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.

The servoside mixers are the key to getting the best out of your Profi and are significantly
different from the control mixers found on most other radios. n the Profi the mixers are created
either from scratch or using the supplied editable templates and then assigned to outputs. Each
mixer can have a total of 8 control inputs and each model memory can have 5 servoside mixers
which can be used multiple times, i.e. you only need one Aileron+ mixer for 2 or 4 separate
aileron surfaces. The first step in using the mixers is to edit one of the presupplied templates or
create your own, this is done in the Define Mixer tab under Setup (ABC1)
Here the mixer list includes supplied templates for Elevator, V-Tail, Ailerons, Flaps nner and
Centre and two blank templates, 7 showing when you scroll down, to change any mixer settings
scroll down to the mixer and enter. Note the above mixer list is the standard mixer templates
loaded for the Glider+ template loading when selecting a new model.
Profi – Mixers
Servoside Mixers

Profi – Mixers
Servoside Mixers
This shows the name of the
mixer, which you can edit, once
a mixer is created it shows up
in the servo assignment tab
(under servo menu JKL4) and
can be assigned to as many
servo channels as you like
The control inputs are listed in the
first column, these can be changed or
new ones added by scrolling down to
the input, pressing enter and then
either operating the control or
scrolling through them.
The 2nd column determines the switch that is used to
activate this mix, this can be selected by either
moving the switch or scrolling through them, note
flight phases and magicswitches can only be selected
by scrolling . Here the flight phases are used as
switches to activate the mixer inputs. f no switch is
selected then the mix is live and values entered in
the mixer menu (GH 3) are always active.
The 3rd column determines the mixer curve for
that input, this can either be one of the
predefined curves as shown by the below
symbols or a user generated curve. These are
selected by scrolling through them and
pressing enter

Profi – Mixers
3 - Servoside Mixers
The mixer curves available in the 3rd column are listed below

Profi – Mixers
3 - Servoside Mixers
Depending on the type of curve selected the
amount of output from that input is selected in the
mixer setup menu (GH 3)
The standard mixer curves are shown in the manual and referenced
here

Profi – Mixers
3 - Servoside Mixers
Depending on the type of curve selected the
amount of output from that input is selected in the
mixer setup menu (GH 3) , on the standard curves
this will be one or two values depending on the
type of curve used
The standard mixer curves are shown in the manual and referenced
here

Profi – Mixers
3 - Servoside Mixers
The standard mixer curves can be augmented to adjust the nature of
the curves as follows

Profi – Mixers
3 - Servoside Mixers
Only 4 control inputs are used in this
mixer, but there are a further 4 slots
for additional inputs if required.
Elevator –T means that elevator trim
has no effect and this option is
available for rudder and aileron
inputs as well.
The 2nd column shows that Flap control
input is only active in flightphase 1,
spoiler in flight phase 2, aileron in flight
phase 3 and elevator input is always
available
The 3rd column determines the mixer curve for the representative input, in this example
Flap is the primary input to the NNER FLAPS and is asymetrical with both surfaces
moving in the same direction, in the mixer Menu (GH 3) the flap travel can be adjusted
for reflex and thermal, Spoiler input is with a single sided curve with offset, so the
position of the flaps is offset to allow full servo movement to be utilised, Aileron input
is using an asymetric curve with surfaces moving in opposite directions, this allows flap
to be mixed with aileron and up and down travel to be set separately. The last
remaining listed input is Elevator less Trim, asymetrical with both surfaces moving in
the same direction, this allows the elevator to move the flaps (snap flap), note the input
is –T, meaning input is from the stick movement only and trim has no effect on the
flaps.
Here is an example of setting up the supplied flap mixer template, first
in the mixer definition screen

Profi – Mixers
3 - Servoside Mixers
Aileron input to the flaps is 30% in
one direction and 70% in the other,
note “–” needed get the correct
direction, rather than swap the flap
channels over!
Elevator input to flaps is off in both directions,
meaning there is no snap flap on this model
Flap control input has been limited to
4% in one direction and 12% in the
opposite direction, the reflex and
thermal settings on this model,
meaning when the flap slider is fully
one way the model is in reflex mode
and thermal mode when the slider is
in the opposite direction.
This is an example of the mixer inputs in the Mixer menu (GH 3) for the
FLAP_ NNR+ mixer
n the spoiler input , with the spoiler
control (e.g. slider or throttle stick) in
the raised position then the flaps are
offset by 5% and move to the -70%
position when spoiler is deployed.
Note that on this screen the spoiler is
active as shown by the astrisk, so
any changes made now would be
seen on the model.
When ’m setting up flaps on a glider, would normally start with flap
input at 100% and all other inputs OFF, then in the servo calibrate
menu, calibrate both servos so that their travel matches at both ends
of the flap control and they match when the control is centred, or all 5
points if using a 5 point calibration curve. Then going to the mixer
menu, make the spoiler control active and set the spoiler offset and
spoiler travel, before inputting the required flap and aileron travels.

