Tactic’s TTX850 computer transmitter uses
the advanced 2.4GHz spread spectrum SLT
“Secure Link Technology” protocol for solid,
interference-free control of R/C models. A
large backlit LCD, wired and wireless trainer
systems, 30 model memories, plus advanced
programming options are just a few of the
benefits which can be used for models of all
sizes. Tactic 2.4GHz transmitters are compatible only with Tactic brand receivers and
those utilizing the SLT protocol.
™
For safe operation and
best results, it’s strongly
recommended to read
this manual in its entirety before
use! Also read and understand the
instructions included with the model.
Damage resulting from misuse or
modification will void your warranty.
SLT technology ensures that transmitters emit a strong, clear, frequency-hopping
2.4GHz signal, and that your compatible receiver accepts no signal except yours.
™
Linking Tactic brand receivers is as simple as pushing a button, which creates a
locked-in, interference free link. The TTX850 is also compatible with non-Tactic
brand receivers which use the *SLT protocol, for the ultimate in convenience and fl exibility.
* Make sure optional receivers have the genuine SLT protocol before use with the TTX850.
The TTX850 is also compatible with all transmitter-ready aircraft bearing the
“Tx-R” logo. Such aircraft include receivers having the SLT protocol.
RECEIVER INSTALLATION
Always mount the optional receiver, servos, switch harness, bat ter y, el e ctronic speed control, etc. as expl ained
in the manual included with such equipment and/or the model. Keep the Rx and its antenna(s) as far away
from the engine/motor, servos, and ESC and other electronic items as possible. It may also be a good idea
to mount the Rx inside certain models using Velcro,® and wrap it in foam rubber to prevent damage from
strong vibrations or crash damage (except in extremely warm environments). It’s best to have as few items
surrounding the receiver’s antenna tips as possible inside the model, to allow for the most obstruction-free
signal path to the transmitter. Exposing the receiver’s antenna tip outside the model is recommended if
possible. For receivers with two antennas, position the antennas at 90 degree angles with the tips resting
at least 5 inches apart. If possible, allow one antenna to point vertically above the receiver itself.
TM
3
TTX850 POWER SYSTEM
INPUT POWER
One assembled 4.8V 1000mAh nickel-metal hydride (NiMH) battery pack is included. Optional 1.2V NiCd
or 1.5V alkaline batteries can be used with an optional 4-cell fl at battery holder with universal connector.
Do not mix cell types, or old and new cells, etc.
Battery voltage is shown on the LCD’s home screen for easy monitoring. A “LOW BATTERY” warning will
show when battery power drops to the voltage value shown in the BATTERY ALARM screen as described
on page 8.
WARNING ! Never operate an R/C model with weak Tx batteries! Reduced operational
range and/or possible loss of control of the aircraft could result. Replace weak alkaline
batteries, or re-charge NiCd or NiMH batteries, before attempting a fl ight!
A “Tx Battery” timer in the TIMER menu described on page 18 can track the total amount of time the
transmitter has been operational.
See the ACCESSORIES section on page 28 for optional batteries and chargers available at local hobby
retailers.
CHARGE JACK AND CHARGING RECHARGEABLE BATTERIES
The charge jack should only be used for rechargeable batteries. Do not try to
re charge alkaline bat terie s. Charge ad apter s for Futa ba® brand transmitters are
compatible, with the center pin being positive polarity. The Tx power switch must
TTX850 Charge Jack
12 hours. Charge is being delivered to the battery when the charger’s LED is red. The battery is fully charged
when this LED is green, and the charger should be disconnected. Do not allow charger to remain connected
indefi nitely. Do not charge batteries at greater than 1 amp. Cycling of the Tx batteries can be accomplished
through this jack. Misuse, improper charging, or over-charging of rechargeable cells can result in damage
to the cells that could include cell rupture, explosion, or fi re!!
be in the OFF position to recharge batteries. For depleted batteries, connect
the included TC100 charger to the Tx charge jack and allow to charge for 10 to
WARNING ! Do not accidentally short circuit the terminals inside the charge jack, as
this can cause permanent damage to the radio’s charge circuitry and battery and void
the warranty.
