Horizon Hobby XF421EX User Manual XF421EX Manual

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Document Title	XF421EX Manual
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5-CHANNEL COMPUTER RADIO
TABLE OF CONTENTS
2. Connections
2.1 Installation Requirements
2.2 Connections
3. Key Input and Display
4. Battery Alarm and Display
5. Input Mode and Functions
5.1 Normal Display
5.2 Mode Types
5.3 System Mode
5.4 Function Mode
6. Functions (System Mode)
6.1 Data Reset
6.2 Model Selection
6.3 Wing Type Selection
6.4 Model Name Entry
7. Functions (Function Mode)
7.1 Servo Reversing
7.2 Sub-Trim
7.3 Travel Adjustment
8. Data Sheet
10
10
III. IMPORTANT INFORMATION
I. INTRODUCTION
1. Using This Manual
2. Features
2.1 Transmitter Features
2.2 Receiver Features
2.3 Servo Features
2.4 Servo Layout
3. Specifications
3.1 System Specifications
3.2 Transmitter Specifications
3.3 Servo Specifications
3.4 Receiver Specifications
3.5 Charger Specifications
3.6 Airborne Battery Pack
4. Battery Charging
4.1 Transmitter/Receiver
4.2 Charger
5. Trainer System
II. XF421EX MANUAL
1. Transmitter Controls
1.1 Control Identification and Location
1.2 Receiver Channel Assignment/
Transmitter Throttle ALT
1.3 Transmitter Rear
1.4 Control Stick Length Adjustment
1.5 Direct Servo Control (DSC)
1.6 Neck Strap Attachment
10
11
11
12
12
1.
2.
3.
4.
5.
General Notes
Daily Flight Checks
Warranty Coverage
Repair Service Instructions
Frequency Chart
13
13
13
14
14
15
15
15
16
16
17
17
18
19
21
22
22
23
24
25
26
26
27
27
28
INTRODUCTION TO THE XF421EX RADIO SYSTEM
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
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
XF421EX MANUAL • Table of Contents
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
INTRODUCTION 1: Using This Manual
USING THIS MANUAL
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 2: Features
2.1
TRANSMITTER FEATURES
•
•
•
•
•
•
2.2
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
RECEIVER FEATURES
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.
XF421EX MANUAL • INTRODUCTION 1: Using This Manual / INTRODUCTION 2: Features
INTRODUCTION 2: Features
2.3
continued
SERVO FEATURES
517 Servo
• A .03ms deadband amplifier insures accurate
neutral centering.
• Low current drain.
2.4
•
•
Ball bearing supported ouput shaft
An indirect drive feedback potentiometer gives
additional protection from vibration.
SERVO LAYOUT
Servo Mounting Flange
Rubber Grommets
Servo Eyelet
Servo Mounting Flange
Rubber Grommets
Servo Arm Retaining Screw
Servo Arm/Horn
Servo Output Shaft
Servo Case
Servo Lead w/Connector
Top View
XF421EX MANUAL • INTRODUCTION 2: Features
INTRODUCTION 3: Specifications
3.1
SYSTEM SPECIFICATIONS
TYPE
3.2
AIRPLANE
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
TRANSMITTER SPECIFICATIONS
TYPE
3.3
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)
SERVO SPECIFICATIONS
TYPE
517BB
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
XF421EX MANUAL • INTRODUCTION 3: Specifications
INTRODUCTION 3: Specifications
3.4
continued
RECEIVER SPECIFICATIONS
TYPE
3.5
R600 FM
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
CHARGER SPECIFICATIONS
TYPE
3.6
AIRPLANE
MODEL NUMBER
NEC-211
INPUT VOLTAGE
AC 100-120V
OUTPUT CURRENT
50mAh Tx/50mAh Rx
CHARGING TIME
15 Hours
AIRBORNE BATTERY PACK
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
XF421EX MANUAL • INTRODUCTION 3: Specifications
INTRODUCTION 4: Battery Charging
4.1
TRANSMITTER / RECEIVER
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).
RIGHT SIDE OF TRANSMITTER
CENTER
PIN IS
NEGATIVE
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.
