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Switchable Servo Travel Progressive Servo Travel Coupled Exponential & Dual-Rate
(access via Set-Up Menu) (access via Set-Up Menu) (access via Set-Up Menu)
20 Fixed Wing Models
DUAL-RATE EXPONENTIAL EXPO-
/
DUAL-RATE
The Dual-Rate function lets you switch to a different
amount of travel while the model is in flight, using an
external switch. The travel for each of the two switch
positions can be set to any value within the range 0 to
125% of normal servo travel. The “D/R” switches must first
be connected to main circuit board in the transmitter (see
page 10). After selecting the “D/R” code the first step is to
select the channel (channel 2 to 4) using CH SEL :
Transmitter Ch. Function External Switch
2 Aileron socket 0
3 Elevator socket 1
4 Rudder socket 2
Move the switch to the appropriate position, then set
the required servo travel using INC and DEC .
Switch position in the display:
ch = closed (ON)
CH = open (OFF)
Never reduce the Dual-Rate value to 0, as this would
mean that the function would not move at all after you’ve
operated the switch.
Exponential travel reduces the servo travel around
the neutral position of the stick. Travel progressively
increases towards the stick end-points, so that full
servo travel is still available at the extremes. The
degree of progression can be set from linear “LN” (or
0%) to 100%. The Exponential function therefore has
no effect when set to “LN”. Dual-Rates and the
Exponential function are controlled by the same
switch, see EXPO-/DUAL-RATE
:
Transmitter Ch. Function External Switch
2 Aileron socket 0
3 Elevator socket 1
4 Rudder socket 2
Move the switch to the appropriate position, then set
the required servo travel using INC and DEC .
Switch position in the display:
ch = closed (ON)
CH = open (OFF)
The Dual-Rate function provides a means of adjusting
servo travel symmetrically around the neutral position to
any point between 0 and 125%, and switching between the
two settings by means of an external switch. The
Exponential function alters the servo response curve.
Since the external switches affecting control functions 2…4
control the Dual-Rate and Exponential functions
simultaneously, it is possible for you to set-up the controls
of your model very precisely, to suit your exact
requirement. The combination of Dual-Rates and
Exponential is particularly advantageous with very fast
models. For example, the memory can be programmed
with two independent values, separately for aileron,
elevator and rudder, such as a servo travel of 20% for one
external switch position and 125% for the other position,
with an exponential curve of, say, linear or 80%. Note that
this Exponential setting defines the “degree of progression”
(the shape of the curve), not the extent of the servo travel
itself. For safety reasons the lowest the Dual-Rate
value should be set to is 20% of normal travel.
Characteristic Curves for various settings.
Dual-Rate = Linear reduction or increase of
servo travel (0% to 125%)
Exponential = Progressive control characteristic
with 100% servo travel
Expo-/Dual-Rate = Combined Exponential and Dual-
Rate function
20


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