GRAUPNER mx-20 Hott, Programming Manual

Page: 38 / 296

38 Putting the transmitter into operation
Preliminary remarks
Graupner's HoTT system theoretically permits
simultaneous 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
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
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 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 14.
Otherwise a warning tone will be sounded when the
low voltage threshold, preset in the "Batterie warning"
line of the "
Basic Settings ",
is underrun. This low voltage
threshold can be set, as
described on page 226. When
this threshold is underrun,
a warning tone will be sounded and an appropriate
message will be overlaid on the base screen.
Transmitter startup
After being switched on, the message shown below will
appear in the transmitter's screen for about two seconds.
RF on/off?
OFF ON
Please select
Within this brief period you may be able to switch off RF
transmission by using the

or

key of the right touch
pad to shift the query's response from "ON" to "OFF"
such that the
ON option is displayed in normal video and
the OFF option is highlighted in reverse video.
RF on/off?
ON
Please select
OFF
Now switch the RF module off by tapping on the center
SET key in the right key pad.
The center LED, which in the meantime has been
illuminating in blue, will change its color to red again and
the transmitter's display will show the screen depicted
below.
GRAUBELE
#01
0:33h
Stop
Flt
K78
0:00
0:00
0.0V
5.2V
M
HoTT
The symbol combination means that the currently
active model memory has already "bonded
" with a
Graupner HoTT receiver in the past but there is no
connection to this receiver at the moment. (In this
example, RF transmission has been switched off.)
If the transmitter were to be switched on
without
switching off RF transmission, the center LED would
illuminate in blue and the symbolic transmitter antenna
b a t t e r y
n e e d s
c h a r g i n g
Putting the transmitter into operation
Preliminary remarks about the
mx-20
HoTT transmitter
in the screen would blink. At the same time, an acoustic
warning will sound until a connection is established with
the respective receiver. As soon as this connection is
established, the "x" at the base of the antenna symbol
will be replaced by a fi eld strength indicator, for example
, and the optical and acoustic warnings will stop.
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 screen displays the symbol
combination
and the center LED illuminates in red
continuously then the currently active model memory is
not "bonded" to any receiver.
Under-voltage warning
If transmitter voltage drops below the adjustable
threshold specifi ed in the "
General Settings " menu,
see page 226 (default value, 4.7 V), an optical and an
acoustic under-voltage warning will be issued.
Important notices:
The transmitter in the set is already preset, as •
delivered, with default values which are correct
for operation in most European countries (except
France).
If the remote control system is to be operated in
France then the transmitter MUST be changed over
to "FRANCE" mode, see page 227. IN NO CASE may
the Universal/EUROPE mode be used IN FRANCE.
The receiver included in the set
• with the
mx-20
HoTT 2.4 transmitter (and already bound to the
transmitter by settings made in the factory) is