OUTSIDE IS POSITIVE
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.
4.2
BLACK TO POSITIVE
RED TO NEGATIVE
CHARGER PIGTAIL FOR RECEIVER
RED–POSITIVE / BROWN–NEGATIVE / ORANGE–SIGNAL
CHARGER
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.
CHARGER PIGTAIL FOR TRANSMITTER
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.
XF421EX MANUAL • INTRODUCTION 4: Battery Charging
INTRODUCTION 5: Trainer System
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
D.S.C.
all other current JR radios that have built-in trainer
systems. An optional trainer cord is needed
(JRPA130).
TRAINER
CORD INPUT
TRAINER BUTTON
MULTI
DATA
DISPLAY
TRAINER
SCROLL
VOLTAGE
INDICATOR
ENTER
TRAINER
AUX.CH.
ENTER
CHANNEL
+ INCR
SCROLL
- DECR
CHANNEL
VOLTAGE
INDICATOR
AUX.CH.
ENTER
+ INCR
- DECR
ON
FUNCTION 3-4 1-4
MULTI
DATA
DISPLAY
ENTER
ON
FUNCTION 1-2 2-3
OPTIONAL
TRAINER CORD
(JRPA130)
5 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM
MASTER TX
POWER SWITCH ON
FUNCTION 3-4 1-4
FUNCTION 1-2 2-3
5 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM
SLAVE TX
POWER SWITCH OFF
Operating the Trainer System
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.)
XF421EX MANUAL • INTRODUCTION 5: Trainer System
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.
CHAPTER 1: Transmitter Controls
1.1
CONTROL IDENTIFICATION AND LOCATION • Mode II
ANTENNA
LCD SCREEN
THROTTLE TRIM
ELEVATOR TRIM
CARRYING HANDLE
INPUT KEY
TRAINER SWITCH
GEAR SWITCH
INPUT KEY
THROTTLE/RUDDER STICK
AILERON/ELEVATOR STICK
NECK STRAP EYELET
RUDDER TRIM
AILERON TRIM
POWER SWITCH
1.2
RECEIVER CHANNEL ASSIGNMENT/TRANSMITTER THROTTLE ALT
1.
2.
3.
4.
5.
10
THRO Throttle Channel
AILE Aileron Channel
ELEV Elevator Channel
RUDD Rudder Channel
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.
XF421EX MANUAL • CHAPTER 1: Transmitter Controls
CHAPTER 1: Transmitter Controls
1.3
continued
TRANSMITTER REAR
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.
1.4
CONTROL STICK LENGTH ADJUSTMENT
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.
XF421EX MANUAL • CHAPTER 1: Transmitter Controls
SET SCREW
LOOSEN
TIGHTEN
11
CHAPTER 1: Transmitter Controls continued
1.5
DIRECT SERVO CONTROL (DSC)
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.
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.
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.
1.6
NECK STRAP ATTACHMENT
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)
12
A - Charge Cord/DSC Receptacle
B - Switch Harness Lead
C - Charger/DCS Cord
so that the transmitter will be perfectly balanced when
a neck strap is used.
XF421EX MANUAL • CHAPTER 1: Transmitter Controls
CHAPTER 2: Connections
2.1
INSTALLATION REQUIREMENTS
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.
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
2.2
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.
CONNECTIONS
RECEIVER BATTERY
4N-600
ON
OFF
ON/OFF SWITCH HARNESS
(JRPA003)
GEAR
2MHz
RUDDER
NEW ABC & W SYSTEM
6 CHANNEL RECEIVER
6 CH 72MHz FM RECEIVER
ABC&W INTERFERENCE
PROTECTION SYSTEM
BATT
B AT
AUX
AUX
GEAR
GEAR
ELEVATOR
RUDD
RUDD
ELEV
ELEV
NER-226X
A IAILE
LE
JAPAN REMOTE CONTROL CO., LTD
MADE IN JAPAN
THRO
THRO
226X
RECEIVER
R600
RECEIVER
AILERON
ANTENNA
THROTTLE
XF421EX MANUAL • CHAPTER 2: Connections
13
CHAPTER 3: Key Input and Display
KEY INPUT 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.
