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XF421EX User Manual

XF421EX Manual

5-CHANNEL COMPUTER RADIO

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

TABLE 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 INFORMATION

INTRODUCTION TO THE XF421EX RADIO SYSTEM

4XF421EX 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-to-

noise 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-the-

art 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 FM-

transmitting radios.

TRANSMITTER FEATURES

2.1

RECEIVER FEATURES

2.2

INTRODUCTION 2:Features

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 FEATURES2.3

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

6XF421EX MANUAL • INTRODUCTION 3: Specifications

INTRODUCTION 3:Specifications

SYSTEM SPECIFICATIONS

TRANSMITTER SPECIFICATIONS

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 SPECIFICATIONS3.3

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

XF421EX MANUAL • INTRODUCTION 3: Specifications

RECEIVER SPECIFICATIONS

3.4

CHARGER SPECIFICATIONS

AIRBORNE BATTERY PACK

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

8XF421EX 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.

CENTER

PIN IS

NEGATIVE

OUTSIDE IS POSITIVE

RIGHT SIDE OF TRANSMITTER

CHARGER PIGTAIL FOR RECEIVER

CHARGER PIGTAIL FOR TRANSMITTER

BLACK TO POSITIVE

RED TO NEGATIVE

RED–POSITIVE / BROWN–NEGATIVE / ORANGE–SIGNAL

TRANSMITTER / RECEIVER4.1

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:Trainer System

TRAINER SYSTEM5

D.S.C. TRAINER

CORD INPUT

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

MULTI

DATA

DISPLAY

VOLTAGE

INDICATOR

TRAINER

SCROLL

CHANNEL - DECR

5 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM

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

MULTI

DATA

DISPLAY

VOLTAGE

INDICATOR

OPTIONAL

TRAINER CORD

(JRPA130)

MASTER TX

POWER SWITCH ON SLAVE TX

POWER SWITCH OFF

ENTER

AUX.CH.

+ INCR

ENTER

5 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM

TRAINER

SCROLL

CHANNEL

ENTER

- DECR

AUX.CH.

+ INCR

ENTER

TRAINER BUTTON

Operating the Trainer System

10 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 ALT1.2

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 IDENTIFICATION AND LOCATION • Mode II

CHAPTER 1:Transmitter Controls

1.1

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

LOOSEN

TIGHTEN

SET SCREW

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.

BATTERY CONNECTOR

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.

12 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 ATTACHMENT1.6

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.

INSTALLATION REQUIREMENTS

CHAPTER 2:Connections

CONNECTIONS2.2

2.1

OFF

GEAR

RUDDER

ELEVATOR

AILERON

THROTTLE

ON/OFF SWITCH HARNESS

(JRPA003)

RECEIVER BATTERY

4N-600

226X RECEIVER

NEW ABC & W SYSTEM

6 CHANNEL RECEIVER

BATT

AUX 1

GEAR

RUDD

ELEV

AILE

THRO

NER-226X

JAPAN REMOTE CONTROL CO., LTD

MADE IN JAPAN

2MHz

ANTENNA

BATT

AUX 1

GEAR

RUDD

ELEV

AILE

THRO

6 CH 72MHz FM RECEIVER

ABC&W INTERFERENCE

PROTECTION SYSTEM

R600 RECEIVER

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 DISPLAY3

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).

BATTERY 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).

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

BATTERY VOLTAGE

NORMAL DISPLAY5.1

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

TRAVEL ADJUST

MODE TYPES5.2

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

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

16 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

TRAVEL ADJUSTMENT

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 Programming Button

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.

DATA RESET • System Mode

6.1

TRAINER

SCROLL

CHANNEL - DECR

ENTER

AUX.CH.

+ INCR

ENTER

RST

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

Press the +INCR or -DECR

button to select model number 1 or 2

In System Setup Mode

press the SCROLL button

until MDL appears on

the screen

MDL INDICATES MODEL SELECTION FUNCTION

MODEL NUMBER 1 OR 2

CHAPTER 6:Functions (System Mode) continued

TRAINER

SCROLL

CHANNEL - DECR

ENTER

AUX.CH.

+ INCR

ENTER

MDL

XF421EX MANUAL • CHAPTER 6: Functions (System Mode)

Accessing the Wing Type Selection Function

Press the +INCR or -DECR

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

or V-tail (VTL) mixing on or off

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

INDICATES WING TYPE FUNCTION

FPR = FLAPERON

VTL = V-TAIL

DLT = DELTA

WNG = WING TYPE SELECTION

OF = OFF

ON = ON

MIX

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

20 XF421EX MANUAL • CHAPTER 6: Functions (System Mode)

CHAPTER 6:Functions (System Mode) continued

To Activate Flaperon (FPR) Mixing (Wing Type Mode)

To Activate Delta Wing (DLT) Mixing (Wing Type 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

To 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

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 SCROLL and +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

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

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 - DECR

ENTER

AUX.CH.

+ INCR

ENTER

XF421EX MANUAL • CHAPTER 7: Functions (Function Mode)

Accessing the Sub-Trim Function

Press the +INCR or -DECR

button to adjust the sub-trim value

Press the SCROLL

button until

SB-TRIM

appears on the

screen

Press the

CHANNEL button

until the desired

channel appears

on the screen

SB-TRIM THR

THR : THROTTLE

AIL : AILERON

ELE : ELEVATOR

RUD : RUDDER

GER: LANDING GEAR

CHANNEL

INDICATES THE

SUB-TRIM FUNCTION

SUB-TRIM VALUE (±125)

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

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

INDICATES THE TRAVEL

ADJUSTMENT FUNCTION

TRAVEL ADJUSTMENT VALUE

SERVO OPERATING DIRECTION

Accessing the Travel Adjustment Function

TRAVEL ADJUSTMENT • Function Mode

7.3

TRAINER

SCROLL

CHANNEL - DECR

ENTER

AUX.CH.

+ INCR

ENTER

XF421EX MANUAL • CHAPTER 8: Data Sheet

DATA 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 ______________________

26 XF421EX MANUAL • IMPORTANT INFORMATION

IMPORTANT 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

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