Handleiding Robbe Futaba FX-40 (pagina 100 van 105) (Engels)

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Tips and notes

FX-40

The following solution has proved highly effective in practice:

Mount the aerial on a hardwood former inside the fuselage,

nd run it through a hole of around 10 mm Ø in the fuselage.

Insulate the aerial where it exits the fuselage with a piece of

heat-shrink sleeving.

20.3 INST

ALLING THE RECEIVER

•

When positioning the receiver, please apply the principles

as described above.

• Wher

ever possible, do not position any other electronic

components in the immediate vicinity of the receiver.

• The usual practice of ‘stacking electronic units on top of

one another’ should be avoided as far as possible.

• We strongly recommend the use of low-resistance NC or

NiMH batteries as the receiver power supply.

• Avoid using pulsed BEC systems as the receiver power

supply; these “frequency generators” produce a powerful,

constantly changing frequency spectrum, which is then

passed directly to the receiver via the connecting lead. As

the load and voltage of these systems are constantly fluctu-

ating, they often do not constitute an adequate receiver

power supply. The current drain of synthesizer receivers is

generally high, and they are affected particularly badly by

this problem.

• Speed controllers for relatively high cell-count batteries

usually do not feature a BEC system for the receiver power

supply, but still incorporate an “internal” BEC system for

powering the speed controller electronics, and this opera-

tes on the same principle; it just works at lower power.

Once again the receiver connection is the direct route from

the power source to the receiver. We recommend using a

suppressor filter, No. F 1413, to keep this form of interfe-

rence away from the receiver. Some other filters only feature

a ferrite ring, but the Futaba suppressor unit also filters the

input signal using a capacitor / resistor combination.

• Different receiver types (FM, PCM 1024, PCM 2048 (G3))

also tend to respond unpredictably when connected to

auxiliary electronic modules such as glowplug energizers,

turbine control units, telemetry systems, GPS, etc. If you

experience problems, once again we recommend that you

try using the suppressor filter, No. F 1413, as a de-coupling

measure.

20.4 PRECAUTIONS IN THE MODEL

To avoid the build-up of static charges in your model, please

take the following measur

es:

•

Helicopters:

• Connect the tail boom to the chassis using an earthing

strap. If your model features a toothed belt tail rotor drive,

attach a “copper brush” in or

der to dissipate the char

ged

energy from the toothed belt. You may also find it necessary

to connect the toothed belt pulleys to the chassis using an

electrically conductive link.

• In most electric helicopters it is necessary to connect the

tail boom electrically to the motor case.

• If your model helicopter features CFRP / GRP blades and a

carbon fibre tail boom, massive static charges may be

generated at high rotor speeds, especially in atmospheric

conditions of low humidity. To avoid this, the tail rotor gear-

box should be connected electrically right through to the

main rotor shaft. The use of anti-static sprays (e.g. Kontakt

Chemi) has also proved effective.

• Turbines:

• Connect the turbine shield plate using an earth strap to

avoid the build-up of static charges.

• Always fit a separate suppressor filter, No. F 1413, to the

turbine ECU.

• Fast-flying models made of GRP are particularly suscepti-

ble to the build-up of static charges (approx. 40,000 Volts)

due to high airspeeds - especially when aerial humidity is

low. On such models all GRP components with an area lar-

ger than about 10 cmÇ should be inter-connected using a

conductive link.

• Any other connections mounted on the outside of the fuse-

lage (e.g. fuel filler nipples etc.) should also be connected to

each other using conductive materials, to avoid static char-

ges. Such charges can cause fuel cut-off valves to be trig-

gered via the fuel line.

• Undercarriage wheels can also provoke static charge pro-

blems, and should therefore be fitted with copper brushes.

20.5 SERVO LEADS

When deploying servo leads, please ensure that they are not

under any mechanical strain and ar

e 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 insu-

lation. All connectors must be firmly fitted and secure. When

disconnecting servo plugs, pull on the plastic housings - not

on the wires.

Servo leads should not just be left trailing loosely inside the

fuselage; it is far better to attach them neatly to, say, the fuse-

lage side or the chassis using adhesive tape or cable ties. It is

not permissible for modifications of any nature 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.

20.6 SERVO SUPPRESSOR FIL

TERS

If you wish to use long servo leads or extension leads, please

note that interfer

ence may be picked up via the servo leads.

Where servo cables ar

e 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.

20.7 ELECTRIC MOTORS

All conventional electric

motors in RC models must

be ef

fectively suppr

essed,

otherwise the sparks which

are generated between the

armature and the carbon

brushes when the motor is

running will have a serious

adverse effect on the radio

control system, and cause

interference. We recom-

mend robbe suppressor filters, No. 8306, 8307 or a set of sup-

pressor capacitors, No. 4008. Each electric motor in the model

must be suppressed individually as shown in the diagram.

If your model features brushless motors and speed controllers,

these should be connected to the receiver via a suppressor fil-

ter, F 1413.

20.8 ELECTRONIC IGNITION SYSTEMS

The ignition systems of spark-ignition petrol engines can also

generate interference, which has an adverse effect on the

47 nF

100 nF

Electric

motor

Connec-

tions

100 nF

Robbe Futaba FX-40 Handleiding

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