Spektrum DX20 User manual

2-Channel, 2-Model Memory
DSM Racing System
®
®

2
Table of
Contents
Alternate Languages............................................................................................... 2
Introduction............................................................................................................ 3
DX2.0 Quick Start Setup......................................................................................... 3
DX2.0 with Digital Spectrum Modulation............................................................... 5
Binding .................................................................................................................. 6
Antenna.................................................................................................................. 7
Direct Trim Access ................................................................................................. 8
Control Identification and Location ........................................................................ 9
System Features................................................................................................... 10
R/C Safety Precautions......................................................................................... 10
Steering Tension Adjustment................................................................................ 10
Receiver Connections and Installation.................................................................. 11
Servo Layout........................................................................................................ 12
Charging Jack...................................................................................................... 12
Key Input and Display .......................................................................................... 12
Display Screens ................................................................................................... 13
Accessing the System Mode ................................................................................ 14
Model Select (System Mode)............................................................................... 15
Model Name Entry (System Mode) ...................................................................... 16
Grip Button C Function Select.............................................................................. 16
Data Reset (System Mode)................................................................................... 17
Accessing the Function Mode.............................................................................. 18
End-Point Adjustment (Function Mode)............................................................... 19
Sub-Trim (Function Mode)................................................................................... 20
Servo Reversing (Function Mode)........................................................................ 21
Accessing the Direct Trim Mode........................................................................... 22
Steering Trim (STC) ............................................................................................. 23
Throttle Trim (THC) .............................................................................................. 24
Grip Lever B: Steering Dual Rate Trim Adjustment STG........................................ 25
Grip Lever A: Brake Endpoint Adjustment BRK Brake Endpoint Adjustment ......... 26
DX2.0 Data Sheet................................................................................................. 27
Warranty and Service Information ........................................................................ 29
FCC Information................................................................................................... 30
ITALIAN: Per la versione italiana di questo manuale vi preghiamo di vistare il sito
www.spektrumrc.com
FRENCH: Pour consulter ce manuel en français, visiter le site www.spektrumrc.com
GERMAN: Zur Ansicht der Bedienunsanleitung in den Deutsch besuchen Sie bitte
www.spektrumrc.com
SPANISH: Para ver este manual en Español entra en www.spektrumrc.com
Alternate
Languages

3
Thank you for purchasing Spectrum’s DX2.0 radio system. The DX2.0 is designed to provide
R/C racers with a bulletproof 2.4GHz spread spectrum radio link. With the DX2.0 DSM
system you’ll no longer have to wait for a frequency clip, worry about radio interference from
noisy motors or ESCs or be concerned that someone may turn on a radio on your channel
causing interference. In addition, the DX2.0’s programming is user-friendly and offers the
most important features and functions that racers demand. It’s important that you carefully
read this manual before attempting to operate your DX2.0 system. For your convenience, a
blank data sheet has been included in the back of this manual. Once you have input all the
necessary data for a particular model, we recommend that you write that information down on
the data sheet provided. This insures that, in the rare case of a memory failure, you will not
lose your models’ setup data.
For those who would like to get out to the track quickly with just the basic radio setup, please
refer to the Quick Start section that follows.
Introduction
Included in this manual are in-depth instructions detailing all the steps and procedures
needed to correctly program each of the DX2.0’s features. Quick Start covers the basic
programming information necessary to get you to the fast track. Later, when you want to learn
more about the specific features of the DX2.0, refer to the appropriate page(s) in this manual
for more detailed programming information.
Binding
It’s necessary to program the receiver to a specific transmitter so that the receiver will only
recognize that transmitter, ignoring signals from any other sources. If the receiver is not
bound to a transmitter, the system will not operate. Also, during the binding process, the
servo fail-safe positions are set.
1. Make sure the transmitter and receiver are turned off.
2. With the receiver off, press and hold the bind button on the receiver while turning on
the receiver.
3. Release the bind button when the LED flashes green.
4. With the transmitter off, place the transmitter steering wheel and the throttle trigger in
their desired fail-safe positions (normally brake and straight ahead steering).
5. Press and hold the bind button on the transmitter while turning on
the transmitter.
6. Release the bind button after the green LED flashes.
After several seconds, the LED on the receiver and the LED on the transmitter will quit
flashing and remain solid, indicating that the binding process was successful. Once binding
is complete, the system will automatically connect.
Note: See page 6 for a detailed description of the binding process.
DX2.0 Quick
Start Setup

