SD Logo is a 

trademark of 

SD-3C, LLC

Instruction Manual

Bedienungsanleitung

Manuel d’utilisation

Manuale di istruzioni

Manual de Instrucciones

The Leader in Spread Spectrum Technology

SD Logo is a 

trademark of 

SD-3C, LLC

Instruction Manual

8-Channel DSM Radio System with 

Integrated Telemetry for Airplanes and 

Helicopters

The Leader in Spread Spectrum Technology

EN
4 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

NOTICE

All instructions, warranties and other collateral documents are subject to change at the sole discretion of Horizon Hobby, Inc. 

For up to date product literature, visit http://www.horizonhobby.com/ProdInfo/Files/SPM8800-manual.pdf.

Meaning of Special Language:

The following terms are used throughout the product literature to indicate various levels of 

potential harm when operating this product:

NOTICE: Procedures, which if not properly followed, create a possibility of physical property damage 

AND a little or no possibility of injury

CAUTION: Procedures, which if not properly followed, create the probability of physical property 

damage AND a possibility of serious injury.

WARNING: Procedures, which if not properly followed, create the probability of property damage, 

collateral damage, and serious injury OR create a high probability of superficial injury.

WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product

before operating. Failure to operate the product correctly can result in damage to the product, personal

 property and cause serious injury. 

This is a sophisticated hobby product 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. Do not attempt disassembly, use with incompatible components or augment product in any way 

without the approval of Horizon Hobby, Inc. This manual contains instructions for safety, operation and maintenance. 

It is essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in 

order to operate correctly and avoid damage or serious injury.

 WARNING AGAINST COUNTERFEIT PRODUCTS

 Thank You for purchasing a genuine Spektrum Product. Always purchase products from a Horizon Hobby, Inc. authorized 

dealer to ensure authentic high-quality Spektrum product. Horizon Hobby, Inc. disclaims all support and warranty with 

regards, but not limited to, compatibility and performance of counterfeit products or products claiming compatibility with 

DSM2 or Spektrum.

WARRANTY REGISTRATION

Visit www.spektrumrc.com/registration today to register your product.

EN
SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

5

Spektrum’s DX8 with Integrated Telemetry ......................................................6

Included Items..................................................................................................6

System Features...............................................................................................6

Charging Your Transmitter................................................................................7

NiMH/LiPo Battery Support..............................................................................7

Battery and Charging Precautions and Warnings.............................................7

Transmitter Identification Mode 2.....................................................................8

Transmitter Identification Mode 1.....................................................................9

Key Input and Display Functions....................................................................10

Digital Trims...................................................................................................10

Inactivity Warnings.........................................................................................10

No RF Output Warning ...................................................................................10

Battery Alarm and Display..............................................................................10

Programmable Alarms....................................................................................10

AR8000 Receiver............................................................................................10

Receiver Installation........................................................................................11

Binding...........................................................................................................11

Failsafe...........................................................................................................12

SmartSafe.......................................................................................................12

Hold Last Command Failsafe.........................................................................12

Preset Failsafe................................................................................................12

Range Testing .................................................................................................13

System Setup...........................................................................................13

Model Select...................................................................................................14

Model Type.....................................................................................................14

Model Name...................................................................................................15

Wing Type.......................................................................................................15

Switch Select (Air)..........................................................................................15

Swash Type.....................................................................................................15

Switch Select (Heli) ........................................................................................16

F-Mode Setup.................................................................................................16

Trim Step ........................................................................................................16

Model Reset....................................................................................................17

Model Copy....................................................................................................17

Warnings........................................................................................................18

Telemetry........................................................................................................18

Frame Rate......................................................................................................20

Trainer.............................................................................................................20

System Settings..............................................................................................20

Transfer SD Card ............................................................................................21

Function Mode........................................................................................22

Servo Setup....................................................................................................22

D/R and Exponential.......................................................................................23

Differential ......................................................................................................24

Throttle Cut.....................................................................................................25

Throttle Curve (Air).........................................................................................25

Throttle Curve (Heli).......................................................................................26

Flap System....................................................................................................26

Swashplate.....................................................................................................27

Governor.........................................................................................................28

Pitch Curve.....................................................................................................28

Mixing (Air)....................................................................................................29

Aileron to Rudder Mix....................................................................................29

Programmable Mixes (Air).............................................................................29

Tail Curve for Non-Heading Hold Gyro Use Only...........................................30

Mixing (Heli) ..................................................................................................31

Gyro................................................................................................................33

Timer ..............................................................................................................33

Monitor...........................................................................................................35

Troubleshooting Guide...................................................................................35

General Information........................................................................................36

 Servo Precautions

 General Notes

 Safety Do’s and Don’ts for Pilots

 Federal Aviation Administration.................................................................36

 Purpose

 Background

 Operating Standards

 Information Provided by

 Daily Flight Checks

Warranty and Repair Policy............................................................................37

 Warranty Period

 1-Year Limited Warranty

 Damage Limits

 Safety Precautions

 Warranty Services

 Questions, Assistance, and Repairs

 Inspection or Repairs

 Warranty Inspection and Repairs...............................................................38

 Non-Warranty Repairs

FCC Information.............................................................................................38

Antenna Separation Distance..........................................................................38

Compliance Information for the European Union...........................................39

Declaration of Conformity...............................................................................39

Instructions for the Disposal of WEEE............................................................39

Appendix......................................................................................................39

 Mode Changes..........................................................................................39

 Mechanical Conversion.............................................................................39

 Programming Conversion .........................................................................40

 Adjustable Stick Tension ...........................................................................41

 Advanced Range Testing............................................................................41

 Using a Flight Log—Optional...................................................................42

Table of Contents

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6 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Spektrum’s DX8 with Integrated

Telemetry

The DX8 is Spektrum’s first aircraft system that incorporates integrated telemetry. 

The transmitter’s screen displays real-time telemetry including receiver battery 

voltage, flight log data and signal quality. External sensors allow rpm, external 

voltage and temperature to be displayed on screen in real time. Alarms can 

be programmed to warn of low battery, over temperature, exceeded rpm and 

diminished RF signal strength.

The DX8 offers sophisticated programming to meet the demands of even the 

most experienced airplane and helicopter pilots. An easy-to-use rolling selector 

combined with intuitive software makes setting up models quick and easy. The 

DX8 is SD-card compatible allowing an infinite number of models to be stored 

and transferred. Plus firmware updates can be downloaded from the 

SPEKTRUMRC.com website providing the user with the latest software upgrades.

SYSTEM features

•	 Integrated Telemetry

•	 Quad Bearing Gimbals

•	 High Speed 11ms frame rate

•	 2048 resolution

•	 Telemetry warning system

•	 Sophisticated Airplane and Helicopter programming

•	 SD Card compatible

AR8000 ReceiveR

Note: The DX8 is compatible with all current Spektrum DSM2 aircraft 

receivers. 

 CAUTION: When using the DX8 with parkflyer receivers (the 

AR6100 and AR6110), it’s imperative that these receivers only be flown 

in parkflyer-type aircraft (small electric airplanes or mini and micro 

helicopters). Flying receivers designed for parkflyers in larger aircraft 

could cause loss of connection. 

Note: The DX8 is NOT compatible with the original DSM AR600 receiver.

ITEMS INCLUDED

DX8 transmitter

AR8000 8-channel receiver

Power supply w/ adaptors

Neckstrap

SD card

Bind Plug

TM1000 telemetry module

Voltage sensor

Temperature sensor

Data lead

Telemetry Y-Harness

Decal sheet

DX8 instruction manual

Programming Guide

2.0mm L hex wrench

Telemetry module (TM1000)

Voltage Sensor

Temperature Sensor

2.5” Telemetry

Data Lead 

2.5” Telemetry 

Y-harness

16MB SD Card

Male/female bind plug

12V DC Power Supply

Neckstrap

Decal sheet

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 7

Charging Your Transmitter

The DX8 features a built-in multi-chemistry charger designed to charge 4-cell 

NiMH and 2-cell LiPo batteries at a charge rate of 200mAh. The charge jack on 

the right side of the transmitter is non-polarity-critical, allowing you to use any 

type of 12-volt supply to charge the battery regardless of connector polarity. 

Using the included SPMB2000NMTX NiMH battery pack, you should plug the 

included 12-volt AC to DC power supply in for 10 to 12 hours to fully charge 

the battery.

 CAUTION: Never plug in a peak detection or fast charger into your 

DX8 as this could damage the internal charge circuit. Use only a 12V DC 

source.

With the transmitter power turned off, plug the included 12 volt power supply 

into a wall outlet. Then plug the male charge plug into the charge jack. The blue 

LED on the front of the transmitter will illuminate. When charging the optional 

SPMB4000LPTX, a full charge can take up to 30hrs depending on the initial 

charge state of the battery. When charging a LiPo, the blue light will turn off 

when the charge cycle is complete.

NiMH/LiPo Battery Support

The DX8 includes a rechargeable NiMH battery pack. A low battery alarm 

sounds when the battery reaches 4.3 volts. Spektrum offers an optional 2-cell 

LiPo battery pack (SPMB4000LPTX) for the DX8. LiPo batteries have a higher 

operational voltage and when switching to a 2-cell LiPo battery in the transmitter, 

it is important to change the low battery alarm to the LiPo setting to prevent 

over-discharging the pack.

To Access and Change Battery Type

In the System Setting screen (see page 20 in your manual) rotate the roller to 

select NEXT at the bottom right of the System setting screen. The following 

screen appears.

Rotate the roller to highlight battery type. 

Press the roller to access NiMH or LiPo. The low voltage cutoff will default to 

the recommended voltage for the battery type selected. The voltage cutoff can be 

adjusted from this screen, but normally the default cutoff of 6.4 volts for LiPo is 

recommended.

Battery and Charging

Precautions and Warnings

Failure to exercise caution while using this product and comply 

with the following warnings could result in product malfunction, 

electrical issues, excessive heat, FIRE, and ultimately injury and 

property damage.

•	 Read all safety precautions and literature prior to use of this product.

•	 Never allow minors to charge battery packs without adult supervision. 

•	 Never drop power supply or batteries.

•	 Never attempt to charge damaged batteries

•	 Never attempt to charge a battery pack containing different types of 

batteries.

•	 Never charge a battery if the cable has been pinched or shorted. 

•	 Never allow batteries or battery packs to come into contact with moisture 

at any time.

•	 Never charge batteries in extremely hot or cold places (recommended 

between 50-80 degrees F) or place in direct sunlight. 

•	 Always disconnect the battery after charging, and let the charger cool 

between charges.

•	 Always inspect a new battery before charging.

•	 Always terminate all processes and contact Horizon Hobby if the product 

malfunctions.

•	 Always keep batteries and charger away from any material that could be 

affected by heat (such as ceramic and tile), as they can get hot. 

•	 Always end the charging process if the charger or battery becomes hot to 

the touch or starts to change form (swell) during the charge process.

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8 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Transmitter Identification Mode 2

Note: to change transmitter modes see page 39

Antenna

Rolling Selector

Stick Aileron/Elevator

Elevator Trim

Aileron Trim

Power Switch

SD Card Slot

Throttle Trim

Throttle/Rudder

Stick

Handle

Rudder Trim

Elevator D/R

Clear Button

Back Button

Speaker Display Screen

Mix/Hold

Aileron D/R

Rudder D/R

Aux 2/Governor

Charge Jack

R Trimmer

Aux 3 Knob

Trainer/Timer

Bind Button

Flap/Gyro Gear

Flight Mode

L Trimmer

WARNING: ENSURE FUTURE ANTENNA 

SAFETY Do not attempt to use the antenna to bear 

any weight, pick up the transmitter by the antenna or alter 

the antenna in any way. If the transmitter antenna or related 

components become damaged the output strength can be 

severely impeded which could lead to a crash, injury, and 

property damage.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 9

Transmitter Identification Mode 1

Antenna

Rolling Selector

Throttle/Aileron

Stick

Throttle Trim

Aileron Trim

Power Switch

SD Card Slot

Elevator Trim

Elevator/Rudder

Stick

Handle

Rudder Trim

Elevator D/R

Clear Button

Back Button

Speaker Display Screen

Mix/Hold

Aileron D/R

Flight Mode

Aux 2/Governor

Charge Jack

R Trimmer

Aux 3 Knob

Trainer/Timer

Bind Button

Flap/Gyro

Gear

Rudder D/R

L Trimmer

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10 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Key Input and Display Functions

The DX8 utilizes a roller that can be rotated or pressed and two buttons, Back and 

Clear that are used to access and program all the functions.

