...thanks, Bob, it seems to be the oscillator, that is at it's limit, it cannot tune to 10 MHz at full EFC voltage, see new thread (started by Mark).
Volker Am 24.01.2014 01:09, schrieb Bob Camp: > Hi > > That’s a cell phone base station board. It’s got a bunch of outputs, some of > which are related to the cell network it was built for rather than 10MHz. I’d > bet your 9.8 MHz output is one of those. They are DDS based so there likely > is some range of possible outputs. > > The age alarm is not unusual on a newly powered up board. It’s moving faster > than it should. It may settle down. > > The DAC at limit is not a real good sign …. > > Bob > > On Jan 23, 2014, at 6:43 PM, Volker Esper <ail...@t-online.de> wrote: > >> Hi! >> >> I bought a Trimble/Nortel GPSDO >> >> http://www.ebay.de/itm/300933951405?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2648 >> >> and Lady Heather's now tells me that everything is alright - except >> - DAC 6.000004V >> - OSC BAD >> - osc age alarm >> >> The rectangle "10MHz" output signal (J5) shows a signal at about 9.8MHz >> (a deviation of about 200kHz), wobbling 4Hz up and down. Oddly enough, >> the direct oscillator output (J4) shows a sine wave at a stable >> 10.0000004MHz (a deviation of 0.4Hz). >> >> It seems to me it's not the oscillator that is bad but the servo loop - >> what can I do? >> >> Thank you >> >> Volker >> _______________________________________________ >> 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. > _______________________________________________ > 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. _______________________________________________ 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.
