Horizon Hobby Spektrum DX3R User manual

© 2009 Horizon Hobby, Inc.
4105 Fieldstone Road
Champaign, Illinois 61822
[phone]
Horizon Hobby UK
Units 1-4 Ployters Rd
Staple Tye
Harlow, Essex
CM18 7NS
United Kingdom
Horizon Hobby Deutschland GmbH
Hamburger Strasse 10
25335 Elmshorn
Germany
horizonhobby.com
US patent number 7, 391, 320
Multiple Patents Pending
DSM and DSM2 are trademarks or registered trademarks of Horizon Hobby, Inc. The Spektrum
trademark is used with permission of Bachmann Industries, Inc. Spektrum radios and accessories are
exclusively available from Horizon Hobby, Inc.
Futaba is a registered trademark of Futaba Denshi Kogyo Kabushiki Kaisha Corporation of Japan.
11065.3Revised 7/09
®

2SPEKTRUM DX3R USER GUIDE 3SPEKTRUM DX3R USER GUIDE
IntroductIon
Spektrum’s DX3R was designed by top level racers
to be the ultimate uncompromising racing radio.
Featuring DSM2™2.4GHz technology, the DX3R
offers the fastest possible response rate that’s up to
four times faster than conventional 75 and 27MHz
radio systems. Sophisticated software combined with
an easy-to-use one-touch rolling selector makes
programming quick and easy. User-programmable
switches and buttons allow functions like throttle trim,
steering rate, auxiliary channel functions, brakes,
timers, steering rate override, and even throttle and
steering exponential adjustments to be assigned to
any of six programmable switch/button positions.
Plus the DX3R can easily be converted for right- or
left-handed drivers.
Spektrum™technology offers a bulletproof radio
link that’s immune to internal (noisy motors/ESC’s,
etc.) and external interfering sources. No longer
will you have to wait for a frequency or worry about
someone else being on the same channel. With
Spektrum, when you’re ready to race there’s nothing
stopping you!
table of contents
Introduction ....................................................................................................................................3
ModelMatch/Binding ......................................................................................................................4
System Features..............................................................................................................................4
Installing the Batteries.....................................................................................................................5
Charging.........................................................................................................................................5
Identifying Buttons, Switches and Controls.....................................................................................6
Steering Tension Adjustment ..........................................................................................................7
Binding ...........................................................................................................................................7
ModelMatch....................................................................................................................................7
Failsafe ...........................................................................................................................................7
Calibration ......................................................................................................................................7
Binding a Receiver ..........................................................................................................................8
Receiver Compatibility ....................................................................................................................8
Receiver Connection and Installation ..............................................................................................9
Receiver Power System Requirements ............................................................................................9
Recommended Power System Test Guidelines................................................................................9
Changing to Left-Handed Configuration .......................................................................................10
Using the Rolling Selector ............................................................................................................12
Main Screen..................................................................................................................................13
List................................................................................................................................................13
Model ...........................................................................................................................................14
Model Select.................................................................................................................................14
Model Name .................................................................................................................................15
Model Copy ..................................................................................................................................16
Travel ............................................................................................................................................17
Steering Rate.................................................................................................................................18
Exponential ...................................................................................................................................19
Reverse .........................................................................................................................................20
Sub Trim .......................................................................................................................................20
Timer.............................................................................................................................................21
Bind ..............................................................................................................................................22
ModelMatch..................................................................................................................................22
Failsafe .........................................................................................................................................23
Frame Rate....................................................................................................................................24
Mixing ..........................................................................................................................................25
Trim Step.......................................................................................................................................25
Reset.............................................................................................................................................26
Monitor.........................................................................................................................................28
System..........................................................................................................................................28
Switch Select ................................................................................................................................29
User Name ....................................................................................................................................29
RF Mode .......................................................................................................................................29
General Notes ...............................................................................................................................30
Tips on Using Spektrum 2.4GHz...................................................................................................30
Warranty and User Information .....................................................................................................31
FCC Information ...........................................................................................................................34
CE Compliance Information for the European Union.....................................................................35
Declaration of Conformity .............................................................................................................35

4SPEKTRUM DX3R USER GUIDE
5SPEKTRUM DX3R USER GUIDE
InstallIng the batterIes
The transmitter requires 4 AA batteries. Brand name
alkaline batteries provide over 15 hours of run time.
Many racers prefer alkaline batteries over rechargeable
batteries, finding it more convenient to simply replace
the batteries when depleted rather than taking the time
to recharge.
Optional NiMH 1.2-volt AA rechargeable batteries
(SPM9525) can also be used. A charge jack located
below the on/off switch is provided for convenient
recharging with Spektrum’s charger SPM9526.
Remove the battery door and install 4 AA batteries,
noting that the polarity of each corresponds with
the diagram in the battery holder. Replace the
battery door.
chargIng
Charger Pigtail for Transmitter
Spektrum Transmitter Charge Jack Polarity
BLACK TO POSITIVE
BLACK W/WHITE STRIPE TO NEGATIVE
-+
ModelMatch/bIndIng
The DX3R features patent pending ModelMatch™.
ModelMatch prevents a model from being operated
using the wrong model memory. If the wrong model
memory is selected, the receiver simply won’t respond
to the transmitter preventing driving the car using the
wrong model memory.
It’s necessary to program the receiver to a specific
model memory (called binding) so that the receiver
will only recognize and respond to that specific model
memory. See pages 22–23 for specific details on
Binding and ModelMatch.
systeM features
• DSM22.4GHzsecond-generationtechnologyoffers
the fastest possible response rate
• One-touch,easy-to-useprogramming
• Sixassignableswitchesallowfunctionsliketimers,
on-the-fly expo adjustment, throttle and brake
trimmers, steering rate, steering override, etc. to be
freely assigned to your preference
• Right-andleft-handcompatible
• ProgrammableSteeringRateoverride
• On-the-ythrottleandsteeringexponential
adjustments
• Allswitchescanbeprogrammedtooperateineither
direction
• Threeprogrammabletimers:Up,DownandIntegrated
• 128x64high-resolutiondot-matrixscreen
• 30-modelmemory
• GraphicallysupportedTravelAdjustandExpocurves
• Selectableframeratesof5.5,11and16.5msallow
fastest possible response with total servo compatibility
• Twoprogrammablemixes
• Adjustabletrimsteps
• Digitalservomonitordisplaysgraphicanddigital
servo positions
• Displaysusernameandmodelname
• Calibrationscreenallowsrecalibrationofsteeringand
throttle positions for the ultimate in accuracy
A charging jack is located just below the on/off
switch. If rechargeable batteries are used, they can
be conveniently charged without removing them from
the transmitter using the charge jack. Use Spektrum’s
charger (SPM9526) to charge rechargeable batteries
in the DX3R.
IMPORTANT:AllSpektrumchargejacksarecenter
pin negative. This is the opposite of many chargers.
Before using a charger, make sure the connector
is center pin negative. This can be done using a
voltmeter. Also, unlike conventional radio systems that
use eight cells to power the transmitter, the DX3R uses
four cells. This is due to the electronics being more
efficient. When charging, be sure to use a charger
designed for four cells (4.8-volt battery pack). Many
racers simply make a harness and use the same
charger used to charge their car packs but turn the
current rate down to 1 to 2 amps.
WARNING: Charge only rechargeable batteries.
Non-rechargeable batteries may burst causing injury
to persons and/or damage to property, and they may
cause fire. Dry location use only.