Direct Model Access- From the main screen, you can access the Model Select 

screen (used to change models) by pressing the Back and Clear buttons 

simultaneously.

Digital Trims

The DX8 2.4 features advanced digital trims. The Main screen displays the 

graphic position for the trims. The Throttle Aileron, Elevator, and Rudder trim 

levers, and when activated the right and left trimmers, feature an audible center 

trim beep and a pause. You can adjust the amount of travel per each trim in the 

Trim Step Function, located in System Setup Mode. See page 16 for more details. 

Note: When the transmitter is turned off, the trims and left and right 

trimmer values are stored in memory and recalled when the system is 

turned back on. 

Inactivity Warning

The DX8 features an inactivity warning that warns if the transmitter is left on 

preventing draining the batteries. If the transmitter is left on and no input is given 

to the sticks or switches for 10 minutes, an alarm will sound and warning screen 

appear. Moving any stick or switch will clear the alarm. Normal RF modulation 

continues throughout the alarm maintaining the RF link.

No RF Output Warning

The DX8 features a No RF output warning. If the 2.4GHz band is full, it’s possible 

that the DX8 may not be able to find open channels when the transmitter is first 

turned on. If the transmitter finds no open channels a warning screen appears and 

will remain until the transmitter is able to find two open channels and transmit.

Battery Alarm and Display

When the transmitter voltage drops below 4.3 volts, “Warning Low Battery” will 

flash and an alarm sound. If you are flying when this occurs, land immediately.

Programmable Alarms

The DX8 features programmable alarms that warn of a potential unsafe switch 

or stick position when the transmitter is turned on. In Acro mode programmable 

alarms include high throttle, gear and mid and land flap positions while in 

helicopter mode warnings include high throttle, Stunt 1, Stunt 2, and Hold. If 

any of these switches or throttle stick position is in an unsafe position when the 

transmitter is turned on, an alarm will sound, the screen will display the offending 

switch position and the transmitter will not transmit a signal. Moving the switch 

or stick to the desired position will clear the warning and normal operation will 

resume. See page 18 for details on programming warnings.

AR8000 Receiver

The AR8000 full range 8-channel receiver features DSM2TM technology and 

is compatible with all SpektrumTM and JR® aircraft radios that support DSM2 

technology including: JR12X, 11X, X9503, X9303, Spektrum DX8, DX7, DX7se, 

DX6i, DX5e and Module Systems.

Note: The AR8000 receiver is not compatible with the Spektrum DX6 

parkflyer transmitter.

Features

• 8-channel full range receiver 

• MultiLink receiver technology 

• Includes one internal and one remote receiver 

• SmartSafeTM failsafe system

• Hold Last Command failsafe

• Preset Failsafe

• QuickConnectTM with Brownout Detection

• Flight Log compatible (optional) 

Press the ROLLER to access screens or functions

Rotate the roller to adjust values or to select options

Note: Pressing the roller for more than three seconds will 

 return to the main screen.

 Press the Clear button to return the highlighted value to its default setting

 Press the Back button to return to the previous screen

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 11

• 2048 Resolution

• High-speed 11ms operation when used with capable transmitters

• Hold indicator (Red LED indicates number of holds incurred 

during flight).

Applications

Full range up to 8-channel aircraft including:

	 • All types and sizes of glow, gas and electric powered airplanes

	 • All types and sizes of no-powered gliders

	 • All types and sizes of glow, gas and electric powered helicopters

Note: Not for use in airplanes that have full carbon fuselages. Not for 

use in airplanes that have significant carbon or conductive structures. It is 

recommended to use one of the carbon fuselage receivers. (SPMAR9300, 

SPMAR6255).

Specifications:

Type: DSM2 full range receiver

Channels: 8

Modulation: DSM2

Main Receiver Dimensions: 1.27 x 1.35 x 0.45 in 

 (32.3 x 34.3 x 11.4mm)

Remote Receiver Dimensions: 0.80 x 1.10 x 0.27 in 

 (20.3 x 28.0 x 6.9mm)

Main Receiver Weight: .33 oz (9.4 g) 

Remote Receiver Weight: .2 oz (3 g)

Weight with Remote Receiver: .49 oz (13.9 g)

 Voltage Range: 3.5 to 9.6V

Resolution: 2048

Frame Rate: 11ms when paired with the DX7se or DX8

Compatibility: All DSM2 aircraft transmitters and module systems

Receiver Installation

In gas and glow aircraft install the main receiver by wrapping it in protective foam 

and fastening it in place using rubber bands or hook and loop strap. 

In electric airplanes or helicopters, you can use thick double-sided foam tape to 

fasten the main receiver in place.

Mount the remote in a slightly different location from the primary receiver. This 

gives tremendous improvements in path diversity. Essentially, each receiver sees 

a different RF environment and this is key to maintaining a solid RF link. This is 

especially the case in aircraft with substantial conductive materials (e.g., larger 

gas engines, carbon fiber, pipes etc), which can weaken the signal.

Using servo tape, mount the remote receiver keeping it at least 2 inches 

away from the primary antenna. Ideally, you should position the antennas 

perpendicular to each other. In airplanes, we recommend mounting the primary 

receiver in the center of the fuselage on the servo tray and the remote receiver to 

the side of the fuselage or in the turtle deck.

Y-Harnesses and Servo Extensions

Do not use amplified Y-harnesses and servo extensions with Spektrum 

equipment. Only use standard non-amplified Y-harnesses and servo extensions. 

When converting existing models to Spektrum, replace all amplified Y-harnesses 

and/or servo extensions with conventional non-amplified versions 

Power System Requirements

Onboard power systems must provide adequate power, without interruption, 

to the receiver even when the system is fully loaded (servos at maximum flight 

loads). Inadequate power systems are a primary cause of in-flight failures. Some 

components that affect the ability to properly deliver adequate power include: 

the selected receiver battery pack (number of cells, capacity, cell type, state of 

charge), switch harness, battery leads and, if used, the regulator and power bus. 

The AR8000’s minimum operational voltage is 3.5-volts. Test the system per the 

following guidelines to a minimum voltage of 4.8-volts during ground testing. 

This will compensate for battery discharging or actual flight loads that are greater 

than ground test loads.

Recommended Power System Guidelines

1. When setting up large or complex aircraft with multiple high-torque 

servos, use a current and voltmeter (HAN172). Plug the voltmeter in an 

open channel port in the receiver, and with the system on, load the control 

surfaces on your aircraft by applying pressure with your hand. Monitor the 

current as you load control surfaces. The voltage should remain above 4.8 

volts even when all servos are heavily loaded.

2. With the current meter inline with the receiver battery lead, load control 

surfaces while monitoring the current. The maximum continuous 

recommended current for a single heavy-duty servo/battery lead is 3 amps. 

Short-duration current spikes of up to 5 amps are acceptable. If your system 

draws more than these currents, you need to use multiple packs of the same 

capacity with multiple switches and multiple leads plugged into the receiver.

3. If using a regulator, perform tests for a 5-minute period. A regulator may 

provide adequate short-term power, but this tests its ability to maintain 

voltage at significant power levels over time.

4. For really large aircraft or complex models, multiple battery packs with 

multiple switch harnesses are necessary. No matter what power systems 

you choose, always carry out test #1. Make sure the receiver is constantly 

provided with 4.8 volts or more under all conditions.

CAUTION: When charging any brand of NiMH battery pack, make sure 

the battery is fully charged. Due to the nature of peak charges and variations in 

charging rates, heat development, and cell types–the capacity reading of a battery 

charged on a fast peak charger may only reach 80% of its nominal value. Use a 

charger that displays total charge capacity. Note the number of mAh put into a 

discharged pack to verify the charge is at full capacity.

Binding

You must bind the receiver to the transmitter before the receiver will operate. 

Binding teaches the receiver the specific code of the transmitter, so it will only 

connect to that transmitter. 

1. To bind an AR8000 to a DSM2 transmitter, insert the bind plug in the BATT/

BIND port on the receiver. 

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12 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Note: To bind an aircraft with an electronic speed controller that powers 

the receiver through the throttle channel (ESC/BEC), insert the bind plug 

into the BATT/BIND port in the receiver and the throttle lead into the throttle 

(THRO) port. Proceed to Step #2.

2. Power the receiver. The LED on the receiver will be flashing, indicating the 

receiver is ready to be bound to the transmitter.

3. Move the sticks and switches on the transmitter to the desired failsafe 

positions (low throttle and neutral control positions).

4. Press and hold the trainer button while powering on transmitter.

5. The system will connect within a few seconds. Once connected, the LED on the 

receiver will go solid indicating connection.

6. Remove the bind plug from the BATT/BND port on the receiver. Power off the 

transmitter and store the bind plug in a convenient place.

NOTICE: Remove the bind plug to prevent the system from entering bind mode 

the next time the power is turned on.

7. After setting up your model, rebind the system so the true low throttle and 

neutral control surface positions are set.

Failsafes

When you bind your transmitter, you are programming the receiver with failsafe 

defaults. If connection is lost between the transmitter and receiver, the receiver 

immediately operates in those preprogrammed default positions. Those positions 

are failsafes. The AR8000 has three failsafes: SmartSafe Failsafe, Hold Last 

Command Failsafe, and Preset Failsafe.

SmartSafe Failsafe

SmartSafe Failsafe is always active in both hold last command failsafe and in 

preset failsafe. SmartSafe is a safety feature on the throttle channel only that offers 

the following benefits:

•	 Prevents electric motors from operating when the receiver only is turned on

(no signal present)

•	 Prevents the speed controller from arming until the throttle is moved to low

throttle position after connection is made

•	 Shuts off electric motor and reduces gas/glow engines to idle if signal is lost

•	 If throttle is at any position other than low, the ESC won’t arm

•	 If connection is lost in flight:

-SmartSafe sets the throttle to the position it was in during the binding 

process.

How To Program

SmartSafe is automatically set when hold last command failsafe or Preset failsafe 

is programmed or the system is bound. Note: It’s important to have the throttle 

stick in the low position to store low throttle during binding

To Test

Confirm the failsafe setting is correct by turning off the transmitter. The throttle 

should go to the preset low throttle position.

CAUTION: Make sure the aircraft is restrained on the ground. If failsafe is 

not set, your aircraft might advance to mid or full throttle.

Hold Last Command

If you lose connection, all channels except for throttle channel hold last given 

command and the aircraft continues on its path. So, if you were turning when 

connection was lost, your aircraft would continue turning.

How to Program

1. Leave the bind plug in the bind port through the entire binding process.

2. Remove bind plug only after receiver connects to transmitter

To Test

Confirm the failsafe settings are correct by turning off the transmitter. All channels 

except for the throttle should hold the last command. 

CAUTION: Make sure the aircraft is restrained on the ground. If failsafe 

is not set, your aircraft might advance to mid or full throttle.

Preset Failsafe

If the signal is lost, all channels are driven to their failsafe position set during 

binding.

Preset Failsafe is ideal for sailplanes, as spoliers can be deployed during loss of 

signal, preventing a flyaway.

How To Program

1. Insert the bind plug and power on the receiver.

2. When the receiver LEDs blink indicating bind mode, remove bind plug 

before binding the transmitter to the receiver.

3. LED lights will continue to blink.

4. Move transmitter’s control sticks and switches to the desired Preset Failsafe 

positions then turn it on in bind mode.

5. The system should connect in less than 15 seconds.

NOTICE: Failsafe features vary according to receiver, so if using a receiver other 

than the AR8000, consult your receiver’s instructions for the failsafes that apply.

Before flight, ALWAYS confirm your binding is good and failsafe is set. To do 

this, make sure the system is connected, turn your transmitter off. Confirm that 

low-throttle is active.

CAUTION: Make sure the aircraft is restrained on the ground. If failsafe is 

not set, your aircraft might advance to mid or full throttle.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 13

Range Testing

The Range Test function reduces the power output. This allows for a range 

test to confirm the RF link is operating correctly. Perform a range check at the 

beginning of each flying session to confirm system operation.

To Access the Range Test screen

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Range Test then press the roller to access the Range 

Test function. 

With the Range Test screen displayed, push and hold the trainer button. The 

screen displays Reduced Power. In this mode the RF output is reduced allowing 

for an operational range test of your system.

If you let go of the trainer button, the transmitter will go back to Full Power.

Range Testing the DX8

1. With the model restrained on the ground, stand 30 paces 

(approx. 90 feet/28 meters) away from the model. 

