PhilD
Forgive me for asking, but why do you want your wife to work on the radios? I don't know what you fly but I find it one of the most satisfying parts of flying.
I'm sure it's not the case, but if you are concerned (as I once was) about using it efficiently, email me and I can give you the one sure way of quickly getting it right without having to be worried again.
If on the other hand you just can't be a***d to talk to anyone then I apologise for my suggestion and I take my hat off to you!!!!!!