7SPEKTRUM DX3R USER GUIDE
6SPEKTRUM DX3R USER GUIDE
IdentIfyIng buttons, swItches and controls
1
2
3
4
14
13
5
6
7
8
9
15
10
11
12
1: Antenna 2: LCDScreen 3: SwitchD/SteeringTrim
4: SwitchE/Brake 5: ButtonF/Timer 6: ChargeJack
7: SwitchA/ThrottleTrim 8: SwitchB/SteeringTrim 9: SwitchC/Aux3Linear
10: RollingSelector 11: BatteryDoor 12: On/OffSwitch
13: ThrottleTrigger 14: SteeringWheel 15: SteeringTensionAdjustment
Note:Theswitcheslistedabovearethefactory
default functions assigned to each switch.
Each switch can be programmed to one of ten
functionsincluding:
• Inhibit
• Aux3-channel,3-position(forreverse,neutraland
forward transmissions)
• Aux3-channel,2-position(forreverseandforward
transmissions)
• Aux3-channel,linear(formixturecontrol)
• Brake(adjustablefullbrakeposition)
• Throttleexponential(allowson-the-ythrottle
expo adjustments)
• Throttletrim(coastbrakeposition)
• Steeringoverride(overridessteeringrate
when activated)
• Steeringexponential(allowson-the-y
steering adjustments)
• SteeringRate
• SteeringTrim
See page 28 for system information and assignments
for more details.
steerIng tensIon adjustMent
Steering tension is adjusted via the recessed
screw located below the steering wheel (see
Steering Tension Adjustment on the previous page).
Using a small Phillips screwdriver, turning the
screw clockwise increases steering tension while
turning the screw counterclockwise reduces
steering tension.
bIndIng
In order to operate, the receiver must be bound to the
transmitter. Binding is the process of teaching the
receiver the specific transmitter’s code called GUID
(Globally Unique Identifier). When a receiver is bound
to a transmitter/model memory, the receiver will only
respond to that specific transmitter/model memory
(see ModelMatch).
ModelMatch
The DX3R features patent pending ModelMatch
technology that prevents operating a model using the
wrong model memory. During the binding process,
the receiver actually stores the code that is assigned
to the specific model that is currently selected in the
transmitter.Forexample:ifthemodelthatisselected
in the transmitter is model #3, when a receiver is
bound to that transmitter, the receiver will only operate
when model #3 is selected. If another model memory
is selected (model #5 for example) the receiver will
not connect. If model #3 is again selected in the
transmitter, the receiver bound to model #3 will
connect. ModelMatch prevents operating a model
using the wrong model memory.
faIlsafe
Failsafe positions are also set during binding. In the
unlikely event that the radio link is lost during use, the
receiver will drive the servos to their preprogrammed
failsafe positions (normally full brakes and straight
steering). If the receiver is turned on prior to turning
on the transmitter, the receiver will enter the failsafe
mode, driving the servos to their preset failsafe
positions. When the transmitter is turned on, normal
control is resumed. Failsafe servo positions are set
during binding (see binding a receiver below).
calIbratIon
The DX3R can be recalibrated to ensure the
potentiometers exactly correlate with the software
providing the ultimate in accuracy. Instructions on
calibrating the radio are on page 26; however, note
that if calibration is not properly done the radio will
not function. If after calibration the steering or throttle
does not function properly (the travel is reduced or
no servo travel) it will be necessary to recalibrate the
transmitter.

8SPEKTRUM DX3R USER GUIDE
9SPEKTRUM DX3R USER GUIDE
Note:TheSR3000HRS(model#SPM1202)
receiver is designed to be used with Spektrum’s
Futaba HRS compatible module system only and
is not compatible with the DX3R.
Note: Marine compatible DX3R transmitters can
be identified by the following logo located on the
back of the transmitter.
receIver connectIon and
InstallatIon
Typical Electric Installation
7.2V Battery To Motor
Electronic
Speed Control
Receiver
Servo
SR3100
2.4GHzDSM²
+
−
Typical Gas Installation
Battery
Switch
Servos
Receiver
SR3100
DSM
AUX THR STR BAT/TEL
2.4GHzDSM²
+
−
receIver Power systeM
requIreMents
Inadequate or intermittent power to the receiver that
is unable to provide the necessary minimum voltage
during operation is the number one cause of control
failures with Spektrum systems. Some of the power
system components that affect the ability to properly
deliveradequatepowerinclude:
•Receiverbatterypack(numberofcells,battery
construction quality, connector and state of charge)
bIndIng a receIver
Note:TheSR3100operatesinDSM2modeand
is compatible with transmitters that utilize DSM2
protocol.
1. With the receiver off, insert the bind plug into the Batt/
Bind port in the receiver.
2. Power up the receiver. If using an electronic speed
controller the lead should be plugged into the throttle
port and the switch turned on. If a receiver battery pack
is used, plug the battery lead into any open port noting
the polarity.
3. Turn on the transmitter and make sure the transmitter is
in the desired model number that you intend to use.
4. Press the rolling selector to access the List screen.
5. Rotate the roller to highlight the Bind screen and press
the roller to access this screen.
Us er Na me
01 : Mod el 0 1
Bin d
BIND
Pla c e t h e R X
int o b i n d
mod e f i r s t .
≤
6. Rotate the roller to highlight BIND.
7. With the steering wheel, throttle stick and Aux channel
(if applicable) in the desired preset failsafe positions,
press the roller to initiate the bind process and to store
the failsafe positions. BIND will flash for a few seconds
•TheESC’scapabilitytodelivercurrenttothereceiverand
servos in electric vehicles
•Theswitchharness,batteryleads,servoleads,regulators
etc.
All Spektrum receivers have a minimum operational
voltage of 3.5 volts. If the voltage drops below 3.5
volts, the system will cease control until power is
regained.
recoMMended Power systeM
test guIdelInes
If a questionable power system is being used (e.g.
small or old battery, ESC that may not have a BEC
that will support the servo’s current draw, etc.), it is
recommended that a voltmeter be used to perform the
following test.
Plug the voltmeter into an open channel port in the
receiver and with the system on, load the servos
(apply pressure with your hand) while monitoring
the voltage at the receiver. The voltage should remain
above 4.8 volts even when all servos are loaded.
For gas vehicles, tap and twist the Rx battery pack
while watching the voltmeter. Some battery packs
have poorly welded tabs that give only intermittent
power. Such a defect will show up during shock
and vibration, so this test will verify that the battery
construction is good.
tyPIcal range
Your system’s range can vary greatly due to your
installation and the environment. In most cases you
should be able to have full control of your vehicle to
the limits of sight (about 300 ft with a 1/10-scale car).
If range issues exist your installation can be optimized
by extending the receiver’s antenna as vertically as
possible locating it as high in the vehicle as practical
and also by routing the antenna away from any
onboard electronics.
then the transmitter will beep, indicating the process is
complete. The LED on the receiver should now be solid,
indicating a successful bind has taken place.
8. Remove the bind plug and store it in a
convenient place.
Note:Theonlytimeit’snecessarytodoarebind
is if different failsafe positions are desired or if
the receiver is to be bound to a different model
memory.
Note:SomeSpektrumreceiversliketheSR3000
use a bind button rather than a bind plug. The
binding process is the same with this receiver;
however, instead of inserting the plug before
powering up the receiver, press and hold the
bind button while powering up the receiver to
enter bind mode.
receIver coMPatIbIlIty
The DX3R features DSM2 technology but is also
compatible with Spektrum DSM surface receivers and
Spektrum Marine receivers. When the fastest response
rate is desired, using the system with a DSM2 receiver
like the SR3100 is recommended as this combination
gives the lowest possible latency/quickest response
rate. During the binding process the transmitter
actually “learns” the receiver type (DSM, DSM2 or
Marine) and configures itself to transmit that protocol.
coMPatIble sPektruM receIvers
DSM2
SR3100- 3-channel DSM2 Pro - SPMSR3100
SR3520- 3-channel DSM2 Micro Pro - SPMSR3520
DSM
SR3000- 3-channel Standard - SPM1200
SR3001- 3-channel Pro-Model - SPM1205
SR3500- 3-channel Micro Race - SPM1210
SR300- 3-channel Sport - SPMSR300
SR3300T- 3-channel with Telemetry - SPMSR3300T
Marine
MR3000 - Marine Receiver - SPMMR3000

