Okeydoke, thanks for the replies

One more noob question... Could you use a transmitter built for 2.4GHz or other frequency and put a 40MHz crystal in it? Would it work or not...?

And since this is a build diary: I've nearly completed the robot, after buying a few parts and scavenging bits of plastic etc, I'm not sure yet whether to have a wedge or shovel or otherwise on the front yet :wink: