DX4R PRO
4-Channel 2.4GHz DSMR™ System
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Notice
All instructions, warranties and other collateral documents are subject to change at the sole discretion of Horizon Hobby, LLC. For up-to-date product literature, visit horizonhobby.com and click on the support tab for this Product.
Meaning of Special Language
The following terms are used throughout the product literature to indicate various levels of potential harm when operating this product:
NOTICE: Procedures, which if not properly followed, create a possibility of physical property damage AND little or no possibility of injury.
CAUTION: Procedures, which if not properly followed, create the probability of physical property damage AND a possibility of serious injury.
WARNING: Procedures, which if not properly followed, create the probability of property damage, collateral damage and serious injury OR create a high probability of superficial injury.
WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to operate the product correctly can result in damage to the product, personal property and cause serious injury.
This is a sophisticated hobby product. It must be operated with caution and common sense and requires some basic mechanical ability. Failure to operate this product in a safe and responsible manner could result in injury or damage to the product or other property. This product is not intended for use by children without direct adult supervision. Do not attempt disassembly, use with incompatible components or augment product in any way without the approval of Horizon Hobby, LLC. This manual contains instructions for safety, operation and maintenance. It is essential to read and follow all the instructions and warnings in
the manual, prior to assembly, setup or use, in order to operate correctly and avoid damage or serious injury.
WARNING AGAINST COUNTERFEIT PRODUCTS
Always purchase from a Horizon Hobby, LLC authorized dealer to ensure authentic high-quality Spektrum product. Horizon Hobby, LLC disclaims all support and warranty with regards, but not limited to, compatibility and performance of counterfeit products
or products claiming compatibility with DSM or Spektrum.
NOTICE: This product is only intended for use with unmanned, hobby-grade, remote-controlled vehicles and aircraft. Horizon Hobby disclaims all liability outside of the intended purpose and will not provide warranty service related thereto.
Age Recommendation: Not for Children under 14 years. This is not a toy.
Warranty Registration
Visit community.spektrumrc.com today to register your product.
SAFETY PRECAUTIONS
•Always ensure all batteries have been properly charged prior to using the model.
•Always check all servos and their connections prior to each run.
•Never operate your model near spectators, parking areas or any other area that could result in injury to people or damage of property.
•Never operate your model during adverse weather conditions. Poor visibility can cause disorientation and loss of control of your model.
•Never point the transmitter antenna directly toward the model. The radiation pattern from the tip of the antenna is inherently low.
•If at any time during the operation of your model you observe any erratic or abnormal operation, immediately stop operation of your model until the cause of the problem has been ascertained and corrected.
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Spektrum DX4R PRO • transmitter Instruction Manual |
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Table of Contents
Warranty Registration.................................................... |
2 |
Identifying Controls and Switches.................................. |
3 |
Installing Batteries........................................................ |
4 |
ModelMatch................................................................. |
4 |
Charging...................................................................... |
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The Rubber Grip........................................................... |
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Updating the Firmware.................................................. |
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Warning Screens.......................................................... |
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Low Battery Alarm |
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Inactivity Alarm |
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Receiver Compatibility................................................... |
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Main Screen................................................................. |
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Programming Guide...................................................... |
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Individual Direction Adjustments |
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List ............................................................................. |
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Model Select................................................................ |
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Travel........................................................................... |
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Steering Rate............................................................... |
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Exponential ................................................................. |
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Binding...................................................................... |
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Frame Rate................................................................ |
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Servo Speed............................................................... |
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Mixing........................................................................ |
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Active Vehicle Control (AVC)......................................... |
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ABS (Automatic Breaking System or pulse brakes)........ |
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Idle Up....................................................................... |
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Traction...................................................................... |
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Trim Step................................................................... |
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Reset......................................................................... |
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Monitor...................................................................... |
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System ..................................................................... |
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Telemetry................................................................... |
18 |
Changing from Dropdown to Standard Wheel............... |
20 |
Changing to Left-Handed Configuration........................ |
21 |
Troubleshooting Guide................................................ |
21 |
1-Year Limited Warranty.............................................. |
22 |
FCC Information......................................................... |
23 |
IC Information............................................................. |
24 |
Compliance Information for the European Union............ |
24 |
Identifying Controls and Switches
A.Switch A
B.Switch B
C.Switch C
D.Switch D
E.Switch E
F.Switch F
G.Roller Selector
H.Rubber Grip
I.Memory Card Port (under rubber grip)
J.Power Switch
K.Battery Cover
L.Throttle Trigger
M.Steering Wheel
N.Antenna
O.LCD Screen
P.RF LED
N
P
O B
A
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C
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F 
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Slide the power switch (J) |
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to power ON the transmitter. |
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A Spektrum logo screen will |
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will show on the LCD screen (O). |
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Spektrum DX4R PRO • Transmitter Instruction Manual |
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Q.Steering Tension Adjustment Screw
R.Throttle Tension Adjustment Screw
S.Trigger Sizing
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R |
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Steering Tension Adjustment
The steering tension is adjustable using the screw below the steering wheel. Turn the screw clockwise to increase the steering tension.
