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48 Commissioning the transmitter
Preliminary remarks
The Graupner HoTT system theoretically permits
simultaneous operation of more than 200 models.
However, because of the interspersed radio-frequen-
cy utilization permitted by certifi cation for the 2.4 GHz
ISM band, this number is signifi cantly lower in practi-
cal application. Nevertheless, in general more models
can be operated simultaneously in the 2.4 GHz band
than would be the case in conventional 35 or 40 MHz
frequency bands. The real limiting factor is as often
before is still likely to be the size of available oper-
ating space (i. e. airspace for aircraft). Alone the fact
that it is no longer necessary to coordinate transmit-
ting frequencies with other pilots in the vicinity (which
is sometimes quite diffi cult in broken landscapes,
such as on hillside slopes) represents an enormous
boost for remote control operating security.
Battery charged?
Since the transmitter is delivered with an empty (not
charged) battery, the battery must fi rst be charged
according to the charging instructions on page 16.
Otherwise a warning tone will be sounded and an
appropriate message will be blended into the basic
display if the low voltage threshold set in the "Battery
warning" line of the »General basic settings« menu
(see page 260) is underrun.
Transmitter startup
From fi rmware version V 1.090 “Motor on C1 forward /
back” is after switching the transmitter when a surface
model of the type analysed the position of the output
to 1 or when the heli model is connected to the output
6 throttle servo.
Should the respective servo be outside the idling
range thus can be a risk of a high-speed motor, for
safety reasons the RF module remains switched off.
After being switched on, the message shown below
will appear in the transmitter's screen for about two
seconds.
OFFON
Please select
RF on/off?
You can now either wait until the display after a few
seconds automatically disappears, or manually short-
en the waiting time by tapping the centre SET key of
the right touch pad.Within this brief period there is an
opportunity to switch RF transmission off by using the
or key of the right touch pad to shift the position
of the fi eld shown in inverse video to the right so that
ON is in standard video and OFF is presented in in-
verse video.
ON
Please select
RF on/off?
OFF
Now switch the RF module off by tapping on the
centre SET key of the right touch pad. The meantime
glowing green “RF” LED to the right of the switch
turns off. Then you are in the basic display of the
transmitter and the front display the Graupner logo
and type designation of the sender is displayed:
mc32
Transmitter startup
Batt. must
be re-
charged!!
Commissioning the transmitter
Preliminary remarks about the mc-32 HoTT transmitter
… and in parallel to this, the transmitter's basic dis-
play will appear similar to that shown below:
#01 0:00h
Stop watch
Flight tim
K78
0:00.0
4.1V
0:00.0
00
0
0
00:00h
M
V
The symbol combination means that the currently
active model memory has already "bounded " with a
Graupner-HoTT receiver but there is no connection to
that receiver at the moment. (In this example, RF trans-
mission has been switched off.)
If, however, the transmitter is switched on without
switching RF transmission off, the symbolic antenna
mast will blink. At the same time, an acoustic warning
will sound until a connection is established with the
respective receiver. As soon as the connection is estab-
lished, the "X" at the base of the symbolic antenna will
be replace with a fi eld strength indicator, for example
, and the visual and acoustic warnings will cease.
If a telemetry connection has also been established
for the incoming signal, that is output by the receiver
in the model, then the right side of this same screen
line will display a similar indication of signal strength
for this reception of the receiver's transmitted signal
(M ) as well as the current voltage of the receiver's
power supply.
On the other hand, if the symbol combination
appears in the display and the front display shows
the message "Can't receive data" then the currently
active model memory is not "bound" to any receiver
at the moment.
Under-voltage warning
If the transmitter's voltage drops below a certain value
set in the »General basic settings« menu (page
48


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