POWER LED
The blue LED illuminates when the power switch is turned on and ample voltage is supplied by the battery.
This LED will fl ash if battery voltage drops to the voltage set in the BATTERY ALARM setting described
on page 8.
FLIGHT CONTROLS
All channels are fully proportional, depending if controlled by a switch or mixed to another proportional
channel. Channels 5-8 can be controlled by a non-proportional switch or proportional side lever. However,
if a proportional channel (1-4) is mixed to channel 5-8 these channels can provide proportional control.
Aircraft control is accomplished through various devices by the pilot (sticks, switches, etc.), and other control
4
inputs can be manipulated electronically by the Tx to alter the control signals before they are delivered to the
receiver (mixes, exponential, etc.). Some electronic functions can be turned on/off by the pilot during fl ight
such as a timer. Other functions can only be altered while the model is on the ground, such as changing
travel limits or reversing for a particular channel.
For multi-rotors, sideways movement of the aileron control (right stick for radios set on mode 2) controls
right / left movement. Up/down movement of the elevator control (right stick for mode 2) controls forward/
backwards movement. Pushing the stick towards the Tx handle moves the nose of the model forward; pulling
the stick down away from the handle moves the nose of the model backwards. Up/down movement of the
throttle control (left stick for mode 2) increases motor speed (RPM) and controls the up / down movement.
Pushing the stick up (towards the Tx handle) moves the model up vertically. Pulling the stick down (away
from the handle) moves the model downward. Sideways movement of the rudder control (left stick for mode
2) controls clockwise/counter-clockwise rotation of the model.
GIMBAL STICKS
Ball-bearing construction allows both sticks to provide the ultimate in smooth, precise control. Stick length
can be adjusted for optimum feel and control. Each stick consists of a base and a tip. To adjust, hold the base
tightly, then loosen the tip by turning it counter-clockwise. Adjust the stick tip to the desired length. Tighten
the stick by holding the tip in place and turning the base counter-clockwise until it’s tight against the tip.
STICK TENSION AND THROTTLE RATCHET
Each control stick can be adjusted for softer or stiffer movement tension. A ratchet is also included for the
throttle stick which can be adjusted for feel depending on personal preference. Adjustment of either feature
requires removal of the rear of the Tx case as explained in the CASE SEPARATION AND ASSEMBLY
section below.
CASE SEPARATION AND ASSEMBLY
WARNING ! Failure to follow these instructions for separating and re-assembling the Tx
case can result in permanent damage to the transmitter and void the warranty. Contact
Hobby Services if you do not feel comfortable that you can safely and accurately perform
these steps.
ALWAYS disconnect and remove the batteries from the battery compartment FIRST. Failure to
do so can result in permanent damage to the Tx.
Remove the six screws from the back of the Tx case. Carefully pull the case rear away from the case
front and note exactly how all wires are routed inside the case.
After adjustments are made as described in other sections of this manual, close the case by fi rst carefully
tucking all cables back inside as when the case was opened. Align the case rear back onto the case front,
making sure that no wires are pinched between the case parts. Press the case halves together. Insert
the screws back into their positions and carefully tighten them until snug - making sure not to cross the
threads or over-tighten the screws. Re-connect the battery holder’s connector to the socket inside the
Tx. Insert the battery into the compartment, and carefully tuck the wires inside the cavity so they do not
become pinched when the door is closed. Close the battery door.
5
STICK TENSION: Silver s crews on the
back of each gim bal are used to adjust the
stick tension. Turn the screw clockwise to
make stick tension more fi rm. Turn the
screw counter-clockwise to make stick
tension more light.
THROTTLE RATCHET: A silver ratchet
bar is mounted across the throttle gimbal.
For smooth throttle feel for helicopter use,
you may wis h to remove this bar. Remove
both screws which hold the ratchet bar then
remove the bar.
DIGITAL STICK TRIMS
The trim controls for the four main
channels are digital. Holding the trim
lever will cause the servo output to move
repeatedly. Trim positions are visible
on the LCD’s home screen, and stored
into that respective memory. Changing
the model memory will also cause trim
settings to change accordingly.
