Horizon Hobby XF421EX User Manual

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5-CHANNEL COMPUTER RADIO

Page 2

Page 3

XF421EX MANUAL • Table of Contents

I. INTRODUCTION

1. Using This Manual 4

2. Features 4

2.1 Transmitter Features 4

2.2 Receiver Features 4

2.3 Servo Features 5

2.4 Servo Layout 5

3. Specifications 6

3.1 System Specifications 6

3.2 Transmitter Specifications 6

3.3 Servo Specifications 6

3.4 Receiver Specifications 7

3.5 Charger Specifications 7

3.6 Airborne Battery Pack 7

4. Battery Charging 8

4.1 Transmitter/Receiver 8

4.2 Charger 8

5. Trainer System 9

II. XF421EX MANUAL

1. Transmitter Controls 10

1.1 Control Identification and Location 10

1.2

Receiver Channel Assignment/ Transmitter Throttle ALT

1.3 Transmitter Rear 11

1.4 Control Stick Length Adjustment 11

1.5 Direct Servo Control (DSC) 12

1.6 Neck Strap Attachment 12

2. Connections 13

2.1 Installation Requirements 13

2.2 Connections 13

3. Key Input and Display 14

4. Battery Alarm and Display 14

5. Input Mode and Functions 15

5.1 Normal Display 15

5.2 Mode Types 15

5.3 System Mode 16

5.4 Function Mode 16

6. Functions (System Mode) 17

6.1 Data Reset 17

6.2 Model Selection 18

6.3 Wing Type Selection 19

6.4 Model Name Entry 21

7. Functions (Function Mode) 22

7.1 Servo Reversing 22

7.2 Sub-Trim 23

7.3 Travel Adjustment 24

8. Data Sheet 25

III.IMPORTANT INFORMATION

1. General Notes 26

2. Daily Flight Checks 26

3. Warranty Coverage 27

4. Repair Service Instructions 27

5. Frequency Chart 28

T ABLE OF CONTENTS

We strongly encourage all prospective and current R/C aircraft pilots to join the Academy of Model Aeronautics. The AMA is a non-profit organization that provides services to model aircraft pilots. As an AMA member you will receive a monthly magazine entitled Model Aviation, as well as a liability insurance plan to cover against possible accident or injury. All AMA charter aircraft clubs require

individuals to hold a current AMA membership prior to operation of their models. For further information you can contact the AMA at:

Academy of Model Aeronautics 5151 East Memorial Drive Muncie, IN 47302 (317) 287-1256

Thank you for purchasing the JR XF421EX 5-Channel Radio System. This unit has been designed to provide the modeler with a high quality, user friendly radio system that can be depended upon for years to come.

It’s important that you carefully read this manual before attempting to operate your system. Please pay particular attention to Page 9, Introduction 4.2 Charging Your XF421EX Radio System.

AMA INFORMA TION

INTRODUCTION TO THE XF421EX RADIO SYSTEM

Page 4

XF421EX MANUAL • INTRODUCTION 1: Using This Manual / INTRODUCTION 2: Features

The XF421EX is a full feature introductory computer radio that can be used for airplanes. A blank data sheet is included at the end of this manual. Once you have input all the necessary data into your transmitter for a particular model, we

strongly recommend that you write that information down on a copy of the data sheet provided. This is to insure that, in the rare case of a memory failure, you will not lose your data.

INTRODUCTION 1:Using This Manual

USING THIS MANUAL

•

Easy-to-read LCD screen

•

2 model memory

•

Trainer system compatible with most other JR radios

•

2 conveniently mounted programming switches

•

Computer designed ergonomically styled case

•

Adjustable stick length

•

Throttle trim only affects idle position

•

Two speed scrolling—Press and hold the appropriate button to scroll quickly or press and release to scroll in steps

•

Flaperons mixing

•

Delta wing mixing

•

V-tail mixing

R600 Receiver

•

The R600’s extremely compact size allows it to fit easily in limited spaces.

•

An independent laboratory ranked the R600 receiver with JR’s patented ABC&W circuitry as one of the best receivers ever tested in terms of 3IM, 2IM, adjacent channel rejection, signal-tonoise ratio, and on-channel capture point.

•

A special “unwanted interference limiter” ignores signals outside of the R600’s band width when the receiver is on and the transmitter is off. The

limiter also prevents servos from random glitching when other transmitters are operating in close proximity.

•

The electrical circuitry in the R600 is state-of-theart surface mount technology (SMT). These SMT components draw less current, thus increasing flying time. Flush mounting of these components also reduces the risk of vibration wear and damage.

•

The R600 is compatible with all JR FMtransmitting radios.

TRANSMITTER FEA TURES

2.1

RECEIVER FEA TURES

2.2

INTRODUCTION 2:Features

Page 5

XF421EX MANUAL • INTRODUCTION 2: Features

INTRODUCTION 2:Features continued

517 Servo

•

A .03ms deadband amplifier insures accurate neutral centering.

•

Low current drain.

•

Ball bearing supported ouput shaft

•

An indirect drive feedback potentiometer gives additional protection from vibration.

