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The rc cars amplifiers used in radio circuits, are responsible for carrying the signal until it can be captured about 1.5 km without distortion. This is sometimes used 2 or 3 RF amplifier stages once the signal was generated in the oscillator.
Single amplifier circuits are responsible for raising the output power of said transmitter and only to a level appropriate for several reasons. An amplifier is the stage that consumes more power, while we want more power out of batteries would have less time, so we must find a balance.
The amplifier must be as linear as possible to avoid the generation of harmonics and cause interference to other receivers nearby. Linear we mean that absolutely should not introduce a deformation in the amplified signal.
Receiver
A receiver is generically speaking, the element that receives the information coming from the transmitter through a given medium. In our case the medium is air and the communication is established via radio waves. The receiver does is virtually the reverse process that made him the signal transmitter.
Moreover, the entire rc cars productivity will depend on the maintenance. You need to be aware about any strange noise. The signal enters the receiver antenna, with the information for the servos, but as is so cannot be used because the frequency is too high to be used directly to Demodulator r / c. Then the receiver is responsible for obtaining the same waveform that we had at first modulator in the rc in the transmitting equipment. To do this internally with these steps:
- Generic outline of a simple conversion receiver
- Schematic of a double conversion receiver but you need to learn details.
Requirements of rc cars receivers
They must be sensitive to detect the signal even when the receiver is away from the transmitter, but not much to avoid being affected by electromagnetic noise.
You must have selectivity to proper discernment between the signal and noise, this feature is very easy to achieve because they always use quartz crystals in the circuit along with filters, selectivity besides providing a very good noise rejection.
It must be stable in frequency. This is also achieved through the use of quartz crystals, as these are extremely stable. Where we should be careful is in the external components such as capacitors and resistors, as well as the battery voltage. But these rc cars factors are not relevant to worry about!
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