10 SPEKTRUM DX3R USER GUIDE
11SPEKTRUM DX3R USER GUIDE
changIng to left-handed
confIguratIon
The DX3R is shipped set up for right-handed use but
can easily be switched to a left-handed configuration.
All the parts necessary to convert to left-handed,
including the grip plates, the back cover and the front
shell, are included. A 3/32-inch hex wrench and a
small Phillips screwdriver will be needed.
1. Remove the batteries from the transmitter. This
prevents the possibility of accidentally causing a
short during the conversion.
2. Carefully remove the grip cover by prying
with your fingers at the forward edge of the
rubber grip.
3. Using a 3/32-inch hex wrench, remove the three
screws on the front of the steering housing
as shown.
4. Carefully remove the steering mechanism
and unplug the steering connector. Also
remove the backplate.
5. Using a small Phillips screwdriver, remove the
four Phillips screws (two per side) that fasten the
grip plates in place and remove the grip plate that
doesn’t have the buttons attached.
6. Carefully pull out the grip plate that contains
buttons D, E and F. Using a Phillips screwdriver
remove the PC board and backplate from the grip
plate. Note the positions of the three buttons.
7. Transfer the three buttons (D,E and F) to the other
“handed” grip plate noting that the buttons fit in
a specific direction so that they fit the external
contour of the grip plate.
8. Carefully screw the PC board and backplate
in place and test that all buttons are
depressing properly.
9. Place both grip plates in place and fasten them
using four Phillips screws (two per side).
10. Push the steering wheel connector through the
transmitter case to the opposite side.
11. Select the opposite “handed” steering shell and
pass the steering wheel mechanism connector
through the hole in the shell.

12 SPEKTRUM DX3R USER GUIDE
13SPEKTRUM DX3R USER GUIDE
12. Connect the steering wheel mechanism connector
to the connector from the transmitter being sure the
connection is tight. Note correct polarity.
13. Fit the other handed backplate in place and secure
the steering wheel assembly in place using the
three long cap head screws.
14. Fit the grip in place and reinstall the batteries.
Note that the buttons D and E now work in reverse.
It will be necessary to change the direction of
these switches in the System menu (see page 28).
usIng the rollIng selector
The Rolling Selector is pressed to access functions
and rolled to select specific features or to change
settings or values. Pressing and holding the rolling
selector for more than three seconds returns the
display to the main screen.
The DX3R features one-touch programming
utilizing a Rolling Selector. The Rolling Selector
has three functions.
1:PressingtheRollingSelector-entersthe
selected function
2:RollingtheRollingSelector-highlightsfunctionsor
changes settings and values when selected.
3:Pressingandholdingtherollingselectorformore
than 3 seconds from any screen - returns the display
to the Main Screen.
Programming is very intuitive and always starts
with a press, then a roll, then a press, roll and
so on. Most find that within a few minutes they’re able
to easily program their car without reading
the instructions. However, to realize the full benefit
of the programming, it’s recommended that the
manual be read.
Most racers find it’s most convenient to use their
thumb when making programming changes, as
this allows for one-handed programming, even
allowing the car to be run in one hand while making
programming adjustments in the other.
Note:Eachindividualpagefromthispoint
is dedicated to a single specific programming
function.
MaIn screen
Racer X
01: Losi Eight
Int 1:47:30
Dn Tmr 05:00
S/R 75%
4.7 volts
Trim
St
Th
BR
-12
+0
+104
1
2
3
4
5
6
7
8
9
The information displayed on the screen is as follows.
1:TimerA 5: BrakeTrim
2:TimerB 6: SteeringRate
3:SteeringTrim 7: UserName
4:ThrottleTrim 8: Modelnumberandname
9:Transmitter(Tx)voltage(ashesandalarmsoundswhen
low battery is reached)
The main screen displays pertinent information
about the selected model like trim and steering rate
positions, timers, the model selected, battery voltage,
etc. It’s recommended that during driving/racing the
main screen be displayed.
to access the MaIn screen
Any time the transmitter is turned on the main screen
will appear.
From the List screen, the first function at the top of
the List screen is Main. Using the roller, highlight the
Main function and press the roller to access the Main
screen.
From any screen, pressing and holding the roller for
more than three seconds will return the display to the
Main screen.
Note:Whenthebatteryvoltagedropsbelowthe
preset value in the System function (preset to
4.0 volts), an alarm will sound and the voltage
reading will flash.
lIst
Lis t
Mo d el
Tr a vel
St e er Rat e
Ex p onen tial
Re v erse
Su b T rim
Ti m er
Bi n d
Fr a me Rat e
Ma i n
The List screen displays all the available
functions. The desired function can be accessed
by highlighting it using the roller. When highlighted,
press the roller to enter the function.
to access the lIst screen
From the main screen, pressing the roller will access
the List screen.
From any other screen, an arrow is located at the
top of each of the programming screens. This is a
back arrow and highlighting this arrow with the roller
and then pressing the roller will return the List screen.

14 SPEKTRUM DX3R USER GUIDE
15SPEKTRUM DX3R USER GUIDE
Model select
01 : Mod el 0 1
Mod el
Se lec t:
Na me:
Mo del 0 1
◊
Co py To :
02 : Mod el 0 2
≤
to access the
Model select functIon
In the Model screen use the roller to highlight
the Select function. A box will surround the
Select function.
Press the roller to access the Select function.
The box will now be flashing, indicating the
Select function is active.
Use the roller to select the desired model memory
(models 01 thru 30).
To return to the Main screen, press and hold the roller
for more than three seconds.
Model
01 : Mod el 0 1
Mod el
Se lec t:
Na me:
Mo del 0 1
◊
Co py To :
02 : Mod el 0 2
≤
TheModelscreenoffersthreefunctions:
ModelSelect: Allowstheselectionofoneofthirty
model memories. This allows you to
store and select up to thirty models.
ModelName: Allowstheselectedmodeltobegiven
a name with up to ten characters.
ModelCopy: Allowsamodelmemorytobecopied
internally to a different model memory
(e.g. model one (01) can be copied to
model thirty (30)).
Model naMe
Mod el
Nam e
Na me:
Mo del 0 1
◊
≤
to access the
Model naMe functIon
In the Model screen, use the roller to highlight
the Name function. A box will surround the Select
function.
Press the roller to access the Name function. The
above screen will appear.
Use the roller to select the desired model name
character position by placing the cursor below the
desired position.
Press the roller to access that character or number;
then use the roller to change to the desired letter or
number.
Pressing the roller will allow the cursor to be
repositioned to the next field.
To return to the Main screen, press and hold the roller
for more than three seconds. You can also use the
roller to select the back arrow.

