does anybody know if you can use a nintendo or sega RF switch with a PC engine or not?
You don't have composite cables? I've used NES RF units with the TG16. Not sure if it will work the same way with the Engine. IF you have a converter, just try it. If it works, great. If not, try a different channel. If it still doesn't work, start hunting?
A normal automatic RF switchbox should work fine with an original PC Engine so long as you set the TV to either channel 95 or 96.