[ZED-F9P] RTK floating fix stops working after few minutes

[SunboX]

Hey,

I’m receiving RTCM3 correction data using a TTGO T-CALL that works very stable. I’m providing the correction data to the ZED-F9P using I2C (also tried Uart2 - same behavior).

When I send the correction data to the F9P, it goes into RTK floating fix after few seconds. The accuracy jumps from round about 1.50m to 0.60m. it more or less stays there for some minutes (sometimes it goes down to 0.30m - bit no final fix). But than, after some minutes, it goes straight back to “RTK no fix” and accuracy of 1.XXm. that happens for I2C and Serial connection. Type doesn’t matter. The GSM is still connected and the incoming RTCM3 “looks” valid.

What can go wrong? Is there some way how I can debug it? Is this somehow a known behavior?

Greetings and thanks,

André

[SunboX]

Hi,

I put all on a soldering breadboard now and also added 2.2k resistors to the I2C SDA and SCL lines and 3.3V. I checked it with my oscilloscope and the signal looks better now (less noise + more squary like). But still the same issue, the floating fix stops after some seconds / minute(s) … but I still get a valid correction signal and I’m still transmitting it to the receiver.

So, question again … how can I debug this? Or what can cause this issue?

greetings and thanks,

André