TTX850 TM 2.4GHz 8-CHANNEL COMPUTER RADIO INSTRUCTION MANUAL 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.
TABLE OF CONTENTS SLT TECHNOLOGY, Tx-R, AND COMPATIBLE RECEIVERS . . . . . . . . . . . . . 3 RECEIVER INSTALLATION . . . . . . . . . . . . . . . . 3 TTX850 POWER SYSTEM . . . . . . . . . . . . . . . . . 4 Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Charge Jack and Charging Rechargeable Batteries . . . . . . . . . . . . . 4 Power LED . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 FLIGHT CONTROLS . . . . . . . . . . . . . . . . . . . . . . 4 Gimbal Sticks. . . . . . . . . . . .
Carrying Handle LED Power Indicator Toggle Switches Neck Strap Eyelet Trim Levers Side Lever Power Switch Charge Jack Accessory Port LCD Pushbuttons Firmware Upgrade Jack Battery Connector Socket SLT TECHNOLOGY, Tx-R, AND COMPATIBLE RECEIVERS SLT technology ensures that transmitters emit a strong, clear, frequency-hopping 2.4GHz signal, and that your compatible receiver accepts no signal except yours.
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 flat 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.
receiver (mixes, exponential, etc.). Some electronic functions can be turned on/off by the pilot during flight 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.
STICK TENSION: Silver screws on the back of each gimbal are used to adjust the stick tension. Turn the screw clockwise to make stick tension more firm. Turn the screw counter-clockwise to make stick tension more light. Right stick, up/down tension adjustment Right stick, sideways tension adjustment THROTTLE RATCHET: A silver ratchet bar is mounted across the throttle gimbal. For smooth throttle feel for helicopter use, you may wish to remove this bar.
LCD, HOME PROGRAMMING SCREEN 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.
USER NAME Enter your name to identify the radio. The cursor will be under the first character. Press ENTER to highlight this character. Press and to find the desired character, then ENTER to confirm. 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 finished.
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 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.
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.
2AI & Normal 2AI & V-tail 2AI & Delta 2AI & 2 Elev CH 1 Aileron 1 CH 1 Aileron 1 CH 1 Ailevator 1 CH 1 Aileron 1 CH 2 Elevator CH 2 V- tail 1 CH 2 Ailevator 2 CH 2 Elevator 1 CH 3 Throttle CH 3 Aileron 2 CH 3 Throttle CH 3 Aileron 2 CH 4 Aileron 2 CH 4 V- tail 2 CH 4 Rudder CH 4 Elevator 2 CH 5 Aux 1 CH 5 Throttle CH 5 Aux 1 CH 5 Throttle CH 6 Rudder CH 6 Aux 1 CH 6 Aux 2 CH 6 Rudder CH 7 Aux 2 CH 7 Aux 2 CH 7 Aux 3 CH 7 Aux 1 CH 8 Aux 3 CH 8 Au
WARNINGS Warnings can be set to alert you of undesireable switch or throttle positions when the radio power switch is first turned on. For example, if the throttle is at full when the radio is turned on you would see and hear an alarm. The alarms shown can be set to “ACT” (active) or “INH” (inhibit). Thro Pos: The throttle position warning sounds when the throttle stick is over 25%. Clear the alarm by moving the stick down.
Sub-trim: Finely adjusts a channel’s center position. Be aware that extreme adjustments of sub-trim could possibly result in servo binding if the servo’s output arm moves too far in the model. This is available for all channels. DUAL-RATES, EXPONENTIAL For setting dual-rates and/or exponential travel for the aileron, elevator, and rudder channels. Dual-rates allows a channel’s maximum travel limits to be switched between two limits.
The display will show a graphic representing the switch, and the different control positions of the switch as shown here (0, 1, and 2 if applicable). The default position for “0” will always be in the up direction. The control positions of the switch can be assigned to fit personal preference. To use the default settings, simply press ESC to confirm. To change the control locations of the switch to be high “H”, medium “M”, or low “L” position, press or to move the cursor to the position to be changed.
Repeat these steps to set additional points on the graph as desired. A point for “H” is not marked on the graph, but is the right-most end of the curve line. The vertical position of this point can be adjusted by moving the cursor to the RATE percentage, pressing ENTER, then or buttons. Press ENTER when finished. To clear any point on the graph, place the cursor on the RATE percent, move the throttle stick until the graph’s vertical line intersects the point, press ENTER and then CLEAR.
AILERON MIXER The aileron channel can be mixed to the rudder channel, which can be useful with certain wing/airplane types. To make this AILE RUDD mix active at all times do NOT assign a switch at the CTRL line. Adjust the mixture percentage and press ENTER. On/off control of this mix can be assigned to a switch. Set the mix rates as desired for each switch position. Press ESC when finished.
2AI1FL: If this wing type was set, the flap channel can be mixed with the aileron, elevator, or back to the flap. Set the mix percent for each channel to be mixed, for all switch positions that control the mix. Do NOT assign a switch at the CTRL line to make the mix active at all times. Press ENTER when done. AIR BRAKE SET This function will allow you to define the air brake position and activate it with a switch. It’s available only when 1AI1FL or 2AI1FL wing types are chosen.
To count UP as a stopwatch, leave the timer set to 00:00. To configure the timer to count DOWN, set a time other than 00:00 with a maximum possible start time of 99:59. When used as a countdown timer, a set of tones will sound at 00:10 and every second thereafter to warn that the timer is nearing the end. After reaching 00:00, the timer will automatically begin counting up to help track how much longer the model was operational after the timer ended.
