They are still listed in the tamil channel group. on LCN 127..
channel placement does make a difference.. the quality of the channel changes once its moved to different location, not sure of the technical side of it ,as i really dont know if uhf and vhf band is still used in digital. as of now rajmusic raj news and imayam are placed in some odd location where it will not be in the sequnce of the tamil channel. vijay tv location is undisturbed as such in digital. only time can answer if it will be there or moved out.