[Discuss-gnuradio] about RDS and FM transmission

[Rafael Diniz]

Hi people,
I'm a volunteer of a free radio here in my city (Campinas), and looking at
CGRAN I found a RDS receiver/transmiter:
https://www.cgran.org/wiki/RDS

Can I modulate only the RDS data using this gnuradio software and then,
inside the FM transmitter, between the exciter and the power amp mix the
RDS signal together w/ the FM signal?
They have to be at the same power level to be mixed, right?

Do anyone have any experience w/ that?
What daughterboad to use (FM band)?

Thanks in advance,
Rafael Diniz