MODEL SETUP MENU – HELICOPTERS This menu is for setting control functions for use with helicopters. See the MODEL SETUP MENU – AIRPLANES section for functional descriptions of most menus. A swashplate type selection function is included for helicopters. With the model type set to helicopters, press ENTER for 2 seconds to access this menu from the home screen. All channels for helicopters are assigned as shown in the chart on page 6.
Position 1 = normal: Used for startup, take-off, landing, and typical flight profiles. Position 2 = idle-up 1: Used for aerobatic flight Position 3 = idle-up 2: Typically used as a secondary setup for aerobatic flight. Make sure all mechanical linkages are connected exactly as specified in the helicopter’s instruction manual. Make sure the model’s full throttle position can be achieved when the throttle stick is at maximum deflection.
SWASHPLATE MIXER This mix is not available when using the “1 Servo” swash setting. This function adjusts the mixture rate of the pitch, aileron, and elevator channels for the swash plate. Move the cursor to the value to adjust, and change as necessary. CYCLIC MIXER This function can automatically deflect the roll/pitch servos to negate unwanted loss of lift when throttle level is adjusted. The aileron and/or elevator channels can be mixed to the throttle channel.
all channels can be set to move to a specific position – or only throttle channel 3 can be custom set (with all other channels holding). If using the Tactic TR825 receiver, beware that ALL channels can be set to specific positions. Be alert to the position of all channels. The factory default failsafe position for channel 3 is to move to 0% throttle. Refer to the instructions with the receiver or see www.tacticrc.com/receivers for details. 1.
6. The TTX850’s “searching” screen should disappear. The teacher can release the trainer switch. If the TTX850 doesn’t identify the signal from the student’s radio a “NO SIGNAL” message will show. 7. Once linked, move the throttle stick on both transmitters to minimum. Turn the Rx power on and make sure only those channels selected for transfer to the student are transferred when the TTX850 trainer switch is deflected.
WIRED TRAINER The TTX850 can be connected by cable to most R/C transmitters which also have a trainer / DSC jack for training purposes. See the ACCESSORIES section for details about optional trainer cords. Select the proper cord for Tactic and the other radio to be used for training purposes. 1. Link the teacher’s radio to the Rx and move the throttle stick to minimum position. 2.
WARNING INDICATIONS The following indications will sound and/or show if any of the following occur: LOW BATTERY: Battery voltage is at or below the BATT. ALARM setting. Cannot change memories at this time. Replace or re-charge batteries. RF ON / OFF?: Turn the radio’s Rf signal on or off. THRO POS.: The throttle stick is >25% full deflection at start-up. Move the throttle stick to minimum. THRO CUT: The throttle cut function has been set and the switch is on. Turn the switch off.
7. Perform a range check as explained on page 24. 8. Anytime power is to be removed from the radio system, it’s important to shut down power in the aircraft first. Otherwise, the aircraft could become out of control and cause a safety hazard! Move the throttle stick and throttle trim to minimum position to stop the glow engine or shut down the ESC. Once the propeller has stopped rotating, shut off the ON/OFF power switch in the model, and disconnect the power battery from the ESC in electric airplanes.
● Do not allow chemicals to come in contact with any parts of the radio system. Substances such as glow fuel, gasoline, CA glue, etc. could permanently damage plastic parts of the radio system. ● If rechargeable batteries were installed in the transmitter, remove the batteries before placing the radio in long-term storage.
FAILSAFE NOT WORKING CORRECTLY: Receiver is not properly linked to the transmitter – link the Rx to the Tx and re-try. Check the channels which are programmed for transferring from Tx to Rx in the transmitter’s programming. Contact Hobby Services for further details. WIRELESS TRAINING FUNCTION NOT LINKING: Check to see that another Tactic 2.4GHz system is not on in your area.
DTXP4704 DTXP4708 TACM1000 TACM1005 TACM1010 TACM1011 TACM1100 TACP0100 TACP0101 Onyx “AA” Alkaline Battery (4) Onyx “AA” Alkaline Battery (8) Tactic to Tactic Trainer Cord Tactic to Spektrum® JR® Tactic to Futaba® Round Tactic to Futaba Square 4.8V 1000mAh NiMH TTX850 TC100 AC Global Charger Tx Rx Charge Leads Tactic See www.tacticrc.com for a full list of radio parts and accessories. FCC STATEMENT This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions.
CE COMPLIANCE INFORMATION FOR THE EUROPEAN UNION Instructions for Disposal of Waste Equipment by Private Users in the European Union: This symbol on the product or its packaging indicates this product must not be disposed of with other household waste. Instead, it is the user’s responsibility to dispose of their waste equipment by handing it over to a designated collection point for the recycling of waste electrical and electronic equipment.
In the European Union, send it postpaid and insured to: Service Abteilung Revell GmbH Henschelstrasse 20-30 32257 Bünde Germany Tel: 01805-110111 (nur für Deutschland) E-mail: Hobbico-Service@Revell.de Tacticrc.com Tx-Ready.com Distributed in the EU by Revell GmbH, Bünde Germany ● This product is suitable only for people of 14 years and older. This is not a toy! ● WARNING: CHOKING HAZARD - May contain small parts. Keep away from children under 3 years. Please retain packaging for future reference.
© 2014 Tactic, a Hobbico company Made in China TACJ2850 v1.
