Operation Manual

Supplementary Information
Supplement 97
Use of the Remote Control System
Treat your remote control equipment
carefully to ensure that it is always reliable
and ready for use.
Switch on the transmitter first, only then
switch on the receiver.
Switch off the receiver first and only then
switch off the transmitter.
If this sequence is not observed, i.e. the
receiver is switched on first with transmitter
switched off, the receiver can affected by
other signals and unpredictable results can
occur. The servos may jitter applying a
high load to the battery and cause it to
discharge quicker than expected.
If you notice the movement of the servos
becoming slower, the receiver battery is
discharging and it should charged or a new
battery fitted.
Extended the transmitter antenna fully
before commencing to fly.
In the direction the antenna points only a
small field strength is generated. It is
therefore wrong to point the antenna
towards the model for best reception.
With simultaneous use of remote control
sets on adjacent channels the pilots should
stand together in a loose group.
Plots not standing in the group endanger
both their and other models
.
Polarised Connectors
The plugs of the servos and the power
supplies are polarized can be inserted into
the receiver one way round. This is
achieved by one side having a bevelled
edge and the receiver sockets being
shaped accordingly
.
Installation of Receivers
The receiver be mounted in foam rubber to
protect it from impacts. It should also be
fitted behind a strong frame and/or in
vehicles or ship models protected from
dust and water splashes
.
The receiver should not be fitted directly
the fuselage, chassis or hull, since
otherwise engine vibrations, impacts or
landing shocks will transfer directly to it.
The receiver should be installed in such a
way that the antenna, servo and power
leads are not under tensions or otherwise
stressed.
Receiver Antenna
The receiver antenna is connected directly
to the case. The length is approx. 100 cm.
The antenna should be routed as straight
as possible and as far from electric motors,
servos, metallic linkages or power cables.
For flying models the antenna should be
routed out of the fuselage by the shortest
possible route and attached to the vertical
fin (you should use some strain relief!).
If the antenna should be longer than the
distance to the vertical fin, let it continue as
trailing antenna or route it to the wing tip
edge of the horizontal stabilise. Each such
bend in the antenna brings a loss of range.
With ships the position of the receiver
should be such that the receiver and the
antenna as far from drive electric motors,
power cables and metal parts.
A blade antenna with a free length or 80 –
100 cm is preferred for ship models over
every other antenna type.
With model cars, blade antennas work
satisfactorily. Here shortened antennas
can be used as the operating range is
relatively short.
Power Supply
The power supply for the receiver comes
from a rechargeable NiCd 4.8V battery
(see page 5 or the main GRAUPNER
catalogue). The battery should be wrapped
in foam and securely mounted to a strong
frame. The cables should be loosely routed
making sure that they remain so during
any movement of the battery.
The battery can be connected directly to
the receiver or by a switch harness.
Examination before Starting
You should check for correct function and
range before each use. Switch on the
transmitter then the receiver. Remove the
transmitter antenna. Check at an
appropriate distance from the model that
all the controls function perfectly and
move in the correct direction.
This check should also be done motor
running (an assistant can hold the model.
Installation of Control Linkages
The installation should be done so that the
linkages run freely and are low-friction.
Linkages and controls that are difficult to
operate absorb battery power, reduce the
actual working time and unfavourably
affect the control position accuracy.
Particularly important is that all control
horns can move through their full travel
and are not mechanically limited. Taking
account of these criteria, the linkages and
hinges in the model should be checked. Of
particular importance is the motor throttle
linkage. The "full power" position must be
determined by the stick position and
definitely not by the mechanical limits of
carburettor. As the model maybe at full
throttle for considerable periods the
additional drain of a stalled servo would
discharge the battery faster than expected.
Likewise the idle setting must be achieved
by the stick position and not mechanically
by limits of the carburettor.
Suppression of Electric Motors
Even high quality electric motors produce
sparks at the interface between the
brushes and the commutator. Depending
on the electric motor, these sparks can
cause interference with the radio signal.
Therefore, in models with electric drive, the
motor must be carefully suppressed. Radio
noise filter suppressors reduce these
malfunctions to a great extent and are
allow the radio system to operate normally.
Radio noise filters are to be installed as
close as possible to the motor (see figure).
Each electric motor should be fitted with
it’s own radio noise filter. When using
suppression filters consideration should be
made of the manual of the respective
electric motor. Interference suppression
should be checked before use of the
model, to ensure sufficient range between
transmitter and receiver is available.
Suppression Filter
Part No. 3361 18A
Part No. 3362 36A
Pre-built Units. Simply soldered between
the electric motor and the power cables
(see figure). The range of the remote
control system is better when using optimal
interference suppression and the safety of
operation of the model is increased.
The filter absorbs the noise spikes created
by electric motors and therefore protects
electronic speed controllers.
Electric RC car models with mechanical
speed controllers have only basic filtering
from the factory. When subsequently fitting
an electronic speed controller the motor
must then be adequately suppressed.
Servo Extension Lead Suppression.
Part No. 1040
A servo lead suppression is needed when
using long servo leads as the filters in the
receiver are insufficient. A filter should be
fitted next to the receiver. In critical cases
a second filter at the servo can be fitted.
Length approx. 200 mm, weight approx. 3g
Servo Plug
Servo plugs are removed from the receiver
socket by pulling about 5-10 cm away from
the plug inline with the pin connections.
Battery Capacity & Period of Use
This applies to all battery source: At low
temperatures the capacity decreases
considerably, therefore the periods of use
in cold weather are shorter. The available
battery power must be checked more
frequently.