HITEC Focus 4 Operation Manual

4 CHANNEL F.M. SYSTEM AIRCRAFT

OPERATION MANUAL

ENGLISH

1. Contents

1. Contents ..............................................................................................1.

2. Features & specifications ...................................................................2.

A. Transmitter
B. Receiver
C. Servo

3. Transmitter function ..........................................................................3.

A. Front
B. Back

4. Receiver & servo connection ..............................................................4.

5. Operation & adjustment ....................................................................5.

A. Control stick tension & length & trim lever adjustment
B. Servo reverse
C. Aileron and elevator & rudder & throttle A.T.V.
D. Innovative MASTER-STUDENT trainer system

6. Installation .........................................................................................7.

The Hitec Focus digital proportional radio control system is a highly

sophisticated system that features modern solid state circuit design and components of
unsurpassed reliability. The time you spend learning about your Focus from this manual
will ensure you that you will enjoy many years of dependable control.

- 1 -

A. Transmitter

! 4 channel P.P.M/F.M transmitter
! AMA listed 1991 F.M system and RCMA gold stickered transmitters.
! High quality precision gimbal stick with adjustable length & tension.
! All channel servo reversing
! ATV for aileron, elevator, rudder, throttle
! Trainer system
! Innovative "MASTER-STUDENT' trainer cable system

Operating system : 2 stick system
Module change system : Internal module system
Power supply : 9.6V (8 Ni-CAD batteries)
Current drain : 150mA (13.5) -130mA (10.8)

B. Receiver (Ultra series)

! X-TAL interchangeable
! Ultra narrow band width for maximum adjacent channel rejection.
! Minimized 2nd & 3rd order intermodulation
! Metallic noise proof

Intermediate frequency : 455 KHz, 10.7 MHz
Power supply : 4.8V (4 NiCd battery) AA size
Current drain : 22mA
Dimensions : 37 x 61x22 mm (1.5" x2.4" x0.9")
Weight : 45.50g(1.66oz)
Receiving range : 1,000 ft or greater in the air
Working voltage : 3.7-7.0V

C. Servo

! Top oilite bearing prevents wearing out of the top plastic case
! Indirect drive for gear train protection
! Hitec custom designed 1.C with narrow dead band & high trackability
! SMT(surface Mount Technology) circuitry adopted.
! Precise & sturdy heavy duty gears improve high neutral position and

minimal backlash.
Control system : + pulse width control (1550 uS/N)
Operating angle : One side 45deg or more (including trim)
Power supply : 4.8V (4 NiCd) or 6V (4 alkaline battery) AA size.
Current drain : 8mA at 6.0V (stopped)
Output torque : 3.0kg/cm (41 oz in)
Operating speed : 0.21 sec/60deg
Dimensions : 41x20x36mm (1.6x0.8"x 1.4")
Weight : 1.51oz(43g)

- 2 -

2. Features & specifications

- 3 -

Aileron/Elevator stick in MODE II
Throttle/Rudder stick in MODE II
Aileron trim
Elevator trim
Throttle trim
Rudder trim
Trainer ON-OFF switch
lSJ Level meter
Power switch
Rod antenna
Neck-strap connector
Recharge Jack

"Power switch should be off when

charging”

Crystal
Handle
Aileron & elevator and rudder and
throttle adjustable travel volume(A.T.V)
Servo reversing switches
Nicad-battery
Trainer Jack

Unlike conventional trainer system, our
trainer cable designates the"MASTER" end &
"STUDENT' end. When connected properly,
the student transmitter will not activate even if
the student accidently turns his radio "ON".

A. Front

Fig 1

3. Transmitter function

1 13
2

14
3 15
4 16
5 17
6 18
7 19
8
9

10

11

12

- 4 -

B. Back

4. Receiver & servo connection

Fig 2

Fig 3

- 5 -

The unique open-stick assembly
provides fully adjustable stick tension
"feel". Turning the tension adjustment
screw clockwise will soften ( decrease
the tension ) the feel of the control stick,
(fig 4).

CP-variable resistors improve
the neutral characteristics and
resolution of the servo positioning.

All of the molded parts are
fabricated from high-grade
polycarbonate that is unaffected by
temperature and humidity.