4
Servo Reversing
1. With the transmitter power switch on, press the
SCROLL key to enter the Function mode.
2. Press the SCROLL key until “REV.NORM” appears on the screen.
The “ST” indicates the steering servo reversing screen.
3. Press the INCREASE or DECREASE key to move the cursor
to the desired servo direction (REV.NORM).
4. Press the CHANNEL key once to access the throttle servo reversing screen.
5. To select the direction of the throttle servo, repeat Step 3 above.
End-Point (Travel) Adjustment
1. From the Servo Reverse function, press the SCROLL key once to access
the End-Point (Travel) Adjustment function (the EPA screen with “ST” will appear).
Steering Adjustment
2. Rotate the steering wheel in the desired direction (left or right) to be adjusted.
3. Press the INCREASE or DECREASE keys to select the
desired travel value.
Throttle Adjustment
4. Press the CHANNEL key once. TH will appear on the screen.
5. Pull the trigger for forward or push the trigger for brake adjustment.
6. Press the INCREASE or DECREASE keys to select the desired travel value.
DX2.0 Quick
Start Setup
(continued)
SCROLL
ENTER
CHANNEL INCREASE
CLEAR
DECREASE
st
REV • NORM
–
Indicates Current Channel
ST = Steering
TH = Throttle
Indicates Current Servo Direction
Indicates Current Adjustment Position
STR = Steering Right
STL = Steering Left
FWD = Forward Trigger
BRM = Reverse (brake) Trigger
Indicates Current Value
st
100
E P A
–
–

5
The DSM®system operates in the 2.4GHz band (that’s 2400MHz). This high frequency offers
a significant advantage as it’s well out of the range of model-generated radio interference
(like motor and ESC noise). All the complex issues that now exist using 27 and 75MHz
radios with model-generated interfering noise are eliminated with this system. The DSM
system uses Direct Sequencing Spread Spectrum modulation to generate a wide signal on a
single frequency. The FCC requires that these systems be “smart”– incorporating collision
avoidance such that when a system is turned on, it scans the 2.4GHz band and selects a
channel that is not being used, then begins transmitting on that unused channel. 79 channels
are available and the odds of one DSS spread spectrum system interfering with another are
astronomically remote. The 2.4GHz spectrum has a capacity of 79 channels. In the unlikely
event that the spectrum is full, the 80th system will not connect or cause any interference
going into hold scan until a channel is free.
DX2.0 with
Digital
Spectrum
Modulation

6
During the first installation, the receiver(s) must be bound to the transmitter. Binding is
necessary to program the receiver(s) to distinguish its corresponding transmitter from
others. Also fail-safe positions are transferred from the transmitter to the receiver during
binding. See binding below for more details.
It is necessary to bind the receiver to the transmitter during the first installation, and is
recommended when the receiver is moved from one vehicle to another. Receivers can be
re-bound to the same transmitter or to other transmitters an infinite number of times. Also
multiple receivers can be bound to a single transmitter, common when using one transmitter
to operate several models.
Only bound receivers and transmitters can connect. During power-up, the transmitter scans
for a free channel while the receiver scans for its bound transmitter. During the scanning
process, LEDs on both the transmitter and receiver flash rapidly. When control is achieved,
the LED remains on continuously.
In the unlikely event that the link is lost during use, the receiver will drive the servos to
their fail-safe positions that were preset during the binding process. If the receiver is turned
on prior to turning on the transmitter, the receiver will enter the fail-safe mode, driving the
servos to their preset fail-safe position. When the transmitter is turned on, normal control is
resumed.
To bind the receiver to the transmitter
1. Make sure the transmitter and receiver are turned off
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Binding
Bind Button
LED

