Operation Manual

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Adlusting

tfie lransmittter

contrcls

In the

section

discussed

setting

up the

"servo

end"

of the system;

now it is time

to concern

ourselves

with adjusting

the

"signal

source",

namely

the transmitter

controls.

An important difterence

The systematic

ditferentiation

between

"transmitter

end" and

"servo

end"

important characteristic

the

philosophy

behind

the PROFI

mc 3010.

For this rea-

son

would like to explain

this difference

once

in brief

before we

get

down

to business.

Once

again, examples

are the

best method

of explana-

üon.

ll vou want to

reduce the effectiveness

of the elevator,

mäy seem

to make

difference

whether

you

reduce

the travel

of the elevator

stick or electronically

reduce

the servo's

travel.

But

this is only true

if the application

is of the simplest

possible

type,

i.e. no signals are

"derived",

"mixed"

otherwise

influenced.

lf we

assume

in our example

that

there

are two elevator

servos

(e.9.

one for each elevator

panel),

then,

it we insist on

working at the

"servo

end",

the travel

of both servos

would have

reduced

separately.

Things

get

a little more difficult

il we suppose

that el-

evator

movement

also

intended to

involve the cam-

ber-changrng

flaps. ln this case

we would

need to re-

duce

the

"mixed

elevator

input"

to the flaps also;

other-

wise the

ratio of the

mixed functions

would alter.

How-

ever,

if we reduce the

movement at

the transmitter end,

things

are much easier:

all

we have to do

is reduce the

elevator

stick signal;

everything

that ls affected

by or de-

rived

from that signal

is automatically

reduced at

the

same

time.

second

example

would be

differential aileron

move-

ments

where

two separate aileron

servos are

used.

differential

is nothing more than

unequal servo

travel on

different

sides

ot neutral,

it would be

possible

to adjust

the

servos

themselves

individually.

But it is easier

if we

produce

the two aileron

control signals

at the stick

by a

"differential

circuit",

can

then set

the degree

differential

with one single

adjustment.

Correct

assignment

is important!

lf the differential

ffi

movement of

your

ailerons

works the

wrong way round,

please

see

page

33.

A turther example

is reversing

the direction

of rotation:

When

we reverse the

direction

of movement at

the

transmitter

control,

then this

reverses the

rotational di-

rection of all

the servos

(or,

precisely,

all the inputs

f rom this control)

which are

operated by

this transmitter

control.

This is not the same

reversing the servo

it-

self.

You can

probably

see

the

principle

already:

We have a

"flow

of signals", starting

at the

transmitter

controls

(the

signal

"source").

The

various influences

on the

signal then

mixing arrangements,

signal

splitting

etc.

The servos and the

control surfaces

which

they operate

are the

final link in the chain.

lf we alter something at

the source

the transmitter

controls

then

that change affects

everything

which

influenced

by that control.

Each

transmitter control

is assigned

to a

particular

con-

trol

function

(elevator,

aileron,

. .). li

change

is made

to the transmitter

control,

that change

affects the entire

control

function

and

this is exactly

what

usually

re-

ourred.

One

more example:

you

want exponential

aileron con-

trol on a model

fitted with

"quadro-flaps"

(four

sepalate

wing control

surfaces),

then the entire

"aileron"

func-

tion needs

to be altered,

i.e. all four servos

at once.

lf, on the other

hand,

we try to set that

up by adjusting

one of the

servos, the change

will

only

affect that

one

servo.

To recap:

Adiustments at the

transmitter control

affect

the en'

tire control

function.

Adiustments

at the servo end

affect that

servo only.

Disfribution,

mixinq

The transmitter

control options

Now

it's time to discuss

the transmltter

control

adjust-

ment

facilities.

The complex-sounding

term

"transmitter

control

options"

is simply an overall

description

of the

adjustment

lacilities

which are

provided

for the

transmit-

ter controls.

You are

probably

familiar with

them already

from other

radio sets.

For example:

Dual Rates,

Expo-

nential

and so on.

These options

are supplied

"ready

made"

your

trans-

mitter, and

are oflered

via the

"Transmitter

Control

Ad-

justment"

menu. No

"assigning"

is necessary.

ln order

to activate

option,

you

simply

need to

"leat

through"

the appropriate

point

in the menu, then

set the

value

you

want. lf

you

do not need a

particular

option,

just

set

its value to 00/o

(or

1000/0, depending on

the type of

function).

Not all ootions are

available

tor

all

transmitter controls;

that would

not make sense

(who

would

want

retractable

undercarriage

with exponential

travel?).

The availability

the options

based

practical

requirements:

Dual Rates and

ExDonential:

Ailerons, elevator and

rudder.

Travel, adjustable separately

on both

sides of

neutral:

All functions exceDt

ailerons and

throttle.