SERVO FEA TURES2.3

SERVO LAYOUT

2.4

Servo Mounting Flange

Rubber Grommets

Servo Case

Servo Lead w/Connector

Servo Output Shaft

Servo Mounting Flange

Servo Arm/Horn

Servo Arm Retaining Screw

Servo Eyelet

Top View

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XF421EX MANUAL • INTRODUCTION 3: Specifications

INTRODUCTION 3:Specifications

SYSTEM SPECIFICA TIONS

TRANSMITTER SPECIFICA TIONS

3.1

3.2

SYSTEM NAME XF421EX TRANSMITTER BODY XF421EX RECEIVER R600 CHARGER NEC-221 AIRBORNE BATTERY 4N-600 SERVOS NES-517BBX4 ACCESSORIES Mini Switch

12" Aileron Extension Servo Accessories Instruction Manual

TYPE AIRPLANE

MODEL NUMBER XF421EX ENCODER 5 Channel Computer System RF 50/53/72 MHz MODULATION PPM (FM) OUTPUT POWER Approximately 1 Watt CURRENT DRAIN 200mA POWER SOURCE 1.2Vx8 Nicad (9.6V) 600mah OUTPUT PULSE 1000-2000 (1500 Neutral)

TYPE AIRPLANE

SERVO SPECIFICA TIONS3.3

TORQUE (oz./in.) 40.3 SPEED (sec.) .25 WEIGHT (oz.) 1.47 SIZE (in.) (W x L x H) 0.73 x 1.52 x 1.32 BB YES MOTOR 3-Pole Ferite

TYPE 517BB

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XF421EX MANUAL • INTRODUCTION 3: Specifications

RECEIVER SPECIFICA TIONS

3.4

CHARGER SPECIFICA TIONS

AIRBORNE BA TTERY P ACK

3.5

3.6

MODEL NUMBER NER-600 TYPE 6-Channel/FM-ABC & W/Circuitry FREQUENCY 50/53/72MHz SENSITIVITY (Microseconds) 5µs Minimum SELECTIVITY 8KHz/50dB WEIGHT (oz.) 1 oz. SIZE (in.) (W x L x H) 1.43 x 2.06 x .55 RECEIVER ANTENNA 39" For All Aircraft Frequencies

TYPE R600 FM

MODEL NUMBER NEC-211 INPUT VOLTAGE AC 100-120V OUTPUT CURRENT 50mAh Tx/50mAh Rx CHARGING TIME 15 Hours

TYPE AIRPLANE

MODEL NUMBER 4N-600 VOLTAGE 4.8V SIZE (in.) (W x L x H) 2.24 x 0.59 x 2.05 WEIGHT (oz.) 3.3

TYPE AIRPLANE

INTRODUCTION 3:Specifications continued

Page 8

XF421EX MANUAL • INTRODUCTION 4: Battery Charging

INTRODUCTION 4:Battery Charging

The pilot lamps should always be on during the charging operation. If they are not, check to make sure you have turned off both the transmitter and receiver.

Do not use the charger for equipment other than JR. The charging plug polarity may not be the same and equipment damage may result.

Do not use other manufacturers’ after-market accessories that plug into the transmitter’s charging jack. If you do, any damage that results will not be covered by warranty. If you are unsure of compatibilities with your radio, seek expert advice before doing anything to avoid possible damage. During the charging operation, the charger’s temperature is slightly elevated. This is normal.

CHARGER4.2

It is imperative that you fully charge both the transmitter and the receiver battery packs prior to each day of flying. For the initial charge, leave the charger and batteries hooked up for 20-24 hours in order to fully charge both battery packs to peak capacity. For subsequent charges, leave the charger and batteries hooked up overnight (approximately 16 hours).

The charger supplied with this system is designed to recharge your transmitter battery at a rate of 50mA. The receiver battery pack will charge at 50mA for the 600mAh battery pack.

Transmitter Only

The center pin on all JR remote control systems is negative. Therefore, the center pin on all JR chargers is negative, not positive. This is different from any other manufacturers’ chargers and radio systems. Beware of improper connections based on “color code” wire leads as they do not apply in this instance. You must make certain that the center pin of your JR transmitter is always connected to the negative voltage for correct polarity hookup.

TRANSMITTER / RECEIVER4.1

RIGHT SIDE OF TRANSMITTER

CENTER

PIN IS

NEGATIVE

OUTSIDE IS POSITIVE

CHARGER PIGTAIL FOR TRANSMITTER

BLACK TO POSITIVE

RED TO NEGATIVE

CHARGER PIGTAIL FOR RECEIVER

RED–POSITIVE / BROWN–NEGATIVE / ORANGE–SIGNAL

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XF421EX MANUAL • INTRODUCTION 5: Trainer System

The XF421EX features a built-in trainer system. The transmitter can be used as either a master (trainer) or as a slave (trainee). The XF421EX is compatible with

all other current JR radios that have built-in trainer systems. An optional trainer cord is needed (JRPA130).

