Graupner Hendheld RC 2.4 GHz No. of channels: 12 33124 Data Sheet

38

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. 

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 

 option is highlighted in reverse video.

RF on/off?

ON

Please select

OFF

Now switch the RF module off by tapping on the center 

 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

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

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.