JR X9303 2.4

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TRANSMITTER MANUFACTURER JR DISTRIBUTOR Horizon Hobby Distributors MODEL X9303 2.4 TYPE Aircraft ENCODER 9-channel computer system RF MODULE Fully integrated 2.4GHz FREQUENCY BAND 2.400 to 2.483GHz MODULATION Digital Spectrum Modulation (DSM) with Direct Sequence Spread Spectrum SERVO-CHANNEL RESOLUTION 1024 w/4X over-sampling SPECTRAL CAPACITY 40 systems POWER SOURCE 1500mAh 9.6V NiMH RECEIVER MODEL JR921 2.4 TYPE DSM2 DuaLink NO. OF CHANNELS 9 FREQUENCY 2.4GHz RECEIVER VOLTAGE RANGE 3.5 to 9V DC WEIGHT 0.53 oz. (15g) SYSTEM PRICE $730 (w/4 high-torque digital 821 servos) JR X9303 2.4 THE X9303 2.4 HAS THE SAME GREAT FEATURES AS THE 9-CHANNEL, 30-MODEL MEMORY, 3-MODEL XP3903 RADIO SYSTEM AUGUST 2007 93
RADIOREVIEW JR X9303 2.4 The main screen on the X9303 2.4 is very easy to read. Navigation and adjustment of the radio’s various menus is made easy with the unique roller selector switch to the right of the screen. • Flap system (3-position with elevator compensation and delay) • Snap-roll system (with 4 directions and rates) • Gyro system (3 gains for up to 2 gyros) • Servo-speed adjustment (in both directions) • Programmable mixers (6 total; 2 with multipoint adjustment) • Direct servo control (DSC) MAIN DISPLAY There’s very little confusion while navigating the transmitter’s many program menus. The main display shows the current model type (with a graphic symbol) the trim positions, the battery voltage, the model number and the model’s name if you input that information. The function screen is where you find menus for dual rates/expo, servo-reversing, subtrim, servo-travel adjustment, elevator-toflap and aileron-to-rudder mixing, throttle curves, flap system, servo speed, snap roll, servo-speed adjustment and programmable mixers 1 through 6. You also find the trainer, timer and servo monitor menus. In the system menus (press the enter button and turn on the radio), you find the model select, model name, type select, model memory reset, data transfer, trim step function, device (switch) selection and wing-type menus. The navigation and adjustment of these program functions is well detailed in my XP9303 review, and the process is easy and intuitive. MODELMATCH This feature puts an end to the “wrong model 94 MODELAIRPLANENEWS.COM syndrome” if you neglect to double-check that you have the correct model name on the transmitter display before you fly your model. A unique code embedded in the signal, will prevent the receiver from responding if the wrong model’s name is on the transmitter’s screen. SERVOSYNC This new feature actually re-sequences data the transmitter transmits based on the type of mixing you select. So, if you use dual elevators on a giant model or a 3-servo CCPM setup for X9303 2.4 FEATURES The X9303 2.4 has aircraft, sailplane and helicopter software menus. Here are the basic aircraft program features: ■ Switch assignment ■ Flight modes (3 aircraft, 5 sailplane, 6 helicopter) ■ Dual rates for aileron, rudder and elevator (3 with flight modes) ■ Adjustable flight trims ■ Fail-safe (with hold and predetermined servo positioning) ■ Trainer system (selectable channels) ■ Timers (stopwatch, countdown and integrated) ■ Servo monitor ■ ModelMatch ■ ServoSync ■ Model memory transfer system ■ Model copy system your helicopter, ServoSync ensures that the servos that work together will receive their impulses together. This allows the servo movements to be more synchronized for improved response. RECEIVER The JR R921 2.4 is a full-range receiver featuring DuaLink technology and is actually two receivers that each has its own set of antennas. When powered up, the receiver scans the 2.4GHz band to find the transmitter it has been programmed to recognize, and it locks on to its signal. The second receiver circuit then repeats the process and locks on to a second signal to establish a dual-signal link to the transmitter. The two antennas virtually eliminate blocked-signal interference from nearby metal objects such as big glow- and gas-powered models and large battery packs. As with all 2.4GHz radio systems, the transmitter signal beam is line-of-sight, so always avoid flying behind large buildings or objects that could block the signal. Binding. Binding programs the receiver to recognize your transmitter, and it’s done at the factory. Binding or rebinding is necessary if you purchase another receiver to use with your transmitter and if you want to change the built-in throttle-smart fail-safe settings. Smart fail-safe. This built-in feature is set so that if there is a signal loss, the throttle will go to a low setting, and the other control channels will remain in their last positions. If you turn on the receiver before the transmitter, all the channels go to their fail-safe positions (set during the binding process), but as a safety feature, the throttle channel does not produce a signal pulse, so it can’t activate an electric model’s ESC. The instruction manual explains the binding and fail-safe setting processes in detail. BOTTOM LINE The JR X9303 2.4 is a user-friendly radio system that’s ideally suited to intermediate to expert fliers. I especially like the fact that with its transfer system, you can easily bring all your XP9303 model memories into the X9303 2.4. This is a real time saver. Add the frequency freedom of DSM 2.4GHz frequency modulation and the ability to link to all older Spektrum receivers, and you have a radio system that’s ideal types of RC flying. See the Source Guide for manufacturers’ contact information.
Page 1: RADIOREVIEW BY GERRY YARRISH PHOTOS

JR X9303 2.4

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