When you first look at a radio system, you'll see how many channels it has and then what channel it's on. When deciding on a radio, it is important to decide on how many channel functions you want. Most airplanes use four channels. So, you may want to think about the future and what plane you want next, and buy a radio that will control all anticipated functions. No license is needed to operate these radios.
Many fields have a frequency control system.
Before you use your radio, be sure you understand the system and are using it correctly. A radio wave of any frequency can have different signal types. To remedy this, transmitters have servo reversing switches. Just flip this switch and everything moves the right way. ATV limits the amount of total servo movement.