16 SPEKTRUM DX3R USER GUIDE
17SPEKTRUM DX3R USER GUIDE
Model coPy
01 : Mod el 0 1
Mod el
Se lec t:
Na me:
Mo del 0 1
◊
Co py To :
02 : Mod el 0 2
≤
to access the
Model coPy functIon
In the Model screen use the roller to highlight
the Copy To function. A box will surround the
Copy To function.
Press the roller to access the Copy To function.
The box will now be flashing, indicating the Copy To
function has been selected.
Use the roller to select the desired model that you
choose to copy to (models 01 thru 30).
When the desired model that you intend to copy to is
selected, press the roller. The screen will appear as
follows.
Con fir m
Co p y
01 : Mode l 0 1
to
02 : Mode l 0 2
NO
YE S
≤
If the selected model is correct, use the roller to
highlight YES and press the roller to copy from the
current model to the selected model.
Note:Themodelmemoryoftheselectedmodel
will be replaced with the current model’s model
memory, thus erasing the copy to the model’s
memory.
To return to the Main screen, press and hold the roller
for more than three seconds.
travel
Us er Na me
01 : Mod el 0 1
L 10 0%
R 10 0%
H 10 0%
L 10 0%
H 10 0%
L 10 0%
ST
TH
AX
Tra vel
≤
The Travel screen (sometimes referred to as travel
adjust or endpoints) allows independent travel
adjustment of the servo throw in each direction of
all three channels (steering, throttle and auxiliary). A
graphic illustration displays the effect of travel adjust.
to access the travel functIon
From the list screen rotate the roller to highlight the
Travel function.
Press the roller to enter the Travel function. The Travel
screen will be displayed as shown above.
Rotate the roller to highlight the desired channel that
you wish to adjust the travel of.
ST= Steering
TH= Throttle and brake
AX= Auxiliary channel 3
Press the roller to enter the highlighted channel’s
travel function (see monitor Page 28).
01 : Mod el 0 1
St eer in g
10 0% 10 0%
Tra vel
≤
Rotate the roller to highlight the values at the
bottom of the screen; then press the roller to
select the values.
Rotating the roller will now adjust both the right and
left values simultaneously. If you desire to adjust
the right or left directions independently, then move
the corresponding channel’s wheel, throttle stick or
trigger. The trimmer that the Aux channel is assigned
to and that value alone will be highlighted (e.g.
turning the steering wheel to the right will highlight
the right value only and subsequent adjustment will
affect the right travel only).
Note:TheDX3Rfeatures“stickygooey.”
When the corresponding channel is moved
in the desired position as illustrated above
and released, the value on that side remains
highlighted. Moving the channel in the opposite
direction will then highlight the opposite
direction’s value. This allows convenient
independent travel adjustments without having to
hold the wheel or trigger in the desired position.
To highlight both values again after moving the
wheel in one direction, simply press the roller
once with the wheel centered and both values
will be highlighted.

18 SPEKTRUM DX3R USER GUIDE
19SPEKTRUM DX3R USER GUIDE
steerIng rate
01 : Mod el 0 1
Ste er Ra te
Us er Na me
S/ R
10 0%
S/ R Ove rr ide
IN HIB IT
≤
Steering rate (also known as dual rate) allows on-the-
fly steering travel adjustments to be made using any of
the programmable grip trimmers (A,B,C,D, or E). The
Steering Rate screen also offers a Steering override
function that allows a second steering rate (normally
100%) to be accessed at the touch of a button or
trimmer. This is especially helpful for oval racers
that program minimal steering throw to desensitize
steering during racing but require maximum steering
angle to drive out of a crash or get turned around on
the track. The user name, model number and model
name are also displayed in this screen.
to access the
steerIng rate functIon
In the List screen use the roller to highlight the
Steering Rate function.
Press the roller to access the Steering Rate function.
The above screen will appear.
Use the roller to select the S/R function or the S/R
Override function by placing the box around the
desired function.
Press the roller to access S/R or S/R Override;
then use the roller to change to the desired
Steering rate value.
To return to the main screen press and hold the roller
for more than three seconds.
Note:AnadjustableS/Rratecanbeassigned
to any of the trimmers (A,B,C,D and E) and is
defaulted to trimmer D. This trimmer works in
unison with the S/R Rate screen and the value
can be adjusted from either the screen or from
the programmable trimmer. If it’s desired to
not have an on-the-fly adjustable Steering Rate
the S/R trimmer can be inhibited. See System
function under switch selection on page 29 for
more details.
Note:InorderfortheS/ROverridetooperate
it must be assigned to a switch or trimmer. The
default position for this function is inhibited. To
activate the S/R rate, it’s necessary to program
this function to the desired switch or trimmer in
the System function screen under Switch. See
page 28.
exPonentIal
Us er Na me
01 : Mod el 0 1
L 0%
R 0%
H 0%
L 0%
H 0%
L 0%
ST
TH
AX
Exp o
≤
Exponential is used to affect the response rate
of the steering, throttle and/or brake. Typically positive
Exponential is used for steering, reducing steering
sensitivity around neutral and making it easier to
drive the car at high speeds in a straight line. But
exponential still allows for the maximum turning
radius.
The DX3R’s Exponential function (Expo for short)
allows independent Expo values in each direction
of all three channels (steering, throttle and
auxiliary). A graphic illustration displays the effect
of exponential adjustment.
to access the
exPonentIal functIon
From the List screen rotate the roller to highlight the
Exponential function.
Press the roller to enter the Exponential function. The
Expo screen will be displayed as shown above.
Rotate the roller to highlight the desired channel that
you wish to adjust the travel of.
ST= Steering
TH= Throttle and brake
AX= Auxiliary channel 3
Press the roller to enter the highlighted channel’s Expo
function.
01 : Mod el 0 1
St eer in g
0% 0 %
Exp o
≤
Rotate the roller to highlight the values at the
bottom of the screen; then press the roller to
select the values.
Rotating the roller will now adjust both the right and
left values simultaneously. To adjust the right or left
Expo values independently, move the corresponding
channel’s wheel, throttle stick or trigger the trimmer
that the Aux channel is assigned to, and that value
alone will be highlighted. For example turning the
steering wheel to the right will highlight the right value
only and subsequent adjustment will affect the right
travel only.
Note:PositiveandnegativeExpovaluesare
available. A positive Expo value results in the
center being less sensitive (desirable most of
the time) while a negative value increases the
sensitivity around center (normally not used).
Note:TheDX3Rfeatures“stickygooey.”
When the corresponding channel is moved
in the desired direction (as illustrated above)
and released, the value on that side remains
highlighted. Moving the channel in the opposite
direction will then highlight the opposite value
direction. This allows convenient independent
exponential adjustments without having to hold
the wheel or stick in the desired position. To
highlight both values again after moving the
wheel in one direction, simply press the roller
once with the trigger centered and both values
will be highlighted.