7
2. With the receiver off, press and hold the bind button on the receiver while turning on
the receiver.
3. Release the bind button when the LED flashes green.
4. With the transmitter off, place the transmitter steering wheel and throttle trigger
channels in their desired fail-safe positions (normally brake and straight-
ahead steering).
5. Press and hold the bind button on the transmitter while turning on
the transmitter.
6. Release the bind button after the green LED flashes.
After several seconds the LED on the receiver and the LED on the transmitter will quit
flashing and remain solid, indicating that the binding process was successful. Once binding
is complete, the system will automatically connect.
Antenna At 8.5 inches in length, the receiver antenna is significantly shorter than conventional
antennas. The receiver has provisions that allow the antenna to exit the top of the receiver
or at the end of the receiver. To switch antenna positions, it is necessary to open the case
to change the antenna exit position. Like all antennas, it’s important to mount the antenna
vertically. In most cases the antenna can be mounted inside the body with no loss of range.
Mount the receiver antenna as recommended by the manufacturer of the vehicle, however, it
may be necessary to trim the plastic antenna tube (included with your vehicle) to allow the
antenna to extend at least 1/2” past the tip of the tube.
Note: If desired, the antenna can be shortened (cut) to exactly 3.6” with negligible loss of
range, and in some applications the short 3.6” length will make installation easier.
Binding
(continued)
LED and
Bind Button

8
Steering and Throttle Trim Adjustment
Steering Servo Trim Adjustment:
1. With the transmitter power switch on, move the digital steering trim lever in the desired
position to be adjusted. The steering trim value screen will appear automatically.
Throttle Servo Trim Adjustment:
2. With the transmitter power switch on, move the digital throttle trim lever in the desired
position to be adjusted. The throttle trim value screen will appear automatically.
Direct Trim
Access
STC
0
THC
0
Steering Trim
Throttle Trim
Indicates Steering
Trim Function
Indicates Current Value
Indicates Throttle
Trim Function
Indicates Current Value
TRIM
TRIM
BRK
50
Brake Function
Indicates Current Value
R/B
E P A
–

Antenna
Power Switch
Adjustable
Steering
Tension
Electronic Digital
Steering Trim Lever
Battery cover *
(8 “AA” Batteries Required
Electronic Digital
Grip Lever B
Electronic Digital
Grip Lever A
Digital Voltage Reading
Three Character
Name Input
Multidata LCD Display
Steering Wheel
Electronic Digital
Throttle Trim Lever Throttle Trigger
Increase Button
Clear Function
Decrease Button
Channel Button
Enter Function
Scroll Button
Grip Button C
9
Control
Identification
and Location
* To remove the Battery Cover, press down where it says “press” and push the cover in the
direction of the arrow. Remove the battery cover and install 8 “AA” batteries in the direction
as molded into the battery case. If the transmitter voltage fails to register, check for correct
battery installation and review voltage again.
Charge Jack

10
For safe and reliable performance of your R/C model, please carefully read and follow these
guidelines:
1. Radio control models are not toys. They are capable of inflicting serious injury to
people and property. Use caution at all times when operating your model.
2. You are responsible for the safe operation of your R/C model. You must properly install,
test and operate your model with a clear sense of that responsibility. Do not take risks
that might endanger yourself or others.
3. Running an R/C car in the streets is very dangerous to both drivers and models. Avoid
running your model in areas occupied by full-size automobiles. To locate areas where
you can safely operate your model, you should contact your local hobby shop for R/C
tracks or clubs in your area.
4. When running an R/C boat, keep it away from any swimmers, full-size boats, or wildlife.
Also, watch carefully for fishing lines that can get tangled in the propeller.
5. If at any time while operaing your RC model you sense abnormal model functioning,
end your operation immediately. Do not operate your model again until you are certain
the problem has been corrected.
CAUTION: Control of your model is impossible without sufficient voltage for the
transmitter and receiver. A weak transmitter battery will decrease your range of
operation and a weak receiver battery will slow servo movement and decrease
your range of operation. Check your receiver pack voltage often to avoid losing control
of your model.
R/C Safety
Precautions
Steering tension is adjustable via the recessed screw located beneath the steering wheel (see
page 9 for exact location). Turning the screw clockwise increases the steering tension.
Steering
Tension
Adjustment
• DSM 2.4GHz Spread Spectrum Modulation
• Two channels
• Easy-to-read LCD graphics display
• Two-model memory
• Three-character model name entry
• Electronic digital trim levers for throttle and steering
• Two assignable electronic grip levers
• Direct display trim function
• Sub-trim
• Steering rate adjustment
• Independent steering endpoint adjustments
• Brake/throttle endpoint adjustment
• Low battery alarm
• Charge jack receptacle (rechargeable batteries not included; order JRPB958)
System
Features

