My plan is to add SCA-FM and RDS content to my existing radio stations, but the problem is that adding RCA and SCA content is difficult than just encoding a stereo signal. There are not too many kits out there for these 2 types of content. Ramsey Electronics would not even come out with decent FM stereo kits or even other kit makers that generate a RDS and a SCA signal. The only 1 kit that I know, but it’s very expensive called the North Country Radio FM 88 that can have stereo signal and a SCA signal, but there is no generator included. I also found out that these Chinese imported transmitters called Hilly does not have RDS or SCA capabilities. I wish someone could direct me to sources for SCA generator circuits and RDS encoder circuits.