wire has no heater current in it so all heater current drives the OXCO ground pin a fraction of a mV below the main board ground eliminating any EFC interaction. With great care I implemented the second approach. Peter _______________________________________________ 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.
