RTK FIX problem PX1122R new board

[ESPrtk]

fazm from AGO forum :
I am using the GNSS PX1122R old version and the new version (ESP32).

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I can see GPS, GLONASS, BEIDOU, GALILEO satellites in my area.

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For BS RTK I use an antenna similar to this 2J7C01MC2F L1L2

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[ESPrtk]

For rover an antenna like this 2J6901BC2F - L1L2 is used.

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PX1122R old version is configured in RTK base mode, and rover is configured by default.

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When I disable SBAS and QZSS satellites on BS RTK, my rover goes into float RTK state, and cannot reach fix RTK.
The fix RTK state is reached when enabling all satellites.

How can I reduce the number of RTCM messages to reduce the load on the NTRIP server?

[Andrew Hsu]

Hi,

After my test, when Base disable SBAS,QZSS or rejoin SBAS, QZSS, it will reboot, the rover drops from rtk fix to normal gnss fix or float, then the rover needs to take some time to re-resolve ambiguity, in my case around 60 seconds (survey mode with survey length = 60 seconds) to regain RTK fix. It can remain RTK fix after regain RTK fix.

Below, picture, the left is Rover, the right is Base, Base TX wired to Rover RX.

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Your receptions of L2 on the rover receiver is not good, no L2 actually for RTK.

Did you do a cold start on the Rover after the base disable SBAS and QZSS at runtime? Was the rover able to get RTK fix? though, in my test, I did not do a cold start.

Best regards,

Andrew