2. Face the model with the transmitter in your normal flying position and place 

the transmitter into Range Test mode (see above) and push the trainer button 

reducing the power output.

3. Operate the controls. You should have total control of your model with the 

transmitter in Range Test mode. 

4. If control issues occur contact the appropriate Horizon Product Support 

office for assistance.

5. If performing a range test while a telemetry module is active, the display will 

show flight log data.

System Setup

The DX8 organizes the programming screens in two separate categories: 

System Setup Mode and Functions Mode. The System Setup Mode contains 

programming that is generally used when initially setting up a model, and 

seldom used at the field. System Setup functions includes Model Type, Model 

Name, Wing Type, (Swashplate Type for Helis) Model Reset, etc. Note: No 

radio transmission occurs when a System Setup screen is displayed to prevent 

accidental servo operation. This protects linkages/servo gears from damage when 

making programming changes. System Setup in Airplane and Heli Model type 

includes the following screens.

 Airplane Model Helicopter Model

Model Select page 14 Model Select page 14

Model Type page 14 Model Type page 14

Model Name page 15 Model Name page 15

Wing Type page 15 Swash Type page 15

Switch Select page 15 Switch Select page 16

Trim Step page 16 F-Mode Setup page 16

Model Reset page 17 Trim Step page 16

Model Copy page 17 Model Reset page 17

Warnings page 18 Model Copy page 17

Telemetry page 18 Warnings page 18

Frame Rate page 20 Telemetry page 18

Trainer page 20 Frame Rate page 20

System Settings page 20 Trainer page 20

Transfer SD Card page 21 System Settings page 20

 Transfer SD Card page 21

To Access the System Setup List

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

To Access a System Setup Function from the System Setup List

In the System Setup list rotate the roller to highlight the desired function then 

press the roller to access. The selected function screen will appear. 30 paces (90 feet/28 meters)

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14 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Model Select 

The Model Select function is used to change to a different model memory, typically 

when switching from the current model. You can store up to 30 models in the DX8’s 

model memory. You can access the model select function through the System 

Setup mode or through Direct Model Access. Direct Model Access allows you to 

access the model select function at any time the main screen or a telemetry screen 

is displayed.

Direct Access Model Select

 Press the Clear and Back buttons simultaneously to access the Model Select screen 

To directly access the Model Select Screen any time from the Main Screen or the 

Telemetry screen, press the Clear and Back buttons simultaneously. The Model 

Select screen displays for 10 seconds. If no activity occurs, the screen returns to 

the previous Main or Telemetry screen.

To Access the Model Select Function through System Mode

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Highlight Model Select then press the roller to access the function. 

The following screen appears. Rotate the roller to highlight the desired model 

then press to select. The model name will display on the main screen.

ModelMatch

The DX8 features ModelMatch technology that prevents operating a model using 

the wrong model memory. This feature can prevent stripped servo gears, broken 

linkages and even a crash due to attempting to operate a model using the wrong 

memory.

How ModelMatch Works

Each individual model memory (30 in total) has its own embedded code 

transferred to the receiver during the binding process. The receiver actually 

learns the specific model memory selected during binding. When bound, it 

operates only when that model memory is selected. If a different model memory 

is selected, the receiver won’t connect. At any time you can reprogram the receiver 

to operate with any other model memory by rebinding with the transmitter 

programmed to the desired model.

Model Type 

Model Type programs the selected model memory to function in Helicopter or 

Airplane programming. You should program Model Type first when setting up a 

new model. Note: You can assign each model memory its own model type. 

To Access the Model Type Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight Model Type then press to access the function. 

The following screen appears:

Rotate the roller to highlight the desired model type (Helicopter or Airplane) then 

press the roller to select.

The following screen appears. Rotate the roller to highlight YES then press the 

roller to accept the model type. Selecting NO will return you to the previous 

screen. 

Note: When you change model types (Heli to Acro or Acro to Heli) all 

current programming in the selected model memory will reset to the 

factory default settings. All previous settings will be lost.

You can return to the System Setting screen at anytime by 

pressing the Back button on the transmitter once.

To return to the Main screen press the Back button on the 

transmitter twice or press and hold the Roller for more than 

three seconds.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 15

Model Name 

The Model Name function allows you to name a model using up to 10 characters. 

This makes identifying and selecting models much easier. Naming a model is 

normally done during initial setup. You can modify or change names at any time 

without affecting other programming. Typical model names include Vibe 50 3D, 

Extra 300, Blade 400, Sport 40 #1, etc. Note that upper case, lower case, numbers 

and symbols are available.

To Access the Model Name Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight Model Name then press to access the function. 

The following screen appears:

Rotate the roller to highlight the desired character then press to accept. 

Repeat the process until complete. The name will display on the main screen. 

Pressing Clear will erase the current character.

Wing Type 

Use the Wing Type function to program the wing and tail mix to match your 

airplane. Eight wing types (Normal, elevon, dual aileron, 1 aileron and 1 flap, 

flaperon, 1 aileron and 2 flaps, 2 ailerons and 1 flap, 2 ailerons and 2 flaps) and 

five tail types (normal, V-Tail, dual elevator, dual rudder, dual rudder/ elevator) are 

available. You must select the correct wing and tail type to match your airplane 

before doing any other wing or tail related programming (e.g., Flaps, Travel 

Adjust, Sub-Trim, etc.). 

To Access the Wing Type Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight Wing Type then press to access the function.

The following screen appears:

Rotate the roller to highlight Wing and press to access the function. Rotate the 

roller to the desired wing mix. Press the roller to select. 

To access the Tail Type

Rotate the roller to highlight Tail then press. 

Rotate the roller to access the desired tail type. Press the roller to select. 

Switch Select 

The Switch Select function allows the switches, knob and right and left trimmers 

to be assigned to the gear, Aux1, Aux2 or Aux3 channels or inhibit.

To Program the Switch Select Functions

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight the desired switch, knob or trimmer then press the 

roller to access.

Rotate the roller to select the desired channel or function you wish the switch, 

knob or trimmer to operate. Press the roller to accept. Note that the channel or 

function can only be assigned once. 

Repeat to select all desired switch positions. 

Swash Type 

Use the Swash Type screen to program the swashplate mix to match your 

helicopter swashplate type. Six swashplate types are available: Normal, 3-servo 

120 CCPM, 3-servo 140 CCPM, 3-servo 90 CCPM, 3-servo 135 CCPM, and 

2-servo 180 CCPM. Select the correct swashplate type to match the specific 

helicopter before doing any other cyclic programming e.g., Pitch Curve, Travel 

Adjust, Sub-Trim, etc.). If in doubt consult your helicopter’s manual for correct 

swashplate mixing. 

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16 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

To Access the Swash Type Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight Swash Type then press the roller to access the 

function. The following screen appears:

Highlight the current swashplate type then rotate the roller to select the desired 

swashplate mix. When the desired Swashplate mix is displayed press the roller 

to select. In Systems Settings highlight User Name then press the roller to select 

that function. Select the desired mode then press to accept.

Switch Select 

The Switch Select function allows the switches, left knob and right and left 

trimmers to be assigned to functions, channel or inhibit. In helicopter mode the 

following options are available:

Trainer button

Inhibit Gear

Aux 2, Aux 3

Gyro, Mix,Hold, Governor and Flight mode switches

Switch

Inhibit Gear

Aux 2 channel Aux 3 channel

Right knob

Gear Aux 2 channel Aux 3 channel

Throttle Pitch

Right and left trimmers

Can be assigned to one of the following:

Inhibit Hover Pitch

Hover throttle Gyro trim

Governor trim Gear Channel

Aux 2 channel Aux 3 channel

To Program the Switch Select Functions

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight the desired switch, knob or trimmer then press. 

Select the channel or function you wish to assign. See chart for options. Press the 

roller to accept. Note that a channel or function can only be assigned once. 

Repeat to select all desired switch positions. 

F-Mode Setup 

The F-Mode setup screen is used to assign the switches that will be used for 

Flight Mode and Hold. Flight Mode setup is defaulted to Flight Mode -flight 

mode switch and Hold- Inhibited.

You can assign the flight mode and hold functions to any of 9 switches including: 

Inhibit, Aileron D/R, Elevator D/R, Rudder D/R, Gyro switch, Flight Mode Switch, 

Hold and the Governor switch.

To Access the F-Mode Setup Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight F-Mode Setup then press. 

The following screen appears:

Highlight the Flight mode or Hold function then press to access that function. 

Rotate the roller to select the desired switch.

Trim Step 

The Trim Step function allows servo movement adjustment per click of trim. For 

example you usually want a large trim step (8 to 10) for a new model. Each click 

of trim will have a large amount of trim travel so you can quickly adjust an out-oftrim model in flight. Later you can use a finer trim step (1-5) to adjust for precise 

flight. The Trim Step function allows the trims to be common or independent in 

each active flight mode. Many helicopter pilots use independent trims because 

they are automatically active when a flight mode is activated. Important: The 

trim step function has no effect on the overall trim travel, only the total number of 

clicks available. If you select a 0 value in trim step, the trim is turned off. 

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 17

To Access the Trim Step Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight Trim Setup then press to access the function. 

The following screen appears:

Highlight the desired Trim value then press the roller to access. Rotate the roller to 

change to the desired trim value. Press to accept. Repeat to adjust all trim steps.

To Access the Common or Flight Mode Trims

Rotate the roller to highlight Trim Type and press to access.

Select F-Mode (each flight mode has its own trims) or Common (trim are always 

common regardless of flight mode).

Common Trim - When common trim is selected, trim values are common in all 

flight modes. 

F-Mode Trim - When F-Mode is selected, each flight mode including hold has its 

own trims that are automatically active when that flight mode is selected.

Model Reset 

Model Reset is typically used to clear the programming for a model you will no 

longer be flying. Model Reset resets the programming for the selected model 

to factory defaults. No other model memories will be affected. When a model’s 

memory is reset all programming for that model is permanently deleted and 

cannot be recovered. 

To Access the Model Reset Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight Model Reset then press to access the function. 

The following screen appears:

Verify that the model displayed on this screen is the model you wish to reset. If 

not then see page 14 Model Select to access the desired model. Rotate the roller 

to highlight Reset and then press to access the Confirm Reset screen.

Highlight YES If you’re sure you want to reset this model to factory default 

settings, press the roller. The screen will return to the main screen.

Model Copy 

The Model Copy function copies the currently selected model’s programming of 

another model memory. Thirty model memories are available. Some of the more 

common uses of the Model Copy function include:

• Moving the order of models around in model memory so they can be organized

by category, type, etc. Note: You will need to re-bind after moving models.

• Experimenting with the programming for an aircraft while preserving a copy

of the original setup. Note: If you want to use the model copy function to try 

two slightly different setups with the same model you will need to rebind the 

receiver each time you switch between model memories. 

• Copying the programming for an existing model over to a new model that

is similar. Many pilots find this to be a good way to provide more accurate 

baseline programming for the new model. For example Vibe 50 w/120CCPM 

mixing, gyro and governor programming provides a good base programming 

for any other nitro powered 120CCPM mixing helicopter. An Extra 300 with 

dual aileron and elevator servos that is properly programmed with dual flap and

dual elevator mixing in Wing Type provides good foundational programming 

for another aerobatic airplane with the same basic control system. 

Important: The model memory you are copying to will be over-written by the 

copied programming, permanently deleting any programming that may already exist. 

To Access the Model Copy Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight Model Copy then press. 

The following screen appears:

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18 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Verify that the current model displayed on this screen is the model you wish to 

copy. If not then see page 14 Model Select to access the desired model. Rotate 

the roller to select the model memory (1 - 30) that the model will be copied to. 

Select an unused model memory to copy to. When the desired model memory is 

displayed, press the roller to access the Confirm Copy screen.

If you want to Copy this model to the selected model memory, press the roller 

to copy. The screen returns to the main screen when the copy is complete. The 

original model memory you just copied will still be selected.

Warnings 

The Warnings function programs an alarm to sound if specific switches or stick 

positions are in an unsafe position when the transmitter is first turned on. In 

helicopter model type default warnings include Throttle, Stunt 1, Stunt 2 and 

Hold. In airplane model type these warnings include Throttle Low, Flaps, Gear, 

Flight Mode 1 and Flight Mode 2. If you turn the transmitter on and any of these 

switches or the throttle is not at the low position, the alarm will sound; the screen 

will display the warning and no transmission will occur until the stick or switch is 

in the correct position.

