48
Commissioning the transmitter
Preliminary remarks
The Graupner HoTT system theoretically permits simul-
taneous operation of more than 200 models. However,
because of the interspersed radio-frequency utilization
permitted by certifi cation for the 2.4 GHz ISM band,
this number is signifi cantly lower in practical applica-
tion. The real limiting factor is – as often before – still
likely to be the size of available operating space (i. e.
airspace for aircraft). Alone the fact that it is no longer
necessary to coordinate transmitting frequencies with
other pilots in the vicinity (which is sometimes quite dif-
fi 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 18.
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 270, is underrun.
Transmitter startup
From fi rmware version V 1.090 “Motor on C1 forward
/ back” is after switching the station when a surface
model of the type analyzed the position of the output
to 1 or when the Helimodell connected to the output 6
throttle servo.
Should the respective servo be outside the idling range
thus is a risk of a high-speed motor, for safety reasons
the RF module remains switched off.
In all other cases, the RF module is activated with the
Batt. must
be re-
charged!!
switch on the transmitter and appear in the centre of
the transmitter displays appears:
Please select
RF on/off?
ON OFF
You can now either wait until the display after a few
seconds automatically disappears, or manually shorten
the waiting time by tapping the centre SET key of the
right four-way button.
Within this brief period there is an opportunity to switch
RF transmission off by using the or key of the
right four-way button 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 inverse:
Please select
RF on/off?
ON OFF
Now switch the RF module off by tapping on the centre
SET key of the right four-way button.
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:
mc20
Commissioning the transmitter
Preliminary remarks about the mc-16 HoTT and mc-20 HoTT transmitters
GRAUBELE
#01
0:00h
Stp
Flt
«normal »
K78
0:00
0:00
0.0V
4.1V
Mx
HoTT
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, RFtrans-
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 re-
spective 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
ap-
pears 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
270, 3.60 V by default, there will be visual and acous-
tic under-voltage warnings issued.
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