marikamarika:
I am currently working on a project assignment, a radio that can do voice and data communication in VHF. I am already done with the voice but still have no any idea about the data.
What was your solution for voice communications? Do I understand correctly you want to use the same physical transmitter to send data? At least one problem is that 433 MHz is not a voice band so there are legality issues in doing what you seem to propose.
For my project, I want it to be multiple channel of bandwidth in one radio for the data communication, like handy talkie but the frequencies will be limited and allocated into different channels. Is it possible to do it with arduino? If it's possible, can you give me any ideas on what modules or hardware to use for my project? My knowledge about arduino and RF is not that broad yet so please help me out.
It might be helpful if you described what you want to do with the various channels. In particular if you're just sending multiple data types or sending unique data to one of multiple receivers, there may be better ways to do this.
If you truly need multiple RF channels at 433 MHz, the HC-12 transceivers are tuneable.