Profi – Mixers
3 - Servoside Mixers
Only 4 control inputs are used in this
mixer, but there are a further 4 slots
for additional inputs if required.
The 2nd column shows that Spoiler control input is
only active in flightphase 3, aileron, flap and
elevator input is always available
The 3rd column determines the mixer curve for the representative input, in this example
Aileron is the primary input to the A LERONS+ and is symmetrical with both surfaces
moving in the opposite directions (2), in the mixer Menu (GH 3) the aileron travel can
be adjusted (Differential is best adjusted in the specific differential mixer covered
earlier) , Spoiler input is with a single sided curve with offset, allowing the ailerons to
be raised more without wasting any available servo rotation by off setting the servo
centre point., if you have both ailerons raised as spoilers it’s recommended to set the
aileron differential to SPO LER+ in the differential settings as this suppresses differential
when both ailerons are raised. The last remaining 2 input are Flaps for using the
ailerons to adjust the wing camber and Elevator less Trim, asymetrical with both
surfaces moving in the same direction, this allows the elevator to move the ailerons
(snap flap), note the input is –T, meaning input is from the stick movement only and
trim has no effect on the A LERONS+ output.
Here is an example of setting up the supplied aileron mixer template,
first in the mixer definition screen

Profi – Mixers
3 - Servoside Mixers
Although Flaps and Elevator inputs
are available, no input has been
specified so these controls have no
effect on the A LERON+ output
Spoiler input is set at 40% and is active in
Flightphase 3, note no offset required as servo
centre point is with the ailerons at neutral position
on this model.
As expected the aileron input is always on and set too 100% in both directions, with
differential being set in the aileron differential mixer
Here is an example of setting up the supplied aileron mixer template,
here are the settings in the mixer menu (GH 3)

Profi – Mixers
3 - Servoside Mixers
n the mixer definition menu (ABC1) a new mixer called Wheel+ was created,
which was assigned to the nose leg servo channel in the servo assignment
menu (JKL4), an input from the rudder was added to use curve 1
Apart from the standard curves the Profi gives you the option to create
a bespoke curve if you require, here’s one made up to mix rudder
control into nose wheel steering
n the mixer menu (GH 3) opening the Wheel+ mixer and rudder input
opens the seven point curve, scrolling down to each position P1 thru P7
allows you to specify the mix input at each position.

Profi – Mixers
3 - Servoside Mixers
n the mixer definition menu (ABC1) a new mixer called Wheel+ was created,
which was assigned to the nose leg servo channel in the servo assignment
menu (JKL4), an input from the rudder was added to use curve 1
Apart from the standard curves the Profi gives you the option to create
a bespoke curve if you require, here’s one made up to mix rudder
control into nose wheel steering
n the mixer menu (GH 3) opening the Wheel+ mixer and rudder input
opens the seven point curve, scrolling down to each position P1 thru P7
allows you to specify the mix input at each position.

Profi – Mixers
4 - Control Mixers
The amount of mix input in each
direction, can be specified, note
these can be flight phase specific
n addition to the other mixers the Profi provides two control mixers
and these are found in the Mixer Menu (GH 3) as Ctrl. Mix 1 and Ctrl.
Mix 2, entering these brings up the screen where the controls to be
mixed can be specified and set up.
The mix can be on a switch if
required
The source and target controls are
specified, here rudder is the
source and will have effect on the
elevator, i.e. to keep the model
flying straight in knife edge.
The zero point of the mix,
either symmetrical as shown
here acting around the centre
point or single sided acting
from one side can be specified

Profi – Mixers
5 - Other
Here in flight phase 2, set as
NORMAL on this model, the spoiler
control is fixed at -100%, these
means the spoiler control has no
effect on the spoilers, if used, or any
mixer that has spoiler as an input.
Here in flight phase 3, LAND NG, the
fixed input is OFF, this means that the
spoiler control is active and the spoilers,
if used, or any mixer that has spoilers as
an input will respond to the spoiler
control. Note also the slow setting, so if
flight phase is switched and control is in
fully deflected position , affected
surfaces will only move slowly
i) Using Fight Phases to fix mixer inputs
An alternative to activating inputs in each mix is to us the
settings in the controls menu (DEF2) for flaps, spoilers, aux, controls
etc to lock those controls in different flight phases as follows. This
locks the control and could be used to make it effective in say flight
phase 1 and 3 and not in 2 or 4.

Royal Pro/Sx – Mixers
5 - Other
n the mixer definition menu in
setup (ABC1) add two inputs from
the same control with separate mix
switches. Here on the FLAP_ NNR+
’ve created two inputs for the flap
control, inputs 1 and 3, and
activated by flightphase 1 and 2.
Note the curves are the same, but
you could if you wish have different
effect curves
n the mixer set up menu
(GH 3) different values can
be entered for the two
separate flap inputs.
ii) Using Flight Phases to adjust mixer inputs
f you wish to have a varying amount of mix depending on
what flight phase you are in, e.g. say you wish to have more flap
movement in the launch phase and less in the thermal phase this can
be accomplished by using two input lines in the mixer definition screen
activated by separate switches and then entering different values in
the mixer menu.