Transmission of RTCM data via radio

[ramsie838]

Subject of the issue

I use example 3 from the library: Example3_StartRTCMBase I want to send the RTCM data to a rover via a radio module at 433Mhz. The radio module is connected to the Arduino Uno R3 via SPI. The maximum amount of data that can be sent over the radio module is 61 bytes per transmission. I use the CC1101 module and this library: simonmonk/CC1101_arduino. The rover never goes into the mode: "High precision float fix!" or into the mode: "High precision fix!".

Your workbench

• I am using an Arduino Uno R3
• GPS RTK2
• Connections base:
  The I2C port of the GPS RTK2 is connected to the Arduino Uno R3 via Qwiic cable. For the transmission of the RTCM data I use the UART2 port of the GPS RTK2 Module. The UART2 port (TX) is connected via cable to the UART port RX of the Arduino.

Connections Rover:
The I2C port of the GPS RTK2 is connected to the Arduino Uno R3 via Qwiic cable. For the transmission of the RTCM data I use the UART2 port of the GPS RTK2 Module.. The UART2 port (RX) is connected via cable to the UART port TX of the Arduino.

• How is everything being powered? over USB

Steps to reproduce

To reproduce the problem, I have attached the code in a zip file.

rover_data_receive.zip
startRTCMBase_.zip

Expected behavior

The rover should go into RTK mode using the RTCM data.

Actual behavior

The rover never goes into RTK mode.

I've been sitting on this problem for a while. I don't want to waste anyone's time, but I'm at a loss.

[PaulZC]

Hi @ramsie838 ,
The best place to ask for advice about RTCM radio links is the GPS forum:
https://forum.sparkfun.com/viewforum.php?f=116
Things to check:
61 bytes is a very small packet size for RTCM data. Are you sure that your radio modules can handle the full RTCM data rate? (It sounds like this could be you biggest problem.)
Instead of an SPI radio module, why not use one that accepts serial data. Then you can feed RTCM serial data from the UART2 port direct to your base radio module. At the rover end, connect another radio module to the UART2 port on your rover.
Try using jumper links to connect the UART2 ports on your base and rover to each other. If the rover goes into RTK mode then you know that your radio link is the problem.
I am closing this as it is not an issue with the library.
Best wishes,
Paul