1. Match the servo reversing, sub-trims, travel adjust and trims of both radios.

2. Plug the optional trainer cord into both transmitters.

3. Turn on the master transmitter. (Note: The slave radio must be left off.)

4. Test all the control functions on your aircraft with the master radio.

5. Push the trainer button on the master transmitter and check all the control functions with the slave radio.

INTRODUCTION 5:TrainerSystem

TRAINER SYSTEM5

D.S.C.

TRAINER

CORD INPUT

Operating the T rainer System

TRAINER BUTTON

MULTI

TRAINER

DATA

ENTER

SCROLL

CHANNEL

FUNCTION 3-4 1-4 FUNCTION 1-2 2-3

DISPLAY

5 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM

VOLTAGE INDICATOR

AUX.CH.

ENTER

+ INCR

- DECR

OPTIONAL

TRAINER CORD

(JRPA130)

MULTI

TRAINER

DATA

ENTER

SCROLL

CHANNEL

FUNCTION 3-4 1-4 FUNCTION 1-2 2-3

DISPLAY

5 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM

VOLTAGE INDICATOR

AUX.CH.

ENTER

+ INCR

- DECR

MASTER TX

POWER SWITCH ON

SLAVE TX

POWER SWITCH OFF

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XF421EX MANUAL • CHAPTER 1: Transmitter Controls

1. THRO Throttle Channel

2. AILE Aileron Channel

3. ELEV Elevator Channel

4. RUDDRudder Channel

5. GEAR Gear Channel

Transmitter Throttle ALT

The throttle ALT function makes the throttle stick trim active only when the throttle stick is less than half throttle. This gives easy, accurate idle adjustments without affecting the high throttle position.

RECEIVER CHANNEL ASSIGNMENT/TRANSMITTER THROTTLE AL T1.2

GEAR SWITCH

INPUT KEY

ANTENNA

LCD SCREEN

TRAINER SWITCH

INPUT KEY

AILERON/ELEVATOR STICK

THROTTLE/RUDDER STICK

POWER SWITCH

AILERON TRIM

ELEVATOR TRIM

THROTTLE TRIM

RUDDER TRIM

NECK STRAP EYELET

CARRYING HANDLE

CONTROL IDENTIFICA TION AND LOCA TION• Mode II

CHAPTER 1:Transmitter Controls

1.1

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XF421EX MANUAL • CHAPTER 1: Transmitter Controls

To adjust the control stick length, use a 2mm Allen wrench to unlock the set screw located inside the end of the control stick. Turn the set screw counterclockwise to loosen it, then turn the knurled portion of the stick to adjust the length. Counterclockwise will lengthen the stick and clockwise will shorten it. After the control stick(s) has been adjusted to suit your flying style, tighten the set screw.

CONTROL STICK LENGTH ADJUSTMENT1.4

CHAPTER 1:Transmitter Controls continued

TRANSMITTER REAR1.3

Note: Your transmitter has a 5-year lithium battery to protect your pre-programmed data against main transmitter battery failure. If your system reads 0.0 volts, or has an unfamiliar display (service mode) or

your data resets to the factory defaults, return your transmitter to Horizon Service Center (see page 28) for lithium battery replacement.

BATTERYCONNECTOR Use caution when disconnecting/removing the transmitter battery pack as if the connector is not properly disconnected, damage to the connector and/or the radio system can result.

SET SCREW

LOOSEN

TIGHTEN

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XF421EX MANUAL • CHAPTER 1: Transmitter Controls

CHAPTER 1:Transmitter Controls continued

For proper DSC hook-up and operation:

1. Leave the transmitter power switch off. The transmitter will not transmit any radio frequency (RF) in this position.

2. Plug the optional DSC cord (JRPA132) into the DSC port in the rear of the transmitter.

3. The encoder section of the transmitter will now be operational and the LCD display will be lit.

4. Plug the other end of the DSC cord into the receiver charge receptacle. Turn on the switch harness.

Note: When installing the optional charging jack (JRPA024) be sure to hook the charging jack receptacle securely into the switch harness charge cord.

Why you should use the DSC function:

1. The DSC enables you to check the control surfaces of your airplane without drawing the fully operational 200mAh from your transmitter battery pack. Instead, you will only draw 70mAh when using the DSC function.

Note: You will need to purchase (separately) both the DSC cord (JRPA132) and the JR Deluxe Switch Harness (JRPA001) to make use of the XP652 DSC function.

2. The DSC function allows you to make final adjustments to your airplane or helicopter without transmitting any radio signals. Therefore, if another pilot is flying on your frequency, you can still adjust your aircraft and not interfere with the other aircraft.

Note: Under no circumstances should you attempt to fly your aircraft with the DSC cord plugged in! This feature is for bench checking your aircraft only.

There is an eye hook on the front of the transmitter for attaching an optional neck strap (JRPA023). The eye hook is precisely positioned (see Section 1.1)

so that the transmitter will be perfectly balanced when a neck strap is used.

DIRECT SERVO CONTROL (DSC)1.5

A - Charge Cord/DSC Receptacle B - Switch Harness Lead C - Charger/DCS Cord

NECK STRAP A TT ACHMENT1.6

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XF421EX MANUAL • CHAPTER 2: Connections

It is important to correctly install the radio system in your model. Please read and carefully follow the suggestions listed below.

