Remote Control Gear required for your drone
Its always a good idea to have a manual backup system for your system in-case something goes wrong, or you set a way-point that is heading straight for a tree or other obstacle. Also with some of the more basic stabilisation systems you will need to control your drone with a radio transmitter.
If you are already into Remote Control aircraft/ cars you will probably already know what a transmitter is, and you will probably already have one. The transmitter is what is used to control your aircraft. In the case of an aircraft, you will move the joysticks on the transmitter, a signal will then be sent to your receiver, which will then instruct your servos to move the control surfaces to turn your plane, or instruct your motor to speed up or slow down. If you are using an autopilot, you dont technically need a transmitter since the autopilot automatically sends instructions to your aircraft on what to do. But its always a good idea to have a transmitter as backup.
There are many transmitters on the market to choose from. The higher the number of channels, the better because it allows you to use more functions and control more servos. Anything above 6 channels is good for use with your drone, but more channels usually mean you can control more functions like controlling a camera, or deploying landing gear or a parachute
Mode 1 or Mode 2?
Refers to the stick configuration of the radio control sticks. Mode 2 is
Mode 1 has the aileron/throttle on the right stick and the rudder/elevator on the left.
Mode 2 ihas the elevator/aileron on the right stick and the rudder/throttle on the left. Most Radios use Mode 2 as this is the most popular
Important Factors when choosing
The most common is 2.4Ghz, this gives a very reliable link that is robust to interference. Since 90% of today's radios operate on the 2.4Ghz frequency this is what you should use. Other radios that operate on FM frequency are ideal if you want to use the 2.4Ghz band for video or telemetry, however they are more prone to interference if other pilots nearby are also on the same band. These radios also tend to be much more expensive.AM: Stands for Amplitude Modulation which transmits by a variation in the amplitude of signals, it is subject to interference more than FM.
FM: Stands for Frequency Modulation which transmits signals by variations in frequency, reduces the risk of "glitches" due to signal interference.
PCM: Stands for Pulse Code Modulation uses binary code to digitize the signal, providing the most accurate signal possible.
2.4GHz: Simply by pushing a button, you link the receiver to a single transmitter -- each 2.4GHz transmitter has been assigned a unique ID code at the factory. Once that link is set, the receiver responds only to that one transmitter. In addition, the 2.4GHz systems never stay on a single frequency for more than two milliseconds. You never have to worry about signal conflicts, and never need to wait for an open frequency
What about the receiver?
When you purchase a RC set, you will most likely get a receiver included. This receiver will need to be binded, or paired with your transmitter and is usually a very easy process by simply turning on your transmitter, and pressing a button on your receiver.
You will connect your servos and motors to your receiver if not using an autopilot. If you are using an autopilot you will then connect your receiver with your autopilot inputs