[time-nuts] Nortel GPSDO osc age alarm

Volker Esper ailer2 at t-online.de
Thu Jan 23 18:43:13 EST 2014


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


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