1. For added protection, wrap the Rx and the Rx Nicad in foam rubber that is at least 1/4” thick.

2. Run the Rx antenna through the fuselage and make sure it is fully extended. Never cut or bundle your Rx antenna — this will decrease range and performance.

3. Rubber servo grommets are included with your radio system and should be installed in the servo flanges. The servos should then be mounted on either hardwood rails or a plywood tray with the mounting screws provided. Do not overtighten the mounting screws. The flange of the brass eyelets should face down (toward the wood).

4. All servos must be able to move freely over the full range of their travel. Make sure the linkages

do not impede servo travel. A stalled servo will drain the battery pack within a few minutes.

5. Before installing servo output arms, make sure the servo is in its neutral position.

6. In the case of gas-powered model aircraft, mount the receiver power switch on the side of the fuselage opposite the muffler to protect the switch from exhaust residue. With other types of models, mount the switch in the most convenient place. Make sure that the switch operates freely and is capable of traveling its full distance.

7. With your model sitting on the ground and the

transmitter antenna collapsed, check that your system works at a distance of 75 to 100 feet.

If your system stops functioning at a distance that is shorter than listed above, please contact the Horizon Service Center for further information prior to flying your model.

INST ALLA TION REQUIREMENTS

CHAPTER 2:Connections

CONNECTIONS2.2

2.1

BATT AUX 1 GEAR RUDD ELEV AILE THRO

6 CH 72MHz FM RECEIVER

ABC&W INTERFERENCE

PROTECTION SYSTEM

R600 RECEIVER

ON/OFF SWITCH HARNESS

NEW ABC & W SYSTEM

6 CHANNEL RECEIVER

NER-226X

JAPAN REMOTE CONTROL CO., LTD

MADE IN JAPAN

226X RECEIVER

ANTENNA

RECEIVER BATTERY

OFF

(JRPA003)

BATT AUX 1 GEAR RUDD ELEV

AILE THRO

4N-600

GEAR

2MHz

RUDDER

ELEVATOR

AILERON

THROTTLE

Page 14

XF421EX MANUAL • CHAPTER 3: Key Input and Display / CHAPTER 4: Battery Alarm and Display

Two input keys are located at the upper right and left face of the XF421EX transmitter. The keys are used to access and program the transmitter. Each key can be moved up or down using your thumbs.

CHAPTER 4:Battery Alarm and Display

CHAPTER 3:Key Input and Display

KEY INPUT AND DISPLA Y3

When the transmitter battery drops below 9.0 volts, the display will start to flash BAT and an audible alarm will sound for 8 beeps. These warnings mean you should land your aircraft immediately.

Note: During the period that the battery alarm

is flashing, the input buttons will not function. If you are currently in the function mode, the transmitter will exit automatically and return to the normal display (see Section 5.1).

BA TTERY ALARM AND DISPLAY4

BAT

8.9V

FLASHING

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

Left button up........SCROLL — Used to advance

through the menus.

Left button down...CHANNEL — Used to advance

through the channels or features in a given function.

Right button up........+INCR — Increses value or

changes setting (e.g., Reverse Normal).

Left button down......-DECR — Decreses value or

changes setting. (e.g., Reverse Normal).

Page 15

XF421EX MANUAL • CHAPTER 5: Input Mode and Functions

When the power switch is turned on the screen will read as shown here in the diagram. This screen is referred to as the normal display.

CHAPTER 5:Input Mode and Functions

I0.4V

MDI

MODEL NAME

BA TTER Y VOLTA GE

NORMAL DISPLA Y5.1

The XF421EX features two type of programming paths. System Setup Mode includes programming functions that are initially adjusted when the model is first set up, like selecting wing type or the model, and is seldom accessed after the initial set up. System Modes include:

MODEL RESET MODEL SELECT WING TYPE MIXING V-TAIL MIXING MODEL NAME

Function Mode includes programming that is more frequently changed, sometimes at the flying field. Function Modes include:

SERVO REVERSING SUB-TRIM TRAVELADJUST

MODE TYPES5.2

Page 16

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

To enter Systen Setup Mode press both programming buttons up and turn on the Power Switch

Power Switch

RST

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

To enter Function Mode turn on the Power Switch and then press both programming buttons up

Power Switch

THR

REV•NORM

XF421EX MANUAL • CHAPTER 5: Input Mode and Functions

To enter the Function Mode, turn on the transmitter. Press the SCROLL and +INCR buttons up simultaneously until a beep is heard. The display will change accordingly and show the last active function. Press the SCROLL button up to scroll down through the functions one by one as shown in the flowchart at left. Once the appropriate function is selected, use the CHANNEL button to select the appropriate channel. Use the INCREASE and DECREASE buttons to adjust the values displayed on the screen.

