Radio direct cars terminology and grandiose system facts

The radio control cars system PCM (Pulse Code Modulation) is digital, and has been used for nearly 30 years in telecommunication systems and digital audio.

When analyzing radio control cars system, the CRC (Cyclic Redundancy Code) is extremely important, because the security is the amass system, is the checksum obtained performs a mathematical operation gone all the binary words sent to the receiver. In this suit the beneficiary is not dumb, but it next has a microprocessor that receives the frame, it performs the thesame mathematical operation that compares the sender and the CRC checksum been obtained. If both assent that means that the received signal is genuine in this conflict is used all word in the phrase to generate a digital pulse width modifiable that is sent to the corresponding servo.

If the checksum traditional does not come to an understanding the normal CRC that means the signal has been corrupted by the quirk because of interference in this engagement is nevertheless sent to the servos the last valid signal received. If the interference is rushed (which is usually did not call glitch nor will we realize that we had, because the adjacent frame that arrives will be true and sent to the servos. If the interference is long-lasting (i.e. because someone turned on a radio in our thesame frequency, or even because we have spent the battery of the transmitter) can program the beneficiary to continue sending the last real signal, or we can pick to schedule a "fail safe".

This is expected to bring the radio run cars servo to a predetermined position, in the combat of a car engine is cut, in the war of a plane is usually left the engine idling and give a positive response control surfaces to the point. It is a magnificent procedure. The advantages are obvious, but there are plus disadvantages. The most important of this analysis is the delay. The frames that are much longer send the trains of pulses that are sent in the radio rule cars PPM system, in view of that the system is slower, and in some disciplines "adrenaline" is you may pronouncement the put off between the command sent and the tribute of the model.

Each radio govern cars manufacturer is looking for ways to minimize this problem, for example, there are codes in the PCM frame in an absolute incline sent even channels and uncommon contrast, and the bordering frame to send exchange pairs and odd absolute position. In this showing off they get "scrape" milliseconds to create the system faster, although it is currently impossible to accomplish the keenness of wave of the PPM.