Manual Robbe Futaba FX-40 (page 60 of 105) (English)

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Model menu

Programmable mixers

FX-40

17.3 PROGRAMMABLE MIXERS

The FX-40 features ten fr

eely programmable mixers which are

available for every model memory, in addition to the fixed pre-

programmed mixer functions. The programmable mixers fea-

ture pre-set transmitter control settings which can be called

up, ranging from a linear characteristic to a maximum nine-

point curve; the latter can be expanded to seventeen points

for special purposes.

The primary use of these mixers is to compensate for interac-

tions between the individual functions of fixed-wing model air-

craft, e.g. for precision aerobatic flying. When the corrective

mixers are properly set up, the model becomes generally sim-

pler and more pleasant to fly. The mixers can be set up to link

any functions and channels (Master and Slave channels).

Six curve types are available for the transmitter control confi-

guration: one linear, two exponential, one VTR, one line and

one curve. All these mixers can be assigned a separately vari-

able delay, to avoid abrupt transitions when a mixer is swit-

ched on in flight. Another option is to set group mode (effec-

tive in all flight modes) or individual mode (effective only in a

specific flight mode).

The trim select function determines whether the trim of the

Master channel is also to affect the Slave channel. The Offset

option allows you to adjust the mixed (slave) channel to match

the main function, so that there is no control surface move-

ment at the neutral position. The switches or other transmitter

controls which are used to activate the various mixers can be

selected individually. Finally, it is even possible to define a

transmitter control which is used to fine-tune the linked set-

tings.

Mark the ‘Prog. Mixer’ option in the Model menu. The screen

now typically looks like this:

In each case the individual mixers are listed in a line. The pro-

gramming procedure is described here using the first mixer as

an example; mixers 2 to 9 are set up in exactly the same way.

This menu is used to enter your preferred settings for the mixer

in question. In the last column you can define whether the

mixer is only to apply to one flight mode (Sepa) or to all flight

modes globally (Glob); global mode is the default setting. To

change this setting, mark the field for the mixer you wish to

program. The display changes, and a security query appears

which must be answered with ‘Yes’. The change takes effect at

that point.

In the centre column (Mode) you can determine the mixer

mode using exactly the same procedure. Two modes are avai-

lable: a normal mixer with Master and Slave channels is the

first option, but an alternative ‘Offset’ mixer can also be selec-

ted. In this case no Master channel is required, as it is used, for

example, to mix a fixed value into a particular function when a

switch is operated. The two mixer types are distinguished by

appropriate symbols, as shown in the previous screen shot.

You move to the actual programming masks by marking the

appropriate field in the ‘Mixer’ column on the left. The display

changes, and the first mixer programming menu appears.

The programming procedure involves the following steps:

• Activating the mixer

Mark the left field (‘INA’) in the first line; the default is ‘INA’

(inactive). Marking the field activates the mixer, and ‘ON’

appears.

• Defining the mixer switch

Mark the centre button field in the first line, and the switch

select menu is superimposed. You can now use the familiar

procedure to select the switch you wish to use, and the

direction of switch operation. If you want the mixer to be

switched on constantly, retain the default ‘NONE’ setting.

The selected switch is shown in graphic form on the screen.

• Setting the servo transit speed and delay

Mark the right ‘SPEED’ field in the first line, and a sub-menu

for setting the servo transit speed and delay appears, sepa-

rately for both directions of travel, i.e. ‘there’ and ‘back’.

In this menu you can program the speed for both the ‘there’

direction and the ‘back’ direction. Mark one of the ‘Speed’

fields, and a pair of ‘Arrow’ buttons and one ‘Reset’ button

appear at the right margin. The adjustment range is 0 to 27

increments. Please note: the higher the number, the more

slowly the servo moves. The maximum value (27 incre-

ments) corresponds to a duration of nine seconds. The

value is changed using the arrow buttons. Pressing the

‘Reset’ button restores the default setting.

The delay times can be entered directly as time values in

the range 0.0 to 4.0 seconds, with an increment of 0.1

seconds. This value means the time which elapses between

operating the switch (in the ‘there’ direction), and the mixer

taking full effect. In the ‘Back’ field you can program a delay

which occurs when the mixer is switched off again. The

default setting is ‘0’. Pressing the ‘Reset’ field restores the

default setting.

Normal-mixing

Offset -mixing

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Robbe Futaba FX-40 Manual

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