Bedienungsanleitung Multiplex PROFImc3010 (Seite 74 von 79) (Englisch)

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The switch

harness

This

plugged

into socket

8". The switch

incorpo-

rated

in the harness

is used to

turn the whole

receiving

syslem

on and

otf. The switch

itself can be

installed

the model's

fuselage side.

Switch

harnesses

are available

in several

forms;

please

refer to the

main MULTIPLEX

catalogue

for

details.

Some

versions are

fitted with a separate

socket

for charging

the receiver battery.

On the switch

harness supplied

with the set

(Order

No. I 5100)

the

charge socket

is integral

with the switch casing.

This

means

that the battery

can be recharged

without

hav-

ing

to open up the

model

(Fig.

62).

Fig.62

PPM or

PCM?

PCM

(Pulse

Code

Modulation)

the

"intelligent"

of the

two transmission

methods.

In the case of

PCM

the

information

encoded

by the transmitter.

The

receiver is able

to recognise

interference, and contin-

ues lo send

the last

"good"

signals to the servos

until

it again

receives a signal

from the transmitter

(see

Fail

Safe).

Thus PCM eliminates

servo

jittering.

On the

other hand, this

interference suppression

can

lead to the PCM

pilot

failing to

notice interference until

much later than

with a PPM system.

PPM

(Pulse

Position Modulation) still

has the advan-

tage if

you

require ultrajast control

response

from

your

model, because

the

information is broadcast

by the

transmitter

at a

faster rate than bv a

PCM transmitter.

Which types

receiver

can

be used?

PCM

All

MULTIPLEX

PCM receivers can

be used

with

your

new transmitter.

PPM

when set

to PPM, the transmitter

broadcasts

either

or I channels

(see page

13 for method

of switching).

This

means that

you

can

use all

MULTIPLEX

FM PPM

receivers

(and

all FM

PPM receivers

which can

decode

least 7 channels)

with this transmitter.

Fail-Safg

("emergency

position"

lor

servos)

Only

available

with PCM-DS

receivers!

After about

0.8 seconds

of interference

the throttle

servo

runs to the

250lo

Dosition,

and all

the other ser-

vos are

automatically

reset to centre.

Fail-sate

fea-

ture

of the

receiver, and

must be switched on

before

it can

work.

Single-superhet

or double-superhet?

you

operate

your

model

in the vicinity of a

powerful

VHF radio

transmitter

(frequency

range

103 to

105

MHz), conventional

radio control systems

(single-su-

perhet)

in the

35 MHz band can

suffer

from interfer-

ence.

In technical terms:

the

powerful

transmitter

pro-

duces

adjacent-channel

interlerence

to the single-su-

perhet

receiver. The double-superhet

receiver utilises

different

technology

which eliminates the

problem

alto-

gether

Arrangement

of battery,

servos

and

receiver

The diagram below

shows

the most

favourable

arrangement

of the

system

components

in the

model. We

recommend that

you

decide

exactly

how

your

system

is to be installed

in the new

model

before

vou start construction.

Servo Switch

Receiver

Fig.63

The

receiver

When installing the

receiver

in the model,

please

observe

the

following

points:

Keep the

receiver

well

away

trom

powerf

ul electric

motors and electric

ignition systems.

Lead the receiver aerial

out o{ the

model by the

shortest

possible

route.

Protect the receiver

from vibration by

wrapping

it in

foam rubber and stowing

loosely in the model.

Never alter

the length of

the receiver aerial.

Deploy the receiver aerial

in as straight

a line as

possible.

Never leave it coiled up

in the

model.

your

model

incorporates carbon

f ibre reinforce-

ments, do not deploy

the receiver aerial

inside the

fuselage

(signal

screening)

Do not stick the

receiver aerial

to any

part

of the

model

which is reinlorced

with carbon

fibre

(signal

screenrng).

Range

testing

Range testing

can make a significant

improvement to

safety

levels when

you

are

operating

your

model.

have cooked

up a standard

recipe

for range testing

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