Throttle Tension Adjustment
The trigger tension is adjustable using the screw in front of the throttle trigger. Turn the screw clockwise to increase the trigger tension.
Installing Batteries
Trigger Sizing
You can adjust the trigger to fit your driving style. To adjust the trigger:
1.Loosen the screw on the back of the trigger.
2.Adjust the trigger spacing as necessary.
3.Tighten the screw on the back of the trigger.
CAUTION: NEVER remove the transmitter batteries while the model is powered on. Loss of model control, damage or injury may occur.
ModelMatch
The Spektrum DX4R PRO transmitter features ModelMatch™ technology, preventing you from operating a vehicle when the wrong model memory is active in the transmitter. If you select the wrong model memory, the receiver will not respond to the transmitter.
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Spektrum DX4R PRO • transmitter Instruction Manual |
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Charging (not available on all transmitters)
Charger Pigtail for Transmitter
BLACK TO POSITIVE
BLACK W/WHITE STRIPE TO NEGATIVE
Spektrum Transmitter Charge Jack Polarity
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+
DX4R PRO transmitters with part numbers that end in E do not have charge jacks.
All Spektrum charge jacks are center pin negative. Before using a charger, use a voltmeter to make sure the connector is center pin negative. When charging, use a charger designed for four cells (4.8-volt battery pack).
Charging Warnings
WARNING: Failure to exercise caution while using this product and comply with the following warnings could result in product malfunction, electrical issues, excessive heat, FIRE, and ultimately injury and property damage.
•Read all safety precautions and literature prior to use of this product.
•Never leave the battery and charger unattended during use.
the Rubber Grip
•Never allow children under 14 years of age to charge battery packs.
•Never attempt to charge dead or damaged batteries.
•Never charge a battery if the cable has been pinched or shorted.
•Never allow batteries or charger to come into contact with moisture at any time.
•Never charge batteries in extremely hot or cold places (recommended between 50–80°F (10–26°C)) or place in direct sunlight.
•Always use only Ni-MH rechargeable batteries. This charger cannot charge batteries such as “heavy duty”, “alkaline”, “mercury” or “lithium” battery.
•Always connect to the charger correctly.
•Always disconnect the battery and charger after charging and let them cool between charges.
•Always inspect the battery before charging.
•Always terminate all processes and contact Horizon Hobby if the product malfunctions.
•Always make sure you know the specifications of the battery to be charged or discharged to ensure it meets the requirements of this charger.
•Always constantly monitor the temperature of the battery pack while charging.
•Always end the charging process if the charger or battery
becomes hot to the touch or starts to change form during the charge process. 
• Always charge in a well-ventilated area.
This transmitter includes 2 sizes of grips. The small-size grip is installed at the factory.
To change the rubber grip
1.Lift the edge of the grip and pull the grip away from the handle.
2.Align the tabs on the new grip with the slots in the handle.
3.Press the grip against the handle.
Updating the Firmware
The DX4R PRO features an SD card reader, enabling you to update the transmitter when firmware updates are available. Register your transmitter at www.SpektrumRC.com
to receive the latest information regarding firmware updates. To install firmware updates on your
DX4R PRO transmitter:
1.Remove the grip from the back of the transmitter handle.
2.Download the latest firmware from www.SpektrumRC.com to an SD card. The transmitter serial number can be found by going to the About screen.
3.Install the SD card in the card reader slot on the DX4R PRO transmitter.
4.Power on the transmitter. A Spektrum logo and an installation bar will appear. Installation is complete when the Main screen appears.
5.Remove the SD card from the card slot on the transmitter.
6.Re-install the rubber grip on the transmitter handle.
Spektrum DX4R PRO • Transmitter Instruction Manual |
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EN
Warning Screens
Low Battery Alarm |
Inactivity Alarm |
An alarm will sound and the voltage will flash on the main screen when the transmitter’s battery power falls below a set limit. This alarm reminds you to stop using the vehicle immediately; power off the transmitter and replace the batteries. Set the low battery limit using the System Screen.
Receiver Compatibility
The alarm reminds you to power off the transmitter and save battery power. If the transmitter is powered on for more than 10 minutes and no control movement is detected, the inactivity alarm will sound. Moving any control stops the alarm.
LED 
Antenna
Aux 2 Port
Aux 1 Port
Throttle Port
Steering Port
Bind/Battery Port
Bind Plug
SR2000 Receiver
Built-in Antenna Tube Mount |
LED |
Antenna |
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Antenna Tube |
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Aux Port
Throttle Port
Steering Port
Bind/Battery Port
The DX4R PRO transmitter is compatible with Spektrum™ DSMR™, DSM®, DSM2®, and Marine surface receivers. The included SR410 DSMR receiver is only compatible with DSMR transmitters.
