Order Numbers
F4090 - F4091 - F4092
F4095 - F4096 - F4097
49
12.Connecting the receiving system,tips on installation
Connecting the receiver
Receiver aerial
The receiver aerial is attached directly to the receiver.It is about 100
cm long and must not be shortened or extended.The aerial should
be routed as far as possible away
from electric motors, servos,
metal pushrods and high-current
cables.
Do not deploy the aerial in an exactly straight line. It is better to
tension it to the fin tip with a rubber band and allow about 10 - 15
cm to trail freely,forming an L-shape.This helps to prevent "blind
spots" and "glitches" when flying.
If this is not possible, we
recommend that you deploy the
aerial in an S-shape inside the
fuselage, as it will take up little
space in this configuration.
Wind the wire onto a small plate
made of card, plywood or plastic, as shown in the sketch here, and
locate it close to the receiver if possible.This does not affect effective
range.
Avoid aerial damage by fitting a tension relief and guide,e.g.a short
piece of fuel tubing, where the wire exits the fuselage.It is essential
to ensure that the aerial cannot foul the propeller.
If your model has a carbon fibre fuselage, the aerial must be
deployed outside it, and should not even run parallel to the
fuselage,as the shielding effect of this material can cause reception
problems.
Switch harness
It must be possible to operate the receiving system switch easily,
without mechanical restriction, i.e. the cut-out in the fuselage side
must be large enough to avoid obstructing the mechanism. In
powered models with internal-combustion engines the switch
should be mounted on the opposite side to the exhaust,to avoid the
danger of oil penetrating the switch and soiling the contacts.
Servo leads
When deploying servo leads ensure that they are not under any
mechanical strain and are not kinked or bent tightly, as this might
cause them to fracture over time. Make sure there are no sharp
edges which might damage the cable insulation. All connectors
must be firmly fitted and secure.When disconnecting them, pull on
the plastic housings - not on the wires.
Servo leads should not just be left dangling inside the fuselage; it is
far better to attach the leads neatly to, say, the fuselage side or the
chassis using adhesive tape or cable ties.
It is not permissible for modifications of any kind to be made to the
receiving system components. Avoid reversed polarity and short-
circuits of all kinds,as the electronics are not protected against such
errors.
Servo suppression filters for extension leads
If you wish to use long servo leads or extension leads,e.g.for aileron
servos installed outboard in the wings,please note that interference
may be picked up via the servo leads.Where servo cables are longer
than two normal leads (approx. 50 cm), you should at least use
twisted cables (No.F 1452).
Even better:use suppressor filters,No.F 1413.
Installing servos
Always use the rubber grommets and brass eyelets supplied when
installing servos. When you tighten the servo retaining screws,
ensure that the screws are not tightened beyond the point where
the brass eyelets make contact top and bottom; if they are
compressed,the ability of the rubber grommets to absorb vibration
would be lost.The following diagram shows two typical methods of
mounting servos.Diagram "A" shows a wooden servo plate.Diagram
"B" shows the use of a plastic or aluminium plate.
In model aircraft suitable servo plates or quick-release mounts
normally have to be fitted.In RC model cars the servos are usually
fitted in the openings provided for them in the RC installation plate.
robbe quick-release servo mounts are a good choice for model
boats. Please take great care over mounting servos, as they are
sensitive to vibration.
Servo travels
Each servo must be able to move through its full arc of travel
without being mechanically obstructed by the control surface or its
linkage.This applies in particular to the carburettor linkage.The "full
throttle" and "idle" settings must be determined by the stick
positions; never by the throttle’s mechanical end-stop.If you ignore
this warning, the servo motor will be under almost full load
constantly,and will consume an extremely high current.
1
2
3
3
4
4
1
2
5
1 Woodscrew
2 Washer
3 Rubber grommet
4 Eyelet
5 Wood
1 Nut
2 Washer
3 Rubber grommet
4 Eyelet
5 Aluminium plate
6 Screw
5
6
