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About Radio Equipments |
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MANUFACTURER: Wonder Hobby
CATEGORY: RC Airplanes
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| Wonder Hobby |
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Wonder Hobby |
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Information:
RC Airplane Radio Systems Aircraft radio systems consist of a transmitter (or controller), a receiver, one or more servos, and batteries. Servos are the part of the airborne radio system that convey mechanical movement. Each moving part will need a servo to make that part move. Radio systems are available with a wide variety of features. However, they all share similar quality and basic functions. When you first look at a radio system, you'll see how many channels it has and then what channel it's on. The word channel is used two different ways: firstly, an airplane radio is very often a 4-channel radio. This means that it controls four functions on the plane (ailerons, elevator, rudder, throttle); secondly, it refers to the actualradio frequency the radio transmits. There are several frequencies legal to use for R/C airplanes and each one has been assigned a channel number. When deciding on a radio, it is important to decide on how many channel functions you want. Most airplanes use four channels. However, some aerobatic, scale, and sport planes use five or six channels (adding flaps and retractable landing gear). So, you may want to think about the future and what plane you want next, and buy a radio that will control all anticipated functions. Frequencies The FCC has set aside 50 frequencies in the 72 MHz band (channels 11-60) dedicated to aircraft use only. No license is needed to operate these radios. However, if you have an amateur (ham) radio operator's license you may be able to use a radio in the 50 MHz band. Also, there are six frequencies set aside in the 27 MHz band that are legal for any kind of model use (surface or air). Just remember, whatever channel your radio is on, check the field where you fly for any other radios on the same channel and do not use your radio when theirs are on! Many fields have a frequency control system. Before you use your radio, be sure you understand the system and are using it correctly. AM vs FM / PCM vs PPM This refers to the signal type (or modulation). A radio wave of any frequency can have different signal types. * PPM (pulse proportional modulation) is usually an analog system. This is very precise (but not digitized). This equipment is more economical than PCM. * PCM (pulse code modulation) signals are digitized and provide the most accurate signal. A dedicated computer in the transmitter and receiver actually use binary code (pulses) in the signal. * AM signals are always PPM. AM is more subject to interference than FM and does not allow for the use of a "Buddy" cord. * FM signals are either PPM or PCM. Usually, only pilots flying competitively in precision aerobatics or scale use PCM. Control Features The following features can be found on many economically priced 4 and 6 channel units: Servo Reversing Due to servo rotation and control linkages, control inputs can end up reversed (i.e. moving the transmitter stick to the right, viewed from behind
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