Turn with a Phillips
screwdriver
The spring becomes
stronger when the
screw is turned
counterclockwise

Fig 4

5. Operation & adjustment

A. Control stick length & tension & trim lever adjustments

The length of the nonslip control sticks can be adjusted to suit the requirements of the
operator. (fig-5)

The trim lever on each control stick is used to correct ( trim out ) flight
characteristics. After the initial test flight note the positions of the control surfaces that
required trim. Next center trim levers, turn off the receiver radio. Now adjust the control
devices of the surfaces that required trim so that the surfaces are in the same position before
the trim levers were re-centered. Turn on the receiver radio and recheck the control surface to
ensure that all the corrections were applied in the correct direction.

Adjusting knob

! Unlock

! Set to the desired length by

turning the knob, then lock.

Fig 5

B. Servo reverse

The Focus 4 F.M transmitter is equipped with servo reversing on all 4channels.

E. Innovative MASTER-STUDENT trainer system

Pulling down the trainer switch will switch over the control to the student transmitter.
Releasing the switch will enable master transmitter to resume control. When attaching the
trainer cable (optional item sold separately. Spare part # 8310 : one way trainer cord) the cable
must be connected to the correct side as the .master side should be connected with the master
transmitter. The purpose is obvious. Connected properly, the student transmitter cannot be
activated even if it is accidentally turned on, a unique feature not present in other systems.

( Note : Leaving the reverse switch in the middle will cause the radio to work

erratically so please make sure that the switches are all pushed to the furthest end. )

C. Aileron and elevator & rudder & throttle adjustable travel volume (A.T.V.)

This function adjusts the servo left and right throws on aileron and elevator and

rudder and throttle. The rate setting range is 30% to 110%.

- 6 -

REV

REW

AJRRUDD

NORM

REVERSE SWITCHREVERSE SWITCH

THRO

Fig 6

Fig 8

ATV

AIL ELEV THRO

RUDD

NEUTRAL

FULL THROW

REDUCED

THROW

Fig 7

6. Installation

! Connect the servos, batteries and switch harness in accordance with fig 3. Carefully

check to ensure that all connectors are properly seated.

! Turn the power switches "ON" and operate the transmitter. Observe the direction of travel

of the control surfaces to see if they correspond to the control stick movement. Improper
servo direction is corrected with the servo reverse dip switches, (fig 3)

! Operate each servo over its entire range and check for binding of the push rods. Correct

as necessary. Hold each control stick at its extreme position and listen for servo hum. The
hum indicates that the control linkage is too tight for the amount of servo travel. This is
corrected with the end point adjustment or by lengthening the push rods.

! Applying unreasonable force to a servo output arm will adversely affect the servo and

quickly drain the flight batteries. Therefore, all control linkages should operate as
smoothly and as frictionless as possible. Use Hitec "Jam Check'r" to assure smooth, safe
control setups.

! When installing the switch, cut a rectangular hole somewhat larger than the full stroke of

the switch, then install the switch so it moves smoothly from ON to OFF.

! The length of the receiver antenna is critical to the reception of signals transmitted,

therefore DO NOT cut or bundle the antenna wire, make every effort to keep the antenna
wire fully extended.

! Protect the receiver from excessive vibration by wrapping it in sponge rubber (note: Use

Hitec "Flight Preserver : #8480"). Next place the receiver in a plastic bag. Secure the
plastic bag with rubber bands to keep out moisture and dust.

! Collapse the transmitter antenna fully and operate the system from a distance of 60 to 90

feet. The system should function flawlessly. If it does not, check to see that the receiver
and transmitter batteries are at maximum capacity.

Charging Instructions

! Before first use of Focus system, connect appropriate charge connectors from charger to

transmitter and receiver switch harness with battery connected.

! With transmitter and receiver switched OFF, plug charger into 110-120V AC and be sure

the RED & GREEN charge lights are ON. If either charger light is OFF, re-check
connections to charger and be sure switches on transmitter and receiver are OFF.

! Charge for 24 hours first before further use of system. This conditions the batteries for

full-charge capacity.

! Re-charge 16-20 hours immediately before each flying day.

PRINTED IN KOREA