11
Note: When using a separate Ni-Cd receiver as a power source, the operating voltage
range is 4.8–6.0V (4–5 cells) under load.
Attention: Make sure the male and female connectors have the correct polarity (+/–)
before connecting. Be sure to orient the servo plug correctly for proper insertion.
Most electronic speed controllers are set up for B.E.C. (Battery Elimination Circuitry)
operation and plug directly into your receiver. See Figure A for a typical setup and check your
speed controller’s manual for correct installation.
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Figure A – Connections to B.E.C. and receiver with mechanical speed controller. Ni-Cd
battery and speed controller are not included in the radio set.
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Figure B – Connections to B.E.C. and receiver with electronic speed controller. Ni-Cd
battery and speed controller are not included in the radio set.
Receiver
Connections
and
Installation

12
Note: Rubber
grommets (and
sometimes eyelets)
are used in fuel-
powered vehicles.
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Servo Layout
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Key Use
SCROLL Used to move up through the available functions
CHANNEL Used to select the desired channel
INCREASE Used to increase the value of the selected function
DECREASE Used to decrease the value of the selected function
To enter the System Mode press the SCROLL
andCHANNEL keys simultaneously and hold
while turning on the transmitter.
To enter the Function Mode, press the SCROLL
key while the transmitter is on.
Press the INCREASE and DECREASE
keys simultaneously to clear the screen or
return to factory preset.
Key Input and
Display
Located on the left-hand side of the transmitter is the charging jack, which accepts only
JR®or Spektrum®style wall chargers. Please do not attempt to use any other brand of wall
charger as it may be reverse polarity and can cause damage to your system. Only use the JR
or Spektrum type wall charger when the DX2.0 is equipped with Ni-Cd batteries (available
separately, JRPB958).
Spektrum Transmitter Charge Jack Polarity:
n
Charging Jack
Charger Pigtail For Transmitter
Black To Positive
Red To Negative
SCROLL
ENTER
CHANNEL INCREASE
CLEAR
DECREASE

13
Normal Display Screen
When the power switch is turned on, the LCD screen will read as shown below. This screen
is referred to as the Normal Display.
Note: If any of the electronic trim buttons are moved while in this screen, the screen
will automatically change to display the trim in use. This is called the Direct Trim
Mode. For more information on the feature, please see page 8 of this manual.
Low Battery Screen/Lithium Battery Backup
When the voltage of the eight “AA” batteries drops below 9.0 volts, the DX2.0’s display
screen will alternate between the Normal (see above) and Low Battery screen (BAT),
and a continuous beeping will occur, indicating that the batteries need to be replaced
before further use. The Low Battery screen is active during any operating modes.
Lithium Battery
Your DX2.0 radio system is equipped with a five-year lithium battery backup system.
This system is designed to protect and retain all radio programming in the event that
the transmitter batteries drop below the required 9.0 volts, or the transmitter battery case
is removed during battery changes. If after five years it becomes necessary to replace the
lithium battery, return your system to the Horizon Service Center for repair
(see address, page 29).
Memory Backup Screen
If the Memory Backup screen appears, this indicates the possibility of a ROM problem or the
lithium battery is dead. If you switch the power off and on again, and the transmitter is in the
default mode with all data lost, it is strongly suggested that the DX2.0 transmitter be returned
to the Horizon Service Center for servicing (see Warranty Information, page 29).
Display
Screens
MD1
10.2 v
bat
8.9 v
-
-
bak
ER
–
–

14
To enter the System Mode, press both the SCROLL and CHANNEL keys at the same time
while turning on the transmitter power switch. By pressing the SCROLL key, you can now
choose Model Select, Model Name Input, Grip Button C function or the Data Reset function
as shown here on the System Mode flow chart. Information for each function is located on
the page number listed next to the function name on the flow chart.
To exit the System Mode, press the SCROLL and CHANNEL keys at the same time, or
simply turn off the transmitter.
Accessing the
System Mode
MDI
MDL
I
clr
I
Model Select (Page 15)
Date Reset (Page 17)
–
-
-
I
-
-
0
GBC
Model Name Entry (Page 16)
Grip Button C Function (Page 16)

