Hi Don,
While I don't have this model, I had a problem with my Nortel-Trimble
NTGS50AA with similar symptoms. This was caused by the way the
interconnection between the two PC boards, they use a flat cable with
unkeyed connectors on it so they could be reversed. Using one of the the
straight ways, i.e. pin 1 to pin 1 and so on, the lights worked in a
strange way. Using the other way, the auxiliary board in front of the
main one and the cable straight between them, it worked ok. I can send
you a picture if you interested.
Regards & 73,
Ignacio EB4APL
El 20/06/2018 a las 13:46, donald collie escribió:
Hi, I just received one ex-China GPSDO`s which uses the assembly mentioned
above. It is nicely built, but has a design problem with the ACT
[activity], and ALM [alarm] LED`s on the ancilliary pcb not following the
LED`s on the Trimble pcb - they don`t activate properly. Would one who
knows please point me in the direction of the circuit of this assembly.
Also, would somebody who has a GPSDO which uses this assembly, please
confirm the correct led status when the crystal oscillator is correctly
diciplined by the GPS, and "on frequency"
Thankyou for your concideration of this!
Cheers................................................Don Collie
ZL4GX
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