User's Manual
30
Using the transmitter for the fi rst time
Preliminary notes
In theory the Graupner HoTT system permits the simul-
taneous operation of more than 200 models.
However, in practice the mixed operation of different
technical systems in the 2.4 GHz ISM band - as required
by the approval regulations - reduces this number
considerably. Generally, however, it will always be pos-
sible to operate even more models simultaneously on
the 2.4 GHz band than on the 35 / 40 MHz frequency
bands which we have used to date. However, the actual
limiting factor - as it has always been - is likely to remain
the size of the (air-) space available. The simple fact that
no frequency control procedure is necessary - a great
convenience in itself - equates to an enormous gain in
safety, especially at fl ying sites where groups of pilots
may be distributed over a large area, with nobody in
overall control.
Battery charged?
When you take receipt of your transmitter, the battery
will be in the discharged state, so you must fi rst charge
it as described on page 14. If you do not do this, the
battery will soon fall below the
pre-set threshold voltage, and
you will see and hear a warn-
ing signal to remind you to
recharge it.
Switching the transmitter on
When you switch the transmitter on, the following display
appears in the centre of the transmitter screen for about
two seconds:
RF ON/OFF?
OFF
ON
Within this period you can switch off the RF signal if re-
quired by moving the black fi eld to the right using the c
or f arrows of the right-hand four-way button; when you
do this, ON should appear normal, and OFF in inverse
f
orm (black background).
RF ON/OFF?
ON OFF
You can now switch the RF module off by pressing the
centr
al SET button of the right-hand four-way button.
Until this point the central LED glowed blue, but it now
changes to red, and at the same time the screen switch-
es to the transmitter’s base display:
GRAUBELE
#01
0:33h
stop
flt
K78
0:00
0:00
0.0V
50%
5.2V
HoTT
M
The symbol combination means that the currently
active model memory is already “bound” to a Graupner
HoTT receiver, but there is currently no connection with
this receiver. (In our example we - of course - switched
off the RF signal!)
In contrast, if you switch the transmitter on without
switching off the RF signal, the central LED glows an
intense blue, and the symbolic transmitter mast fl ashes.
At the same time the transmitter emits an audible warn-
ing until a connection is made with the corresponding
receiver. Once this connection exists, a fi eld strength
indicator appears instead of the “x” at the base of the
symbolic aerial, for example
, and the visual and
audible warnings cease.
battery
needs
charging
Using the transmitter for the fi rst time
Preliminary notes regarding the mx-12 HoTT transmitter
For more information please visit our Internet site at www.graupner.de
At the right of the same line a display in the same format
appears when a telemetry connection is made, showing
the strength of the telemetry signal picked up from the
receiver (>M
) together with the actual voltage of the
receiver power supply.
However, if the symbol combination
appears, and
the central LED glows a constant red, the currently ac-
tive model memory is not “bound” to any receiver.
Low-voltage warning
If the transmitter voltage falls below a particular value,
a visual and audible low-voltage warning is generated.
The default value is 4.7 V, but this can be varied in the
“Basic Settings” menu (page 114).
Firmware update
Firmware updates for the transmitter are carried out at
the owner’s discretion using the three-pin PC interface
on the back of the transmitter, in conjunction with a PC
running Windows XP, Vista or 7. It is essential to check
the state of charge of the transmitter battery before
any update; recharge it to be on the safe side, and
be sure to back up all stored model memories be-
fore carrying out the update, so that you can restore
the data if necessary.
To connect the transmitter to a PC you also require the
optional USB adapter, Order No. 7168.6 and the con-
necting lead, Order No. 6466.S.
The latest software and information can be found in the
Download section for the corresponding product at www.
graupner.de.
Note:
Once you have registered your transmitter at http://
graupner.de/de/service/produktregistrierung you will
automatically be informed of new updates by e-mail as
33112_mx12_HoTT_2_GB.indd Abs9:3033112_mx12_HoTT_2_GB.indd Abs9:30 06.06.2011 19:39:3406.06.2011 19:39:34