GRAUPNER mx-12 Hott Programming Manual Download Page 126

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126

Program description: free mixers

General notes regarding freely programmable mixers

The two menus “

Fixed-wing mixers

” and “

Helicopter

mixers

”, as described on the preceding pages, contain

a wide range of ready-programmed coupling func-
tions. The basic meaning of mixers has already been
explained on page 108, together with the principle on
which they work. In the following section you will find
information relating to “free mixers”:
In addition to the pre-programmed mixers mentioned
above, the

mx-16

HoTT offers three freely program-

mable linear mixers which can be used in every model
memory; their inputs and outputs can be selected to suit
your exact requirements.
Any

control function

(1 to 8), or what is known as a

“switch channel” (see below), can be assigned as the

input signal

of a “free mixer”. The signal present at the

control channel, and passed to the mixer input, is deter-
mined by the transmitter control

and

any control charac-

teristics as defined, for example, in the “

D/R Expo

” and

“

Transmitter control settings

” menus.

The mixer output acts upon a

freely selectable control

channel

(1 to max. 8 - depending on receiver type).

Before the signal is passed to the associated servo, the
only influences which can act upon it are those defined
in the “

Servo settings

” menu, i. e. the servo reverse,

centre and travel functions.
One

control function

can be set up to affect several

mixer inputs simultaneously, if, for example, you wish to
arrange several mixers to operate in parallel.
Conversely it is possible for several mixer outputs to
affect one and the same

control channel

The following description of the free mixers includes
examples of such arrangements.
In software terms the default setting for any “free mixer”
is that it is constantly switched on, but it is also possible

to assign an optional ON / OFF switch to it. However,
since there are so many functions to which switches can
potentially be assigned, you should take care not to as-
sign dual functions to particular switches accidentally.

The two important mixer parameters are as follows:

… the

•

mixer ratio

, which defines the extent to which

the input signal acts on the output of the control
channel which is programmed as the mixer output.
… the

•

neutral point

, which is also termed the

“offset”. The offset is that point on the travel of a
transmitter control (stick, rotary proportional knob
CTRL 6 … 8 and SW 1 … 9) at which the mixer has
no influence on the control channel connected to its
output. Normally this is the centre point of the trans-
mitter control, but the offset can be placed at any
point on the control’s travel.

Switch channel “S” as mixer input

In some cases a constant control signal is all that is
required as the mixer output; a typical application would
be for slight up-elevator trim when an aero-tow coupling
is closed - completely independently of the normal
elevator trim.
If you then assign a switch, you can switch to and fro
between the two mixer end-points, and adjust the sup-
plementary elevator trim deflection by altering the mixer
ratio.
To identify this special arrangement, this mixer input
control function is designated “S” for “switch channel”
in the software. If you do not want the “target channel”
to be affected by the “normal” transmitter control, the
control can be de-coupled from the function input of
the associated control channel by entering “free” in the
“

Transmitter control settings

” menu; see pages 94

and 96. The following menu description again includes
an example which makes this function clear.
Now use the arrow buttons of the left or right-hand
touch-key to leaf through to the “

Free mixers

” menu

point of the multi-function menu:

mod. mem.

servo set.

D/R expo

wing mixer

base sett.

contr set.

phase trim

free mixer

servo disp