I'm not asking what I should buy (yet). My older siblings were into this(r/c flight) way before me(~10 years ago). I know we have at least 2 four channel with one being very quality back in the day. I was wondering what has changed in terms of radios. Will these not work with the new equipment today?

I'd imagine that some of the nice features the new radios have today would not be working with older technology. Was there a big change in crystal design so that my old radios won't work?

I'll have make and model numbers this weekend....

Thanks,
-Tim G