Hi Ed, > When it locks for a few seconds, make a note of the VCXO control > voltage. Watch it as closely as you can during the lock period. Is it > very near one end of the sweep range? Does it then drift off the end of > the range when lock is lost? That behaviour would suggest that the VCXO > has drifted out of range as Bob suggested. But if the voltage stays > more towards the middle of the range (like 4D, 4C) that's not going to > be the problem. You could also watch the output frequency since it > tracks the frequency. Whichever is easier.
Thanks for the tips. Will try that within the next few days. > Also, check for obvious things like bad capacitors. Living next > to that physics package must be a hard life for any capacitor! That was my first thought too. But I checked the capacitance and esr of all the al and tantalum caps - everything within reasonable values. Seems like they got really good quality ones and did their homework on this part of the design. Kind regards, Gerd _______________________________________________ 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.
