[time-nuts] Nortel GPSDO osc age alarm

GandalfG8 at aol.com GandalfG8 at aol.com
Fri Jan 24 06:30:53 EST 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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