TQ Radio System Adjustment
Article #542541

TQ Radio System Adjustment

The TQ radio system installed in your RTR model was pre-adjusted before it left the factory; however, the adjustment should be checked prior to running the model. These instructions are for Traxxas radio systems only.  

1) Before you ever turn your radio system on, you must "clear" your frequency. Clearing your frequency means checking to be sure that no one else in the area is operating on the same channel as you. There are six different channels numbered 1 through 6. Each of the six channels is represented by a color. Look at the crystal on the back of the transmitter to determine which of the channels your model is operating on.

2) TIP: Always turn the transmitter on first and off last. This will prevent the model from receiving stray signals and running out of control. Slide the transmitter switch to the "on" position. A steady red light should illuminate. A flashing red light indicates weak batteries. Weak batteries will limit the range of the radio signal between your transmitter and receiver. Loss of the radio signal can cause you to lose control of the model.

3) Turn the model on by either plugging the NiCad battery pack into the speed control or turning the on/off switch into the "on" position. The servos should jump and move to their idle (neutral) positions. Note: Traxxas models with mechanical speed controls do not use an on/off switch. Plugging the battery in turns the system on, unplugging the battery turns it off. CAUTION: When NiCad batteries begin to lose their charge, they will fade much faster than alkaline dry cells. Stop immediately at the first sign of weak batteries. Never turn the transmitter off when the battery pack is plugged in. The model could run out of control.

4) Operate the steering control on the transmitter (channel 1). Check for rapid operation of the steering servo and that none of the steering mechanism is loose or binding. If the servo operates slowly, check for weak batteries. Turn the "steering trim" control on the transmitter to adjust the servo so that the front wheels are pointing straight ahead. Check to be sure that the wheels do not turn more in one direction than in the other. If you cannot align the front wheels, you will have to re-center your steering servo (see "centering your servos").

5) Operate the throttle trigger to ensure that you have full forward and reverse operation of the throttle servo. If you have an electric-powered model and the motor started running when you plugged in the battery pack, then slowly adjust the throttle trim on the transmitter until the motor stops running.

6) The radio system should be range-tested before each seson of running. With the radio system on, have a friend carry the model away from you a distance equal to the maximum range you plan to operate the model. Make sure your friend avoids contact with the wheels while holding the model. At distance, once again test for complete radio control. Never attempt to run the model if the radio appears to be malfunctioning in any way. The model could run out of control.



The throttle neutral adjustment is located on the transmitter face and controls the amount of desired forward and reverse travel of the throttle trigger. There are two settings. 50/50 gives you the same amount of throttle travel in both forward and reverse. 70/30 gives you more travel for throttle and less for reverse. Change the adjustment by pressing the button and sliding it to the desired position. The drawings below show how the settings are arranged. Always use the 50/50 setting when using a mechanical speed control or forward/reverse electronic speed control. Use the 70/30 setting with a forward/brake electronic speed control or Traxxas nitro-powered models. This setting provides more proportional control over your forward speed. If you change this adjustment, your transmitter throttle trim will have to be reset. In some cases, the throttle servo may have to be re-centered with the throttle trim adjustment reset at "zero" (see "centering your servos").



On the front of the transmitter there are two switches, labeled channel 1 and channel 2. Moving the switches reverses the direction of the servo. Channel 1 controls the steering servo. Channel 2 controls the throttle servo. For example, if you turn your steering wheel right and the model moves left, then switch the steering servo (channel 1) reversing switch to correct the servo direction. The corresponding trim knob on the transmitter may need readjustment after reversing the direction of the servo.



Find the center neutral position of the steering and throttle servos. If other manufacturer\'s radio system components are going to be combined with the Traxxas radio system, pay careful attention to the wiring sequence. The Traxxas radio system is directly compatible with Futaba systems. The red wire coming from the battery pack or Traxxas speed control is positive, the black wire is negative. The white wire is the control signal. On some Airtronics/Sanwa and Novak systems, the positive and negative outputs are reversed from the Traxxas sequence. Refer to their instructions to determine which wires are positive and negative so that they can be connected properly to the Traxxas receiver. Failure to do so will cause severe damage to your receiver. With the radio components out of the model, connect the steering servo to "channel 1" on the receiver. Connect the throttle servo to "channel 2." Place fresh "AA" batteries in the transmitter and turn the power switch on. Turn the throttle and steering trim adjustments on the transmitter to the center "0" position. Plug reshly-charged battery pack into the speed control. If you have a nitro-powered model, place 4 fresh "AA" batteries into the receiver battery pack and turn the switch to the "on" position. The servos will jump to their center position. Now, unplug the battery pack (turn off the power to the receiver) and turn off the transmitter. Install the servo horn, servo saver, or mechanical speed control onto the servos being careful not to move the servo shafts.



For radio systems using a mechanical speed control, connect the red and black wires, which come from the speed control, to the "battery" terminal on the receiver. Power for the radio system comes from the main battery pack when it is plugged into the mechanical speed control. When the main battery becomes weak and loses its charge, the voltage available for the radio system will also decrease. When the voltage becomes too low, the servos will stop working and the model will continue out of control with the last command it had from the transmitter. This is not a defect in the radio system. The servos simply do not have enough power to return to center. Stop operation of the model at the first sign of sluggish performance and slow servos.



The XL-1 offers smooth digital-proportional control over your forward and reverse speeds. It also allows full control of the model when the main battery voltage is extremely low. Power for the radio system comes from the electronic speed control when it is connected to the main battery. The on/off switch on the speed control turns the entire radio system in the model on or off. The XL-1 has a B.E.C. (Battery Eliminator Circuit) and does not need a separate 4-cell battery pack. There is no need to connect anything to the "BATT" (battery) terminal on the receiver. The wiring diagram below shows typical wiring connections.The XL-1 has two adjustments; the neutral control and the proportional control. Use a small screwdriver to adjust the controls.

CAUTION: The adjustment controls will only turn 1/4 turn left or right from center. Do not turn the controls past their stops or they will break. Use a light touch when making adjustments. Controls damaged by overturning them past their stops will not be covered under the warranty.Adjusting the neutral control First, set the model on its stand, turn on the transmitter, and plug a fresh battery pack into the speed control. Set the throttle trim on the transmitter to the "0" mark. If the motor is running, gently turn the neutral control right or left until the motor stops runnin ad the L.E.D. is off (neither green or red).

Adjusting the proportional control: After setting the neutral control, move the throttle trigger on the transmitter to full throttle. Now, carefully adjust the proportional control right or left until the motor is running at its fastest speed and there is a strong green light emitted from the L.E.D. If the L.E.D. glows red instead of green, then switch the throttle servo reversing switch on the face of the transmitter.



Nitro-powered models use a 4-cell battery pack to power the receiver. The battery pack uses 4 "AA" batteries and plugs into the "BATT" terminal in the receiver. The steering servo plugs into "channel 1" and the throttle servo plugs into the "channel 2" terminal. The wiring diagram below shows typical wiring connections for a nitro-powered model.