TRAINER
SCROLL
ENTER
AUX.CH.
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.
+ INCR
- DECR
CHANNEL
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).
CHAPTER 4: Battery Alarm and Display
BATTERY ALARM AND DISPLAY
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).
14
BAT
FLASHING
8.9V
XF421EX MANUAL • CHAPTER 3: Key Input and Display / CHAPTER 4: Battery Alarm and Display
CHAPTER 5: Input Mode and Functions
5.1
NORMAL DISPLAY
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.
5.2
MDI
I0.4V
MODEL NAME
BATTERY VOLTAGE
MODE TYPES
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
XF421EX MANUAL • CHAPTER 5: Input Mode and Functions
Function Mode includes programming that is more
frequently changed, sometimes at the flying field.
Function Modes include:
SERVO REVERSING
SUB-TRIM
TRAVEL ADJUST
15
CHAPTER 5: Input Mode and Functions
5.3
continued
SYSTEM MODE
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.
Programming Button
Programming Button
TRAINER
SCROLL
ENTER
RST
CHANNEL
ON
Power Switch
5.3
RST
MDL
MIX
WNG
OF
AUX.CH.
ENTER
+ INCR
- DECR
MIX
MDI
To enter Systen Setup Mode
press both programming
buttons up and turn on the
Power Switch
MODEL SELECTION
Page 19
WING TYPE
SELECTION
FPR FLAPERON
DELTA
V-TAIL
Page 20–21
MODEL NAME ENTRY
Page 22
FUNCTION MODE
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.
THR
REV•NORM
SB-TRIM
TRV ADJ
TRAINER
SCROLL
ENTER
THR
REV•NORM
CHANNEL
ON
Power Switch
AUX.CH.
ENTER
+ INCR
THR
Programming Button
Programming Button
16
DATA RESET
Page 18
THR
+I00
SERVO REVERSING
Page 23
SUB-TRIM
Page 24
TRAVEL ADJUSTMENT
Page 25
- DECR
To enter Function Mode
turn on the Power Switch
and then press both
programming buttons up
XF421EX MANUAL • CHAPTER 5: Input Mode and Functions
CHAPTER 6: Functions (System Mode)
6.1
DATA RESET • 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
RST
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.
INDICATES DATA RESET FUNCTION
MODEL NUMBER TO RESET
TRAINER
SCROLL
ENTER
CHANNEL
In System Setup Mode
press the SCROLL button up
until RST appears on
the screen
RST
AUX.CH.
ENTER
+ INCR
- DECR
Press the CHANNEL button down and
+INCR button up simultaneously
to reset the data (a beep will sound)
Accessing the Data Reset Function
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
XF421EX MANUAL • CHAPTER 6: Functions (System Mode)
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.
17
CHAPTER 6: Functions (System Mode)
6.2
continued
MODEL SELECTION • System Mode
The XF421EX has memory for two models.
MDL
INDICATES MODEL SELECTION FUNCTION
TRAINER
SCROLL
ENTER
CHANNEL
MODEL NUMBER 1 OR 2
MDL
In System Setup Mode
press the SCROLL button
until MDL appears on
the screen
AUX.CH.
ENTER
+ INCR
- DECR
Press the +INCR or -DECR
button to select model number 1 or 2
Accessing the Model Selection Function
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.
18
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.
XF421EX MANUAL • CHAPTER 6: Functions (System Mode)
CHAPTER 6: Functions (System Mode)
6.3
continued
WING TYPE SELECTION • System Mode
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.
MIX
OF
TRAINER
SCROLL
ENTER
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.
INDICATES WING TYPE FUNCTION
FPR = FLAPERON
VTL = V-TAIL
DLT = DELTA
WNG = WING TYPE SELECTION
OF = OFF
ON = ON
MIX
AUX.CH.
ENTER
OF
CHANNEL
Press the SCROLL
button until MIX
WNG appears on
the screen
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.
