Is there a way I could generate rds by using the fm transmitter app and then feed it to my driver board?

Either that or tune it 10.7mhz below the transmission signal or maybe even on the transmitter frequency???? I’m not sure.

My aim is to use a raspberry pi zero as standard as a link. It can’t create rds unless I add a dac card. But then it will use a lot of resources to create the rds signal.

Guess that's not possible - you need to generate a clean 57Khz carrier - and need a minimum samplerate of 120Khz to generate this.
There is a guy who generates an FM signal with stereo and RDS on the GPIO - but this signal is dirty

https://circuitdigest.com/microcontroll ... ransmitter

https://github.com/ChristopheJacquet/PiFmRds

Yes, you can only generate RDS using the standard board by running the fm transmitter through the gpio. I wondered if there was some way to then feed this signal into a exciter board (like band 1). Because the rds would still be there.