How to Modify a Spektrum DX6 Throttle

By William Pippin

Modifying a Spectrum DX6 transmitter's throttle settings requires navigating through several of the DX6's program settings. The DX6 has a 10-model memory for up to 10 different planes or helicopters. Switching between the models in system mode will be necessary to select the right model you want to adjust the throttle on. Once the proper model is selected, navigating to the function mode for the throttle's adjustment will be required. There is also a trim button next to the throttle stick on the transmitter. This trim only works when the throttle stick is below the 50 percent level, allowing idle control without effecting mid- and high-throttle positions.

Enter "System Mode" by pressing the "Scroll" and "Increase" buttons on the lower face of the transmitter upward simultaneously while turning on your transmitter.

Use the "Scroll" button to move through the System Mode's functions until you reach the screen entitled "MDL" for model selection. Press the "Increase-Decrease" button to select the model you want to adjust the throttle on, pushing the button up to increase the throttle and down to decrease the throttle.

Push "Scroll" and "Increase" simultaneously to exit "System Mode."

Enter function mode by pressing the "Scroll" and "Increase" buttons up simultaneously until a beep is heard. Move between the functions with the "Scroll" button. The functions pertaining to a servo controlled throttle are servo reverse, sub-trim and travel adjustment. Throttle control functions for helicopters with a cyclic collective pitch mechanism (CCPM) are throttle curve stunt (T_S), throttle curve normal (T_N) and throttle hold (HLD).

Adjust the servo reverse function by using the "Scroll" button to move through the functions until you see "REV-NORM." Push the "Channel" button until you see "THR." Use the "Increase-Decrease" button to change the servo's direction. The servo reverse setting is designed to change the servo's rotation direction in relation to the control stick's movement.

Adjust the "Sub-Trim" function by using the "Scroll" button to move through the functions until you see "SB-TRIM." Push the "Channel" button until you see "THR," and then adjust the values with the "Increase-Decrease" button. Use this "Sub-Trim" function to adjust the servo position electronically when it is difficult to get the right position mechanically.

Adjust the travel adjustment function by using the "Scroll" button to move through the functions until you see "TRV-ADJ." Push the "Channel" button until you see "THR." The factory setting is 100 percent, although this setting can be adjusted up to 150 percent.

Adjust the throttle controls on CCPM helicopters according to the manufacturer's recommended settings. Check your helicopter's documentation for the values of the throttle curves. There are three settings available on the DX6 for the throttle curve stunt function -- "TLS," "T2S" and "THS." "L" represents the throttle stick in the lower or down position, "2" represents the middle position and "H" represents the high position. The throttle curve normal function has two settings, "TLN" and "T2N," representing the low and middle stick settings.

Adjust the throttle curve normal function by using the "Scroll" button to move through the functions until you see "TLN." Press the "Channel" button to select the point of the throttle position you have selected ("L," "2" or "H"), and then press the "Increase-Decrease" button to adjust the selected values.

Press the "Scroll" button in function mode until you see "TLS" to enter the throttle curve stunt settings. Press the "Channel" button to select the point of the throttle position you have selected, "L" or "2." Press the "Increase-Decrease" button to adjust the value of the setting. The high stick "H" setting on throttle curve stunt is factory set to 100 percent and cannot be changed.

Adjust the throttle hold setting by using the "Scroll" button to move through the functions mode until you reach "HLD." The factory setting is "off". Use the "Increase-Decrease" button to adjust the setting's value.

Tip

The throttle hold button can be used to make the radio safe from unwanted inputs. In its factory preset position, which is "Off" with the hold switch "On," accidentally bumping the throttle stick does nothing. The throttle hold can be also be used to set up the helicopter for auto-rotation landings. Consult your helicopter documentation for the recommended settings.

About the Author

William Pippin is a resident of Las Vegas Nevada who has been in the electrical trade for over 20 years, the last 10 as a foreman running tracts, custom homes and commercial tenant improvements. Certified in Lutron Control Systems, Pippin also repairs Playstation 3 and XBox 360 consoles as a hobby.