Manual Graupner MX-16 HoTT (page 128 of 200) (English)

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Program description: free mixers

Additional special features of free mixers

If you set up a mixer whose input is the same as its

output, e. g. “c1  c1”, exotic results can be obtained

in conjunction with the option of switching a free mixer

on and off. You will ﬁnd one typical example of this on

pages 172 … 174.

Before we come to setting mixer ratios, we have to

consider what happens if a mixer input is allowed to act

on the pre-set coupling of aileron servos, ﬂap servos or

collective pitch servos:

Fixed-wing models:•

Depending on the number of wing servos set in the

“Aileron / Flap” line of the “Base settings” menu, re-

ceiver outputs 2 and 5 are reserved for the aileron

servos, and outputs 6 and 7 for the two ﬂap servos,

as special mixers are assigned to these functions.

If mixer outputs are programmed to this type of cou-

pled function, you have to consider their effect on the

associated pair of wing ﬂaps, according to the “re-

ceiving” control channel:

Mixer Wirkung

NN *  2 Servo pair 2 + 5 responds with aileron

function

NN *  5 Servo pair 2 + 5 responds with ﬂap

function

NN *  6 Servo pair 6 + 7 responds with ﬂap

function

NN *  7 Servo pair 6 + 7 responds with aileron

function

Model helicopters:•

Depending on the type of helicopter, up to four ser-

vos may be employed for collective pitch control;

these will be connected to receiver outputs 1, 2, 3

and 5. The transmitter software links them together to

provide the functions collective pitch, roll and pitch-

axis.

It is not advisable to mix one of the transmitter con-

trols into these occupied channels using the free mix-

ers available outside the “Heli mixers” menu, as you

may inadvertently generate some extremely complex

and unwanted interactions. “Collective pitch trim via a

separate transmitter control” counts as one of the few

exceptions to this rule; see example 2 at page 131.

Important note:

When dealing with the interaction of multiple mixers

on one control channel, it is essential to remember

that the mixed travels of the individual mixers are

cumulative when multiple stick commands are made

simultaneously, and this brings a danger that the

servo concerned may strike its mechanical end-

stops. If you encounter this problem, simply reduce

the servo travel in the “Servo settings” menu, and /

or reduce the mixer values. However, if you do not

wish to reduce the travels in this way, because this

method would unnecessarily reduce the control

travels you normally use, then you may prefer an

alternative method of preventing the servos striking

their end-stops: set a suitable travel limit in the

“LIMIT -/+” lines of the “RX SERVO” display page of

the “Telemetry” menu.

Erasing mixers

If you need to erase a mixer that you have already

deﬁned, use the arrow buttons  of the left or right-

hand touch-key to select its line, then use the arrow but-

tons  to move to the “from” column before touching

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

ﬁeld in the “from” column of the mixer to be erased is

now highlighted: simultaneously touch the two arrow but-

tons  or  of the right-hand touch-key (CLEAR).

Mixer switches

In our example above, a physical switch “2” and the

control switch “C1” have been assigned to the two linear

mixers 1 and 2, and switch “3” to mixer 3.

The switch symbol to the right of the switch number

shows the current status of that switch.

Any mixer to which no switch has been assigned in

the column marked by the switch symbol

at the

bottom of the screen is permanently switched on.

“Type” (including the trim)

If you wish, and if you are using one of the primary

control functions 1 … 4, you can set the trim value of

the digital trim lever for the associated stick to affect the

mixer input. This is accomplished by touching the central

SET button of the right-hand touch-key, then using its

arrow buttons to select “Tr” in the highlighted ﬁeld.

Note:

The effect of the Ch 1 trim lever on the mixer output var-

ies according to the function which has been assigned

to it in the “Base settings” menu (pages 74 and 82) in

the “Motor at Ch 1” column for ﬁxed-wing models.

* NN = Nomen Nominandum (name to be stated)

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