CHAPTER 5:Input Mode and Functions continued

FUNCTION MODE5.3

THR

REV•NORM

SERVO REVERSING Page 23

SUB-TRIM Page 24

TRAVELADJUSTMENT Page 25

THR

SB-TRIM

+I00

THR

TRV ADJ

To enter the System Mode, press the SCROLL and +INCR buttons up simultaneously while you turn on the transmitter. You can now select any of four system mode functions shown here in the flow chart. To exit the System Mode, press the SCROLL and +INCR buttons simultaneously or turn off the transmitter. Press up the SCROLL button to move through the System Mode functions. Information for each function is located on the page number listed next to the function name.

SYSTEM MODE5.3

MODEL NAME ENTRY Page 22

WING TYPE SELECTION FPR FLAPERON DELTA V-TAIL Page 20–21

RST

DATA RESET Page 18

MODEL SELECTION Page 19

MDL

WNG

MIX

MDI

MIX

Programming Button

Page 17

XF421EX MANUAL • CHAPTER 6: Functions (System Mode)

Press the CHANNEL button down and

+INCR button up simultaneously

to reset the data (a beep will sound)

In System Setup Mode

press the SCROLL button up

until RST appears on

the screen

RST

INDICATES DATA RESET FUNCTION

MODEL NUMBER TO RESET

Accessing the Data Reset Function

CHAPTER 6:Functions (System Mode)

The data reset function allows you to reset all the programming in the selected model (1 or 2) to the factory settings. Before using the data reset function it’s important to enter the model selection function

and select the desired model number (1 or 2) for which you want to reprogram to the factory settings. The model selection function is described in Section 6.2.

1. Press the SCROLL and +INCR buttons up simultaneously and hold.

2. Turn on the transmitter to enter the System Mode.

3. Press the SCROLL button up until RST appears on the screen.

4. Press the CHANNEL and INCREASE buttons simultaneously to reset the data. (To confirm that

the selected model's programming has been reset, a beep will sound and model number momentarily disappear from the screen.)

5. Press the SCROLL button to access the model select function.

6. To exit, press the SCROLL and +INCR buttons up simultaneously.

DA T A RESET• System Mode

6.1

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

RST

Page 18

XF421EX MANUAL • CHAPTER 6: Functions (System Mode)

The XF421EX has memory for two models.

1. Press the SCROLL and +INCR buttons up simultaneously and hold.

2. Turn on the transmitter to enter the System Mode.

3. Press the SCROLL button until MDL appears on the screen.

4. Press the INCREASE or DECREASE button to select model number 1 OR 2.

5. Press the SCROLL button to access the wing type entry function.

6. To exit, press the SCROLL and +INCR buttons up simultaneously.

Accessing the Model Selection Function

MODEL SELECTION• System Mode

6.2

CHAPTER 6:Functions (System Mode) continued

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

MDL

In System Setup Mode

press the SCROLL button

until MDL appears on

the screen

INDICATES MODEL SELECTION FUNCTION

MODEL NUMBER 1 OR 2

Press the +INCR or -DECR

button to select model number 1 or 2

Page 19

XF421EX MANUAL • CHAPTER 6: Functions (System Mode)

Accessing the Wing T ype Selection Function

Flaperon, V-tail and Delta mixing are available for specialty aircraft that require those functions. The flaperon feature mixes flaps with ailerons so the ailerons can be drooped for takeoffs and landings while still functioning fully as ailerons. V-tail mixing combines rudder and elevator for V-tail operations. The Delta wing function allows the aileron to also act as the elevator, while retaining independent use of both functions. The Delta wing function allows the ailerons to also act as the elevator, while retaining independent use of both functions.

Flaperon Setup

When using flaperon mixing, two servos (one for each aileron) must be used. Connect the left aileron servo to channel #5 (Gear) and the right aileron servo to channel #2 (Aile) in the receiver. Individual functions (e.g., servo reversing, sub-trims, etc.) are still available for each of the channels. Use sub-trims for individual neutral adjustment.

V-Tail

V-Tail mixing requires two servos. Connect the left tail servo to channel #3 (Elev) and the right tail servo to channel #4 (Rudd) in the receiver. Individual functions (e.g., servo reversing, sub-trims, etc.) are available for each servo. Use sub-trims for individual neutral adjustments described in Section 7.2. V-Tail elevator travel is adjusted by elevator and rudder travel adjust.

Delta Wing Mixing

Delta, or elevon mixing as it is commonly known, is the final wing mixing selection in your XF421EX. This style of aircraft also employs two wing servos. However, in essence, there is not an elevator present. Instead, at an elevator stick input, the two wing servos function in conjunction with one another in the same direction to create an up/down movement of the aircraft. Also, when an aileron control is given, the two wing servos move in opposite directions to function as ailerons as well.