20 SPEKTRUM DX3R USER GUIDE
21SPEKTRUM DX3R USER GUIDE
reverse
Us er Na me
01 : Mod el 0 1
ST
TH
AX
Rev ers e
REV N O R
≤
The Reverse function (also known as servo reverse)
establishes the servo’s direction relative to the
channel’s input (e.g. a right steering input should
result in a right steering angle at the car). Reverse
is available on all three channels and is normally
the first function that is checked and adjusted
during programming.
The user name, model number and model name are
also displayed in this screen.
to access the reverse functIon
In the List screen use the roller to highlight the
Reverse function.
Press the roller to access the Reverse function. The
above screen will appear.
Use the roller to select the desired channel that you
wish to reverse.
ST=Steering
TH=Throttle
AX= Auxiliary
Press the roller to highlight that channel and the
surrounding box will flash; then use the roller to
change to the desired servo direction (REV or NOR).
To return to the Main screen, press and hold the roller
for more than three seconds.
sub trIM
Us er Na me
01 : Mod el 0 1
ST 0
TH 0
AX 0
Sub T rim
≤
The Sub Trim function is normally used to correct for
minor angular inaccuracies that occur when placing
the servo horn on the servo. In many cases, the servo
horn is not exactly perpendicular to the servo (or in
the exact optimum desired position). Minor sub trim
values can be used to correct this offset inaccuracy.
However, it’s important to understand that large sub
trim values can limit the total throw of the servo
in that direction so small sub-trim values only are
recommended.
The user name, model number and model name are
also displayed in this screen.
to access the sub trIM functIon
In the List screen use the roller to highlight the Sub
Trim function.
Press the roller to access the Sub Trim function. The
above screen will appear.
Use the roller to select the desired channel that you
wish to reverse.
ST= Steering
TH= Throttle
AX= Auxiliary
Press the roller to highlight that channel and the
surrounding box will flash; then rotate the roller to
adjust the value and direction of the sub trim.
To return to the Main screen press and hold the roller
for more than three seconds.
tIMer
Us er Na me
01 : Mod el 0 1
Tim er
Int e r n a l R es et
Int 0 : 0 8 : 1 9
Int 0 : 0 8 : 1 8
Tim e r A :
Dn Tm r 05: 0 0
Tim e r B :
≤
The DX3R offers three types of timers.
Internal timer
Automatically records the time that the transmitter is
turned on. Timer A is defaulted to the internal timer.
Up timer
The Up Timer is triggered via a selectable button/
switchandcountsupfrom00:00seconds,functioning
as a stopwatch. It is useful for timing a fuel run
to determine fuel mileage/pit stop strategy or, for
electrics, to time the run time of a pack to determine
gear ratio and setup information. To pause the
Up timer, press the button/switch that the timer is
programmedto.ToresettheUPtimerto00:00,press
and hold the programmed button for more than three
seconds.
Down timer
Can be programmed for up to 99 minutes and 99
seconds in one-second increments. Normally this
timer is programmed for the length of the race with
electricsandisdefaultedto5:00minutes,orthe
duration of the fuel tank in gas, warning the driver that
it’s time to pit and refuel. The Down timer is started
via a selectable programmable switch. When the down
timer expires, an alarm will sound and the timer will
begin to count up. To pause the Down timer, press
the button/switch that the timer is programmed to.
To reset the Down timer to its preprogrammed value,
press and hold the programmed button for more than
three seconds. Timer B is defaulted to the Down timer,
thetimeisdefaultedto5:00minutesandbuttonFis
defaulted to actuate the down timer.
Two of the three timers can be selected and displayed
on the main screen. The user name, model number
and model name are also displayed in this screen.
to access the tIMer functIon
From the List screen rotate the roller to highlight the
Timer function.
Press the roller to enter the Timer function. The Timer
screen will be displayed as shown above.
Rotate the roller to highlight the desired Timer that
you choose to program (Timer A or Timer B).
Press the roller to enter the highlighted Timer
function.
Rotatetherollertoselect:
Int- Internal
Dn Tmr- Down Timer
Up Tmr- Up Timer
Note:IfDowntimerisselected,pressingthe
roller again will allow the time to be changed by
rotating the roller.
To reset the internal timer, rotate the roller to highlight
Internal Reset then press the roller to reset the internal
timerto0:00:00.
See System on page 28 for details on programming
the timers to various buttons and switches.

22 SPEKTRUM DX3R USER GUIDE
23SPEKTRUM DX3R USER GUIDE
bInd
Us er Na me
01 : Mod el 0 1
Bin d
BIND
Pla c e t h e R X
int o b i n d
mod e f i r s t .
≤
Binding is the process of teaching the receiver the
specific transmitter’s code called GUID (Globally
Unique Identifier) and storing failsafe values. When a
receiver is bound to a transmitter/model memory, the
receiver will only respond to that specific transmitter/
model memory (see ModelMatch below). It’s also
important to understand that during the binding
process the transmitter is learning the type of receiver
that it’s being bound to, and the transmitter configures
itself to transmit in DSM or DSM2 protocol depending
on the type of receiver that it’s being bound to. Note
that the DX3R stores this information for each model
memory and recalls the proper protocol when that
model is selected. See ModelMatch below.
Note:Ifareceiverisnotboundtoaspecific
model memory, it will not operate.
ModelMatch
The DX3R features patent pending ModelMatch
technology that prevents operating a model using the
wrong model memory. During the binding process,
the receiver actually stores the code that is assigned
to the specific model that is currently selected in the
transmitter.Forexample:ifthemodelthatisselected
in the transmitter is model #3, when a receiver is
bound to that transmitter, the receiver will only operate
when model #3 is selected. If another model memory
is selected (model #5 for example) the receiver will
not connect. If model three is again selected in the
transmitter, the receiver bound to model #3 will
connect. ModelMatch prevents operating a model
using the wrong model memory.
bIndIng a receIver
Note:TheSR3100operatesinDSM2modeand
is compatible with transmitters that utilize DSM2
protocol.
1. With the receiver off insert the bind plug into the Batt/
Bind port in the receiver.
2. Power up the receiver. If using an electronic speed
controller the lead should be plugged into the throttle
port and the switch turned on. If a receiver battery pack
is used, plug the battery lead into any open port noting
the polarity.
3. Turn on the transmitter and make sure the transmitter is
in the desired model number that you intend to use.
4. Press the rolling selector to access the List screen.
5. Rotate the roller to highlight the Bind screen and press
the roller to access this screen.
Us er Na me
01 : Mod el 0 1
Bin d
BIND
Pla c e t h e R X
int o b i n d
mod e f i r s t .
≤
6. Rotate the roller to highlight BIND.
7. With the steering wheel, throttle stick and Aux
channel (if applicable) in the desired preset failsafe
positions, press the roller to initiate the bind process
and to store the failsafe positions. BIND will flash for
a few seconds; then the transmitter will beep, indicating
the process is complete. The LED on the receiver should
now be solid, indicating a successful bind has taken
place.
8. Remove the bind plug and store it in a
convenient place.
Note:Theonlytimeit’snecessarytodoarebind
is when different failsafe positions are desired,
or if the receiver is to be bound to a different
model memory.
Note:SomeSpektrumreceivers,likethe
SR3000, use a bind button rather than a bind
plug. The binding process is the same with this
receiver. However, instead of inserting the plug
before powering up the receiver, press and hold
the bind button while powering up the receiver
to enter the bind mode.
faIlsafe
Failsafe positions are also set during binding. In the
unlikely event that the radio link is lost during use, the
receiver will drive the servos to their preprogrammed
failsafe positions (normally full brakes and straight
steering). If the receiver is turned on prior to turning
on the transmitter, the receiver will enter the failsafe
mode, driving the servos to their preset failsafe
positions. When the transmitter is turned on, normal
control is resumed. Failsafe servo positions are set
during binding (see Bind on the previous page).

