GRAUPNER mx-20 Hott, Programming Manual

Page: 185 / 296

185 Detail program description - Control adjust
Use the option available to you at any time of •
switching to the "Servo display"

menu (see
page 230). This menu is reached from almost any
menu option on the transmitter's basic display
by briefl y tapping the keys on the left touch
pad at the same time. This menu gives you the
opportunity to check the effects of all of your
settings on a single screen.
Mixer ratios and mixer neutral point
Now that we have explained the wide-ranging nature of
the mixer functions, the following section describes how
to program linear and non-linear mixer curves.
For each of the 12 available mixers, the mixer curves
are programmed on a second page of the screen
display. Use the arrow keys

on the left or right
touch pad to select the desired mixer line. If necessary,
use the touch pad's arrow keys to move to the right
column ( ), and then briefl y tap the center
SET key on
the right touch pad in order to access the graph page .
Mixers M1 … 8: Setting linear mixer values
As a practical example, we will now defi ne a linear mixer
curve to resolve the following problem:
For our motorized aircraft model, the two servos connected
to receiver outputs 6
and 7 – defi ned on the "Aile/fl aps"
line of the "Model type" menu as "… 2FL" – are to
be deployed to activate landing fl aps. That is: when a
transmitter control is moved, they must defl ect downwards
only. This requires a simultaneous elevator trim, however.
First, use the
"Control adjust" menu to assign a control
such as the CTRL 6 proportional rotary control to input
6. Comment: in this case, a transmitter control on input
6 will control the two servos connected to receiver
outputs 6 and 7 as fl aps, by default – as you can see by
consulting the above table. Leave the default value of
"GL" in the "Type" column alone, however, to confi gure
this setting globally for all fl ight phases – as is the case
for the free mixer.
"Control adjust" menu
Input 5
offset
0%
0%
0% –––
0%
Input 6
Input 7
Input 8
–––
–––
GL
GL
GL
GL
typ
nor mal
Ct6
Note:
Note that if two fl ap servos have been selected, any
transmitter control assigned to input 7 will be decoupled
in the software in order to avoid errors in operating the
fl aps. However, in the interests of safety, you should
make a habit of leaving all inputs not currently required
to "free", or of resetting these back to "free"!
Start by moving this transmitter control to its left end-
point and adjust the landing fl aps so that they are
retracted or closed in this position. If you now move
the dial to the right, the fl aps should move downwards;
if not, you will need to adjust the direction of servo
rotation.
We now turn our attention to the fi rst mixer shown in the
screen image on page 182 ("6

EL"), to which switch 4
was assigned:
ty
fr
to
M1
M2
M3 6 EL
C1 EL
M4
M5 S EL
?? ??
Tr C4
4
2
?? ??
Briefl y tap the center SET key on the right touch pad to
open the second screen page:
OFF
L.MIX 1 6 EL
If this screen appears, the mixer has not yet been
activated using the assigned toggle switch – "4", in this
example. If so, operate the switch:
L.MIX 1
0% 0%
0%
Offset
ASY SYM
6 EL
Mix input
The solid vertical line represents the current position of
the transmitter control on input 6. (In the above diagram,
located at the left edge, since the CTRL 7 transmitter
control assigned to input 6 in this example (see previous
page) is turned fully to the left.) The dotted vertical line
in the middle of the diagram indicates the position of the
mixer neutral point – see under "Offset", below. The solid
horizontal line shows the mixer ratio, which currently has