1. Press the SCROLL and +INCR buttons up simultaneously and hold.

2. Turn on the transmitter to enter the System Mode.

3. Press the SCROLL button until the MIX WNG appears on the screen.

4. Press the channel button to select either the wing type (WNG) or V-tail (VTL) mode.

5. Press the SCROLL button to access the model name function.

6. To exit, press the SCROLL and +INCR buttons up simultaneously.

WING TYPE SELECTION• System Mode

6.3

CHAPTER 6:Functions (System Mode) continued

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

MIX

INDICA TES WING TYPE FUNCTION FPR = FLAPERON

VTL = V-TAIL DLT = DELTA WNG = WING TYPE SELECTION OF = OFF ON = ON

Press the SCROLL

button until MIX

WNG appears on

the screen

Press the CHANNEL

button to select

Wing Type (WNG) or

V-tail (VTL) mixing

Press the +INCR or -DECR

button to turn the flaperon (FPR), Delta (DLT)

or V-tail (VTL) mixing on or off

Page 20

XF421EX MANUAL • CHAPTER 6: Functions (System Mode)

CHAPTER 6:Functions (System Mode) continued

T o Activate Flaperon (FPR) Mixing (Wing Type Mode)

T o Activate Delta Wing (DLT) Mixing (Wing T ype Mode)

1. In System Setup Mode press the SCROLL button until MIX WNG appears on the screen

2. Press the +INCR button to activate Flaperon mixing

FPR

MIX

OF = MIX OF ON = MIX ON

DLT

MIX

2. Press the CHANNEL button once to access the V-tail mixing screen

DELTA WING MIX ON

VTL

MIX

T o Activate V -Tail (VTL) Mixing

Note: It is also possible to activate both the flaperon (FPR) and V-tail functions (VTL) to work simultaneously.

WING TYPE SELECTION• System Mode (continued)

6.3

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

1. In System Setup Mode press the SCROLL button until MIX WNG appears on the screen

2. Press the -DECR button to activate Delta wing mixing

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

1. In System Setup Mode press the SCROLL button until MIX WNG appears on the screen

3. Next press either the +INCR or

-DECR buttons once to activate V-tail mixing

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

WNG

MIX

WNG

MIX

WNG

MIX

Page 21

XF421EX MANUAL • CHAPTER 6: Functions (System Mode)

CHAPTER 6:Functions (System Mode) continued

1. Press the SCROLL and +INCR buttons up simultaneously and hold.

2. Turn on the transmitter to enter the System Mode.

3. Press the SCROLL button until MD1 appears on the screen.

4. Press the INCREASE or DECREASE buttons to select the correct letter/number for the first character (flashing).

5. To adjust the remaining 2 characters, press the CHANNEL button until the desired character to be adjusted is flashing.

6. Press the SCROLL button to access the modulation select function.

7. To exit, press the SCROLLand +INCR buttons up simultaneously.

Accessing the Model Name Entry Function

Press the CHANNEL button to select the character to be changed (flashing)

Press the +INCR or -DECR buttons to select the desired character (A-Z, 1-9, etc.)

Flashing Character includes

character to be adjusted

CURRENT MODEL

NUMBER

ACI

In System Setup Mode press the SCROLL button until MD1 appears on the screen

The XF421EX allows a 3 digit name to be input for each of the 2 models available. The current model will be displayed in the normal display. This feature

is useful to help identify different aircraft types or model setups.

MODEL NAME ENTRY• System Mode

6.4

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

MDI

Page 22

XF421EX MANUAL • CHAPTER 7: Functions (Function Mode)

CHAPTER 7:Functions(Function Mode)

Servo reversing is a very convenient function used in the setup of a new aircraft. It is used to change the direction of servo rotation in relation to the

corresponding stick movement. Servo reversing is available for all channels.

1. Turn on the transmitter.

2. Press the SCROLL and +INCR buttons up simultaneously to enter the Function Mode.

3. Press the SCROLL button until REV NORM appears on the screen.

4. Press the CHANNEL button until the desired channel appears on the screen.

5. Press the INCREASE or DECREASE button to change the servo direction.

6. Press the SCROLL button to access the sub-trim function.

7. To exit, press the SCROLL and +INCR buttons up simultaneously.

Accessing the Servo Reversing Function

SERVO REVERSING• Function Mode

7.1

THR : THROTTLE AIL : AILERON ELE : ELEVATOR RUD: RUDDER GER: LANDING GEAR

CHANNEL

1 2 3 4 5

REV◆NORM

THR

Press the +INCR or -DECR

button to change the servo direction

Press the SCROLL

button until

REV

◆

NORM

appears on the

screen

Press the

CHANNEL button

until the desired

channel appears

on the screen

TRAINER

SCROLL

CHANNEL

ENTER

AUX.CH.

ENTER

+ INCR

- DECR

Page 23

XF421EX MANUAL • CHAPTER 7: Functions (Function Mode)

Accessing the Sub-T rim Function

Sub-trim is an electronic trim that is available for each of the 5 channels. Sub-trim is particularly useful as it allows the mechanical trim levers to be returned to their neutral positions by adjusting /changing the servo’s neutral position electronically, without the need to mechanically adjust the specific control linkage. This allows the same mechanical trim lever settings between the two models you can control

with this radio system. Sub-trim can also allow additional trim travel when mechanical trims do not provide enough movement.

Note: It is recommended to use as little sub-trim as possible for adjustment. If more that 20–30 points are required, is it suggested that a mechanical linkage adjustment be performed.