Press the CHANNEL
button to select
Wing Type (WNG) or
V-tail (VTL) mixing
+ INCR
- DECR
Press the +INCR or -DECR
button to turn the flaperon (FPR), Delta (DLT)
or V-tail (VTL) mixing on or off
Accessing the Wing Type Selection Function
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.
XF421EX MANUAL • CHAPTER 6: Functions (System Mode)
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.
19
CHAPTER 6: Functions (System Mode)
6.3
continued
WING TYPE SELECTION • System Mode (continued)
To Activate Flaperon (FPR) Mixing (Wing Type Mode)
TRAINER
SCROLL
ENTER
MIX
WNG
ENTER
1. In System Setup Mode
press the SCROLL button
until MIX WNG appears
on the screen
FPR
MIX
AUX.CH.
OK
CHANNEL
+ INCR
OF
- DECR
OF = MIX OF
ON = MIX ON
2. Press the +INCR button to
activate Flaperon mixing
To Activate Delta Wing (DLT) Mixing (Wing Type Mode)
TRAINER
SCROLL
ENTER
MIX
WNG
1. In System Setup Mode
press the SCROLL button
until MIX WNG appears
on the screen
MIX
AUX.CH.
ENTER
OK
CHANNEL
+ INCR
OF
- DECR
2. Press the -DECR button to
activate Delta wing mixing
MIX
DLT
DELTA WING
MIX ON
ON
To Activate V-Tail (VTL) Mixing
TRAINER
SCROLL
ENTER
CHANNEL
1. In System Setup
Mode press the
SCROLL button until
MIX WNG appears
on the screen
MIX
WNG
ENTER
OK
+ INCR
OF
- DECR
2. Press the CHANNEL
button once to access
the V-tail mixing screen
Note: It is also possible to activate both the flaperon (FPR)
and V-tail functions (VTL) to work simultaneously.
20
MIX
AUX.CH.
3. Next press either
the +INCR or
-DECR buttons
once to activate
V-tail mixing
MIX
VTL
ON
XF421EX MANUAL • CHAPTER 6: Functions (System Mode)
CHAPTER 6: Functions (System Mode)
6.4
continued
MODEL NAME ENTRY • System Mode
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
TRAINER
SCROLL
ENTER
CHANNEL
In System Setup Mode
press the SCROLL
button until MD1 appears
on the screen
MDI
Press the CHANNEL button
to select the character to be
changed (flashing)
is useful to help identify different aircraft types or
model setups.
Flashing Character includes
character to be adjusted
AUX.CH.
ENTER
+ INCR
- DECR
Press the +INCR or -DECR
buttons to select the desired
character (A-Z, 1-9, etc.)
ACI
CURRENT MODEL
NUMBER
Accessing the Model Name Entry Function
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).
XF421EX MANUAL • CHAPTER 6: Functions (System Mode)
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.
21
CHAPTER 7: Functions (Function Mode)
7.1
SERVO REVERSING • 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
THR
REV◆NORM
corresponding stick movement. Servo reversing is
available for all channels.
CHANNEL
TRAINER
SCROLL
THR : THROTTLE
AIL : AILERON
ELE : ELEVATOR
RUD : RUDDER
GER : LANDING GEAR
AUX.CH.
ENTER
ENTER
Press the SCROLL
button until
REV◆NORM
appears on the
screen
+ INCR
- DECR
CHANNEL
Press the
CHANNEL button
until the desired
channel appears
on the screen
Press the +INCR or -DECR
button to change the servo direction
Accessing the Servo Reversing Function
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.
22
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.
XF421EX MANUAL • CHAPTER 7: Functions (Function Mode)
CHAPTER 7: Functions (Function Mode)
7.2
continued
SUB-TRIM • Function Mode
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.
INDICATES THE
SUB -TRIM FUNCTION
THR
SB-TRIM
TRAINER
SCROLL
ENTER
CHANNEL
THR : THROTTLE
AIL : AILERON
ELE : ELEVATOR
RUD : RUDDER
GER : LANDING GEAR
SUB -TRIM VALUE ( ±125)
AUX.CH.