For aircraft with glow engines, the precise
position of the trim lever is helpful when determining the engine’s preferred idle point. When the throttle
stick is above 50% full throttle it will not be possible to trim the throttle servo – even though the indicator
on the LCD will move.
Left stick,
up/down
tension
ratchet
Left stick,
sideways
tension
adjustment
Right stick,
up/down
tension
adjustment
Right stick,
sideways
tension
adjustment
6
The amount of servo movement for each increment of a digital trim can be adjusted as desired, as explained
in the TRIM STEP SETTING section on page 12.
TOGGLE SWITCHES
Each switch can be assigned to control one of a variety of functions as desired and described throughout
this manual. The identifi cation of each switch by letter is marked on the Tx. The factory default switch
assignments are as follows:
Trainer
(no setting)
(no setting)
(no setting)
(no setting)
Helicopter
Timer Control
Gyro Gain
(no setting)
Ail/Ele/Rud D/R
Normal/Idle-up
Throttle Cut
(no setting)
Throttle Hold
(no setting)
(no setting)
Multi-Rotor
Timer Control
Gyro Gain
(no setting)
Ail/Ele/Rud D/R
(no setting)
(no setting)
(no setting)
Throttle Hold
(no setting)
(no setting)
HOME SCREENLCD, PROGRAMMING CONTROLS, MENU NAVIGATION
LCD contrast and backlight intensity are adjustable for optimum viewing. Six pushbuttons navigate
the menus and settings. Single button pushes will result in a single incremental adjustment on-screen.
Holding a button for a short time will result in slow scrolling of adjustments; continued holding will result
in fast adjustments.
LEFT SIDE BUTTONS
Press any time to see the servo position screen. Indicators for certain channels will change
depending on model type, wing type, etc. Moving any Tx control will graphically be shown
on this screen. When setting / adjusting mixes to determine if the mix is as desired, set the mix and then
view this screen. Move all controls to determine if the mix moves each respective channel as needed.
Quickly resets certain values and settings back to factory defaults. Press to backspace in
the model and user name screens.
Jumps back to the previous screen, and removes certain pop-up messages from the screen.
RIGHT SIDE BUTTONS
Adjustment of values on-screen.
Moves the cursor up, and increases highlighted values/settings.
Moves the cursor down, and decreases highlighted values/settings.
To select or de-select a setting, or enter a screen. Press briefl y to access the SETTINGS
menu. Press and hold to access the MODEL SETUP menu.
MENUS
The TTX850 has three types of menus.
The SYSTEM SETUP menu allows for setting basic operational functions for the radio itself.
Selecting and managing the model memories, confi guring the radio for the structure of the airplane, helicopter,
or multi - rotor is done in the MODEL SETUP menu. Most functions apply for all model types. Select functions
are available for certain model types only.
Setting various radio functions to control the model is done in the SETTINGS menu. Some settings apply
for all model types, while certain functions are available for certain model types only.
SYSTEM SETUP
Fundamental settings for the transmitter itself are located in this menu. With the power switch in the OFF
position, press and hold ENTER, turn the power switch ON and wait for the SYSTEM SETUP screen to
show. Move the cursor and press ENTER to select any setting. Press and to change setting s. Pr ess
ENTER to confi rm the setting.
7
USER NAME
Enter your name to identify the radio. The cursor will be under the fi rst character. Press ENTER to highlight
this character. Press and to fi nd the desired character, then ENTER to confi rm. The cursor will
automatically move to the next cursor. Repeat as necessary for up to 11 characters. Pressing CLEAR will
move the cursor back one space and erase the character in that space. Press ESC when fi nished.
STICK MODE
The TTX850 is factory set to Mode 2 confi guration,
but can be changed to Mode 1, 3, or 4 as explained
be low. To change m odes in the pro gramming, move
the cursor to the STICK MODE line, highlight and
press ENTER, then press or to fi nd the
desired mode. Press ENTER to confi rm.
