User manual

46
Commissioning the transmitter
Preliminary remarks
The Graupner/SJ HoTT system theoretically permits
simultaneous operation of more than 200 models.
However, because of the interspersed radio-frequen-
cy utilization permitted by certification for the 2.4 GHz
ISM band, this number is significantly 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 – 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 difficult 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 first be charged
according to the charging instructions on page 16.
Otherwise a warning tone will be sounded and an ap-
propriate message will be blended
into the basic display if the low
voltage threshold set in the “Bat-
tery warning” line of the »General
basic settings« menu, see page
272, is underrun.
Transmitter startup
After being switched on, the message shown below
will appear in the transmitter’s screen for about two
seconds.
Please select
RF on/off?
ON OFF
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
field shown in inverse video to the right so that ON
is in standard video and OFF is presented in inverse
video:
Please select
RF on/off?
ON OFF
Now switch the RF module off by tapping on the
center SET key of the right four-way button.
The telemetry display just below the antenna socket
will then briefly show the message …
CAN‘T
RECEIVE
DATA
OK
… and in parallel to this, the transmitter’s basic dis-
play will appear similar to that shown below:
#01
0:00h
Stp
Flt
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/SJ-HoTT receiver but there is no connec-
tion to that receiver at the moment. (In this example,
Commissioning the transmitter
Preliminary remarks about the mc-16 HoTT and mc-20 HoTT transmitters
RF transmission 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 warn-
ing will sound until a connection is established with
the respective receiver. As soon as the connection is
established, the “X” at the base of the symbolic an-
tenna will be replace with a field 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 ac-
tive 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 272, 3.60 V by default, there will be visual and
acoustic under-voltage warnings 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 (ex-
cept France).
If the remote control system is to be operat-
ed in France then the transmitter’s “Region”
setting MUST be changed over to “FRANCE”
mode, see page 272. IN NO CASE may the
Universal/EUROPE mode be used IN FRANCE.
• Up to eight servos can be operated with the
Batt. must
be re-
charged!!