Bedienungsanleitung Graupner MX-16 HoTT (Seite 130 von 200) (Englisch)

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Program description: free mixers

MIX1 6 el

trv

0%offs

SELSTO

The dotted vertical line indicates the position of the

mixer neutral point (“offset”), i. e. that point along the

control travel at which the mixer has NO inﬂuence on the

channel connected to its output. By default this point is

set to the centre position.

However, in our example the neutral (retracted) position

of the ﬂaps is located at the left-hand end-stop of the

rotary proportional control, and in this position the eleva-

tor must not be affected. We therefore have to shift the

mixer neutral point exactly to that position. If you have

not already done so, turn the control - in our example

this is CTRL 7 - to the left-hand end-stop and touch the

central SET button of the right-hand touch-key. The dot-

ted vertical line now moves to this point - the new mixer

neutral point - which always retains the “OUTPUT” value

of zero in accordance with the mixer deﬁnition.

As it happens, this setting is difﬁcult to show in a

screen shot, so we will change the “offset” value to

only -75%.

MIX1 6 el

trv

–75%offs

SELSTO

Notes:

If you wish, you can move the offset value back to •

centre or otherwise adjust it as follows: select SEL

using the arrow button  of the left or right-hand

touch-key, followed by brieﬂy pressing the central

SET button of the right-hand touch-key; you can now

use the arrow buttons of the left or right-hand touch-

key to move the offset value.

You can also return the mixer neutral point to cen-•

tre automatically as follows: select SEL using the ar-

row button  of the left or right-hand touch-key, then

simultaneously press the two arrow buttons  or

 of the right-hand touch-key (CLEAR).

Symmetrical mixer ratios

The next step is to deﬁne the mixer values above and

below the mixer neutral point, starting from its current

position. Use the arrow button  of the left or right-hand

touch-key to move to the “Travel” line: if necessary, use

the arrow buttons  of the left or right-hand touch-

key to select the SYM ﬁeld, so that you can set the

mixer value symmetrically relative to the offset point you

have just programmed. Touch the central SET button

of the right-hand touch-key, then set the values in the

two highlighted ﬁelds within the range -150% to +150%

using the arrow buttons of the right-hand touch-key.

Remember that the set mixer value always refers to

the input signal from the associated transmitter control

(control signal)! Setting a negative mixer value reverses

the direction of the mixer.

Simultaneously pressing the two arrow buttons  or

 of the right-hand touch-key (CLEAR) erases the

mixer ratio in the highlighted ﬁeld.

The “optimum” value for our purposes will inevitably

need to be established through a ﬂight testing pro-

gramme.

MIX1 6 el

trv

+20%

–75%offs

ASYSYM

Since we previously set the mixer neutral point to -75%

of control travel, the elevator (“el”) will already exhibit a

(slight) “down-elevator effect” at the neutral point of the

landing ﬂaps, and this, of course, is not wanted. To cor-

rect this we shift the mixer neutral point back to -100%

of control travel, as described earlier.

MIX1 6 el

trv

+20%

–100%offs

SEL

S TO

If you were now to reset the offset from -75% to, say, 0%

control travel, by selecting the SEL ﬁeld using the arrow

buttons  of the left or right-hand touch-key, and then

brieﬂy pressing the two arrow buttons  or  of

the right-hand touch-key (CLEAR) simultaneously, the

screen would look like this:

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Graupner MX-16 HoTT Seite 130

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