To Access the Warnings Screen

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Rotate the roller to highlight Warning then press. 

The following screen appears:

Highlight the desired warning (Throttle, Stunt 1, Stunt 2 or Hold or Throttle, Flaps, 

Gear, Flight Mode 1 and Flight Mode 2 for airplane model) then press the roller to 

select. Now rotate the roller to inhibit or activate the selected warning.

To verify the warning is functioning turn the transmitter off, move the selected switch 

or throttle in the offending position then turn the transmitter on. The alarm will 

sound; the screen will display the specific warning and no modulation will occur. 

Telemetry 

Spektrum’s TM1000 telemetry module is compatible with all Spektrum and JR 

receivers that have a Data (Flight Log) port including:

Spektrum

	 •AR7000	 •AR9000

	 •AR7600	 •AR9200

	 •AR8000	 •AR9300

	 •AR12000 	 •AR7100

	 •AR7100R	 •AR9100

JR

	 •R921	 •R1221

	 •R922	 •R1222

Installing the TM1000

Mount the TM1000 module near the receiver in a position that allows the 3-inch 

data lead to extend from the receiver’s Data port to the Data port on the telemetry 

module. You can use servo tape to secure the TM1000 module or wrap it in foam 

with the receiver. Plug the Data lead into the TM1000 port marked DATA and plug 

the other end of the lead into the receiver’s DATA port. 

NOTICE: Route and secure the antenna away from any metallic or conductive 

materials to give the best range.

At this point the internal telemetry including the flight log data and the receiver 

pack voltage is fully functional.

Before continuing, bind the system to the transmitter and confirm the telemetry 

system is functioning. 

To Bind the Telemetry Module and Receiver

1. Press and hold the bind button on the side of the TM1000 telemetry module. 

2. While depressing the bind button, power the receiver. The main receiver, 

all attached remote receivers and the TM1000 telemetry module will blink 

indicating the system is in bind mode. 

3. With the stick and switches in the desired failsafe positions (normally low 

throttle and neutral sticks), put the transmitter into bind mode.

4. The main screen displays the receiver type. After several seconds, the 

system connects and reverts to the main screen.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 19

5. From the main screen rotate the roller to access the telemetry screen and 

verify the flight log data and receiver voltage displays. 

Temperature, Voltage and Optional RPM Sensors

The TM1000 includes a temperature and external voltage sensors. Optional RPM 

sensors are available for Gas/Glow and electric brushless models to monitor RPM. 

Temperature Sensor

To monitor the temperature of most any component, secure the sensor on the 

object. It must come into contact with the surface to get an accurate temperature 

reading. You can loop the temperature sensor around the engine’s cylinder head 

to assist in tuning an engine. To monitor battery temperature, you can wrap the 

sensor around the battery. 

The mounting position of the sensor, especially on gas or glow engines, will 

result in different temperature readings. So it’s important to experiment with 

different positions. 

Installation

Insert the temperature sensor connector into the port labeled TEMP/VOLT. 

The temperature sensor is now active and the actual temperature displays 

on screen. 

External Voltage

External voltage telemetry is commonly used to monitor flight pack voltage or 

you can monitor ignition batteries on gas engine equipped aircraft. You can set 

warnings to prevent over-discharging batteries. 

Installation

Plug the connector of the voltage sensor into the TEMP/VOLT port in the 

Telemetry module. 

Attach the opposite ends of the voltage sensor (stripped wires) to the 

voltage source you wish to monitor. 

Note the polarity (Red = + positive /Black = - Negative). 

Typically, you can solder the wires to the battery connector. At this point the 

External voltage displays on the telemetry screen. 

Note: A Y-harness is provided if you want to use temperature and voltage 

sensors simultaneously.

RPM (optional sensor sold separately)

Two RPM sensors are available: SPMA9569 for nitro and gas engines, 

SPMA9558 for brushless electric motors.

Engine RPM Sensor 

The optional engine RPM sensor mounts inside the backplate of aircraft engines. 

The sensor picks up the crankpin as the engine rotates giving accurate RPM. 

Additionally, you can use this sensor as an RPM pickup on any rotating gear/

collar or shaft that has a steel setscrew or other magnetic metal by locating the 

sensor within 5 mm of the rotating steel object. 

Note: On some engines you may need to space the sensor further away 

from the backplate. The sensor picks up the crankpin only; on some 

engines if the sensor is too close, it will not distinguish the crankpin from 

the crank weight. 

Installation

Install the backplate sensor in the backplate. 

Install the connector into the RPM port in the TM1000. 

Testing

Turn the transmitter and receiver on and scroll to the RPM telemetry screen. 

Rotate the engine rapidly and the RPM should register on the screen. 

The RED LED on the TM1000 indicates the sensor is picking up properly. 

You may need to adjust the sensor’s position to optimize the pickup. Move 

the sensor closer or farther away until you have a reliable RPM pickup. 

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20 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Electric RPM Sensor 

The optional electric RPM sensor is designed to be used with any brushless 

motor. The sensor has two leads to attach to any two of the three motor wires. 

This is typically done by soldering. 

Installation

To install the electric RPM sensor using servo tape, attach the sensor in 

a convenient place that allows the leads to reach the motor wires and the 

TM1000 telemetry unit. 

Solder the two sensor wires to any two motor leads. 

Plug the sensor lead into the RPM port on the TM1000 telemetry module. 

Testing

Turn the transmitter and receiver on and scroll to the RPM telemetry screen. 

Run the motor and the RPM should register on the screen. 

The RED LED on the TM1000 indicates the sensor is picking up properly. 

NOTICE: It is necessary to program a matching pole count in the telemetry 

RPM screen to have accurate reading on screen. The motor’s pole count is 

normally in the motor manufacturer’s instructions or on the manufacturer’s 

website.

Frame Rate 

The Frame Rate function allows the selection of 11ms or 22ms frame rate. When 

a 11ms frame rate receiver is used, the transmitter defaults to 11ms frame rate. 

This fast frame rate is not compatable with some types of analog servos and the 

Frame Rate screen allows the selection of a 22ms frame rate when a high frame 

rate receiver is being used with analog servos. 

To access the Frame rate Function

Press and hold the roller while turning on the the transmitter. When system setup 

appears on screen relese the roller. The DX8 is now in System Setup mode. 

Rotate the roller to highlight Frame Rate then press. 

The following screen appears:

Rotate the roller to highlight the frame rate then press. Now rotate the roller to 

select 11ms or 22 ms frame rate. 

Trainer 

The DX8 features a programmable trainer function with three trainer modes. The 

transmitter assigns the trainer function to the trainer button. The function activates 

when the switch is depressed and one of the three trainer modes is selected. The 

three trainer Modes include:

 Inhibit

In Inhibit you can use the transmitter as a slave only. However, the slave 

transmitter must have the same programming as the master (e.g., servo 

reversing, travel adjust, sub-trim, trims). 

 Programmable Master

With Programmable Master you can program the transmitter to transfer any or 

all channels when you activate the trainer switch. This is ideal for beginners 

so the student learns control of individual channels (aileron only for example) 

while the trainer maintains control of all other channels. 

Note: When Programmable Master is selected for the master transmitter, 

all settings for the slave transmitter (i.e. Servo reversing, wing type, Sub 

trim, Travel Adjust, Mixing, etc.) must match the master’s transmitter 

programming. If two DX8’s are being used simply copy and transfer the 

model memory using the SD card from the master’s model to the slave. 

The slave transmitter is then programmed to inhibit in the trainer screen. 

 Pilot Link Master

When Pilot Link Master is selected the slave transmitter has control of the 

stick function only (aileron, elevator rudder and throttle) while the master 

maintains control of all other channels and functions including D/R and 

switch positions. This is ideal for complex models as the master maintains 

control of all secondary functions and controls all other channels.

 Slave

Use Slave mode when flying with the DX8 as a slave when the master 

radio has activated its Pilot Link. In this case, there is no need to match 

programming between the slave and master transmitter.

System Settings 

Use the System Setting screen to establish the overall transmitter setting that will 

apply to ALL model memories. These settings include: User Name, Contrast, 

Mode, Region and Language. If you select Mode One, then Mode One will be 

selected for all 30 model memories. Note: Even when models are imported from 

an SD card the system settings in the transmitter will remain. 

To Access the System Settings Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Highlight System Settings then press. The following screen appears:

Highlight the function you wish to change then press the roller to select. 

User Name

User Name allows the identification of the owner to be programmed into the 

transmitter. The user name appears during the startup process at the lower left 

corner of the startup screen.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 21

To Program a User Name

In the Systems Settings screen rotate the roller to highlight User Name then 

press. 

Highlight the desired character position then press the roller to access that 

position. Rotate the roller to change to the desired character. Press to accept.

Repeat the process until the name is complete. Note that the User Name displays 

on the lower left of the startup screen. 

To Adjust Contrast

In the Systems Settings screen rotate the roller to highlight User Contrast then press. 

Rotate the roller to adjust the contrast (from 1 to 20) noting it on screen. 

Press to accept.

To Select a Mode

For Mode Conversion, please see page 39-40. 

To Select a Region–EU Version Only

In the Systems Settings screen rotate the roller to highlight Region then press 

the roller to select the Region function. Note that two regions are available for EU 

radios only. EU328 (compliant for European countries) and FR328 compliant for 

France. US radios are fixed to US-247 USA compliant.

Rotate the roller to select the desired Region based on where the radio will be 

used. With Region selected, press the roller to accept that region. 

To Select a Language

In the Systems Settings screen rotate the roller to highlight Language then press 

the roller to select the Language function. Note that five Languages are available, 

English, German, Spanish, French, and Italian. 

Rotate the roller to select the desired Language. When the desired Language is 

selected, press the roller to accept that Language. 

Transfer SD Card 

The SD Card allows the following:

• Importing (copying) a single model from one DX8 to another

• Importing (copying) all models from one DX8 to another.

• Exporting (transferring) a single model to another DX8

• Exporting (transferring) all the stored models to another DX8.

• Updating firmware

To Access the Transfer SD card Function

Press and hold the roller while turning on the transmitter. When System

Setup appears on the screen, release the roller. The DX8 is now in

System Setup Mode.

Rotate the roller to highlight Transfer SD Card then press. 

The following screen appears:

If not already done, insert an SD card in the SD card slot on the left side of the 

transmitter with the label facing forward.

The screen should now read Status Ready. 

To import a model or all models on the SD card, select Import Model or Import 

All Models then press the roller. Now select the specific model and press the 

roller or press Import to import all model memories. Use the same procedure to 

export a model or to export all models by selecting these other options.

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22 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Function Mode

The DX8 organizes the programming screens in two separate categories: System 

Setup Mode and Functions Mode. Function Mode programming adjusts a 

model’s flight characteristics at the field. 

 Airplane Model Helicopter Model

Servo Setup page 22 Servo Setup page 22

D/R and Exponential page 23 D/R and Exponential page 23

Differential page 24 Throttle Cut page 25

Throttle Cut page 25 Throttle Curve page 26

Throttle Curve page 25 Swashplate page 27

Flap System page 26 Governor page 28

Mixing page 29 Pitch Curve page 28

Aileron to Rudder Mix page 29 Tail Curve- For Non-Heading 

Programmable Mixes page 29 Hold Gyro Use Only page 30

Timer page 33 Mixing page 31

Monitor page 35 Gyro page 33

 Timer page 33

 Monitor page 35

To Access the Function List

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

To Access a Function List Screen from the Function List

Highlight the desired function then press the roller to access that function. The 

selected function screen appears:

Servo Setup 

Servo Setup adjusts the servo reverse, travel adjust, sub-trim and servo speed for 

all eight channels. Servo Setup screens feature a servo monitor that allows easy 

visual reference when making adjustments.

Travel Adjust - Allows the adjustment of servo throw/travel in each direction

Sub-trim - Typically used to center the servo position

Reverse - Changes the direction of the servo/channel

Speed - Adjusts individual servo speed 

To Access the Travel Function 

With the transmitter on and the main or telemetry screen up, press the roller. The 

Function list displays. Rotate the roller to highlight Servo Setup then press. Servo 

travel will automatically be highlighted. Press to enter the Travel function. 

Highlight the channel then press the roller. Rotate the roller to access the channel 

you wish to adjust then press to accept. 

Highlight the values at the bottom of the screen. When you center the 

corresponding stick both values are highlighted and will adjust simultaneously. 

Moving the stick or switch in the desired position adjusts that direction of travel 

independently. With the desired value(s) highlighted, rotate the roller to adjust the 

travel for the selected channel. Then press to accept. 