15
Model Select
(System Mode)
The DX2.0 has memory for two models. This feature allows for two different models to be
operated with the same transmitter (additional receivers and servos must be purchased
separately) or one model with two different race setups.
Accessing the Model Select Function
1. Press the SCROLL and CHANNEL keys at the same time and hold.
2. Turn the transmitter power switch on to enter System Mode.
3. If “MDL” does not appear on the screen, press the SCROLL key until MDL appears.
4. Press the INCREASE or DECREASE keys to select the desired model number
(1 or 2).
5. Press the SCROLL key to access the Model Name Entry Function.
6. To exit the System Mode, either turn the transmitter power switch off or press the
SCROLL and CHANNEL keys at the same time.
MDL
I
Model Select Function
-
-
Model Number

16
The DX2.0 allows a three-character name to be input for each of the two (2) models available.
The current model, with name, will then be displayed in the Normal display screen. This
feature is useful to help identify different models, setups, etc. For information on selecting
models 1 or 2, please refer to the Model Select Function (page 15).
Accessing the Model Name Entry Function
To access the Model Name Entry function, follow the steps below:
1. Press the SCROLL and CHANNEL keys at the same time and hold.
2. Turn on the transmitter power switch to enter the System Mode.
3. Press the SCROLL key until “MD1” appears on the screen with the first character
flashing.
4. Press the INCREASE or DECREASE keys to select the correct letter/number for the
first character (flashing).
5. To change the remaining two characters, press the CHANNEL key until the desired
character to be changed is flashing.
6. Press the SCROLL key to access the Grip Button C function.
7. To exit the System Mode, either turn the transmitter power switch off or press the
SCROLL and CHANNEL keys at the same time.
The Grip Button C function of the DX2.0 allows you to activate the Emergency Steering
function. This function allows you to override the steering dual rate giving maximum travel,
which is useful in oval racing. Use the information below to select the correct Grip Button C
assignment for your particular installation.
Accessing the Model Name Entry Function
1. Press the SCROLL and CHANNEL keys at the same time and hold.
2. Turn on the transmitter power switch to enter the System Mode.
3. Press the SCROLL key until “GBC” appears on the screen.
4. Press the INCREASE or DECREASE keys to select the correct Grip Button C function
type to be used.
5. Press the SCROLL key to access the Data Reset function.
6. To exit the System Mode, either turn the transmitter power switch off or press the
SCROLL and CHANNEL keys at the same time.
Model Name
Entry
(System Mode)
MDI
I
-
-
Grip Button C
Function
Select
(System Mode)
Flashing character indicates
the character to be adjusted
Current Model Number
0
GBC
Grip Button C is inhibited
Grip Button C Function
E6
GBC
Emergency Steering Button
is activated

17
The Data Reset function allows you to reset all the programming in the selected model (1 or
2) to the factory default settings. Before using the Data Reset function, it’s important to enter
the Model Select function and check to make sure the current model number indicated (1 or
2) is the model to which you want to reset to the factory default settings. The Model Select
function is described in detail on page 15.
Accessing the Data Reset Function
To access the Data Reset function, follow the steps below:
1. Press the SCROLL and CHANNEL keys at the same time and hold.
2. Turn on the transmitter power switch to enter the System Mode.
3. Press the SCROLL key once until CLR appears on the screen.
4. Press the INCREASE and DECREASE keys at the same time to reset the data. To
confirm that the selected model’s programming has been reset, a beep will sound and
the model number selected (1 or 2) will stop flashing.
5. To exit the System Mode, either turn the transmitter power switch off or press the
SCROLL and CHANNEL keys at the same time.
To enter the Function Mode, it is necessary to first turn on the transmitter's power switch.
Data Reset
(System Mode)
clr
1
Indicates model to be reset
–

