I'm a (guess you would call it) reborn RC model aircrafter and I have a question about a couple of old radios I have. They are both Futabas and one is a FP-T2L and the other is a FP-T4L. My question is: How do I determine if they are AM or FM as they have no indication on the units?
As an aside, I just came back from visiting my half-brother in Florida and whilst there he gave me a Futaba FP-4NBF which I am sure is an FM because it is printed on the transmitter.