To Access the Sub Trim Function 

With the transmitter on and the main or telemetry screen up, press the roller. The 

Function list displays. Rotate the roller to highlight Servo Setup then press. Servo 

travel will automatically be highlighted. Rotate the roller until Sub-Trim appears in 

the channel position then press to enter the function. 

Highlight the channel then press the roller. Rotate the roller to access the channel 

you wish to adjust. Press to accept.

Highlight the value at the bottom of the screen then press the roller to access the 

Sub-Trim Value. Rotate the roller to adjust the Sub-Trim value for the selected 

channel. Then press to accept. 

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 23

To Access the Reverse Function 

With the transmitter on and the main or telemetry screen up, press the roller. 

Note: Your aircraft manual may refer to this as changing transmitter flight 

control directions in the Control Test/Reverse Controls section.

Highlight Travel then rotate the roller to access the Reversing screen. 

Highlight the channel desired and press the roller to select.

Highlight the REV NOR function then press the roller to access. Press the roller to 

toggle between NOR and REV.

To Access the Speed Function 

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays. Rotate the roller to highlight Servo Setup then 

press to access the Servo Setup screens. Servo travel will be highlighted. Rotate 

the roller until Speed appears in the channel position then press to enter. 

Highlight the channel then press the roller. Rotate the roller to access the channel 

you wish to adjust. Press the roller to accept.

Highlight the Speed value at the bottom of the screen and press the roller to 

access. With the Speed value highlighted rotate the roller to adjust the servo 

speed for the selected channel. Press the roller to accept the value. 

D/R & Exponential 

Dual Rates and exponentials are available on the aileron, elevator and rudder 

channels. You can assign them to numerous switches including the flight mode 

switch. 

 Dual Rate

Affects the overall travel which in turn affects control response 

sensitivity equally throughout the range of that channel. Reducing 

the dual rate reduces the maximum control rate as well as overall 

sensitivity.

 Exponential

Affects the sensitivity around center but has no affect on the overall 

travel. Positive Exponential reduces control sensitivity around neutral 

for more precise control but does not affect the maximum control response. 

Note: Positive and negative exponential values are available. A positive 

expo value reduces control sensitivity around center. It does not affect 

maximum travel and is recommended. Negative exponential values 

increase sensitivity around neutral and is seldom used.

To Access the D/R and Expo Function 

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list will display.

Rotate the roller to highlight D/R and Expo then press to access. 

To Select a Channel 

Highlight the channel then press the roller to access. Rotate the roller to select the 

aileron, elevator or rudder channel. Press to accept. 

You can return to the Function List screen at anytime by 

pressing the Back button on the transmitter once.

To return to the Main screen press the Back button on the 

transmitter twice or press and hold the Roller for more than 

three seconds.

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24 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

To Select Switch

Rotate the roller to highlight Sw (switch) then press to access the switch options. 

Select the desired switch to change the dual rate for that channel or inhibit then 

press the roller to make it active. 

Note: You can assign multiple channels to a single switch to affect the 

dual and exponential rates of all.

To Select Switch Position to Adjust

Note Pos: Pos 0 in the center of the screen. Move the switch displayed at the 

bottom of the screen to one of three positions from 0,1,2. When you make D/R or 

Expo adjustments, values are assigned and automatically active when the switch 

is in that position (Pos 0, 1or 2).

To Select D/R and Expo Values

Confirm that the desired channel and switch position are selected. Rotate 

the roller to highlight the D/R or Expo value then press to access. When the 

corresponding channel’s control stick is centered both values are highlighted. If 

you move the control stick to its endpoint, only one value will be highlighted. 

This allows the D/R or Expo value in that direction only to change. With the 

desired value selected, rotate the roller to select. 

Differential 

The Differential function provides precise adjustments of up/down aileron travel 

of each aileron (or elevon if Delta wing is activated). Typically, you can use 

Aileron differential to reduce unwanted yaw characteristics. In aerobatic airplanes 

adjusting differential provides an axial roll (minimum displacement of yaw 

during a roll). You can program up to three Differential values and assign them 

to a switch. Note that positive + and negative – differential is available; however, 

normally more up aileron travel is required than down aileron. 

Note: The Differential function is only available if Dual Aileron, Flaperon, 

2 ailerons 1 flap, 2 ailerons 2 flaps or Elevon is selected in Wing Type 

(see page 13) and each aileron servo is controlled by its own channel.

To Access the Differential Screen

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Differential then press. 

Differential defaults to Inhibit. Press the roller to highlight Inhibit then select one 

of the following switch positions:

Inhibit - Off

On - Always on

Gear - Gear Switch

Flap - Flap switch

Ail D/R - Aileron Dual rate switch

Ele D/R - Elevator Dual rate switch

Rud D/R - Rudder dual rate switch

F Mode - Flight Mode switch

AUX 2 - Aux 2 switch

Mix - Mix switch

Press the roller to accept the desired switch. The differential adjustment screen 

displays.

Highlight the desired differential position/value and press the roller to access. 

Rotate the roller to change the value then press the roller. Repeat for all switch 

positions desired.

Positive differential values provide more up than down aileron travel. Negative 

differential values provide more down than up travel. The differential values 

screen also allows you to select/change switch positions. Use the roller to 

highlight SW then rotate to change to the desired switch position or inhibit the 

function. 

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 25

Throttle Cut 

The Throttle Cut function allows you to shut off an engine with the Trainer switch, 

Gear switch or the Right or Left trimmer. When you activate the programmed 

switch, the throttle channel is driven to it’s preprogrammed value normally off. 

This effectively kills the engine. Release the programmed throttle cut switch/

trimmer, and normal throttle operation resumes. 

To Activate Throttle Cut and Assign it to a Switch or Trimmer

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Throttle Cut then press to access the Throttle Cut 

screen. 

Highlight Inhibit then press the roller to access the switch options.

Rotate the roller to the desired switch to cut the throttle (Trainer, Gear, Mix , L trim 

or R trim) then press the roller to program that switch. 

Program a Throttle Cut position. Note that 0%= low throttle, mid trim and 

negative values are available. To test the Throttle Cut function, activate the 

programmed switch. Note the throttle servo position or the position of the throttle 

channel in the servo monitor. The system should drive the servo position to the 

low throttle position when you activate Throttle Cut. 

Throttle Curve 

The Throttle Curve function allows throttle output vs. input positions to be 

adjusted. This is typically used to alter the throttle response to give a linear rate 

or to adjust the throttle response sensitivity when hovering or torque rolling. You 

can program a single curve (switch to On) or up to three curves and select them 

via a programmed switch. The screen displays a graphic 5-point throttle curve on 

its left side to aid in selecting throttle curve values. An Expo function is available 

that smoothes out the Throttle curve.

To Program the Throttle Curve Function

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Throttle Curve then press the roller to access the 

Throttle Curve screen. 

Selecting a Switch

Rotate the roller to highlight Switch then press the roller to access the switch 

options.

Choose the desired switch to change to different throttle curves or select On if you 

only want one curve to always be active. 

Adjusting the Curve

With the switch listed at the bottom of the screen in the position desired for this 

curve, rotate the roller to highlight one of the five available throttle curve values 

(Low, 25%, 50%,75, High). Press the roller to access.

Rotate the roller to adjust the selected point to desired output. Note the position 

on the graph at the left of the screen. 

Repeat this for all desired points.

Note: if you select a switch position in Throttle Curve, move the switch 

to the remaining position(s) and adjust the throttle curve values for those 

switch positions. 

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26 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

To Activate the Expo Function 

Rotate the roller to highlight EXPO then press the roller to access the Throttle 

Curve Expo function. Select Inh or Act to inhibit or activate the Expo function then 

press to accept. 

Throttle Curve 

The DX8 features a 5-point throttle curve. You can assign up to four separate 

throttle curves. A graph displays at the left side of the screen to aid in adjusting 

throttle curves. An Expo function is also available that smoothes out the curve. 

To Program Throttle Curves

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Throttle Curve then press to access that screen. 

Selecting a Flight Mode

Highlight the desired flight mode at the top of the screen then press the roller to 

select. The selected flight mode will darken confirming your selection. 

N= Normal

1= Stunt 1

2= Stunt 2

H= hold

Adjusting the Curve

Move the flight mode switch in the position you wish to adjust. Rotate the roller 

to highlight one of the five available throttle curve values (Low, 25%, 50%, 75%, 

High). Press the roller to access that value.

Rotate the roller to adjust the selected point to the desired output position. Note 

the position on the graph at the left of the screen. 

Repeat this for all desired points.

To Activate the Expo Function 

Rotate the roller to highlight EXPO then press to access the Throttle Curve Expo 

function. Select Inh or Act to inhibit or activate the Expo function. Press the roller 

to accept. 

Flap System 

The DX8 flap system offers up to three programmable flap and elevator positions 

(normal, mid and land). You can assign them to a variety of switches. You can 

program a Speed function to slow flap and elevator compensation travel for a 

scale effect. A graphic display on the left side of the Flap System screen provides 

a visual display of servo position aiding in setting up and adjusting the flaps. 

Note: The Flap function is only available on wing types with flaps. (see 

Wing Type page 15) 

To Activate the Flap Function

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 27

Rotate the roller to highlight Flap System then press. 

To Select a Switch 

The Flap System defaults to Inhibit. To activate the Flap System, rotate the roller 

to highlight Inhibit then press to access the switch function. Rotate the roller to 

the desired Flaps control switch. Press to access that screen. 

Setting Flap and Elevator Positions

Rotate the roller to select desired Flap positions value then press the roller to

access that value. Now rotate to adjust the flap position value. Note: it is 

recommended that the flap switch position match the flap adjustment that 

is being adjusted. This will allow you to observe the effects of the flap adjustment. 

Repeat this for all desired Flap and elevator positions (Normal, mid and land).

Adjusting the Flap Speed

Rotate the roller to select Speed then press. Now rotate the roller to adjust the 

flap speed. Press the roller to accept. The flap speed affects the flap and elevator 

compensation. The flap and elevator will reach their flap positions at the same time.

Swashplate 

The Swashplate screen adjusts the amount and direction of travel for the aileron, 

elevator and pitch functions when you activate CCPM mixing in Swash Type (see 

pages 15-16). This screen also allows an Expo function that compensates for the 

effect of the servo’s rotation at extremes of travel. An E-ring function also prevents 

servo over-travel when simultaneous extreme aileron and elevator inputs are given. 

Unless using a linear servo or a type of linkage that eliminates this effect, you 

should turn on the Expo function when any CCPM mix is enabled. Swashplate 

values increase or decrease the overall control travel of the selected channel. For 

example if you increase Pitch value, the travel of all three servos that control pitch 

will increase. If you increase aileron, the aileron and pitch servos will increase. 

Increasing or decreasing this value affects the travel of that function and not the 

individual servo. Note: Negative and positive swashplate values are available. 

To achieve the correct travel direction for Aileron, Elevator and Pitch, first use 

the reversing function to set the servo direction on the aileron, elevator and pitch 

channels. Do this so that when an aileron input on the transmitter’s stick tilts the 

swashplate right and left, an elevator input tilts the swashplate fore and aft, and a 

pitch input raises and lowers the swashplate. You synchronize the outputs with this 

function. Then you can adjust swashplate values positively or negatively to achieve 

the overall correct travel direction for aileron, elevator and pitch.

To Access the Swashplate Function 

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Swashplate then press to access. 

To adjust a Swashplate Value

Highlight the desired function (Aileron, Elevator or Pitch) then press the roller to 

access.

Rotate the roller to change the Swashplate value, noting that positive and negative 

values are available. Press the roller to accept. 

Repeat the above process for all three cyclic inputs (aileron, elevator and pitch).

To Activate the Swashplate Expo Function 

Rotate the roller to highlight EXPO then press to access. Spress the roller to 

toggle between ACT and INH.

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28 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

To Activate the Swashplate E-Ring Function 

Highlight E-ring then press the roller to access the Electronic Cyclic Ring 

function. 

Governor 

The Governor function adjusts engine rpm when using a Governor or throttle 

limiter. You can program up to four governor values to be selected from a variety 

of switches including the flight mode switch. You can adjust Governor values in 

.5% increments to allow for precise rpm adjustments. Also, you can program the 

channel the governor controls. 

To Activate the Governor Function

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Governor then press to access that screen. 

To Select a Switch 

The Governor function defaults to Inhibit. To activate the Governor function, rotate 

the roller to highlight Inhibit; then, press to access the switch function. Select 

the desired switch to control the governor then press the roller to access the 

Governor screen. 

