Hi Paul,
First of all, thank you for your advice.
I did try with the cover on, and also with the magnetic shield on (which
consists of about three sheets of mu metal wrapped around the resonator
cavity over and below the board (you can see the slits on the bigger
board, on the pictures).
I've had mixed results, with the unit warmed up but without the cover, I
had the opportunity to have it locked for quite some time (about 8
hours) before powering it off again. Other times it doesn't lock. Other
times where the unit starts cold, after a couple of minutes locks for a
short (~30s) time and gets back to sweeping frequency (unlocked state).
I've seen that happen on an Efratom FRK with a defective resonator
thermistor, that's why my main suspect is the temperature.
I still have pending to attach the scope to the photodector amplifier to
check if I see the modulation signal. After that I think it all goes
digital so there's nothing much I can do. I did try varying the lamp
oscillator frequency but didn't notice any effect (kind of a long shot
since I don't know the right frequency), so I left it as it originally
was.
Kind regards!
---
Germán Herrera
Responsable IT
Ingeniería
SES Sistemas Electrónicos S.A.| Espinosa 1045 (C1405AMM) | Buenos Aires
| Argentina
W: +54 11 54538426 | Email: [email protected]
On 2020-08-10 10:21, paul swed wrote:
German have you tried with the cover back on?
The external light in your picture could be affecting the system.
The color of the RB lamp looks about right and its nice and bright.
Also most Rbs I have worked on tend to insulate the various ovens and
such.
Temperature matters.
Regards
Paul
On Mon, Aug 10, 2020 at 9:15 AM Germán Herrera <[email protected]>
wrote:
Hi everyone
This is my first post on the list, tought I've been subscribed for
some
time.
I'm in the process of troubleshooting an X72 which recently started to
be unable to acquire lock. I've searched online for pics of this
standard and wasn't unable to find anything, so i took some nice
pictures which I'd like to share with you:
https://drive.google.com/drive/folders/1HN8dms5CxPwUjdckEux2fOVTF5IoaI5u?usp=sharing
After disassembling it I found that an optical filter which is
supposed
to be glued to the light path of the lamp was loose inside the unit. I
attached it again but the issue persisted.
If anyone is able any information about the thing (such as lamp
working
temperature, resonator temperature, lamp excitation frequency, etc..)
I'd be grateful. It's sad that Symmetricom's manual is not able to
provide any useful details.
Cheers!
--
Germán Herrera
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