1. Turn on the transmitter.

2. Press the SCROLL and +INCR buttons up simultaneously to enter the Function Mode.

3. Press the SCROLL button until SB-Trim appears on the screen.

4. Press the CHANNEL button until the desired channel appears on the screen.

5. Press the +INCR or -DECR button to establish the desired amount of sub-trim.

6. Press the SCROLL button to access the travel adjustment function.

7. To exit, press the SCROLL and +INCR buttons up simultaneously.

SUB-TRIM• Function Mode

7.2

CHAPTER 7:Functions(Function Mode) continued

TRAINER

SCROLL

CHANNEL

- DECR

ENTER

AUX.CH.

+ INCR

ENTER

INDICA TES THE SUB-TRIM FUNCTION

SB-TRIM

THR

CHANNEL

1 2 3 4 5

SUB-TRIM VALUE ( ±125)

THR : THROTTLE AIL : AILERON ELE : ELEVATOR RUD: RUDDER GER: LANDING GEAR

Press the SCROLL

button until

SB-TRIM

appears on the

screen

Press the

CHANNEL button

until the desired

channel appears

on the screen

Press the +INCR or -DECR

button to adjust the sub-trim value

Page 24

XF421EX MANUAL • CHAPTER 7: Functions (Function Mode)

CHAPTER 7:Functions(Function Mode) continued

The amount of servo travel is adjustable for each direction for each of the 5 channels individually. The adjustment range is from 0% to 150%. Travel adjustment is factory set at 100% for all channels. The travel adjustment value displayed on the screen

depends on the position of the stick or switch (e.g., flap switch, gear switch). This function is useful either to maximize control surface travel, or to reduce travel to eliminate servo binding without the need for mechanical adjustment.

1. Turn on the transmitter.

2. Press the SCROLL and +INCR buttons up simultaneously to enter the Function Mode.

3. Press the SCROLL button until TRV ADJ. appears on the screen.

4. Press the CHANNEL button until the desired channel appears on the screen.

5. Move the selected channel stick or switch in the direction that you want to adjust the travel. Press

the +INCR or -DECR button to achieve the desired travel. Move the stick in the opposite direction to adjust the travel in the opposite direction.

6. The same may be done for all channels.

7. Press the SCROLL button to access the Servo Reverse function.

8. To exit, press the SCROLL and +INCR buttons up simultaneously.

Press the +INCR or -DECR

button to adjust the travel adjustment value

Press the SCROLL

button until

TRV ADJ.

appears on the

screen

Press the

CHANNEL button

until the desired

channel appears

on the screen

TRV ADJ.

THR

+I00

THR : THROTTLE AIL : AILERON ELE : ELEVATOR RUD: RUDDER GER: LANDING GEAR

CHANNEL

1 2 3 4 5

INDICA TES THE TRA VEL ADJUSTMENT FUNCTION

TRAVEL ADJUSTMENT VALUE

SERVO OPERATING DIRECTION

Accessing the T ravel Adjustment Function

TRAVEL ADJUSTMENT• Function Mode

7.3

TRAINER

SCROLL

CHANNEL

ENTER

AUX.CH.

ENTER

+ INCR

- DECR

Page 25

XF421EX MANUAL • CHAPTER 8: Data Sheet

DA T A SHEET

CHAPTER 8:Data Sheet

NORM NORM NORM NORM NORM

•••••

REV REV REV REV REV

SUB TRIM

TRAVEL ADJUST + % + % + % + % + %

(TRV ADJ.) + % + % + % + % + %

REVERSE SW

CHANNELS THRO (1) AIL (2) ELE (3) RUDD (4) GER (5)

WING TYPE

V-TAIL

ON • OFF

NORM

•

FLAPERON

•

DELTA

Model Number _____________________ Model Name ______________________

Page 26

XF421EX MANUAL • IMPORTANT INFORMATION

IMPORT ANT INFORMATION

Radio controlled models are a great source of pleasure. Unfortunately, they can also pose a potential hazard if not maintained and operated properly. It is imperative that you 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 shop.

Listed below are some safety Dos and Don’ts that must be followed by all pilots:

• Ensure that your batteries have been properly charged prior to initial flight.

• Keep track of the time that the system is turned on so that you will have an idea of how long you can safely operate your system.

• Perform a ground range check prior to the initial flight of the day. See the “Daily Flight Checks” Section below for information on how to do so.

• Check all control surfaces prior to each takeoff.

• Use frequency flags.

• Do not fly your model near spectators, parking areas, or at 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 fly unless your frequency is clear. Warning: Only one transmitter at a time can operate on a given frequency. If you turn on your transmitter while someone else is operating a model on your frequency, both pilots will lose control of their models. Only one person can use a given frequency at a time. It does not matter if it is AM, FM or PCM — only one frequency at a time.

• 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.

1. Check the battery voltage on both the transmitter and the receiver battery packs. Do not fly below

9.0 volts on the transmitter or below 4.7 volts on the receiver. To do so can cause a crash of 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, bolts) prior to each day’s flight. Be sure that binding does not occur and that everything is 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. The range check should be as follows:

• Do not extend the transmitter antenna at this time. Turn the transmitter “on.”