Assigning a Channel- (Output)

In this screen you can assign the receiver channel the Governor is plugged into. 

The governor and the gyro must use two different channels. If the gyro function 

uses a channel, it will not appear in the governor list. 

Rotate the roller to highlight Ch: (channel) then press to access that function. 

Select the channel the governor will be plugged into. Normally Aux 2 is used.

 

Adjusting the Governor Values

Rotate the roller to select the desired governor value. Press to access. Rotate to 

adjust the value. 

Note: the displayed value is the corrected governor value. 0% represents 

1.500ms or off with most governors. 

Repeat this for all desired governor values.

Pitch Curve 

The DX8 features a 5-point Pitch curve. You can set up to four separate Pitch 

curves. A graph displays at the left side of the screen to aid in adjusting pitch 

curves. An Expo function is available that smooths out the curve. 

To Program Pitch Curves

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Pitch Curve then press.

Selecting a Flight Mode

Highlight the desired flight mode at the top of the screen. Press the roller to 

select. The selected flight mode will darken to confirm the selection. 

N= Normal

1= Stunt 1

2= Stunt 2

H= hold

Adjusting the Curve

Move the flight mode switch in the position you wish to adjust. Rotate the roller 

to highlight one of the five available pitch curve values (Low, 25%, 50%,75%, 

High). Press to access that value.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 29

Rotate the roller to adjust the selected point to the desired output position. Note 

the position on the graph at the left of the screen.

Repeat this for all desired points.

To Activate the Expo Function 

Highlight EXPO then press the roller to access the Pitch Curve Expo function. 

Select Inh or Act to inhibit or activate the Expo function. Press the roller to accept. 

Mixing 

The DX8 offers eight mixes in airplane model type. There is an Elevator to Flap 

mix, Aileron to Rudder mix, and six user-programmable mixes that allow the 

mixing of any channel to any other channel. Programmable mixes include a trim 

offset function that adjusts the mix crossover point and a trim include function 

that applies the master’s trim to the slave channel. You can assign Mixes to the 

following switches or flight modes:

Inhibit- Off

On - Always on

Gear - Gear switch

Ail - Aileron dual rate switch

Ele - Elevator dual rate switch

Rud - Rudder dual rate switch

FM1 - Flight mode 1

FM2 - Flight mode 2

FM1, 2 - Flight mode 1 and 2

Mid - Flap switch mid position

Land - Flap switch land position

To Access the Mixing Functions

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Mixing then press. Note that the Elevator to Flap mix 

appears on the screen if the appropriate wing type is selected. 

Aileron to Rudder Mix 

Use Aileron to Rudder mixing to overcome adverse yaw characteristics with 

certain types of aircraft such as the J3 Cub and make coordinating turns easier. 

To access Aileron to Rudder Mix 

IIf you accessed the flap option in wing type in the system setup mode, the 

elevator to flap mix will display. Rotate the roller to highlight ELE > FLP then 

press. Now rotate the roller to select Ail > RUD and press. The aileron to rudder 

Mix screen appears. 

Assigning Aileron to Rudder Mix to a Switch 

Rotate the roller to highlight Sw: at the bottom of the screen. Press the roller to 

access the switch select function then select the desired switch to turn on/off the 

aileron to rudder mix. If you select On, the mix will always be on. 

Adjusting Aileron to Rudder Mix Rates

Rotate the roller to highlight the rate values then press. Note that both rates are 

boxed. Moving the aileron stick right or left causes the right or left value only to 

be highlighted so you can adjust the values individually. Move the aileron stick 

in position to highlight the desired rates then rotate the roller to adjust the value. 

Note that positive + and negative - values reverse the direction of the mix. Press 

the roller to accept the rate.

Verify the aileron to rudder mix is working properly and in the correct direction by 

placing the active switch in the active position and moving the aileron stick noting 

the rudder position. If the rudder moves in the opposite direction than desired, 

the opposite value (positive vs. negative value) is needed. 

Note: the Elevator to Flap mix operates in the same fashion as alieron to 

rudder mix.

Programmable Mixes 

Programmable mixes allow any channel to be mixed to any other channel or to 

itself. Popular programmable mixes include rudder to steerable nose wheel, dual 

rudder mix, dual elevator mix, rudder to aileron and rudder to elevator mix for 

knife edge correction. 

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30 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

To Access Programmable Mixes (1 thru 6) 

With the Elevator to Flap mix screen displayed, rotate the roller to highlight Ele > 

Flp then press the roller. Now rotate the roller to select programmable Mix, 1, 2, 

3, 4, 5, or 6 and press the roller. The Mix screen appears. 

To Select Master and Slave Channels

The Master channel is the controlling channel. The slave is the channel, the 

master will be mixed to. The slave channel will follow the master channels input 

based on the rate that is programmed.

Rotate the roller to highlight the left INH then press the roller to access the master 

channel. Rotate the roller to select the desired master channel. When selected, 

press the roller to accept that master channel. 

Rotate the roller to highlight the right INH then press the roller to access the slave 

channel. Rotate the roller to select the desired slave channel. When selected, 

press the roller to accept that slave channel. 

Assigning a Programmable Mix to a Switch 

Rotate the roller to highlight Sw: at the bottom of the screen. Press the roller to 

access the switch select function then select the desired switch to turn on/off the 

aileron to rudder mix. If you select On, the mix will always be on. 

Adjusting Programmable Mix Rates

Rotate the roller to highlight the desired rate then press the roller to highlight that 

rate. Rotate the roller to adjust the value. You can reverse the direction of the slave 

channel with positive + and negative - values.

Adjust the rate for all both directions/values. 

To verify that the programmable mix is working properly and in the correct 

direction, place the correlating switch in the active positions, move the 

programmed master channel and observe the slave channel. The slave channel 

should move accordingly. 

Offset

The offset function establishes the point at which the two mix rates converge. 

Typically this rate is center or 0%. If an offset is needed do the following:

Programming an Offset

Rotate the roller to highlight Offset then press the roller to highlight the Offset 

rate. Rotate the roller to adjust the value. Positive + and negative - values are 

available shifting the offset in either direction. Press the roller to accept the offset 

value.

Trim Include

The trim include function applies trim to the slave channel when the master 

channel you select is a channel that has trim (throttle, aileron, elevator and 

rudder). Typically, this is used when more than one channel is used to operate a 

primary control surface (dual rudder servos, etc.) With trim include activated, the 

master channel’s trim affects the master and slave channels.

Activating Trim Include

Rotate the roller to highlight Trim. Press the roller to toggle between INH and ACT.

Tail Curve- For non-Heading

Hold Gyro Use Only 

The Tail Curve programming functions nearly identically to the Throttle and Pitch 

curve programming. You can assign four separate Tail curves or a common Tail 

curve to 2 or more flight modes. A graph displays at the left side of the screen to 

help you adjust the Tail curves. An Expo function is available that smooths out 

the curve.

Note: Only use tail curves when the gyro is in the conventional gain (nonheading hold) mode.

To Program Tail Curves

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays. 

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 31

Rotate the roller to highlight Tail Curve then press. 

Selecting a Flight Mode

Highlight the desired flight mode at the bottom of the screen then press to select. 

Note that the selected flight mode will darken confirming the selection. 

N= Normal

1= Stunt 1

2= Stunt 2

H= hold

Adjusting the Curve

Move the flight mode switch in the position you wish to adjust the curve to. 

Highlight one of the five available Pitch curve values (Low, 25%, 50%,75%, 

High). Press the roller to access that value.

Rotate the roller to adjust the selected point to the desired output position. Note 

the position on the graph at the left of the screen. 

Repeat this for all desired points.

To Activate the Expo Function 

Rotate the roller to highlight EXPO then press to toggle between INH and ACT. 

Mixing 

The DX8 offers eight mixes in helicopter model type. You can program a cyclicto-throttle mix to advance the throttle when aileron, elevator and or rudder inputs 

are given. This prevents rpm decay during cyclic and rudder inputs. A Swashplate 

Mix mixes Aileron to Elevator and Elevator to Aileron to adjust swashplate timing. 

Six programmable mixes allow the mixing of any channel to any other channel. 

You can assign Mixes to activate in various flight modes as well as with the gear 

switch. Programmable mixes include a trim offset function that adjusts the mix 

crossover point and a trim include function that applies the master’s trim to the 

slave channel. 

To Access the Mixing Functions

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Mixing then press. The Cyclic to throttle mix appears 

on the screen. 

Cyclic-to-Throttle Mix

Cyclic-to-throttle mix prevents rpm decay when aileron, elevator and or rudder 

inputs are given. This mix advances the throttle position with cyclic or rudder 

control to maintain rpm. At full throttle, programming prevents the throttle from 

overdriving the servo. 

Important: When using a governor, Cyclic to throttle mix is not recommended.

Assigning Cyclic Mix to a Flight Mode(s) 

Rotate the roller to highlight the desired box at the bottom of the screen. Press the 

roller to darken the box and activate Cyclic Mix in that flight mode position. You 

can highlight more than one flight mode position. If all boxes are highlighted, the 

C Mix function is always on. If no boxes are highlighted, the function is always off.

N= Normal

1= Stunt 1

2= Stunt 2

H= Hold

M=Mix

Adjusting Cyclic Mix Rates

Rotate the roller to highlight the desired rate then press. Rotate the roller to adjust 

the value. The available positive + and negative - values reverse the direction of 

the throttle mix.

Adjust the rates for all desired channels. 

To verify that Cyclic mix is working properly and in the correct direction, place the 

flight mode switch in one of the active positions. Move the programmed cyclic or 

rudder channel noting the throttle position. The throttle position should increase. 

If it decreases then the opposite value (positive vs. negative) is needed. 

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32 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Swashplate Mix

The Swashplate Mix typically corrects swashplate timing issues by mixing Aileron 

to Elevator and Elevator to Aileron. When adjusted correctly, the Swashplate 

causes the helicopter to roll and pitch accurately with minimal inter-reaction.

To access Swashplate Mix 

With the C Mix screen displayed, rotate the roller to highlight Cyclic > Thro then 

press. Select Swashplate and press the roller. The Swashplate Mix screen appears. 

Assigning Swashplate Mix to a Flight Mode(s) 

Rotate the roller to highlight the desired box at the bottom of the screen. Press the 

roller to darken the box activating Swash Mix in that flight mode position. You can 

highlight more than one flight mode position. If all boxes are highlighted, the C 

Mix function is always on. If no boxes are highlighted, the function is always off. 

N= Normal

1= Stunt 1

2= Stunt 2

H= Hold

M=Mix

Adjusting Swashplate Rates

Rotate the roller to highlight the desired rate then press. Rotate the roller to adjust 

the value. You can reverse the direction of the slave channel with positive + and 

negative – values. Adjust the rate for all desired Swashplate values. 

Verify that the Swash mix is working properly and in the correct direction by 

placing the flight mode switch in one of the active positions. Then, move the 

programmed cyclic master channel aileron or elevator to its full travel and hold 

this position. Now change the flight mode to a position that the swash mix is 

inactive in. Note the movement of the slave channel on the left side of the monitor. 

Programmable Mixes

Programmable mixes allow any channel to be mixed to any other channel or to 

itself. With helicopters Programmable mixes typically operate scale functions like 

retracts, lights, etc.

To Access Programmable Mixes (1 thru 6) 

With the C Mix screen displayed, rotate the roller to highlight Cyclic > Thro, then 

press the roller. Select programmable Mix, 1, 2, 3, 4, 5, or 6 and press the roller. 

The Mix screen appears. 

To Select Master and Slave Channels

The Master channel is the controlling channel and is mixed to the slave channel. 

The slave channel follows the master channel’s input based on the rate that is 

programmed.

Rotate the roller to highlight the left INH then press to access the master channel. 

Select the desired master channel. Press the roller to accept. 

Highlight the right INH then press the roller to access the slave channel. Select 

the desired slave channel. Press the roller to accept. 

Assigning a Programmable Mix to a Flight Mode(s) 

Highlight the desired box at the bottom of the screen. Press the roller to darken 

the box activating programmable mix in that flight mode position. Note you can 

highlight more than one flight mode position. If you highlight all boxes, the 

programmable mix function is always n. If no boxes are highlighted, the function 

is always off. 

N= Normal 1= Stunt 1

2= Stunt 2 H= Hold

M=Mix

Adjusting Programmable Mix Rates

Rotate the roller to highlight the desired rate then press. Rotate the roller to adjust 

the value. You can reverse the direction of the slave channel with positive and 

negative values. Adjust the rate for both directions/values. 

