Installation Notices - GRAUPNER MC-20 HoTT Programming Manual

Installation notices

Receiver installation
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.
52
Installation notices
Several notices and suggestions for installing
remote control components into a model are
provided below.
1. Wrap the receiver in a foam rubber pad that is at
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.
2. All switches must be installed such that they are
not affected by exhaust gases or vibration. The
switch knob must be freely accessible over its
entire range of movement.
3. Mount servos on rubber bushes/spacers with
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
4. Servo arms must be free to move throughout their
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.
In order to prevent uncontrolled movements of servos
connected to the receiver during startup
always fi rst switch on the transmitter
and then the receiver
and when fi nished with operation
fi rst switch off the receiver
and then the transmitter.
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.