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The control base radio control cars radio signal is the signal that will allow us to then modulate an RF signal at the next stage in either FM or AM and the most popular methods are PPM and PCM, PPM being the most used commercially for their price / product.
In the projects published here on e-radio PPM or PWM was chosen for the base signal given the relative simplicity with respect to PCM.
PCM was noted above that emerged for solving some problems that became apparent with the use of PPM. Both have advantages and disadvantages.
PPM advantages and disadvantages
This is a PPM-based signal or PWM. In most cases you will notice that 7 channels are transmitted, and time sync everything in a frame of 20ms, with respect to the maximum amount of channels that can transmit this signal is 10 channels for a total 30 ms, the frame should never be greater than 30ms because then the rebuild to understand the radio control cars servo.
The above signal has a high state with less duration than the lower states, whereas the second signal, is more durable high states it is as if one was the "negative" of the other, and these two signals are both valid for the transmission of PPM since everything depends on the receiver in charge of decoding the other side. Some circuits use one and some use the other, both have the same advantages and disadvantages except it the second signal transmitter consumes more battery power because it spends more time in the high state than the other.
An advantage is its easy implementation can name in electronics, i.e. to achieve radio control cars signals of this type is very easy due to the simplicity of nature then it becomes a cost. Another advantage is the effective bandwidth in the transmission, since only 3 KHz with good separation and filters can make the interference is eliminated almost entirely.
A disadvantage can say it is easy to interfere and cause errors in the interpretation of the data when the signal becomes a little weaker. The servos can be damaged before misinterpreted pulses or too long or too short. According to this type of modulation that was developed by Futaba, it may help to improve the problem of radio control cars interference and quality of interpretation by the recipient. It involves sending encrypted information to the receiver.
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