User manual

218
Program description - Dual mixers
Dual mixers
Same-sense/opposite-sense mixing of two control channels
This option is available as standard on the
mc-20 HoTT transmitter only.
Use the selection keys of the left or right
four-way button to scroll to the »Dual mi-
xers« menu option in the Multi-function menu:
Fl. phase timers
Wing mixers
Free mixers
MIX active/phase
MIX-only channel
Dual mixer
Helicopter mixer
Fl. phase timers
Free mixers
MIX active/phase
MIX-only channel
Dual mixer
Open this menu option with a tap on the center SET
key of the right four-way button:
Diff.
Dual mix
er
Mixer1
Mixer2
??
??
Mixer3
Mixer4
??
??
??
??
??
??
0%
0%
0%
0%
Similarly to a V-tail mixer, the four flight phase inde-
pendent dual mixers couple …
3
3
4
Servo
4 8 V
C 577
B s Nr 410
Servo
4 8 V
C 577
Bes Nr 101
4
V-tail mixer
Control function inputs
Control channels
(receiver outputs)
Elevator stick
Rudder stick
Right rudder / elevator
Left rudder / elevator
Rudder
Elevator
Elevator
Rudder
Rudder
Elevator
… a same-sense “ ” and an opposite-sense “
” control function, although they permit any channel
to be used and offer differential travel for the opposing
function.
Important notice:
Since the same and opposite sense influences of the
given input on the two servos or rudder flaps – cou-
pled to one another by the dual mixer – are deter-
mined by, among other things, their installation situa-
tion and the direction of rotation specified in the
»Servo adjustment« menu, the symbols “ ” and
“ ” are to be perceived more as synonyms rather
than as consistently appropriate definitions! Accord-
ingly, if wing flaps are deflected in the wrong direc-
tion, simply swap the two inputs or use the “servo re-
verse” option in the »Servo adjustment« menu; see
page 112.
In the software, the V-tail mixer already mentioned is
supplemented by other “dual mixers” for realization
of the two aileron servos on receiver outputs 2 and
5 and for the flap pairs on outputs 6 and 7, possibly
also 9 and 10. These are activated via the aileron
stick and the transmitter control that has been as-
signed to input “6” on the »Control adjust« menu.
In the same way, the four freely-programmable dual
mixers on this menu can be used to couple two fur-
ther control functions, a feature that would otherwise
only be possible with time-consuming programming of
free mixers.
Here, we will use a “V-tail with rudder differential” as
our example to explain the programming of a dual
mixer (see also the examples on page 296):
Use the Select buttons of the left or right-hand four-
way button to select the column you wish to access.
Press the central SET button of the right-hand four-
way button to activate the Value field, and then set the
desired value using the Select buttons:
Diff.
Mix
er1
Mixer2
EL
Mixer3
Mixer4
??
??
??
??
??
??
0%
0%
0%
RU
+25%
Dual mixer
In the dual mixer shown in our example the two ser-
vos connected to receiver outputs 3 and 4 move in
the same or opposite direction depending on the di-
rection of movement of the associated stick, and thus
operate as elevators or rudders. The differentiation,
according to dual mixer configuration, is only effective
for rudder activation.
In this case, both corresponding trim lever are effec-
tive. No additional free mixers are required for this
arrangement.
When using this mixer, however, the tail type
MUST be entered as “normal” on the “Model type”
menu.
Tip:
All settings can be checked directly in the »Servo
display« menu, which can be accessed from almost
any other menu by simultaneously tapping the 
keys on the left four-way button.
Example:
Model with two rudders, with differential travel and
outward movement (e. g. swept-back flying wing):
mc
 
16 20