Graupner GmbH & Co. KG MC-20 用户手册

52

In order to prevent uncontrolled movements of servos 
connected to the receiver during startup

and when fi nished with operation 

When programming the transmitter, be sure that 
electric motors cannot start running without control 
or that a combustion motor equipped with automatic 
starting cannot start up unintentionally. To be safe, 
disconnect the receiver's drive battery or, in the case 
of a combustion motor, disconnect the fuel supply.

Wrap the receiver in a foam rubber pad that is at 

1. 

least 6 mm thick. Attach the foam rubber to the 
receiver with rubber bands so it will be protected 
against vibration and/or the jars of a hard landing. 
All switches must be installed such that they are 

2. 

not affected by exhaust gases or vibration. The 
switch knob must be freely accessible over its 
entire range of movement.
Mount servos on rubber bushes/spacers with 

3. 

hollow brass bearings to protect them from 
vibration. Do not tighten the fastening screws 
down too tight as this would negate the vibration 
protection to be provided by the rubber bush/
spacer. Only when servo fastening screws are 
properly tightened will this arrangement provide 
security and vibration protection for your servos. 
The fi gure below shows how a servo is mounted 
properly. The brass bearings are to be pushed into 
the rubber bushes/spacers from below.

Servo mounting lug

Retaining screw

Rubber grommet

Tubular brass spacer

Servo arms must be free to move throughout their 

4. 

entire range of motion. Pay attention that there are 
no objects which could hinder servo arm motion.

The sequence in which servos are connected to the 
receiver depends on the type of model. Follow the 
connection layouts provided for this on pages 61 and 65.
Also observe the safety notices provided on pages 4 … 9.

Regardless of which Graupner receiver system you 
use, the procedure is always the same.
Please pay attention that the receiver's antennas 
must be mounted at least 5 cm away from all large 
metal parts or any wiring that is not directly routed 
out of the receiver itself. In addition to steel parts, this 
also includes carbon fi ber parts, servos, fuel pumps 
and all kinds of cables etc. Optimally the receiver 
should be placed at a readily accessible location 
that is well away from all other equipment. Under no 
circumstances may servo cables be wrapped around 
the antennas or routed close to it.
Please note that cables are subject to the 
acceleration forces which occur during fl ight and 
these forces may cause such cables, to shift in 
position. Therefore be sure the cables in the vicinity 
of the antennas are not able to move. Such moving 
cables can cause reception disturbances.
Tests have shown that vertical (upright) antennas 
provide the best results during wide-range fl ights. In 
the case of diversity antennas (two antennas), the 
second antenna should be oriented at a 90° angle to 
the fi rst antenna.
The connectors designated "B + -" on the GR-
32 DUAL HoTT receiver are intended for battery 
connections. The power supply is bussed across 
all numbered connections so it can be attached 
at any of these 16 connectors. However, due to 
additional voltage losses associated with the traverse 
connectors, connections 13 through 16 should not be 
used for connecting the receiver's battery.
The function of every individual channel is determined 
by the transmitter used, not by the receiver. However, 
channel assignments can be changed in the receiver 
by programming done in the »Telemetry« menu. 
Nevertheless, it is recommended this be done on the 
transmitter side via the "Transmitter output" option, 
see page 218.