Multiplex Profi TX User manual

Profi Tx – Tutorial – No2 Mixers
6th Dec 2015
Revision 2

Profi - Mixers
Revision history
Revision 1 – 24th Nov 2015 – nitial ssue
Revision 2 – 6th Dec 2015 – section 5 added and minor
corrections

Profi - Mixers
This tutorial runs through the use of the mixers on the Profi,
it will be in 4 sections
1 – Mixer Structure overview
2 – nbuilt mixers for Aileron Differential and Aileron/Rudder
mixing
3 - Servoside Multi-mixers
4 – Control mixers
5 - Other

Profi - Mixers
1 – Mixer overview
The above schematic simplified representation of the Profi mixer structure, key points to note are
- There are two control mixers which can have two inputs, or a control can be mixed with itself,
the mix percentage can be flight phase specific. These are like the traditional P mixes on other
radios
- The Servo-side mixers are the key to the Profi and replace the normal named mixers on other
radios. These are created by the user, either from scratch or using the provided templates. The
mixer outputs are then assigned to output channels, just like a non-mixed control. The Profi
can use upto 5 mixers per model memory and each mixer can have upto 8 inputs, all
switchable, each input can use either predefined curve or a user created curve. Each mixer can
be used multiple times, i.e. only one mixer required for dual ailerons.
- There are two defined mixers for aileron differential and aileron/rudder, the mix percentages
can be flight phase specific

The Profi includes 2 defined mixers which are non-editable, an aileron differential mixer and
aileron-rudder combi mixer. These are always available and are setup by entering the Mixer
settings menu (GH 2)
The aileron differential mixer is used to set the aileron differential to reduce adverse yaw and/or
fine tuning the roll control on an aerobatic model to give a more axial roll. There are 3 settings for
the differential mix, ON, OFF and SPO LER+, the last option is used when you have ailerons raised
as spoilers (or in crow braking), in this mode the differential is suppressed when the ailerons are
raised so that the down going aileron has full movement for better roll control with the
spoilerons deployed. Note the differential can be set for individual flight phases and differential
can be + ve or –ve, this will depend on the model and the aileron servo set up.
Profi – Mixers
2 -Defined Mixers
The aileron-rudder mix is found under the Combi-Switch tab and this is used to mix some rudder
in when you move the aileron stick, useful for countering adverse yaw and balancing the turns
without having to move the rudder control. As for the aileron differential mixer, the mix %age can
be set for individual flight phases. Also the mix is switchable and a switch for this can be assigned
in the switch assignment tab in the Setup menu (ABC1), the switch can also be used for another
function if you wish, i.e. tow release on a glider so the aileron-rudder mix is off under tow but
becomes active once the tow release is activated. f no switch is assigned the mix is on when a
%age value is added.