In addition to programming changes, stick mode changes require relocation of gimbal stick parts to achieve
the proper control. Go to www.tacticrc.com and click on the TTX850 link to fi nd directions for how to change
gimbal settings.
Mode
1
2
3
4
Left Stick
elevator/rudder
throttle/rudder
aileron/elevator
throttle/aileron
Right Stick
throttle/aileron
aileron/elevator
throttle/rudder
elevator/rudder
CONTRAST
Adjust the LCD’s contrast level for optimum viewing.
SPEAKER VOLUME
Adjust the loudness of the radio’s beeper as desired. This volume setting affects all tones that are emitted
from the radio including trim adjustments, alarms, programming changes, etc. Speaker volume for all alarms
is not adjustable.
BATTERY ALARM
An alarm will sound and the display will show a warning when the Tx battery’s voltage drops to the level
shown in this setting. Do NOT set this value too low, as the radio could lose power very rapidly as the
battery nears full discharge and cause a loss of control of the model. Land the model immediately once
this alarm has sounded!
VIBRATION POWER
Turn the vibration feedback ON or OFF.
BACK LIGHT
Adjust the intensity of the LCD’s red backlight.
Once all functions in this menu are set, press ESC to return to the home screen.
MODEL SETUP MENU – AIRPLANES
From the home screen, press and hold ENTER for 2 seconds to fi nd the MODEL SETUP menu for setting
of fundamental operating parameters as explained here.
MODEL SELECT
Memories are available to store parameters for up to 30 different models. With this selection highlighted
press ENTER. Press or to move the cursor up/down the screen to fi nd the desired memory to make
active, and press ENTER twice to confi rm the selection and automatically return to the home screen. Or
8
press ESC to return to the home screen.
Changing the model memory is not possible if the Tx battery voltage is too low. See the INPUT POWER
section on page 4. It’s a good idea to keep a record of all settings in each memory as a backup in case
parameters in a particular memory are accidentally changed, etc.
MODEL MANAGEMENT
Shows basic information regarding the model setup
in the “Model” memory number at top-left. Move the
cursor up or down to select / change the function to
adjust, and press ENTER to adjust the function.
Name: With the cursor on this line press ENTER.
The method for setting the model name is the same
as for entering the USER NAME as described on
page 7. The maximum number of characters is eleven. Press ESC when fi nished.
Model Type: Press
or to select the model type as airplane, helicopter, or quadcopter. Press ENTER to confi rm.
Model Copy: To copy all parameters from one model memory to another, place the cursor at this
line and press ENTER. The “COPY FROM” page will show. Highlight the memory to copy FROM and
press ENTER. Now the “COPY TO” page will show.
Place the cursor over the memory number to copy TO, and press ENTER. The “COPY CONFIRM”
screen will show. To abandon the copy function as shown on-screen, highlight “NO” and press ENTER
to return to the “COPY TO” screen. Press ESC to return to the “MODEL MANAGEMENT” screen.
Otherwise, press to highlight “YES” and press ENTER. All settings that previously existed in the
receiving memory will be permanently erased. The display will return to the COPY TO screen. Return
to the “MODEL SELECT” screen to confi rm the copy function was successful by looking at the memory
that was copied “to”.
Model Reset: Use this function to clear all parameters of any single memory except model type back
to factory defaults. Enter this screen, move the cursor over the memory to reset and press ENTER.
Select “NO” to cancel or “YES” to proceed with the reset, and press ENTER. The display will then
return to the “MODEL RESET” screen.
Wireless Transfer: To transfer all parameters
of one memory in this transmitter to another Tactic
TTX8 50 transmitter, move the c ursor to thi s line and
press ENTER. Press or to sel e ct “Send” or
“Receive”. Press ENTER, then or to select
the model number to send or receive data. Press
ENTER to perform the function, or ESC to cancel.
to place the cursor on this line, and ENTER to highlight the selection. Press
Model :OOName : Sensei SS1
Model Type : Airplane
Model Copy
Model Reset
Wireless Transfer
SendOOSensei SS1
Receive OOSensei SS1
Transferring .
