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SPEKTRUM DX18 • TRANSMITTER INSTRUCTION MANUAL
EN
D/R & Exponential
Dual Rates and exponentials is available on the aileron, elevator 
and rudder channels.  
To adjust the Dual Rate and Exponential:
1. Scroll to the channel and press the scroll wheel once. Scroll 
left or right to select the channel you wish to change and 
press the scroll wheel again to save the selection.
2. Scroll to dual rate and press the scroll wheel. Scroll left or 
right to change the value and press the scroll wheel again to 
save the selection.
Exponential affects control response sensitivity around center but 
has no affect on overall travel. Positive exponential decreases 
the sensitivity around the center of gimbal movement.
Differential (Air and Sail Types only)
The Differential screen enables you to increase or decrease the 
amount of differential between aileron control surface throws. 
Positive Differential values decrease the amount of “up” travel 
without affecting the “down” travel on the opposite control 
surface.
Negative Differential values decrease the amount of “down” 
travel without affecting the amount of “up” travel on the opposite 
control surface.
The Differential menu option only appears when a multi-servo 
aileron wing type is active in Aircraft Type.
To adjust the Differential:
1. Scroll to Switch and press the scroll wheel. Scroll right to 
select On (Differential is always on) or assign the differential 
to a switch position.
2. Press the scroll wheel a second time to save the selection.
3. Scroll to Diff: and press the scroll wheel once to change the 
value.
4. Press the scroll wheel again to save the selection.
Absolute (Abs.) Travel
The Abs. Travel function limits the amount of travel on a chan-
nel. Adjust the Abs. Travel value to prevent a throttle servo or 
helicopter cyclic servo from binding when a mix is applied.
Balance
Balance is available on all channels to fi ne-tune the servo 
position at up to 7 points. This is a precision curve mix that is 
normally used to prevent binding when multiple servos are used 
on a single control surface.
You can also use the Balance menu option to match throttle 
response on twin engine aircraft or level the swashplate on a 
helicopter.