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===== tandem rotor in tx ccpm mixing =====

So I've been hooked on the idea of a tandem rotor helicopter lately, but all mixing boards for this purpose are out of production as far as I can tell. This left me pondering doing the mixing in the tx using the many virtual channels Deviation tx provides.

What follows is part of the .ini file for the model config I've created.

Features:

- mixing to 2x 3servo swashplates plus throttle (7ch)

- easy adjustment of mixing percentages and curves (virt channels)

- separate elevator and differential collective pitch (DCP) mixes for FF

- a fancy layout to display stick and mixer ouputs seperately

- sticky throttle hold (Virt1)

- Ch 1: throttle

- Ch 2, 3, 4: front swash (2 forward, 1 rear)

- Ch 5, 6, 7: rear swash (2 forward, 1 rear)

For now it is a proof of concept with no hardware to test it on. Given my success with this config I am moving to do a test platform, but it'll be a while before I have time and some pieces arrive in the mail.

I'd love to hear what the community thinks of the viability of this approach, and yes I know there will be no stabilization.

----------------------------------------------------------------

name=Tandem

mixermode=Advanced

[radio]

protocol=None

num_channels=7

fixed_id=123456

tx_power=150mW

[channel1]

safetysw=Virt1

safetyval=-100

max=100

min=-100

template=complex

[mixer]

src=THR

dest=Ch1

scalar=0

offset=50

usetrim=0

curvetype=expo

points=0,0

[mixer]

src=THR

dest=Ch1

switch=FMODE0

usetrim=0

curvetype=3point

points=-100,50,50

[channel2]

max=120

min=-120

template=complex

[mixer]

src=Ch2

dest=Ch2

scalar=0

usetrim=0

curvetype=fixed

[mixer]

src=!Virt2

dest=Ch2

usetrim=0

muxtype=add

[mixer]

src=!Virt4

dest=Ch2

usetrim=0

muxtype=add

[mixer]

src=!Virt5

dest=Ch2

usetrim=0

muxtype=add

[mixer]

src=Virt7

dest=Ch2

usetrim=0

muxtype=add

[mixer]

src=!Virt9

dest=Ch2

usetrim=0

muxtype=add

[channel3]

max=120

min=-120

template=complex

[mixer]

src=Ch3

dest=Ch3

scalar=0

curvetype=fixed

[mixer]

src=Virt2

dest=Ch3

usetrim=0

muxtype=add

[mixer]

src=!Virt4

dest=Ch3

usetrim=0

muxtype=add

[mixer]

src=!Virt5

dest=Ch3

usetrim=0

muxtype=add

[mixer]

src=Virt7

dest=Ch3

usetrim=0

muxtype=add

[mixer]

src=Virt9

dest=Ch3

usetrim=0

muxtype=add

[channel4]

max=120

min=-120

template=complex

[mixer]

src=Ch4

dest=Ch4

scalar=0

usetrim=0

curvetype=fixed

[mixer]

src=Virt4

dest=Ch4

usetrim=0

muxtype=add

[mixer]

src=!Virt5

dest=Ch4

usetrim=0

muxtype=add

[mixer]

src=Virt7

dest=Ch4

usetrim=0

muxtype=add

[channel5]

max=120

min=-120

template=complex

[mixer]

src=Ch5

dest=Ch5

scalar=0

usetrim=0

curvetype=fixed

[mixer]

src=!Virt2

dest=Ch5

usetrim=0

muxtype=add

[mixer]

src=!Virt4

dest=Ch5

usetrim=0

muxtype=add

[mixer]

src=Virt5

dest=Ch5

usetrim=0

muxtype=add

[mixer]

src=Virt7

dest=Ch5

usetrim=0

muxtype=add

[mixer]

src=Virt9

dest=Ch5

usetrim=0

muxtype=add

[channel6]

max=120

min=-120

template=complex

[mixer]

src=Ch6

dest=Ch6

scalar=0

curvetype=fixed

[mixer]

src=Virt2

dest=Ch6

usetrim=0

muxtype=add

[mixer]

src=!Virt4

dest=Ch6

usetrim=0

muxtype=add

[mixer]

src=Virt5

dest=Ch6

usetrim=0

muxtype=add

[mixer]

src=Virt7

dest=Ch6

usetrim=0

muxtype=add

[mixer]

src=!Virt9

dest=Ch6

usetrim=0

muxtype=add

[channel7]

max=120

min=-120

template=complex

[mixer]

src=Ch7

dest=Ch7

scalar=0

usetrim=0

curvetype=fixed

[mixer]

src=Virt4

dest=Ch7

usetrim=0

muxtype=add

[mixer]

src=Virt5

dest=Ch7

usetrim=0

muxtype=add

[mixer]

src=Virt7

dest=Ch7

usetrim=0

muxtype=add

[virtchan1]

name=Safety

template=complex

[mixer]

src=Virt1

dest=Virt1

usetrim=0

curvetype=min/max

points=0

[mixer]

src=THR

dest=Virt1

offset=-1

usetrim=0

muxtype=add

[mixer]

src=THR

dest=Virt1

switch=GEAR1

usetrim=0

curvetype=fixed

[virtchan2]

name=AIL mix

template=simple

[mixer]

src=Virt3

dest=Virt2

scalar=30

[virtchan3]

name=AIL d/r

template=expo_dr

[mixer]

src=AIL

dest=Virt3

scalar=50

curvetype=expo

points=0,0

[mixer]

src=AIL

dest=Virt3

switch=DR1

curvetype=expo

points=0,0

[virtchan4]

name=ELE mix

template=complex

[mixer]

src=Virt6

dest=Virt4

scalar=10

curvetype=5point

points=-100,-25,0,25,100

smooth=1

[virtchan5]

name=Diff CP

template=complex

[mixer]

src=Virt6

dest=Virt5

scalar=0

usetrim=0

curvetype=fixed

[mixer]

src=Virt6

dest=Virt5

scalar=20

muxtype=add

curvetype=5point

points=-25,-75,0,75,100

smooth=1

[virtchan6]

name=ELE d/r

template=expo_dr

[mixer]

src=ELE

dest=Virt6

scalar=50

curvetype=expo

points=0,0

[mixer]

src=ELE

dest=Virt6

switch=DR1

curvetype=expo

points=0,0

[virtchan7]

name=Pitch mix

template=simple

[mixer]

src=Virt8

dest=Virt7

scalar=40

[virtchan8]

name=Pitch

template=complex

[mixer]

src=THR

dest=Virt8

scalar=0

usetrim=0

curvetype=fixed

[mixer]

src=THR

dest=Virt8

switch=FMODE1

usetrim=0

muxtype=add

curvetype=3point

points=0,50,100

[mixer]

src=THR

dest=Virt8

switch=FMODE2

usetrim=0

muxtype=add

curvetype=3point

points=-20,50,100

[mixer]

src=THR

dest=Virt8

switch=Virt1

scalar=0

usetrim=0

curvetype=fixed

[virtchan9]

name=RUD mix

template=simple

[mixer]

src=Virt10

dest=Virt9

scalar=20

[virtchan10]

name=RUD d/r

template=expo_dr

[mixer]

src=RUD

dest=Virt10

scalar=50

curvetype=expo

points=0,0

[mixer]

src=RUD

dest=Virt10

switch=DR1

curvetype=expo

points=0,0

[[ .:tandem_rotor_in_tx_ccpm_mixing:tandempoc ]]
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