24 SPEKTRUM DX3R USER GUIDE
25SPEKTRUM DX3R USER GUIDE
fraMe rate
Us er Na me
01 : Mod el 0 1
Fra me Ra te
Fra m e r a t e:
11m s
CA UTI ON :
Dig i t a l s e rv os
mus t b e u s e d
wit h 5 . 5 m s
≤
To allow the DX3R to be compatible with all types of
servos (older analogs through the latest high response
rate digitals), three frame rates are available. Please
note Marine receivers will always output at 22ms and
cannot be changed by this feature even though the
values can be changed.
5.5ms: Givesthefastestresponserate;isonly
compatible with high-performance
digital servos. Works with both DSM
and DSM2 surface receivers. Please
note DSM surface receivers output at
11ms when 5.5ms is selected.
Note: when 5.5ms frame rate is selected
only two channels (steering and throttle) are
operational.
11ms: Offersgoodresponseratesandis
compatible with most digital and
analog servos (this is the default
position). Works with both DSM and
DSM2 surface receivers.
16.5ms: Thisistheleastresponsiverateandis
needed for older analog servos. Works
only with DSM2 surface receivers.
Note:It’salwaysrecommendedthatthefastest
response rate that the servos can handle be
used, as this gives the lowest latency/fastest
response. If the frame rate is incompatible
with the servo, the servo will move erratically
or in some cases not at all. If this occurs, it’s
necessary to change the frame rate to the next
highest value.
to access the
fraMe rate functIon
In the List screen, use the roller to highlight the Frame
Rate function.
Press the roller to access the Frame Rate function. The
above screen will appear.
Use the roller to select and highlight Frame Rate, at
the bottom of the screen.
Press the roller to highlight the Frame Rate, function
and the surrounding box will flash. Then rotate the
roller to select the frame rate.
To return to the Main screen, press and hold the roller
for more than three seconds.
MIxIng
The mixing function allows any of the channels
(steering, throttle and Aux.) to be mixed to any
channel. Two mixes are available, Mix A and Mix
B. Both mixes function identically. Typically this is
used for dual steering servos in giant-scale trucks or
for dual throttles in dual engine boats. The primary
or controlling channel is called the master while the
channel that is mixed to is called the slave. The slave
channel follows the movement of the master channel
based on the mixing value that is programmed.
Negative values cause the slave to move in the
opposite direction. Note that the trim is active for both
the master and slave channels.
Us er Na me
01 : Mod el 01
Master
Inh i bit
Slave
Aux i liar y
Value
+0% + 0 %
Mix a
≤
to access the MIx functIon
In the List screen use the roller to highlight the Mixing
function.
Press the roller to access the Mixing function. The
Mixing screen will then appear.
Use the roller to select the desired Mix that you wish
to adjust, Mix A or Mix B.
Press the roller to highlight that mix and the
surrounding box will flash, then rotate the roller to
access that mix function.
Use the roller to highlight the master or slave
channels, then press the roller to access master
or slave.
Use the roller to highlight Value, then press the
roller. Adjust the mix values by rotating the roller.
Independent values can be adjusted by holding the
master channel input (e.g. steering wheel) in the
desired direction and scrolling the roller.
To return to the Main screen press and hold the roller
for more than three seconds.
Mixing values and their proportions can be observed
in the Monitor screen on page 28.
trIM steP
Us er Na me
01 : Mod el 0 1
Tri m Ste p
Ste e r i n g 4
Thr o t t l e 4
≤
The Trim Step function allows the user to adjust the
sensitivity of the steering and throttle/brake trims.
It’s important to understand that Trim Step affects the
amount the servo travels with each click of the trim
but has no effect on the total trim travel. In essence,
Trim Step changes the number of trim steps that are
available within the trim stroke and has no effect on
the total trim travel. Trim Step allows the user to fine-
tune the steering, throttle and brake trims to meet the
needs of specific applications.

26 SPEKTRUM DX3R USER GUIDE
27SPEKTRUM DX3R USER GUIDE
to access the trIM steP functIon
In the List screen use the roller to highlight the Trim
Step function.
Press the roller to access the Trim Step function. The
above screen will appear.
Use the roller to select the desired channel that you
wish to adjust the trim step of.
Press the roller to highlight that channel and the
surrounding box will flash then rotate the roller to
adjust the Trim Step value. The adjustment range
is from 1 to 20 (very fine to coarse trim steps). The
default setting is 4.
To return to the main screen press and hold the roller
for more than three seconds.
reset
Mo del
01 : Mod el 0 1
Res et
Use r N a m e
Par a m e t e rs
≤
The reset function is used to reset the Model Memory
that is selected and the User Name back to the
factory defaults. The Parameters function is used
to recalibrate the transmitter’s steering and brake
potentiometers.
to access the reset functIon
In the List screen use the roller to highlight the Reset
function.
The above screen will appear.
Rotate the roller to access the desired function that
you choose to reset.
Model: Resetthemodelmemorythatis
displayed
UserName: Resettheusername
Parameters: Recalibratethetransmitter’ssteering
and brake potentiometers
Press the roller to access the selected reset function. If
the model was selected use the roller to select the
desired model memory that you wish to reset. Then
press the roller to access the Confirm screen.
Re set
01 : Mod el 0 1
Con fir m
NO
YES
≤
Use the roller to highlight YES; then press the roller
to reset.
To return to the Main screen press and hold the roller
for more than three seconds.
to access the ParaMeters
(recalIbrate) functIon
Mo del
01 : Mod el 0 1
Res et
Use r N a m e
Par a m e t e rs
≤
Warning: If calibration is not properly
completed the radio will not function correctly.
If after calibration the steering or throttle does
not function properly (the travel is reduced or no
servo travel), it will be necessary to recalibrate
the transmitter.
In the List screen use the roller to highlight the
Reset function.
The above screen will appear.
Use the roller to access Parameters.
Press the roller to access the Confirm screen.
Pa ram et ers
Re set
Con fir m
NO
YES
≤
Use the roller to highlight YES then press the roller to
reset. The following screen will appear.
Warning: Once YES is selected, you must
complete all the calibration steps described
in this section or the radio will not function
properly.
To return to the main screen press and hold the roller
for more than three seconds.
Cyc l e
Con t r o l s
SA VE
Cal ibr ate
CH1 - 2 01 5
CH1 2 0 19
CH1 + 2 02 5
CH2 - 2 24 0
CH2 2 2 40
CH2 + 2 24 1
≤
Rotate the steering wheel full right then full left; then
move the throttle trigger to full throttle and full brake.
Note:Thevalueswillchangetocorrelatewith
the actual potentiometers.
After the steering and throttle/brakes have been
transitioned throughout their stroke, use the roller
to highlight SAVE and press the roller to save the
calibration settings.

28 SPEKTRUM DX3R USER GUIDE
29SPEKTRUM DX3R USER GUIDE
MonItor
Us er Na me
01 : Mod el 0 1
ST + 129
TH + 0
AX + 0
Mon ito r
≤
A servo monitor is available that displays the
servo output positions graphically and digitally.
This monitor can be useful in troubleshooting setups,
displaying mixing functions and how they interrelate,
etc.
to access the MonItor functIon
In the List screen use the roller to highlight the
Monitor function.
Press the roller to access the Monitor function. The
above screen will appear and real-time servo output
positions will be displayed.
To return to the Main screen press and hold the roller
for more than three seconds.
systeM
Sys tem
Sw i tch Se lect
A B C D E F
Us e rnam e
◊
Co n tras t: 10
RF M o de: ST D
Vo l tage A lert
4. 0 v
Us e r Name
≤
The System function allows the six available switches
(A,B,C,D,E and F) to be programmed to the desired
function. It allows the user name to be selected,
contrast to be adjusted, and the voltage alarm
threshold to be set.
swItch select
The Switch select function allows any of the six
available switches (A, B, C, D, E and F) to be assigned
oneofthefollowingfunctions:
Swi tch
Us e r Name
01 : Mode l 0 1
A- T h r Trim +
B- S t r Trim +
C- A u x Lin +
D- S t r S/R +
E- B r ake +
F- T i mer
≤
Inhibit Switch/button turned off
Aux 3P Channel three functions as a three-
position output
Aux 2P Channel three functions as a two-
position output
Aux Lin- Channel three functions as a
linear output
Brake Full brake trim
Thr Exp Throttle exponential
Thr Trim Throttle trim—adjusts the neutral
throttle position
S/R Override Steering override
Str Exp Steering exponential
Str S/R Steering rate
Str Trim Steering trim
Timer Activates up or count down timer
to PrograM a swItch or button
Highlight the desired switch/button and press the
roller. Use the roller to select the desired function from
the list above.
Note:Apositive+ornegative–valueis
available for many of the above functions
allowing the reversing of the switch direction.
user naMe
A user name with up to ten characters can be
programmed and the name displayed on the
Main screen.
to PrograM a user naMe
In the System screen highlight the User Name and
press the roller to access the function.
Sys tem
Sw i tch Se lect
A B C D E F
Us e rnam e
◊
Co n tras t: 10
RF M o de: ST D
Vo l tage A lert
4. 0 v
Ra c er X
≤
Use the roller to select the position, then press the
roller to access the character.
Contrast is adjustable from 0 to 30. Highlight
the Contrast function then scroll the roller to
adjust the contrast.
The Voltage Alert sets the voltage threshold at which
the alarm sounds. The default setting is 4.0 volts,
however, if you wish to change this setting, highlight
the Voltage Alert function and press the roller.
Scrolling the roller will allow the voltage threshold to
be adjusted from 0.0 to 6.5 volts.
rf Mode
STD is the standard RF mode. FR is the France RF
mode and should only be selected if the transmitter is
used in France.