You should verify that the programmable mix is working properly and in the 

correct direction. Place the flight mode switch in one of the active positions. 

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 33

Move the programmed master channel while observing the slave channel. The 

slave channel should move accordingly. 

 

Offset

The Offset function establishes the point at which the two mix rates converge. 

Typically, this rate is center or 0%. If an offset is needed (normally not in a 

helicopter), do the following.

Programming an Offset

Rotate the roller to highlight Offset then press. Rotate the roller to adjust the value. 

Positive + and negative - values shift the offset in either direction. Press the roller 

to accept. 

Trim Include

The trim include function applies trim to the slave channel when the selected 

master channel has trim (throttle, aileron, elevator and rudder). Typically this 

is used when more than one channel operates a primary control surface (dual 

aileron servos, etc.) With trim include activated, the master channel’s trim affects 

the slave channel’s trim as well.

Activating Trim Include

Rotate the roller to highlight Trim then press. Press the roller to toggle between 

INH and ACT. 

Gyro 

Use the Gyro function to program and adjust gyro gain. You can program up to 

four gyro gain values to be selected from a variety of switches including the flight 

mode switch. You can adjust gyro gain values in .5% increments allowing for 

precise gain adjustments. Also, you can program the channel the gyro gain is 

controlling. The DX8 displays gyro gain values as N for Normal gain and a T for 

tail lock (heading hold). The percentage values are the true gain values in each 

mode. 

To Activate the Gyro Gain Function

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Gyro then press to access that screen. 

To Select a Switch 

The Gyro function defaults to Inhibit. To activate the Gyro function, highlight 

Inhibit, then press the roller to access the switch function. Rotate the roller to 

access the desired gyro control switch. Press the roller to access the Gyro gain 

screen. 

Assigning a Channel- (Output)

You can assign the receiver channel the gyro gain is plugged into in this screen. 

The governor and the gyro must use two different channels. A channel used by 

the governor function does not appear in the Gyro list. 

Highlight Ch: (channel) then press to access the gyro channel function. Select the 

desired channel to plug the gyro gain into, normally the Gear channel is used. 

Adjusting the Rate Values

Rotate the roller to select the desired gain value then press. Select the gain value. 

Any time a T displays, the gyro is in tail lock (Heading Lock). If an N displays, the 

gyro is in normal mode.

Repeat this for all desired gain values.

Timer 

The DX8 Timer function allows you to program a Count Down timer or Stop 

Watch (count up timer) to display on the main screen. An alarm sounds when 

the programmed time is reached. You can program the timer to start using the 

trainer switch, the left or right trimmers or automatically when throttle is raised 

above a preprogrammed position. Also, an internal timer that shows run time for 

a specific model displays on the main screen. 

To Access the Timer Screen

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list displays.

Rotate the roller to highlight Timer then press. 

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34 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

To select the Timer Mode- Inhibit, Count Down or Stop Watch

Highlight Mode then press. 

Select Inhibit, Count Down or Stop Watch. Press the roller to accept. 

To Program a Time

Rotate the roller to highlight Time then press to access. You can highlight the 

seconds or minutes. Press the roller to access minutes or second. 

Rotate the roller to select the desired time. Press to accept.

To program a Tone, Vibe, Tone/ Vibe or Inhibit

Rotate the roller to highlight Tone then press to access. You can

Select Inh. Tone, Vibe or Tone /Vibe

To Select the Timer Start Method

Rotate the roller to highlight Start then press to access. Five start options are 

available: Trainer switch, Throttle, Throttle 1-Time, L Trim and R Trim. 

Throttle 1-time - The timer starts when the programmed throttle position is 

exceeded and will continue regardless of the throttle position. 

Throttle - The timer starts when the programmed throttle position is exceeded. 

Anytime you lower the throttle below the programmed position, the timer will 

pause then continue anytime the throttle is raised above that position. (This is 

useful for flying electric models where the motor run time, not the flight time, is 

important.) 

Rotate the roller to select the desired Start method (Trainer, Throttle, Throttle 

1-Time, L Trim, R Trim). Press to accept.

Programming a Throttle Stick PositionOnly if Throttle Start is Selected

If you select Throttle or Throttle 1-Time in the Start function, the Stick appears 

below Start in the Timer screen. This is the stick position where throttle activates 

the timer. Rotate the roller to highlight Stick then press to access the Stick values. 

You can adjust the value from 0 to 100%. This correlates to the actual throttle 

stick position. 

Rotate the roller to select the desired Stick value then press the roller to accept the 

displayed value.

To Reset the Internal Timer

There are a couple of ways 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

To reset the Count Down or Stop Watch timer on the main screen, 

press the Clear button.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 35

Monitor 

The Monitor screen displays the servo positions for each channel graphically and 

numerically. This is useful to verify programming functions, trim settings, mix 

directions, etc. The numeric value is directly relative to the travel adjust and mix 

values (e.g., 100% travel adjust equals 100% value in the Monitor). 

To Access the Monitor screen

With the transmitter on and the main or telemetry screen displayed, press the 

roller. The Function list will display.

Rotate the roller to highlight Monitor then press to access. 

Problem Possible Cause Solution

• The system will not

connect

• Your transmitter and receiver are too close 

together. They should be 8 to 12 feet apart.

• You are around metal objects.

• Model selected is not the model bound to.

• Your transmitter was accidentally put into

bind mode and is not bound to your receiver 

anymore.

• Move transmitter 8 to 12 feet from receiver.

• Move to an area with less metal.

• Check model selected and ensure you are bound

to that model.

• Rebind your transmitter and receiver.

• The receiver goes into

failsafe mode a short 

distance away from the 

transmitter

• Check the receiver antenna to be sure it is not

cut or damaged.

• Main and remote receivers too close together

• Replace or contact Horizon Product Support

• Mount main and remote receivers at least 2

inches apart and perpendicular to each other.

• Receiver quits responding

during operation

• Inadequate battery voltage

• Loose or damaged wires or connectos between

battery and receiver

• Charge batteries. Spektrum receivers require

at least 3.5V to operate. An inadequate power 

supply can allow voltage to momentarily drop 

below 3.5V and cause the receiver to brown out 

and reconnect. 

• Check the wires and connection between battery

and receiver. Repair or replace wires and/or 

connectors

• Receiver loses its bind

• Transmitter stand or tray could be depressing

the bind button

• Bind button pressed before transmitter turned

on

• If stand is depressing bind button, remove from

stand and rebind.

• Rebind your system following binding

instructions

• Receiver blinking at

landing

• A brownout has occurred

• System turned on and connected then receiver

turned off without turning off transmitter

• Check battery voltage

• Turn off transmitter when receiver is turned off

• RPM won’t read/display • Sensor too close to backplate; picking up tip of

crank pin only

• Move sensors away from backplate

• Temperature sensor seems

to read low

• Temperature sensor mounted on front of

cylinder head being hit by direct prop blast

• Mount sensor behind cylinder head. When

installing sensors note engine temperature 

with engine properly tuned. Use this as 

reference value. If temperature goes above this 

significantly, the engine is running too low

DX8 Troubleshooting guide

EN
36 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

General Information

Servo Precautions • Do not lubricate servo gears or motors.

• Do not overload retract servos during retracted or extended conditions. Make

sure they are able to travel their full deflection. Overloading or stalling a servo can 

cause excessive current drain.

• Make sure all servos move freely through their rotations and no linkages

hang up or bind. A binding control linkage can cause a servo to draw excessive 

current. A stalled servo can drain a battery pack in a matter of minutes.

• Correct any control surface “buzz” or “flutter” as soon as it is noticed in flight,

as this condition

can destroy the feedback potentiometer in the servo. It may be extremely 

dangerous to ignore such “buzz” or “flutter.”

• Use the supplied rubber grommets and brass servo eyelets when mounting

your servos. Do not over-tighten the servo mounting screws, as this negates the 

dampening effect of the rubber grommets.

• Ensure the servo horn is securely fastened to the servo. Use only the servo arm

screws provided; the size is different from other manufacturers.

• Discontinue to use servo arms when they become “yellowed” or discolored.

Such servo arms may be brittle and can snap at any time, possibly causing the 

aircraft to crash.

• Check all related mounting screws and linkages frequently. Aircraft often

vibrate, causing linkages and screws to loosen.

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 piloting competency must be high enough to ensure that you are able 

to control your aircraft under all conditions. If you are a newcomer to radio 

controlled flying, please seek help from an experienced pilot or your local hobby 

store.

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 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.

 Do not operate more than 40 DSM transmitters simultaneously.

Safety Do’s and Don’ts for Pilots • Ensure that your batteries have been properly charged prior to your initial flight.

• Keep track of the time the system is turned on so you will know how long you

can safely operateyour system.

• Perform a ground range check prior to the initial flight of the day. See the “Daily

Flight Checks Section” for information.

• Check all control surfaces prior to each takeoff.

• Do not fly your model near spectators, parking areas or any other area that

could result in injury to people or damage of property.

• Do not fly during adverse weather conditions. Poor visibility can cause

disorientation and loss of control of your aircraft. Strong winds can cause similar 

problems.

• 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 flight you observe any erratic or

abnormal operation, land immediately and do not resume flight until the cause of 

the problem has been ascertained and corrected. Safety can never be taken lightly.

Federal Aviation Administration

Purpose

This advisory outlines safety standards for operations of model aircraft. We 

encourage voluntary compliance with these standards.

Background

Attention has been drawn to the increase in model aircraft operation. There is a 

need for added caution when operating free flight and radio controlled craft in 

order to avoid creating a noise nuisance or a potential hazard to full-scale aircraft 

and persons and/or property on the surface.

Operating Standards

Modelers generally are concerned with safety and exercise good judgment 

when flying model aircraft. However, in the interest of safer skies, we encourage 

operators of radio controlled and free flight models to comply with the following 

standards:

a. Exercise vigilance in locating full-scale aircraft (get help if possible) so as not 

to create a collision hazard.

b. Select an operating site at sufficient distance from populated areas so you do 

not create a noise problem or a potential hazard.

c. Do not fly higher than 400 feet above the surface.

d. Always operate more than three miles from the boundary of an airport unless 

you are given permission to be closer by the appropriate air traffic control facility 

in the case of an airport for which a control zone has been designated or by the 

airport manager in the case of other airports.

e. Do not hesitate to ask for assistance in complying with these guidelines at the 

airport traffic control tower or air route traffic control center nearest the site of 

your proposed operation.

Information Provided By

Director, Air Traffic Service Federal Aviation Administration, Washington, D.C.

Daily Flight Checks

1. Check the battery voltage on both the transmitter and the receiver battery 

packs. Do not fly below 4.3V on the transmitter or below 9V on the receiver. To do 

so can crash your aircraft.

Note: When you check these batteries, ensure that you have the polarities correct 

on your expanded scale voltmeter.

2. Check all hardware (linkages, screws, nuts, and bolts) prior to each day’s flight. 

Be sure that binding does not occur and that all parts are properly secured.

3. Ensure that all surfaces are moving in the proper manner.

4. Perform a ground range check before each day’s flying session.

5. Prior to starting your aircraft, turn off your transmitter, then turn it back on. Do 

this each time you start your aircraft. If any critical switches are on without your 

knowledge, the transmitter alarm will warn you at this time.

6. Check that all trim levers are in the proper location.

7. All servo pigtails and switch harness plugs should be secured in the receiver. 

Make sure that the switch harness moves freely in both directions.

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SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 37

Warranty and Repair Policy

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 1 year from the date of purchase by the Purchaser. 

1-Year Limited Warranty

 Horizon reserves the right to change or modify 

this warranty without notice and disclaims all 

other warranties, express or implied.

(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 all warranty 

claims. 

(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.

(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 Product 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).

WARRANTY SERVICES

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 productsupport@horizonhobby.com, 

or call 877.504.0233 toll free to speak to a Product 

Support representative. You may also find information 

on our website at www.horizonhobby.com.

Inspection or Repairs

If this Product needs to be inspected or repaired, 

please use the Horizon Online Repair Request 

submission process found on our website or call 

Horizon to obtain a Return Merchandise Authorization 

(RMA) number. 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 

EN
38 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

our facility. An Online Repair Request is available at 

www.horizonhobby.com http://www.horizonhobby.

com under the Repairs tab. If you do not have internet 

access, please contact Horizon Product Support to 

obtain a RMA number along with instructions for 

submitting your product for repair. When calling 

Horizon, you will be asked to provide your complete 

name, street address, email address and phone number 

where you can be reached during business hours. When 

sending product into Horizon, please include your RMA 

number, a list of the included items, and a brief summary 

of the problem. A copy of your original sales receipt 

must be included for warranty consideration. Be sure 

your name, address, and RMA number are clearly written 

on the outside of the shipping carton.

