GRAUPNER mx-16 ifs, Programming Manual

Page: 88 / 132

88 Program description: free mixers
General notes regarding freely programmable mixers
The two menus » wing mixer « and » heli mixer «, as
described on the preceding pages, contain a wide range
of ready-programmed coupling functions. The basic
meaning of mixers has already been explained on page
72, together with the principle on which they work. In the
following section you will fi nd more general information
relating to “free mixers”:
In addition to the pre-programmed mixers mentioned
above, the
mx
-16iFS offers three freely programmable
linear mixers which can be used in every model memo-
ry; 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 defi ned, for example, in the » D/R expo « and
» contr set. « 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 infl uences which can act upon it are those defi ned
in the »
servo set. « menu, i. e. the servo reverse, neutral
point offset 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 defi nes 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 7 or
INC / DEC buttons CTRL 5 / 6) at which the mixer
has no infl uence on the control channel connected
to its output. Normally this is the centre point of the
transmitter 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 input; a typical application would
be for slight up-elevator trim when an aero-tow coupling
is closed – 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 defl ection by altering the mixer
input.
To identify this special arrangement, this mixer input con-
trol function in the software is designated “S” for “switch
channel”. If you do not want the “target channel” to be af-
fected by the “normal” transmitter control, the control can
be de-coupled from the function input of the associated
control channel by entering “empty” in the »
contr set. «
menu; see pages 58 and 60. The following menu descrip-
tion includes an example which makes this function clear.