ENTER
Press the SCROLL
button until
SB-TRIM
appears on the
screen
+ INCR
- DECR
CHANNEL
Press the
CHANNEL button
until the desired
channel appears
on the screen
Press the +INCR or -DECR
button to adjust the sub-trim value
Accessing the Sub-Trim Function
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.
XF421EX MANUAL • CHAPTER 7: Functions (Function Mode)
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.
23
CHAPTER 7: Functions (Function Mode)
7.3
continued
TRAVEL ADJUSTMENT • Function Mode
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.
INDICATES THE TRAVEL
ADJUSTMENT FUNCTION
CHANNEL
THR
TRV ADJ.
+ I00%
THR : THROTTLE
AIL : AILERON
ELE : ELEVATOR
RUD : RUDDER
GER : LANDING GEAR
TRAVEL ADJUSTMENT VALUE
SERVO OPERATING DIRECTION
TRAINER
SCROLL
AUX.CH.
ENTER
ENTER
Press the SCROLL
button until
TRV ADJ.
appears on the
screen
+ INCR
- DECR
CHANNEL
Press the
CHANNEL button
until the desired
channel appears
on the screen
Press the +INCR or -DECR
button to adjust the travel adjustment value
Accessing the Travel Adjustment Function
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
24
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.
XF421EX MANUAL • CHAPTER 7: Functions (Function Mode)
CHAPTER 8: Data Sheet
DATA SHEET
Model Number _____________________
Model Name ______________________
CHANNELS
THRO (1)
AIL (2)
ELE (3)
RUDD (4)
GER (5)
NORM
•
REV
NORM
•
REV
NORM
•
REV
NORM
•
REV
NORM
•
REV
REVERSE SW
SUB TRIM
TRAVEL ADJUST
% +
% +
% +
% +
(TRV ADJ.)
% +
% +
% +
% +
WING TYPE
NORM
•
FLAPERON
•
DELTA
V-TAIL
ON • OFF
XF421EX MANUAL • CHAPTER 8: Data Sheet
25
IMPORTANT INFORMATION
GENERAL NOTES
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 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.
DAILY FLIGHT CHECKS
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:
26
• 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 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.
XF421EX MANUAL • IMPORTANT INFORMATION
WARRANTY AND SERVICE INFORMATION
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 COVERAGE
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.
REPAIR SERVICE INSTRUCTIONS
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.
XF421EX MANUAL • WARRANTY AND SERVICE IMFORMATION
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
27
FREQUENCY CHART
FREQUENCY CHART
72 MHz requires no special license to operate.
50/53 MHz requires the operator to have an FCC
amateur radio license (Ham).
72 MHz
CH.NO.
FREQUENCY
72 MHz
CH.NO.
50MHz
FREQUENCY
CH.NO.
15
72.090
36
72.510
00
50.800
16
72.110
37
72.530
01
50.820
17
72.130
38
72.550
02
50.840
18
72.150
39
72.570
03
50.860
19
72.170
40
72.590
04
50.880
20
72.190
41
72.610
05
50.900
21
72.210
42
72.630
06
50.920
22
72.230
43
72.650
07
50.940
23
72.250
44
72.670
08
50.960
24
72.270
45
72.690
09
50.980
25
72.290
46
72.710
26
72.310
47
72.730
27
72.330
48
72.750
28
72.350
49
72.770
29
72.370
50
72.790
30
72.390
51
72.810
31
72.410
52
72.830
32
72.430
53
72.850
33
72.450
54
72.870
34
72.470
55
72.890
35
72.490
56
72.910
57
72.930
58
72.950
59
72.970
60
72.990
FREQUENCY
53 MHZ
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
*Channels 11–14 are not available
28
XF421EX MANUAL • FREQUENCY CHART
NOTES
NOTES
®
DISTRIBUTED EXCLUSIVELY BY HORIZON HOBBY DISTRIBUTORS CHAMPAIGN, IL 61822
www.horizonhobby.com
© 1999 Horizon Hobby Distributors, Inc. All Rights Reserved.

---

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Title                           : XF421EX Manual
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