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bg7tbl gpsdo master reference

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dekagon:
Hi all,

I am looking for a NEO-M8T config file created with u-blox u-center 22.07 for comparing.
I was foolish not to save mine before I switched the NEO-7M receiver to an NEO-M8T  :palm:
After desoldering the config has been gone (stored in the battery backed ram).

So now I can fiddle out which config I have to set for disciplinig the CTS ocxo (for minimizing more failure sources I put the builtin CTS ocxo back on the circuit board).

Cheers Chris

MIS42N:

--- Quote from: dekagon on August 08, 2023, 06:01:06 pm ---Hi all,

I am looking for a NEO-M8T config file created with u-blox u-center 22.07 for comparing.
I was foolish not to save mine before I switched the NEO-7M receiver to an NEO-M8T  :palm:
After desoldering the config has been gone (stored in the battery backed ram).

So now I can fiddle out which config I have to set for disciplinig the CTS ocxo (for minimizing more failure sources I put the builtin CTS ocxo back on the circuit board).

Cheers Chris

--- End quote ---
I configured a LEA-M8T a while back. I can't remember all the details (I should have written it down) but IIRC u-center 22.07 did not support the M8T (to set up the timing mode required a TIMER2 message, and for unknown reasons that isn't in 22.07). I found V8.29 online, and it worked fine.

There's a lot of things can be changed but I skipped most of it. Using u-center I reset the configuration, enabled some messages, restricted the satellite constellations to GPS and one other (I think Galileo) as recommended by others, ran the survey in for 24 hours, disabled the extra messages just leaving the normal NMEA messages, then saved the whole configuration to permanent memory (otherwise it gets lost on power down). It takes some reading of the u-blox8-M8_ReceiverDescrProtSpec_UBX-13003221-1.pdf document to understand the process, but it's all there.

I know I was confused by the survey in process, so I set it to survey in for a short period to learn about it. IIRC when it completes it doesn't say it has, but automatically goes into timing mode. But the details are a bit hazy now.

Good luck.

dekagon:

--- Quote from: MIS42N on August 09, 2023, 12:39:39 am ---
I configured a LEA-M8T a while back. I can't remember all the details (I should have written it down) but IIRC u-center 22.07 did not support the M8T (to set up the timing mode required a TIMER2 message, and for unknown reasons that isn't in 22.07). I found V8.29 online, and it worked fine.

There's a lot of things can be changed but I skipped most of it. Using u-center I reset the configuration, enabled some messages, restricted the satellite constellations to GPS and one other (I think Galileo) as recommended by others, ran the survey in for 24 hours, disabled the extra messages just leaving the normal NMEA messages, then saved the whole configuration to permanent memory (otherwise it gets lost on power down). It takes some reading of the u-blox8-M8_ReceiverDescrProtSpec_UBX-13003221-1.pdf document to understand the process, but it's all there.

I know I was confused by the survey in process, so I set it to survey in for a short period to learn about it. IIRC when it completes it doesn't say it has, but automatically goes into timing mode. But the details are a bit hazy now.

Good luck.

--- End quote ---

Thank you for your tips. I found the u-center 8.29 on the u-blox download page for u-center. I give it a try. The over 400 pages of the M8 receiver description is hard stuff  :phew:

Cheers Chris

MIS42N:

--- Quote from: dekagon on August 09, 2023, 07:13:03 am ---The over 400 pages of the M8 receiver description is hard stuff  :phew:

--- End quote ---
Once you get the hang of u-center it isn't so hard. You don't need to know the format of every message, and that is over 300 pages. I played around modifying things without storing them in the permanent configuration, not knowing really what I was doing (but learning). A reboot cleared any mistakes and start again. I think 22.07 prompts to say do you want to store this, but 8.29 doesn't and you have to remember in the end that data has to be stored in the permanent config to become permanent. I've seen a few comments "I did this but when I rebooted it went back to how it was".

Hang in there.

Ringmodulator:
The display versions of the BG7TBL GPSDO can display an indication of the accuracy of the 10MHz signal.
It is not clear to me, how the unit determins this

Maybe a calculated result of TDOP?

Is there a way to get this info from a non-display BG7TBL GPSDO, for example via LadayHeather?

Regards
Chris

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