Products > Test Equipment
bg7tbl gpsdo master reference
MIS42N:
--- Quote from: mojoe on February 11, 2024, 06:22:47 am ---
I understand what most of the text means. Are the satellite signal levels (dBc) good? I'm going through a passive splitter with my HP timing antenna. I understand what the graph in the upper right is. I'm not so sure what the graph at the bottom is showing me. I did turn on ADEV.
If I understand things, after the survey is done, I can turn off SBAS, then do an EE to write the surveyed position back to the u-blox GPS. Then I may want to increase the elevation mask and save that.
Any words of wisdom or enlightenment about any of this is appreciated.
--- End quote ---
In my experience, signal levels over 35 dB are good. If there are reflected signals it can cause a problem, the elevation mask can help there. Only if your antenna is in a poor position. If you get a survey in less than a metre then it's not a worry.
I think, but someone will know better, that when survey in completes the GPS module writes the data to memory itself and enters timing mode automatically. I did it a year or two ago and that might be my faulty memory.
mojoe:
--- Quote from: MIS42N on February 12, 2024, 02:14:59 am ---In my experience, signal levels over 35 dB are good. If there are reflected signals it can cause a problem, the elevation mask can help there. Only if your antenna is in a poor position. If you get a survey in less than a metre then it's not a worry.
I think, but someone will know better, that when survey in completes the GPS module writes the data to memory itself and enters timing mode automatically. I did it a year or two ago and that might be my faulty memory.
--- End quote ---
Yes, that would be if I had the GPS do a self survey. I opted to let LH do a survey, as it says it will be more precise.
mojoe:
--- Quote from: FPSychotic on February 11, 2024, 10:34:01 pm --- The problem is that even reading the sats, it doesn't read the config, firmware version, or anything and I can change nothing, all the gnss tab boxes appears detached, the firmware empty...any idea of why this behaviour?
Maybe my cable is wrong and I should buy a commercial one?
--- End quote ---
That's weird. Perhaps it is your cable. You're obviously receiving data. Maybe you aren't transmitting to the GPS. When you use u-center, it sends commands to put the GPS in ubx mode.
My GPSDO is configured to NMEA mode on power up (I assume all the different revisions are). u-center should be receiving the NMEA data, which is why you're seeing satellites.
The cable needs to be straignt through. I initially used a cable made with ribbon cable and IDC connectors.
mojoe:
Looking at the LH display (below), the GPS module is obviously reporting sawtooth corrections (the numbers change every second). Is there any way to tell if the GPSDO itself is using this to actually make the corrections to the PPS?
FPSychotic:
I did the cable myself with a connector and two cables to the ftdi, can be seen in the picture. Maybe I need ground too.
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