18
Next, press the SCROLL key until a beep is heard. The display will change to show the
first function listed on the Function Mode flow chart as shown below. Press the SCROLL
key to scroll down through the functions one by one, as shown in the flow chart. Once the
desired function has been reached, use the CHANNEL key to select the appropriate channel
(if applicable). To adjust the values of the function, simply press the INCREASE (+) or
DECREASE (-) keys until the desired value is displayed on the screen. To exit function
mode, press the SCROLL and CHANNEL keys at the same time. The next time you enter
Function mode, you will be returned to the last function accessed.
The End-Point Adjustment feature of the DX2.0 allows the maximum travel of both the
Accessing
the Function
Mode
Channel
Key
I00
TRIM
stS
–
st
–
I00
E P A
tH
End-Point
Adjustment
(page 19)
Channel
Key
st
REV • NORM
–
–
Channel
Key
0
–
E P A
TRIM
tHS
0
–
st
REV • NORM
–
–
SB-TRM
Sub-Trim
(page 20)
Servo
Reversing
(page 21)
R/BL/F

19
steering and throttle servos to be increased or decreased in each direction to achieve the
exact servo movement needed. The End-Point Adjustment range is from 0% to 125% and
is factory set to 100% for both channels. The value displayed on the screen depends on
the current position of the steering wheel, trigger, or trim lever to be adjusted. This feature
is very useful either to maximize servo travel or to reduce servo over-travel to eliminate
servo binding (servo moves further than control mechanism allows), without the need for
mechanical linkage adjustment. The screens below are accessed by turning the wheel to
the desired direction to be adjusted (left or right), by moving the trigger to the forward or
backward (brake) position, or by moving the Grip Lever A to the forward or back positions.
Accessing the End-Point Adjustment Function
1. Turn on the transmitter power switch
2. Press the SCROLL key to enter Function mode.
3. Press the SCROLL key until “EPA” appears in small letters on the left side of the screen.
4. Press the CHANNEL key to select the desired channel to be adjusted.
Steering = ST R/B (steering right) or ST L/F (steering left)
Throttle = TH L/F (forward) or TH R/B (braking or reverse)
5. Move the steering wheel or trigger in the desired direction for adjustment (left/right,
forward/reverse or brake). Press the INCREASE or DECREASE keys to achieve the
desired amount of travel. Move the wheel or trigger in the opposite direction to adjust
the travel in the opposite direction.
6. Press the SCROLL key to access the Sub-Trim Function.
7. To exit the Function Mode, either turn the transmitter power switch off or press the
SCROLL and CHANNEL keys at the same time.
Note: When setting the end-point adjustment values for the steering function, it is suggested
that, if possible, the maximum travel values be set to an equal value in both directions to
maintain proper steering control.
End-Point
Adjustment
(Function Mode)
L/F
I00
st
–
I00
E P A
tH
E P A
Current Value
Values: 0 to 125
Clear = 100
L/F
Steering Left
End-Point Adj
Current Value
Values: 0 to 125
Clear = 100
Forward Throttle
End-Point Adj
R/B
I00
st
–
I00
E P A
tH
E P A
Current Value
Values: 0 to 125
Clear = 100
R/B
Steering Right
End-Point Adj
Current Value
Values: 0 to 125
Clear = 100
Backward Throttle
(Brake)
End-Point Adj

20
The Sub-Trim function of the DX2.0 is an electronic trimming feature that allows the neutral
position of the servo on either the steering or throttle channel to be moved, while allowing
the electronic trim lever for that channel to remain in the center position. This feature is very
useful, as it allows the servo arm/wheel position to be moved to help with control linkage
installation, eliminating the need to make mechanical linkage adjustments. Although the
Sub-Trim function is a very useful feature, it is suggested that only small amounts of sub-
trim be used so that no unwanted, non-equal servo travel is created. It is suggested that less
than 30 points of Sub-Trim be used during adjustment. If more than 30 points of Sub-Trim
are required, it is suggested that a mechanical linkage adjustment be performed.
Accessing the Sub-Trim Function
1. Turn on the transmitter power switch.
2. Press the SCROLL key to enter the Function Mode.
3. Press the SCROLL key until “TRIM” appears in small letters to the left of the screen.
4. Press the CHANNEL key to select the channel to be adjusted
(Steering, Throttle).
5. Press the INCREASE or DECREASE keys until the proper servo position is achieved.
6. Press the SCROLL key to access the Servo Reversing function.
7. To exit the Function Mode, either turn off the transmitter power switch or press the
SCROLL and CHANNEL keys at the same time.
Sub-Trim
(Function Mode)
Values: R/B 125 0 R/F 125
TRIM
stS
–
0
–
Indicates curent channel:
STS = Steering
THS = Throttle
Indicates current value