Notice: Do not ship batteries to Horizon. If you 

have any issue with a battery, please contact 

the appropriate Horizon Product Support office.

Warranty Inspection and Repairs

To receive warranty service, you must include 

your original sales receipt verifying the proof-ofpurchase 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.

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 1⁄2 hour of labor. In addition you will be billed for 

return freight. Horizon accepts money orders and 

cashiers checks, as well as Visa, MasterCard, American 

Express, and Discover cards. By submitting any item 

to Horizon for inspection or repair, you are agreeing to 

Horizon’s Terms and Conditions found on our website 

under the Repairs tab.

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 the party 

responsible for compliance 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.

Antenna Separation Distance

When operating your Spektrum transmitter, please be sure to maintain a 

separation distance of at least 5 cm between your body (excluding fingers, 

hands, wrists, ankles and feet) and the antenna to meet RF exposure safety 

requirements as determined by FCC regulations.

The illustrations below show the approximate 5 cm RF exposure area and 

typical hand placement when operating your Spektrum transmitter.

Country of Purchase Horizon Hobby Address Phone Number/ Email

United States Horizon Service Center

(Electronics and engines)

4105 Fieldstone Rd

Champaign, Illinois

61822 USA

877-504-0233

productsupport@horizonhobby.com

Horizon Product Support

(All other products)

4105 Fieldstone Rd

Champaign, Illinois

61822 USA

877-504-0233

productsupport@horizonhobby.com

United Kingdom Horizon Hobby Limited Units 1-4 Ployters Rd

Staple Tye

Harlow, Essex

CM18 7NS

United Kingdom

+44 (0) 1279 641 097

sales@horizonhobby.co.uk

Germany Horizon Technischer

Service

Hamburger Str. 10

25335 Elmshorn

Germany

+49 4121 46199 66

service@horizonhobby.de

France Horizon Hobby SAS 14 Rue Gustave Eiffel

Zone d’Activité du Réveil Matin

91230 Montgeron

+33 (0) 1 60 47 44 70

EN
SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 39

Compliance Information for the

European Union

The following information is for item numbers: SPM8800EU

 

The following information is for item numbers: SPM88001FR

Declaration of Conformity

(in accordance with ISO/IEC 17050-1

No. HH2010080203

Product(s): Spektrum DX8 Transmitter

Item Number(s): SPM8800EU, SPM88001FR 

Equipment class: 2

The object of declaration described above is in conformity with the 

requirements of the specifications listed below, following the provisions of 

the European R&TTE directive 1999/5/EC:

EN 60950 Safety

EN 300-328 Technical requirements for Radio equipment

EN 301 489 General EMC requirements for Radio equipment

Signed for and on behalf of:

Horizon Hobby, Inc.

Champaign, IL USA

Aug 02, 2010

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 collection 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.

Appendix

Mode Changes

The DX8 can be easily converted to mode 1, 2, 3, or 4. This conversion requires 

a mechanical and a programming change. (Stick and switch positions for mode 

1 and 2 are illustrated on pages 8 and 9.) Following are detailed instructions on 

making mode changes

Mechanical Conversion

Mechanical conversion is required to switch between modes 1 and 2 or between 

modes 3 and 4. The centering spring for elevator and the friction straps for 

throttle must be engaged on the appropriate gimbal and throttle limiting wedges 

must be swapped.

Step 1. Carefully pull back the rear grips and side rubber panels and unscrew 

the six Phillips head screws shown.

Step 2. Remove the back case noting that a wire harness connects the back 

to the main case. Carefully set the main case to the left side of the 

transmitter being careful not to damage the wire harness.

(Cages are pictured in white for clarification. The cages 

 in your transmitter are black.)

Changing Throttle Friction from One Gimbal to Another

Step 3. Locate the silver throttle friction straps on both gimbals. Two straps are 

located on each gimbal. One strap engages a serrated section on the 

gimbal giving a ratcheted throttle feel while the other strap engages a 

smooth section on the gimbal giving a smooth friction feel.

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International Operations and Risk Management

Horizon Hobby, Inc.

2155

EN
40 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Note: Cages have been removed for clarity.

Step 4. Locate the gimbal that currently has the throttle friction engaged (mode 

2 is the right gimbal from the rear). Unscrew the silver throttle tension 

screw until the friction strap is no longer in contact with the friction 

portion of the gimbal. The gimbal should now move freely. Now on 

the opposite gimbal locate the friction strap you desire (ratcheted or 

smooth). Screw in the corresponding screw until the throttle tension 

starts to engage.

Note: Cages have been removed for clarity.

Changing Elevator Centering

Note: When changing modes that require the throttle and elevator to be 

moved from one side to the other (mode 1 to mode 2 for example) it is 

recommended that that the elevator and throttle stick be held fully up or 

down while the elevator centering screw is fully tightened or loosened. 

This will reduce the load on the elevator centering mechanism making it 

easier to properly adjust the centering screw.

Step 5. Locate the gimbal that currently has the elevator centering spring 

engaged (mode two is the left gimbal from the rear). Using a Phillips 

screwdriver, fully tighten the elevator centering screw as show below. 

This disengages the elevator centering spring. Now locate the elevator 

centering screw on the opposite gimbal and back this screw out until 

the elevator centering lever is fully engaged. 

Note: Cages have been removed for clarity.

Step 6. Throttle limiting wedges are used to limit the maximum throttle travel 

for improved ergonomics. When switching modes that swap elevator 

and throttle positions the throttle limiting wedges must also be moved. 

Using a Phillips screwdriver, you will need to unscrew the two upper 

circuit boards and move these upward to access the upper inner screw 

of the cages. Now unscrew the eight Phillips screws that retain the 

cages and remove the cages. 

Step 7. Most pilots prefer having a throttle with less stroke as it provides a 

more natural feel when giving rudder commanded (mode 2) at full 

or low throttle. When changing throttle position from right to left it’s 

necessary to switch the throttle limiting wedges positions. Using a 

Phillips screwdriver remove the throttle limiting wedges from their 

current position and reinstall them on the opposite gimbal.

Step 8. Reinstall the gimbal cages and upper circuit boards, then the back of 

the transmitter. Be careful not to pinch wires or the rubber side grips. 

Tighten the 6 Phillips head screws then reinstall the rear and side grips.

Programming Conversion

When making a mode conversion, the programming must also be changed and 

when changing throttle elevator positions the transmitter must be recalibrated in 

the systems setting screen. 

To Access the System Settings Function

Press and hold the roller while turning on the transmitter. When System Setup 

appears on the screen, release the roller. The DX8 is now in System Setup Mode.

Highlight System Settings then press the roller to access the System Settings 

function. The System Settings screen will appear.

To Select a Mode

In the Systems Settings screen rotate the roller to highlight Mode then press the 

roller to select the Mode function. 

Rotate the roller to select the desired mode then press the roller to accept the 

mode. 

EN
SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL 41

When changing modes that swap throttle and elevator positions it’s necessary 

to recalibrate the sticks. When the mode change is programmed, the calibration 

screen will automatically appear the next time the transmitter is turned on and the 

following screen appears.

To calibrate, move the sticks throughout their range then back to center including 

the throttle. Once all sticks have been centered, press SAVE to complete 

calibration.

Adjustable Stick Tension

The DX8 offers adjustable tension on the throttle, aileron, elevator and rudder 

sticks. Rubber plugs are installed in the back of the case allowing easy access to 

the stick tension screws without having to remove the back case.

To adjust stick tension: 

Step 1. Remove the two rubber plugs and pull back the grips as shown to 

access the throttle, aileron, elevator and rudder tension screws.

Step 2. Using a Phillips screwdriver, adjust the stick tension screw for the 

desired control. Clockwise to tighten and counterclockwise to loosen. 

Step 3. When satisfied with the stick tension, reinstall the grips and rubber plugs. 

Adjustable Stick Length

The DX8 allows you to adjust the control stick’s length. Use the included 2mm 

Allen wrench to loosen the setscrew by turning it counterclockwise. Then, turn 

the stick clockwise to shorten or counterclockwise to lengthen. After adjusting the 

control stick length tighten the 2mm setscrew. 

Advanced Range Testing

For sophisticated aircraft that contain significant amounts of conductive/reflective 

materials (e.g., turbine-powered jets, some types of scale aircraft, aircraft with 

carbon fuselages, etc.), the following advanced range check is recommended. This 

Advanced Range Check allows you to evaluate the RF performance of each

individual internal and remote receiver and optimize the locations of these receivers.

Advanced Range Testing Using a Flight Log or Telemetry Module

1. Plug a flight log or the telemetry module (optional) into the data port in 

the receiver and turn on the system (transmitter and receiver). If using the 

Telemetry module, make sure it’s bound to the receiver.

2. Advance the Flight Log until F- frame losses are displayed, by pressing the 

button on the flight log. Or advance the screen on the DX8 to show the flight 

log telemetry. 

3. Have a helper hold your aircraft while he/she observes the Flight Log data.

4. Standing 30 paces away from the model, face the model with the transmitter 

in your normal flying Position. Place the transmitter in the range test screen 

and push and hold the trainer button on top of the transmitter. This causes 

reduced power output from the transmitter.

5. Have your helper position the model in various orientations (nose up, 

nose down, nose toward the transmitter, nose away from the transmitter, 

etc.) while watching the Flight Log, or the on screen telemetry noting any 

correlation between the aircraft’s orientation and Frame Losses. Do this for 

1 minute. The timer on the DX8 can be used here. For giant-scale aircraft, 

tip the airplane up on its nose and rotate it 360 degrees for one minute, then 

record the data. Next, place the airplane on its wheels and do a second test, 

rotating the aircraft in all directions for one minute.

6. After one minute, release the trainer switch. A successful range check will 

have recorded zero frame losses. Scroll the Flight Log through the Antenna 

fades to evaluate the performance of each receiver. Antenna fades should 

be relatively uniform. If a specific antenna is experiencing a high degree of 

fades, then that antenna should be moved to a different location.

7. A successful Advanced test will yield the following:

H- 0 holds

F- 0 frame losses

A, B, R, L- Antenna fades will typically be less than 100. It’s important to 

compare the relative antenna fades. If a particular receiver has significantly 

higher antenna fades (2 to 3X), then the test should be redone. If the same 

results occur, move the offending receiver to a different location.

Aileron

Elevator

Mode 2

Rudder

Throttle

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42 SPEKTRUM DX8 • RADIO INSTRUCTION MANUAL

Using A Flight Log—Optional

The Flight Log (optional) is compatible with the AR8000 receiver. The Flight 

Log displays overall RF link performance as well as the individual internal and 

external receiver link data. It also displays receiver voltage.

Using the Flight Log

After a flight and before turning off the receiver or transmitter, plug the Flight Log 

into the Data port on the AR8000 receiver. The screen will automatically display 

voltage i.e. 6v2= 6.2 volts. Note: When the voltage reaches 4.8 volts or less, the 

screen will flash indicating low voltage.

Press the button to display the following information:

A - Antenna fades on internal antenna A

B - Antenna fades on internal antenna B (not used on the AR8000)

L - Antenna fades on the left external antenna

R - Antenna fades on the right external antenna (not used on the AR8000)

F - Frame loss

H - Holds

Antenna fades—represents the loss of a bit of information on that specific 

antenna. It’s normal to have as many as 50 to 100 antenna fades during a flight. 

If any single antenna experiences over 500 fades in a single flight, the antenna 

should be repositioned in the aircraft to optimize the RF link.

Frame loss—represents simultaneous antenna fades on all attached receivers. 

If the RF link is performing optimally, frame losses per flight should be less than 20.

A Hold- occurs when 45 continuous frame losses occur. This takes about one 

second. If a hold occurs during a flight, it’s important to re-evaluate the system, 

moving the antennas to different locations and/or checking to be sure the 

transmitter and receivers are all working correctly.

Note: Use a servo extension to allow the Flight Log to be plugged in without 

having to remove the aircraft’s hatch or canopy. On some models, the Flight 

Log can be plugged in, attached and left on the model using double-sided 

tape. It is common with helicopters to mount the Flight Log to the side frame.

EN