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The switch
harness
This
is
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
in
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)
is
the
more
"intelligent"
of the
two transmission
methods.
In the case of
PCM
the
information
is
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
of
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
7
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
at
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
is
a
fea-
ture
of the
receiver, and
must be switched on
before
it can
work.
Single-superhet
or double-superhet?
lf
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
72
Arrangement
of battery,
servos
and
receiver
The diagram below
shows
the most
favourable
arrangement
of the
RC
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:
a
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.
o
Protect the receiver
from vibration by
wrapping
it in
foam rubber and stowing
it
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.
a
lf
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.
We
have cooked
up a standard
recipe
for range testing
74


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