30 SPEKTRUM DX3R USER GUIDE
31SPEKTRUM DX3R USER GUIDE
general notes
Radio controlled models are a great source of
pleasure. Unfortunately, they can also pose a potential
hazard if not operated and maintained properly.
It is imperative to install your radio control system
correctly. Additionally, your level of operating
competency must be high enough to ensure you are
able to control your model under all conditions. If you
are a newcomer to radio controlled models, please
seek help from an experienced modeler or your local
hobby shop.
Safety Points to Obey for Modelers
• Ensureyourbatteries(bothtransmitterandreceiver)
have been properly charged for your model.
• Keeptrackofthetimethesystemisturnedonsoyou
will know how long you can safely operate your DX3R.
• Checkallservosandtheirconnectionspriorto
each run.
• Donotoperateyourmodelnearspectators,parking
areas or any other area that could result in injury to
people or damage of property.
• Donotoperateyourmodelduringadverseweather
conditions. Poor visibility can cause disorientation and
loss of control of your model.
• Donotpointthetransmitterantennadirectlytowardthe
model. The radiation pattern from the tip of the antenna
is inherently low.
• Donottakechances.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. Safety can never be taken lightly.
warranty and
user InforMatIon
warnIng
An RC model is not a toy! If misused, it can cause
serious bodily harm and damage to property. Operate
only in open areas, following all instructions included
with your radio.
warranty PerIod
Exclusive Warranty- Horizon Hobby, Inc., (Horizon)
warranties that the Products purchased (the “Product”)
will be free from defects in materials and workmanship
for a period of 1 year from the date of purchase by the
Purchaser.
lIMIted warranty
(a) This warranty is limited to the original Purchaser
(“Purchaser”) and is not transferable. REPAIR
OR REPLACEMENT AS PROVIDED UNDER THIS
WARRANTY IS THE EXCLUSIVE REMEDY OF THE
PURCHASER. This warranty covers only those
Products purchased from an authorized Horizon
dealer. Third party transactions are not covered by this
warranty. Proof of purchase is required for warranty
claims. Further, Horizon reserves the right to change
or modify this warranty without notice and disclaims
all other warranties, express or implied.
(b) Limitations- HORIZON MAKES NO WARRANTY
OR REPRESENTATION, EXPRESS OR IMPLIED,
ABOUT NON-INFRINGEMENT, MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE OF THE
PRODUCT. THE PURCHASER ACKNOWLEDGES
THAT THEY ALONE HAVE DETERMINED THAT
THE PRODUCT WILL SUITABLY MEET THE
REQUIREMENTS OF THE PURCHASER’S INTENDED
USE.
tIPs on usIng sPektruM 2.4ghz
While your DSM equipped 2.4GHz system is intuitive
to operate, functioning nearly identically to 27
and 75MHz systems, following are a few common
questions from customers.
1.Q:WhichdoIturnonrst,thetransmitterorthe
receiver?
 A:Itdoesn’tmatter,althoughitissuggestedto
turn the transmitter on first. If the receiver is turned
on first, all channels will be driven to the failsafe
position set during binding. When the transmitter
is then turned on, the transmitter scans the 2.4GHz
band and acquires an open channel. Then the
receiver that was previously bound to the transmitter
scans the band and finds the GUID (Globally Unique
Identifier code) stored during binding. The system
then connects and operates normally.
If the transmitter is turned on first, the transmitter
scans the 2.4GHz band and acquires an open
channel. When the receiver is turned on, the receiver
scans the 2.4GHz band looking for the previously
stored GUID. When it locates the specific GUID
code and confirms uncorrupted repeatable packet
information, the system connects and normal
operation takes place. Typically this takes 2 to 6
seconds.
2.Q:Sometimesthesystemtakeslongertoconnect
and sometimes it doesn’t connect at all?
 A:Inorderforthesystemtoconnect(afterthe
receiver is bound) the receiver must receive a
large number of consecutive uninterrupted perfect
packets from the transmitter in order to connect.
This process is purposely critical of the environment
ensuring that it’s safe to operate when the system
does connect. If the transmitter is too close to the
receiver (less than 4 ft) or if the transmitter is located
near metal objects (metal TX case, the bed of a truck,
the top of a metal work bench, etc.) connection
will take longer and in some cases connection
will not occur as the system is receiving reflected
2.4GHz energy from itself and is interpreting this
as unfriendly noise. Moving the system away from
metal objects or moving the transmitter away from
the receiver and powering the system again will
cause a connection to occur. This only happens
during the initial connection. Once connected the
system is locked in and should a loss of signal
occur (failsafe) the system connects immediately
(4ms) when signal is regained.
3.Q:I’veheardthattheDSMsystemislesstolerantof
low voltage. Is this correct?
 A:AllSpektrumsurfacereceivershavean
operational voltage range of 3.5 to 9.6 volts. With
most systems this is not a problem as in fact most
servos cease to operate at around 3.8 volts. When
using multiple high-current draw servos with a
single or inadequate battery/power source, heavy
momentary loads can cause the voltage to dip below
this 3.5-volt threshold, causing the entire system
(servos and receiver) to brown out.
4.Q:Sometimesmyreceiverlosesitsbindandwon’t
connect requiring rebinding. What happens if the
bind is lost during use?
 A:Thereceiverwillneverloseitsbindunlessit’s
instructed to. It’s important to understand that during
the binding process the receiver not only learns the
GUID (code) of the transmitter but the transmitter
learns and stores the type of receiver that it’s bound
to. If the system fails to connect, more than likely the
transmitter is near conductive material (transmitter
case, truck bed, etc.) and the reflected 2.4GHz
energy is preventing the system from connecting.
(See tip #2)

