79SPEKTRUM DX7 • HELICOPTER PROGRAMMING GUIDE
Function Mode Functions
Dual Rate and Exponential
The Dual Rate and Exponential function allows two control rates to be programmed and selected with a switch.
Dual rates and exponentials are available on the aileron, elevator and rudder channels. Changing the dual rate
value not only affects the maximum control authority but also affects the overall sensitivity of control. A higher
rate yields a higher overall sensitivity. The sensitivity around center can be tailored using the Exponential
function to precisely adjust control feel.
Dual rates can be controlled by their respective dual rate switches (aileron, elevator and rudder). An auto
dual rate function is available that allows to automatic selection of the desired rates via the three-position
flight-mode switch.
Exponential values are adjustable from -100% to +100%. The factory default settings for both the 0 and 1 switch
positions are 100%. Either switch position may be selected as the low or high rate by placing the switch in the
desired position and adjusting the value accordingly.
To Adjust the Dual Rate
Press the DowN and SELECT keys simultaneously to access the Function Mode.
In Function Mode, use the UP or DowN keys to select the D/R & EXP screen.
Press the INCREASE or DECREASE key to select the desired channel (AILE, ELEV or RUDD).
Press the SELECT key to highlight the D/R or EXPO function.
Adjust the dual rate values for the selected switch position using the INCREASE or DECREASE keys.
The Dual Rate and Expo functions for aileron, elevator and rudder can be combined on the flight mode auto
dual rate/expo conveniently allowing high or low rates to be selected via the flight mode switch. See Page 81
for more details.
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