[time-nuts] Temex LPFRS-01 / LPRO rubidium reference repair
Gerd v. Egidy
lists at egidy.de
Sun May 26 17:05:28 EDT 2013
> 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
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