32 SPEKTRUM DX3R USER GUIDE
33SPEKTRUM DX3R USER GUIDE
(c) Purchaser Remedy- Horizon’s sole obligation
hereunder shall be that Horizon will, at its option,
(i) repair or (ii) replace, any Product determined by
Horizon to be defective. In the event of a defect, these
are the Purchaser’s exclusive remedies. Horizon
reserves the right to inspect any and all equipment
involved in a warranty claim. Repair or replacement
decisions are at the sole discretion of Horizon.
This warranty does not cover cosmetic damage or
damage due to acts of God, accident, misuse, abuse,
negligence, commercial use, or modification of or
to any part of the Product. This warranty does not
cover damage due to improper installation, operation,
maintenance, or attempted repair by anyone other than
Horizon. Return of any goods by Purchaser must be
approved in writing by Horizon before shipment.
daMage lIMIts
HORIZON SHALL NOT BE LIABLE FOR SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES, LOSS
OF PROFITS OR PRODUCTION OR COMMERCIAL
LOSS IN ANY WAY CONNECTED WITH THE
PRODUCT, WHETHER SUCH CLAIM IS BASED IN
CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT
LIABILITY. Further, in no event shall the liability of
Horizon exceed the individual price of the Product
on which liability is asserted. As Horizon has no
control over use, setup, final assembly, modification
or misuse, no liability shall be assumed nor accepted
for any resulting damage or injury. By the act of use,
setup or assembly, the user accepts all resulting
liability.
If you as the Purchaser or user are not prepared to
accept the liability associated with the use of this
Product, you are advised to return this Product
immediately in new and unused condition to the place
of purchase.
Law:TheseTermsaregovernedbyIllinoislaw
(without regard to conflict of law principals).
safety PrecautIons
This is a sophisticated hobby Product and not a toy.
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. The Product
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 injury.
questIons, assIstance,
and rePaIrs
Your local hobby store and/or place of purchase
cannot provide warranty support or repair. Once
assembly, setup or use of the Product has been
started, you must contact Horizon directly. This will
enable Horizon to better answer your questions
and service you in the event that you may need any
assistance. For questions or assistance, please direct
your email to [e-mail],
or call 877.504.0233 toll free to speak to the Product
Support department.
InsPectIon or rePaIrs
If this Product needs to be inspected or repaired,
please call for a Return Merchandise Authorization
(RMA). Pack the Product securely using a shipping
carton. Please note that original boxes may be
included, but are not designed to withstand the
rigors of shipping without additional protection. Ship
via a carrier that provides tracking and insurance
for lost or damaged parcels, as Horizon is not
responsible for merchandise until it arrives
and is accepted at our facility. A Service Repair
Request is available at www.horizonhobby.com on
the “Support” tab. If you do not have internet access,
please include a letter with your complete name,
street address, email address and phone number
where you can be reached during business days, your
RMA number, a list of the included items, method of
payment for any non-warranty expenses and a brief
summary of the problem. Your original sales receipt
must also be included for warranty consideration. Be
sure your name, address, and RMA number are clearly
written on the outside of the shipping carton.
warranty InsPectIon and rePaIrs
To receive warranty service, you must include
your original sales receipt verifying the proof-
of-purchase date. Provided warranty conditions have
been met, your Product will be repaired or replaced
free of charge. Repair or replacement decisions are at
the sole discretion of Horizon Hobby.
non-warranty rePaIrs
Should your repair not be covered by warranty
the repair will be completed and payment will
be required without notification or estimate
of the expense unless the expense exceeds
50% of the retail purchase cost. By submitting
the item for repair you are agreeing to payment of
the repair without notification. Repair estimates are
available upon request. You must include this request
with your repair. Non-warranty repair estimates will
be billed a minimum of ½ hour of labor. In addition
you will be billed for return freight. Please advise us
of your preferred method of payment. Horizon accepts
money orders and cashiers checks, as well as Visa,
MasterCard, American Express, and Discover cards. If
you choose to pay by credit card, please include your
credit card number and expiration date. Any repair left
unpaid or unclaimed after 90 days will be considered
abandoned and will be disposed of accordingly.
Please note: non-warranty repair is only
available on electronics and model engines.
United States
Electronics and engines requiring inspection or repair
shouldbeshippedtothefollowingaddress:
Horizon Service Center
4105 Fieldstone Road
Champaign, Illinois 61822
All other Products requiring warranty inspection or
repairshouldbeshippedtothefollowingaddress:
Horizon Product Support
4105 Fieldstone Road
Champaign, Illinois 61822
Please call 877-504-0233 or e-mail us at
[e-mail] with any
questions or concerns regarding this product or
warranty.
United Kingdom
Electronics and engines requiring inspection or repair
shouldbeshippedtothefollowingaddress:
Horizon Hobby UK
Units 1-4 Ployters Rd
Staple Tye
Harlow, Essex
CM18 7NS
United Kingdom
Pleasecall+44(0)1279641097ore-mailusat
[e-mail] with any questions or
concerns regarding this product or warranty.
Germany
Electronics and engines requiring inspection or repair
shouldbeshippedtothefollowingaddress:
Horizon Technischer Service
Hamburger Strasse 10
25335 Elmshorn
Germany
Pleasecall+4941214619966ore-mailusat
[email protected] with any questions or
concerns regarding this product or warranty.

34 SPEKTRUM DX3R USER GUIDE
35SPEKTRUM DX3R USER GUIDE
safety, PrecautIons,
and warnIngs
As the user of this product, you are solely responsible
for operating it in a manner that does not endanger
yourself and others or result in damage to the product
or the property of others.
Carefully follow the directions and warnings for
this and any optional support equipment (chargers,
rechargeable battery packs, etc.) that you use.
This model is controlled by a radio signal that is
subject to interference from many sources outside
your control. This interference can cause momentary
loss of control so it is necessary to always keep a safe
distance in all directions around your model, as this
margin will help to avoid collisions or injury.
• Alwaysoperateyourmodelinanopenareaawayfrom
cars, traffic, or people.
• Avoidoperatingyourmodelinthestreetwhereinjury
or damage can occur.
• Neveroperatethemodeloutintothestreetorin
populated areas for any reason.
• Neveroperateyourmodelwithlowtransmitter
batteries.
• Carefullyfollowthedirectionsandwarningsfor
this and any optional support equipment (chargers,
rechargeable battery packs, etc.) that you use.
• Keepallchemicals,smallpartsandanythingelectrical
out of the reach of children.
• Moisturecausesdamagetoelectronics.Avoidwater
exposure to all equipment not specifically designed
and protected for this purpose.
fcc InforMatIon
This device complies with part 15 of the FCC rules.
Operationissubjecttothefollowingtwoconditions:
(1) This device may not cause harmful interference,
and (2) this device must accept any interference
received, including interference that may cause
undesired operation.
Caution:Changesormodificationsnot
expressly approved by Horizon Hobby, Inc.
could void the user’s authority to operate the
equipment.
This product contains a radio transmitter with wireless
technology which has been tested and found to be
compliant with the applicable regulations governing
a radio transmitter in the 2.400GHz to 2.4835GHz
frequency range.
declaratIon of conforMIty
(in accordance with ISO/IEC 17050-1)
No. HH2008111006
Product(s): SpektrumDX3RTransmitter
ItemNumber(s):SPM3100
Equipmentclass:  2
The objects of declaration described above are in
conformity with the requirements of the specifications
listed below, following the provisions of the European
R&TTEdirective1999/5/EC:
EN 300-328 v1.7.1 ERM requirements for
wideband transmission
systems operating in the
2.4GHz ISM band
EN 301 489-1 v.1.6.1 General EMC requirements
for Radio equipment
EN 301 489-17 v.1.2.1
ce coMPlIance InforMatIon
for the euroPean unIon
Instructions for Disposal of WEEE by
Users in the European Union
This product must not be disposed of
with other waste. Instead, it is the user’s
responsibility to dispose of their waste
equipment by handing it over to a designated
collections point for the recycling of waste electrical
and electronic equipment. The separate collection
and recycling of your waste equipment at the time of
disposal will help to conserve natural resources and
ensure that it is recycled in a manner that protects
human health and the environment. For more
information about where you can drop off your waste
equipment for recycling, please contact your local city
office, your household waste disposal service or
where you purchased the product.
The associated regulatory agencies of the following
countries recognize the noted certifications for this
productasauthorizedforsaleanduse:
UK DE DK BG SE FI
EE LV LT PL CZ SK
HU RO SI AT IT ES
PT IE NL LU MT CY
GR FR
Signedforandonbehalfof:
Horizon Hobby, Inc.
Champaign, IL USA
Nov10, 2008
Steven A. Hall
Vice President
International Operations and Risk Management
Horizon Hobby, Inc.