Radio Control System of RC model

The radio control system consists of two elements, the transmitter you hold in your hand and the receiver placed inside the model. The model launcher will greatly simplify the operation, it will read your joystick input and send it to the receiver in real-time over the air. When the receiver receives this information, it will pass it to your model controller to make the model move accordingly. The radio will have four separate channels in each direction on the joystick, with additional channels on any auxiliary switches it may have.

Frequency and channel

Fortunately, radio controls arranged by frequency and channel are much smarter and easier to manage than their FPV counter parts. For example, both video transmitters and receivers need to set the correct channel and perform diligent channel management on each flight. However, the radio controller only needs to be bound or paired with the receiver when it is first set up.

Since then, it will always link and skip various frequencies in the 2.4Ghz band to ensure a strong link with hundreds of pilots operating theoretically simultaneously.

1.When we press the control button, the transmitter sends a certain number of electrical pulses through the air. The transmitter has its own power supply, usually in the form of a 9-volt battery. Without the battery, the transmitter will not be able to send radio waves to the receiver.
2.After the remote control toy receives the radio wave, the motor will start, which will cause a specific action. The power supply supplies power to all working parts, including the motor. The transmitter is controlled by radio waves, and the receiver starts the motor. When we press the button on the transmitter to move the RC toy forward or backward, we touch a pair of electrical contacts. The receiver recognizes the signal and sends it to the circuit.
 Of course, if it is a nitro car, the receiver also needs a battery, some of which are lithium batteries, but the commonly used is the NiMH battery pack with AA cell battery connected in series. This depends on the specific situation
3.The circuit board converts the number of electrical pulses (signals) into actions. The full-featured controller has six controls that work in the following pulse sequence:

 

1. Forward: 16 pulses
2. Reverse: 40 pulses
3. Leftward: 28 pulses
4. Right direction: 34 pulses
5. Leftward: 52 pulses
6. Reverse right: 46 pulses

 

Comparability and communication protocols

Different radios speak their own language to talk to the receiver, some of which are faster, while others are more reliable and even smaller / cheaper. This means you must use a receiver that is compatible with your transmitter, which is most likely made by the same company.

After the receiver receives the signal, it needs to communicate it to the flight controller. Different radios have different protocols for this, so make sure your flight controller and software support it. Communication speed is very important because if it is too slow, it may cause system delay

Some standard protocols include

PWM-This is your classic analog signal, each channel has a separate wire. This is slow and angry now and should be avoided if possible

PPM- This is a slightly improved version of PWM, in which all channels are sent on a line through a series of timing pulses. This is faster than PWM, but still not the best choice.

Digital protocols (SBUS, IBUS, DSM2 / X)-Digital signals no longer depend on the timing of different pulse widths, but instead send numbers in the form of 1 and 0, providing perfect accuracy and faster response times.

For the speed and precision required to fly a mini quad-core, you should always try digital protocols, the variants depend on your radio manufacturer.

 

Telemetry

Some quads can actually talk back to relay important information, such as battery voltage and signal strength. This information can be displayed on the screen or audibly read out via the remote control to warn you when to land or when you are out of range. The audible sound is great for you because you can focus on flying and you won't miss any warnings that could cause you to crash or lose your limbs.