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It is a little difficult to know exactly about the quality of the rc car transmission because it uses standby sending small data packets. Also the delays that occur in the warning signs cause some problems. Control problems when the signal is interrupted completely grow incrementally learns the pilot until the fall of the model results.
Considerations for a base signal generator
A base rc car signal must try to achieve the following objectives:
Encode the position of a potentiometer in periods of time.
RF stage or radio transmitter quality. In the RF stage of the base signal is coming to be high in order of frequency of the order of KHz MHz, this is done in order to be transmitted to the receiver.
AM Transmitter
This is a signal of great amplitude. A 4 channel is transmitted in a basic engine. In the last graph shows the transmitted signal as amplitude modulated air, in this case with 100% modulation, i.e. acts as a carrier signal can be interrupted as a train presence sequential and absence of RF. This waveform (R / C AM modulated at 100%) is the same as a CW transmission better known as Radio Telegraphy.
The same waveform is then that we find if we look after the RF amplifier in the receiver control.
FM Transmitter
This is the waveform of R / C FM. It is worth noting that FM rc car transmission has some advantages over the broadcast on AM, they are:
§ The output circuits have higher performance because you'll waste no harmonic power as it does in AM.
§ At the transmitter circuits are generated simplest FM.
§ When it comes to the receiver, it is very simple to avoid interference, AM is "very" susceptible noise.
Most commercial equipment may advertise specific items; yet, many modelers are choosing FM or PCM combined with PPM for their products.
Advantages of PCM
When focusing on other options, you may notice plenty of benefits. For instance, in the case of PCM, you get a higher precision servo position and movement without interruption, even if the model is too far. When kept in a good position, the servo pulses shorter during maintenance (Hold). In this case, move the servo to the position you want even during a momentary interruption of the signal or even during a failure of the transmitter (safe mode). Transmissions SPCM20 fast if used or PCM 1024, similar to PPM signal. The rc car servos are not damaged if the pulses are too short or too long, as can happen with PPM.
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