Horizon Hobby XF421EX User Manual XF421EX Manual
Horizon Hobby, LLC XF421EX Manual
XF421EX Manual
5-CHANNEL COMPUTER RADIO
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
10
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
1
•
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
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 FEATURES2.3
SERVO LAYOUT
2.4
Servo Mounting Flange
Rubber Grommets
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
7
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
9
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
ON
FUNCTION 3-4 1-4 FUNCTION 1-2 2-3
MULTI
DATA
DISPLAY
VOLTAGE
INDICATOR
ON
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
11
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
B
C
A - Charge Cord/DSC Receptacle
B - Switch Harness Lead
C - Charger/DCS Cord
NECK STRAP ATTACHMENT1.6
13
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
ON
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
7
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).
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
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
ON
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
I
ON
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
0
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
I
MDL
OF
WNG
MIX
I
I
MDI
MIX
Programming Button Programming Button
Programming Button Programming Button
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.
DATA RESET • System Mode
6.1
TRAINER
SCROLL
CHANNEL - DECR
ENTER
AUX.CH.
+ INCR
ENTER
RST
I
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
I
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
I
19
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
OF
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
OF
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
OF
FPR
MIX
OF = MIX OF
ON = MIX ON
OF
ON
DLT
MIX
MIX
2. Press the CHANNEL
button once to access
the V-tail mixing screen
DELTA WING
MIX ON
OF
ON
VTL
MIX
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
OK
WNG
MIX
OK
WNG
MIX
OK
WNG
MIX
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 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
I
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
I
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 - DECR
ENTER
AUX.CH.
+ INCR
ENTER
23
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
0
THR : THROTTLE
AIL : AILERON
ELE : ELEVATOR
RUD : RUDDER
GER: LANDING GEAR
CHANNEL
1
2
3
4
5
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
1
2
3
4
5
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
25
XF421EX MANUAL • CHAPTER 8: Data Sheet
DATA SHEET
CHAPTER 8:Data Sheet
8
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
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
1
DAILY FLIGHT CHECKS
2
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 INFORMATION
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
3
4
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
5
72 MHz
FREQUENCY CHART
*Channels 11–14 are not available
NOTES
NOTES
DISTRIBUTED EXCLUSIVELY BY HORIZON HOBBY DISTRIBUTORS CHAMPAIGN, IL 61822
www.horizonhobby.com
© 1999 Horizon Hobby Distributors, Inc. All Rights Reserved.
®