LAUNCHXL-CC1350: RF Studio, symbol-data rate ratio

1) Correct
2) Symbol rate vs data rate are tied to modulation format. If you use 2-(G)FSK data rate and symbol rate is the same. For 4-(G)FSK each symbol consists of 2 bits => symbol rate is half of bit rate. Preamble/ sync does not affect this relationship.

thank you!

so if I want to have some error correction
I have to implement it by myself? (on Transmiter and on Reciver)
or is there some build in option I can use? (except LLR mode)

Do you think about FEC or DSSS?

FEC.

I saw that there is an option of FEC 1/2 whit DSSS, but I need high data rate. and this mode is not working for me in more then 25Kbits/s.- is there a way to moke it work? some other configuratins that I have to change?

or how can I get FEC whituot DSSS?

We have a patch for a CC1101 compatible FEC we plan to add to the SDK.

We are now working from the RF_studio

Is there a register\s we should overwrite to start FEC error-correction?

As I wrote in my previous answer the FEC is implemented as a patch that is not made public yet.