Manual Robbe Futaba FX-40 (page 28 of 105) (English)

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Curve set-up

FX-40

EXP1 = 3-POINT CURVE (EXPONENTIAL)

The “EXP1” function is used to alter the characteristic curve of the transmitter

control into a non-linear (exponential) curve, symmetrical ar

ound the centre point.

The exponential curve can be applied in either direction.

• Positive pr

efix: strong control response around the neutral position, reducing

towards the end-points.

• Negative prefix: w

eak control response around the neutral position, increasing

towards the end-points.

To change the degree of exponential simply press the button field “EXP A” or “EXP

B” and enter the appropriate value.

For a simple symmetrical setting activate the “Separate.” button field and select

“Combine.”.

The end-points are altered using “Rate A / B”.

OFFSET

The Of

fset setting changes the neutral position of the transmitter control relative to

the servo centr

e point. If the offset value is up to 50%, the travel remains the same

for both sides of neutral, but if the value is any higher, the servo travel will be at its

end-point at one extreme, so the travel becomes increasingly asymmetrical.

EXP2 = 2-POINT CURVE (EXPONENTIAL)

The “EXP2” function is used to alter the characteristic curve of the transmitter

control in a non-linear manner between the two end-points.

The exponential curve can be applied in either dir

ection.

•

Positive pr

efix: upward curve.

• Negative prefix: downward curve.

Press the button field “EXP” and set the value.

For a simple symmetrical setting activate the “ Separate.” button field and select “

Combine.”.

The end-points ar

e altered using “Rate A / B”.

OFFSET

The Offset setting changes the neutral position of the transmitter control relative

to the servo centr

e point. If the of

fset value is up to 50%, the travel remains the

same for both sides of neutral, but if the value is any higher, the servo travel will be

at its end-point at one extreme, so the travel becomes increasingly asymmetrical.

VTR = 5-POINT CURVE (VARIABLE TRI-RATE)

The VTR curve is a variable 5-point curve which divides the transmitter control

characteristic curve into two gradients, symmetrically around the zer

o point. In

principle this equates to linear travel reduction (Dual Rate), but in this case the

servo still reaches maximum travel at the end of the transmitter control travel.

Setting:

• First set the transmitter control reduction using P

.RA

TE A / P.RATE B, for exam-

ple 50% = 40% of travel.

• Now define the “elbow” point using P.POS A / P.POS B; around 85% is a good

starting point.

• If necessary adjust the end-points using Rate A / Rate B.

For a simple symmetrical setting activate the “ Separate.” button field and select “

Combine.”.

OFFSET

The Offset setting changes the neutral position of the transmitter contr

ol r

elative

to the servo centre point. If the offset value is up to 50%, the travel remains the

same for both sides of neutral, but if the value is any higher, the servo travel will be

at its end-point at one extreme, so the travel becomes increasingly asymmetrical.

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Robbe Futaba FX-40 Manual

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