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bg7tbl gpsdo master reference

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Ringmodulator:
Hi Chris,

afaik, the 8663-XS needs 12V

https://www.miedema.dyndns.org/fmpics/Circuits_online/ocxo/8663_datasheet_ed.03-2003.pdf

Please check. You can configure the board to supply 12V to the OCXO.

Regards
Chris

dekagon:

--- Quote from: kj7e on June 24, 2019, 03:50:57 am ---Just wanted to add, finally getting the ublox NEO-M8T configured, enabled Galileo and tracking 20+ sats now. After a few other configuration changes I can say it seems to lock down to 0.00ppb very quickly and is rock solid.  Still sorting through the 400 page book on this chip.

--- End quote ---

Hi kj7e,

did you have some configuration tips for my neo-m8t configuration? I can see all sats which I want (gps, galileo and glonass) but after exchange of the neo module my bg7tbl gpsdo will not run properly.
The RUN Led ist permanently on and the LOCK Led will no longer light on after the gpsdo is going in lock mode. It seems so because the frequency will be relatively stable after a few minutes but I cannot proof it.

Would be nice if you could help.

Cheers Chris

nctnico:
There are many settings in the uBlox module to make it work as a stationary GPSDO (including setting the OCXO parameters and teach-in time for the stationary position). Having it locked doesn't say much as your clock output can still wander like crazy due to wrong settings. You need at least 2 other know-good GPSDOs to make a 3 cornered hat assesment of whether you modified GPSDO works OK. Every measurement needs to run for at least 24 hours, preferably 48 hours.

dekagon:

--- Quote from: Ringmodulator on August 07, 2023, 05:12:29 pm ---Hi Chris,

afaik, the 8663-XS needs 12V

https://www.miedema.dyndns.org/fmpics/Circuits_online/ocxo/8663_datasheet_ed.03-2003.pdf

Please check. You can configure the board to supply 12V to the OCXO.

Regards
Chris

--- End quote ---

Hi Chris,

yes I changed the SMD resistor to the 12 Volts place (see pictures in message #955) after exchange to the 8663 ocxo and  back to the 5 volts place after changing back to the original ocxo.

Cheers Chris

dekagon:

--- Quote from: nctnico on August 07, 2023, 09:06:12 pm ---There are many settings in the uBlox module to make it work as a stationary GPSDO (including setting the OCXO parameters and teach-in time for the stationary position). Having it locked doesn't say much as your clock output can still wander like crazy due to wrong settings. You need at least 2 other know-good GPSDOs to make a 3 cornered hat assesment of whether you modified GPSDO works OK. Every measurement needs to run for at least 24 hours, preferably 48 hours.

--- End quote ---

Hi nctnico,

I have the suspicion that I forgot to configure the external ocxo source correct. So the pll is running infinitely without getting locked.

Cheers Chris

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