• Turn the model “on.”

• Slowly walk away from the model while moving the control surfaces. The aircraft should function properly at a distance of 75–100 feet.

5. Just prior to starting your aircraft, turn “off” your transmitter and 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. Ensure that all trim levers are in the proper location.

7. Check to be sure that all servo pigtails and switch harness plugs are secured in the receiver. Also, make sure that the switch harness moves completely in both directions.

GENERAL NOTES

DAILY FLIGHT CHECKS

Page 27

XF421EX MANUAL • WARRANTY AND SERVICE IMFORMATION

Important Note: Be sure to keep your original dated sales receipt in a safe place as you will be required to provide proof-of-purchase date for the equipment to be serviced under warranty.

WARRANTY AND SERVICE INFORMA TION

WARRANTY COVERAGE

REPAIR SERVICE INSTRUCTIONS

Your new JR Remote Control Radio System is warranted to the original purchaser against manufacturer defects in material and workmanship for one year from the date of purchase. During this period, Horizon Service Center will repair or replace, at our discretion and at no cost to the purchaser, any component that is found to be factory defective. This warranty is limited to the original purchaser of the unit and is not transferable.

This warranty does not apply to any unit which has been improperly installed, mishandled, abused, or

damaged in a crash, or to any unit which has been repaired or altered by any unauthorized agencies. Under no circumstances will the buyer be entitled to consequential or incidental damages. This limited warranty gives you specific legal rights; you also have other rights which may vary from state to state. As with all fine electronic equipment, do not subject your radio system to extreme temperatures, humidity or moisture. Do not leave it in direct sunlight for long periods of time.

In the event that your JR radio needs service, please follow the instructions listed below:

1. Check all on/off switches to be sure they are off. This will speed the repair process of checking battery condition.

2. Return your system components only (transmitter, receiver, servos, etc). Do not return your system installed in a model aircraft.

3. Preferably, use the original carton/packaging (molded foam container), or equivalent, to ship your system. Do not use the system carton itself as a shipping carton. You should package the system carton within a sturdy shipping container using additional packing material to safeguard against damage during transit. Include complete name

and address information inside the carton, as well as clearly writing it on the outer label/return address area.

4. Include detailed information explaining your operation of the system and problem(s) encountered. Provide an itemized list of equipment enclosed and identify any particular area/function which may better assist our technicians in addressing your concerns. Date your correspondence, and be sure your complete name and address appear on this enclosure.

5. Include your name, mailing address, and a phone

number where you can be reached during the business day.

6. Warranty Repairs. To receive warranty service, you must include your original dated sales receipt to verify your proof-of-purchase date. Providing that warranty conditions have been met, your radio will be repaired without charge.

7. Normal Non-Warranty Repairs. Should your repair cost exceed 50% of the retail purchase cost, you will be provided with an estimate advising you of your options.

Within your letter, advise us of the payment method you prefer to use. Horizon Service Center accepts VISA or MasterCard. Include your card number and expiration date. Horizon Service Center also accepts money orders.

Mail your system to:

Horizon Service Center

4105 Fieldstone Road Champaign, IL 61822 Phone: (217) 355-9511 www.horizonhobby.com

Page 28

XF421EX MANUAL • FREQUENCY CHART

72 MHz requires no special license to operate. 50/53 MHz requires the operator to have an FCC

amateur radio license (Ham).

CH.NO. FREQUENCY

15 72.090 16 72.110 17 72.130 18 72.150 19 72.170 20 72.190 21 72.210 22 72.230 23 72.250 24 72.270 25 72.290 26 72.310 27 72.330 28 72.350 29 72.370 30 72.390 31 72.410 32 72.430 33 72.450 34 72.470 35 72.490

CH.NO. FREQUENCY

36 72.510 37 72.530 38 72.550 39 72.570 40 72.590 41 72.610 42 72.630 43 72.650 44 72.670 45 72.690 46 72.710 47 72.730 48 72.750 49 72.770 50 72.790 51 72.810 52 72.830 53 72.850 54 72.870 55 72.890 56 72.910 57 72.930 58 72.950 59 72.970 60 72.990

CH.NO. FREQUENCY

00 50.800 01 50.820 02 50.840 03 50.860 04 50.880 05 50.900 06 50.920 07 50.940 08 50.960 09 50.980

72 MHz 50MHz

CH. NO. FREQUENCY FLAG COLOR

A1 53.100 Black/Brown A2 53.200 Black/Red A3 53.300 Black/Orange A4 53.400 Black/Yellow A5 53.500 Black/Green A6 53.600 Black/Blue A7 53.700 Black/Purple A8 53.800 Black/Gray

53 MHZ

FREQUENCY CHART

72 MHz

FREQUENCY CHART

*Channels 11–14 are not available

Page 29

NOTES

Page 30

NOTES

Page 31

Page 32

DISTRIBUTED EXCLUSIVELY BY HORIZON HOBBY DISTRIBUTORS CHAMPAIGN, IL 61822

www.horizonhobby.com