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Besides an obvious rc helicopter frequency compatibility, meaning that we must design the receiver so you can listen to the transmitter, for this to happen we must say that often to listen, or define what is the transmission channel.
To meet the objectives named above, the selectivity and sensitivity usually opt for a simple conversion super heterodyne circuit or dual conversion. This is regardless of whether it is an AM or FM receiver.
Single and double conversion
As noted above in the diagrams for circuit modules used as recipients had two very different conversion receivers single or double conversion.
Apparently more rc helicopter receivers are used that blend the signal from the antenna with one that is generated locally, the two are mixed and there is obtained from the subtraction of both. This process is called heterodyning is a very efficient method to convert the signal frequency down without losing the valuable information that leads can filter noise, put up for the next stage in the receiving equipment.
A simple conversion receiver simply does is to mix the input signal with a single local oscillator is usually above the 455 KHz frequency of the transmitter. The subtraction of the two frequencies results in a parameter called Intermediate Frequency or IF. This FI is still the same information (ideally) that had the mark when it left the transmitter.
Simple conversion receivers have a big problem, is called image frequency. This image is more often the result of having leaked the 455KHz, ie the output of the IF filter I have the information that comes from the true frequency and a frequency difference of 455KHz to true, the two entering the same side and interference is if someone transmits on that frequency image. The solution for this is to use another frequency conversion to definitely give a good image to the frequency attenuation. As shown in the figure the first 10.7MHz IF is 455 KHz and the second.
The receiving rc helicopter equipment may be more expensive and of higher quality using a third conversion, to ensure a maximum quality of reception of the true frequency, i.e. selectivity and sensitivity as well. There is no need to feel frustrated with complex systems. There is always a solution for every model.
The top rc helicopter is at your hands, you can find the best solutions. The more you seek, the better it is. The right solution is waiting for you.
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