[time-nuts] Nortel GPSDO osc age alarm
GandalfG8 at aol.com
GandalfG8 at aol.com
Fri Jan 24 11:30:53 UTC 2014
Whilst on second thoughts it does seem a bit odd that this oscillator has
passed 10MHz and still not locking this might be linked to the alarms being
generated at around 5.6 volts as per my previous comment, even though the
EFC voltage at the extreme does, theoretically at least, seem to be enough
to implement the control function.
I would still be very inclined with this unit to remove the oscillator and
test it on its own.
Regards
Nigel
GM8PZR
In a message dated 23/01/2014 23:59:34 GMT Standard Time,
ailer2 at t-online.de writes:
Hi!
I bought a Trimble/Nortel GPSDO
http://www.ebay.de/itm/300933951405?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m
1497.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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