GRAUPNER MC-22S, Programming Manual

Page: 104 / 180

104 Program description: Mixers
made to operate with a delay by assigning a time va-
lue in the “-Time+” column of the “Transmitter control
settings” menu. For more information on this please
refer to the programming example entitled “Control-
ling timed sequences” on page 136.
Before we move on to setting mixer ratios and con-
clude with a few examples, we have to consider what
happens if we
allow a mixer input to act on the pre-
set coupling of aileron servos, fl ap servos or coll-
ective pitch servos:
• Fixed-wing models:
Depending on the number of wing servos set in
the »
Model type « menu, outputs 2 and 5 at the
receiver are reserved for the aileron servos, and
outputs 6
and 7 for the two fl ap servos.
When programming mixer outputs to act on such
coupled functions, you have to consider the cont-
rol channels upon which they act:
Mixer Effect
NN 2 Aileron effect retained
NN 5 Aileron plus fl ap function
NN 6 Flap effect retained
NN 7 Flap plus aileron function
• Model helicopters:
Depending on the heli type, up to four servos may
be employed for collective pitch control, connec-
ted to receiver outputs 1, 2, 3 and 5; the mc-22s
software links them together to provide the collec-
tive pitch, roll and pitch-axis functions. It is not ad-
visable to mix one of the transmitter controls into
these occupied channels using the free mixers
available outside the »
Helicopter mixer « menu,
as you may inadvertently generate some extreme-
ly complex and unwanted inter-actions. One of the
few exceptions to this rule is “Collective pitch trim
via a separate transmitter control”, as shown in
Example No. 3 on page 107.
Important notes:
• It is essential to remember when dealing with serial
links that the travels of the individual mixers are cu-
mulative when multiple stick commands are made
simultaneously, and the servo concerned may then
strike one of its mechanical end-stops at the extre-
me of travel. If necessary reduce the servo travel;
alternatively use the “Travel limiting” function in the
»
Servo adjust « menu, and / or reduce the mixer
values.
• When using a PCM transmission link the control
data is compressed before being transmitted, and
if you use more than eight servo outputs on a PCM
receiver with a resolution of 512 steps per chan-
nel, the servos connected to receiver outputs 9 and
10 may be slightly less than smooth-running if you
have set up the mixers “1
9”, “1 10” and “2
10”. If you are using one of the new SPCM recei-
vers which offer higher system resolution, these ef-
fects may occur at outputs 9 and 10 if you have
programmed mixer combinations in which sever-
al servos are operated in parallel by one transmit-
ter control. This does not constitute a malfunction
of the radio control system.
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 six available mixers the mixer curves
are programmed on a second page of the screen dis-
play. Select the number of the mixer you wish to ad-
just, and select the arrow button „
“ using the rotary
control. A brief press on the rotary control or the EN-
TER button takes you to the graphic page.
Linear mixers 1 ... 4: setting linear curves
As an example with a practical application we will de-
fi ne a linear mixer curve in the following section desi-
gned to solve the following problem:
We have a powered model with two fl ap servos con-
nected to receiver outputs 6
and 7, which were pro-
grammed in the » Model type « menu. The fl aps are to
be employed as landing fl aps, i.e. when the associa-
ted transmitter control is operated, they defl ect down
only. However, this fl ap movement requires an eleva-
tor trim correction to counteract a pitch trim change.
In the » Control adjust « menu we assign a free line-
ar slider to input 6, e.g. control 7. The control assig-
ned to input 6 now controls the two servos connected
to receiver outputs 6 and 7 in the standard way, ope-
rating as simple wing fl aps.
» Control adjust « menu:
%NTER#NTR
%NTER#NTR
%NTERFREE
%NTER#NTR
iNORMALwOFFSETTRAVELTIME
39-!39 !39 39- 3%,
T
S
3%,
Note:
If you select two fl aps (“2 FL”) in the »
Model type «
menu, input 7 is automatically blocked to avoid pos-
sible malfunctions. However, in the interests of safe-
ty we strongly recommend that you make it a routi-
ne matter to set all non-required inputs to “free” in any
case.
Start by moving this transmitter control to the forward
end-point, and adjust the landing fl ap linkages so that
they are in the neutral position at this slider setting. If
you pull the slider back, the fl aps should move down;
if not, you must reverse the direction of servo rotation.
Now we turn to the fi rst mixer on the screen shot