Graupner GmbH & Co. KG MC-20 Manual De Usuario

6

Capacity and operating time
The rule: "capacity is reduced with every successive 
recharging", applies to all batteries. Internal resistance 
increases at low temperatures to further reduce 
capacity. As a consequence, the battery's ability to 
provide current and hold its voltage is reduced.

Frequent charging or the use of battery maintenance 
programs can also result in gradual loss of battery 
capacity. Therefore the capacity of batteries should 
be checked at regular intervals, not in excess of 
every six months, and replaced if performance is 
found to be signifi cantly defi cient.
Purchase only genuine Graupner batteries!

Interference suppression for electric motors
All conventional electric motors produce sparks 
between their collector and brushes. Depending on 
the type of motor involved, this may cause more or 
less interference with the functionality of the remote 
control system.
The electric motors of a properly built system should 
therefore have interference suppression features. 
For electric drive models it is particularly important 
that every one of its motors is provided with proper 
interference suppression. Interference fi lters 
extensively suppress such disturbances and should 
always be included. 
Follow the respective recommendations included in 
the motor's operating and installation notices.
For further details about interference fi lters, refer to 
the Graupner RC main catalog or in Internet at 
www.graupner.de.

Servo interference fi lters for extension cables
Order no. 1040
The servo interference fi lter is necessary when an 
extended-length servo cable is used. This fi lter is 
attached directly to the receiver output. In critical 
cases a second fi lter can be attached to the servo. 

Using electronic speed controllers
Choosing the right electronic controller is largely a 
matter of matching controller performance to the 
motor to be controlled.
In order to prevent an overload or damage to the 
speed controller, its current rating should be at least 

half of the maximum locked-rotor current draw of the 
motor to which it is connected.
Particular attention is appropriate for so-called "tuning 
motors". Because of their low-turns coils these 
motors can draw a multiple of their rated current 
in a locked-rotor condition and this can lead to the 
destruction of the speed controller.

Electric ignition systems
Combustion motor ignition systems also produce 
interference that can negatively infl uence remote 
control functionality.
Always supply power to an electric ignition system 
from a separate, dedicated battery.
Use only interference-suppressed spark plugs, spark 
caps and shielded ignition leads.
Mount the receiver suffi ciently far away from ignition 
system components.

Static charges
A remote control system will be destroyed by the 
magnetic shock waves produced by a lightning strike 
- even if the storm is miles away. Therefore …
… stop fl ying right away if a storm is approaching. 
Static charging via the antenna also represents a 
lethal hazard.

In order to fulfi ll FCC HF emission requirements 

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for mobile transmitters, a distance of at least 
20 cm must be maintained between this system's 
antenna and other persons when this system is 
operating. Operation of this system at a lesser 
distance is therefore not recommended. 
To avoid disturbance caused by the electrical 

•

characteristics and emissions of other transmitters, 
keep at least a 20 cm distance from other 
transmitters.
Operation of the remote control system requires a 

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correct program setting for the given country in the