Model Management
Wireless Transfer
WING TYPE
This is for setting the type of tail and wing confi guration for the model. Depending on the mixes used and
setup of the aircraft, it might be necessary to change the aileron, elevator, or rudder reversing settings to
achieve the proper throw directions for the model.
For best results, selecting certain tail or wing types might require some servos to be connected
to different outputs on the receiver (not the normal channel slots). The TTX850 will automatically
map all controls accordingly. See the servo connection charts in this section for details.
TAIL S E T TINGS
“Normal” is the factory default setting for the “TAIL” type. Move the cursor over “Normal”, press ENTER
then
selection. The charts below can aid in determining the preferred tail and fl ap setting for the model.
or to select from V-Tail, Delta (elevon), and 2 Elevator options. Press ENTER to confi rm the
9
Normal: One servo each is used for aileron(s), elevator(s), and rudder.
V-tail : Elevator and rudder channels are mixed. Two servos are used in the tail – one for each control
surface, with connections as shown in the graphic below. V-tail mixing controls the airplane’s “pitch”
and “yaw” axis at the same time. If the elevator and rudder functions appear reversed at the control
surfaces, it may be necessary to swap the channel 2 and channel 4 servo plug positions in the Rx. The
travel limits for each servo can be adjusted independently.
Delta wing (elevon): Elevator and aileron channels are mixed, useful for aircraft such as fl ying
wings and other models not having a tail. Elevon mixing controls the airplane’s “pitch” and “roll” axis at
the same time. One servo is used for each control surface. Travel limits for each servo can be adjusted
separately. If the elevator and aileron functions appear reversed at the control surfaces, it may be
necessary to swap the channel 1 and channel 2 servo plug positions at the Rx for the delta wing mix.
If the delta wing option is selected, and the “FLAP” option below is set to 2AI1FL, the elevator channel
will mix 100% to the aileron channel.
2-Elevators: Elevator channel 2 and another channel are mixed for aircraft which have two separate
servos moving separate elevator surfaces. Both elevators move independently, and are independently
adjustable for travel limits, etc. See the charts below for details.
FLAP SETTINGS
The “FLAP” setting allows for confi guration of the ailerons and/or fl aps of the airplane. Move the cursor over
“1AI” to select from the following options:
10
1AI : Use this “1 aileron”
setting for normal
wing types having
one aileron on each
wing connected with
a Y-harness or where
one servo controls the
movements of both
ailerons simultaneously.
1AI1FL: This “1 aileron
+ 1 fl ap” setting is for
wings having one
servo (or 2 servos
on a Y-harness) that
controls the ailerons on
both wings, and another
servo that controls the
flaps on both wings
(both servos moving
in the same direction).
Connect the aileron
servo to Rx channel 1,
and the fl ap servo to
channel 5 (not available for delta). See the CH5-CH8 Set section for switch assignments for fl aps.
1AI & Normal
CH 1Aileron
CH 2Elevator
CH 3Throttle
CH 4Rudder
CH 5Aux 1
CH 6Aux 2
CH 7Aux 3
CH 8Aux 4
1AI1FL & Normal
CH 1Aileron
CH 2Elevator
CH 3Throttle
CH 4Rudder
CH 5Flap
CH 6Aux 1
CH 7Aux 2
CH 8Aux 3
1AI & V-tail
CH 1Aileron
CH 2V- tail 1
CH 3Throttle
CH 4V- tail 2
CH 5Aux 1
CH 6Aux 2
CH 7Aux 3
CH 8Aux 4
1AI1FL & V-tail
CH 1Aileron
CH 2V- tail 1
CH 3Throttle
CH 4V- tail 2
CH 5Flap
CH 6Aux 1
CH 7Aux 2
CH 8Aux 3
1AI & 2 Elev
CH 1Aileron
CH 2Elevator 1
CH 3Throttle
CH 4Elevator 2
CH 5Aux 1
CH 6Rudder
CH 7Aux 2
CH 8Aux 3
1AI1FL & 2 Elev
CH 1Aileron
CH 2Elevator 1
CH 3Throttle
CH 4Elevator 2
CH 5Flap
CH 6Rudder
CH 7Aux 1
CH 8Aux 2
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