AVC – Active Vehicle Control
AVC™ technology is the newest Spektrum™ RC innovation from Horizon Hobby. This Spektrum stabilization system adds a whole new level of control to your RC driving experience. AVC technology utilizes sensors to adjust steering and throttle output, providing you with a more stable and controlled driving experience.
NOTICE: You must use digital servos with the SRS4210 receiver. Using analog servos will reduce the performance of the system and may cause analog servos to overheat.
Install the receiver in your vehicle using double-sided foam servo tape. Foam servo tape holds the receiver in place and protects the receiver from vibration. Position the antenna vertically and away from the vehicle in an antenna tube. The SR410 has a coax style antenna. The last 31mm of the antenna is the portion that receives the signal from the transmitter.
NOTICE: Do not cut or bend the antenna or it could become damaged.
Electric Vehicle Installation |
Nitro Vehicle Installation |
EC3 |
EC3 |
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Throttle Servo |
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Battery |
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To Motor |
Steering Servo |
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Electronic
Speed
Control
Receiver
Receiver
Battery
Steering Servo
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Spektrum DX4R PRO • transmitter Instruction Manual |
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Main Screen
The Main Screen displays information about the active model, including the Timer (when activated). To return to the Main Screen at any time, press and hold the Rolling Selector for at least 3 seconds.
A.User Name
B.Name assigned to the Model memory
C.Timers (when activated)
D.Transmitter Battery Voltage
E.Steering Percent
F.Position of Steering (St) trim
G.Position of Throttle (Th) trim
H.Position of Aux 1 trim
I.Position of Aux 2 trim
J.Brake Percent
A
B
C
D
E
F
G
H
I
J
PROgramming Guide
Using the Rolling Selector
Press the Selector to enter a highlighted function.
Roll the Selector to highlight a function or change settings and values when selected.
Press and hold the Selector for more than 3 seconds in any screen to return the display to the List Screen or the Main Screen.
To program, always start with a press on the Selector, then roll, then press, then roll, and so on.
Individual Direction Adjustments
Press Roll
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To Enter, Choose |
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To move between |
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values in an option. |
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Hold
Hold for 3 seconds and release to return to the Main or Telemetry screen.
In some instances, you may find it necessary to independently adjust the control directions; for example, if you want more travel for left steering than right steering, perform the following steps:
1.Scroll to the value you wish to change and press the Rolling Selector.
2.When both directions are selected, move the control (steering or throttle) toward the control direction you wish to change. The selection box moves to the desired direction. You do not need to hold the control in the desired direction.
3.To change the opposite direction, simply move the control in that direction.
4.Press the Rolling Selector to save the selection.
List
The List Screen shows other screens to set programming in
the transmitter. A dark box with a clear symbol or text represents the highlighted selection. The Active Screen name is displayed at the top of the screen. Choosing the arrow will open the next higher screen, such as Main Screen or this List Screen. A small bar shows the relative position of a highlighted screen name
in the List.
Spektrum DX4R PRO • Transmitter Instruction Manual |
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EN
Model Select
Select
Use the Model Select menu to change the model memory, to assign a model name or to copy a model. The DX4R PRO has 50 model memories available.
CAUTION: NEVER change the model in Model Select while operating a model. Changing the model memory interrupts the transmitter signal to the receiver and may cause loss of vehicle control, damage or personal injury.
name
Enables you to name the selected model memory using up to ten characters.
1.Use the roller to select
a Model Name in the List.
2.Select the character you want to change. A list of characters appear.
3.Select the character you want to use.
4.When you are finished naming the model memory, select the arrow to save the name and return to the list.
Copy
The Copy function shares active |
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model memory settings with a |
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selected model memory space. |
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This is useful for saving setups |
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for one model to adjust program- |
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ming for track conditions or |
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model setups. |
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Choosing No returns to the List |
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Screen. Choosing Yes saves the |
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active model settings to the |
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selected model memory. |
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A.Active or source model memory number
B.Destination model memory number
IMPORTANT: When using the Copy function, model information will be permanently overwritten by the active model settings.
Travel
The Travel function supports precise endpoint adjustments in all channels. Travel values range from 0–150% (Default is 100%).
NOTICE: Always check the control directions at the extents of travel to be sure the linkages do not bind. Travel values that are too high will cause binding, which may result in damage to the vehicle.
Channel |
Top |
Bottom |
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Steering |
L (left) |
R (right) |
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Throttle |
B (brake) |
F (forward) |
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Aux 1 |
H (high) |
L (low) |
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Aux 2 |
H (high) |
L (low) |
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Spektrum DX4R PRO • transmitter Instruction Manual |
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