On 11/13/2011 10:36 AM, Peter Bell wrote: > I can let you know what I've found out about these units - I got given > a couple of dead ones and did a bit of poking around trying to get > them working. I didn't get that far, since one of the units was > easily fixed (the MAX882 3.3V regulator had failed) and the other > seems to have a faulty Rb absorption cell (it works if you swap the > cell from the other unit into it).
Here is a pile of photos I did while fixing one of mine. In this one the oscillator had drifted high, and wouldn't lock when warm. A tiny nudge to C217 and it is happy, the output should sweep to about 4ppm high. I suspect the PTC element on the xtal is dodgy too; It seems slower to settle than the other units. http://n1.taur.dk/fe5680a-2/ I figured they might be useful when trying to point out components and test points. /Kasper Pedersen _______________________________________________ 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.