SPEKTRUM DX7 • HELICOPTER PROGRAMMING GUIDE SPEKTRUM 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 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 key 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 key.
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 86
for more details.
Dual Rate and Exponential (continued)
The Exponential function allows two exponential rates to be programmed and selected with a switch. Exponential
is available on the aileron, elevator and rudder channels. Changing the exponential value does not affect the
maximum control authority but only affects control sensitivity. Exponential is normally used to reduce control
sensitivity around neutral while still allowing high control authority at the extremes of throw. The sensitivity
around center can be tailored using the Exponential function to precisely adjust control feel.
Exponential rates can be controlled by their respective rate switches (aileron, elevator and rudder), or combined
on a flight mode switch. Exponential is available for the aileron, elevator and rudder channels. Expo values are
adjustable from -100% (full negative expo), LIN (linear), and +100% (full positive expo). The factory default
settings for both the 0 and 1 switch positions are LIN or 0%. Either switch position may be selected to give any
desirable EXPO rate by placing the switch in the desired position and adjusting the value accordingly.
Note: A negative (-) Expo value will increase sensitivity around neutral, and a positive (+) Expo
value will decrease sensitivity around neutral. Normally a positive value is used to desensitize
control response around neutral.
To Adjust the Exponential
Press the DowN and SELECT keys simultaneously to access the Function Mode.
In Function Mode, use the UP or DowN key to select the DUAL RATE AND EXPONENTIAL screen.
Press the INCREASE or DECREASE key to select the desired channel (AILE, ELEV or RUDD).
Move the selected channel’s dual rate switch to the desired position, 0 or 1.
Press the SELECT key until EXP is highlighted.
Adjust the Expo rate values for the selected switch position using the INCREASE or DECREASE key.
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