User's Manual
2.2. Range checking
The method of checking the effective range of the Graupner HoTT 2.4 GHz system is described below.
We recommend that you ask a friend to help you with this procedure.
After binding the receiver to your transmitter, switch the transmitter and the receiver on, and wait until
the green LED on the receiver lights up.
• Install the bound receiver in the model in its fi nal intended position.
• Switch the RC system on, so that you can observe the movement of the servos.
• Set up the model on a fl at surface (pavement, closely mown grass or earth), and ensure that the
receiver aerials are located at least fi fteen cm above the ground. This may require a support for the
model.
• Hold the transmitter at hip-height, away from your body, but do not point the aerial directly at the
model; instead turn and / or angle the aerial tip so that it stands vertical, and keep it there for the
duration of the range check.
• Locate the BIND / RANGE button on the back of the transmitter, and press it to initiate range-check
mode. Hold the button pressed in until the transmitter starts to beep at a regular rhythm; the red and
green LEDs adjacent to the BIND / RANGE button now fl ash alternately.
• Walk away from the model, operating the transmitter sticks constantly. If you detect an interruption
in the link within a range of about fi fty metres, stand still and attempt to reproduce it.
• If the model is fi tted with a motor, switch it on in order to check whether the power system is gene-
rating interference.
• Continue to walk away from the model until you reach the point where perfect control is no longer
possible.
• Now press the BIND / RANGE button on the transmitter once more; this terminates range-check
mode manually, and the model should respond normally to control commands. If this does not occur
with 100% reliability, the system should not be used. Contact your local Service Department of
Graupner GmbH & Co. KG.
• Range-check mode is usually terminated manually when the user presses the BIND / RANGE but
ton, but it terminates automatically after about ninety seconds in any case. The red LED now glows
constantly again, while the green LED either glows constantly or fl ashes continuously, according to
the Country setting.
• We recommend that you check effective radio range before every fl ight. While you are carrying
out the check, simulate all the servo movements which will take place when the model is in fl ight.
The ground range must always be at least fi fty metres in order to ensure safe, reliable model con-
trol.
Note:
Range-check mode is usually terminated manually when the user presses the BIND / RANGE button,
but it terminates automatically after about ninety seconds in any case.
CAUTION:
During normal operations (i. e. when controlling a model) never press and hold the programming
button on the transmitter module!
2.3. Fail-Safe function
In its default state (as delivered) the receiver is set to “Hold” mode, i.e. if a fail-safe situation occurs, all
the servos connected to it maintain the last position detected as valid. In this mode the red LED on the
receiver lights up when interference occurs, and the red LED on the transmitter goes out. The transmit-
ter also starts beeping about once per second as an audible warning.
You can exploit the safety potential of the fail-safe option by at least programming the throttle channel to
respond to a fail-safe situation: the throttle channel of an engine-powered model should be set to idle,
the throttle channel of an electric-powered model to “stop”, and the throttle channel of a model helicopter
to “Hold”. If interference should occur, these settings will help prevent the model fl ying out of control,
possibly causing personal injury or property damage.
IMPORTANT:
The two functions “Binding” and “Range check” described above can be used regardless of the method
you last employed to program the transmitter, i.e. using the programming button or the SMART-BOX;
neither of these two options causes signifi cant changes to the settings saved in the receiver. However,
02 Getting Started Graupner HoTT 2.4
ACCESSORIES:
Getting Started Graupner HoTT 2.4 03
Order No. 33611 General Air-Module Graupner HoTT
Vario, RPM, Fuel, 2x temperature, 2x
voltage, max. current 40A, capacity,
single cell voltage 2 -6 S
Order No. 33615
Order No. 33613 Graupner HoTT Temperature Sensor
200°C, voltage sensor
Graupner HoTT RPM Optical Sensor
Order No. 33700 HoTT SMART BOX
Order No. 33612 Graupner HoTT Temperature Sensor
120°C, voltage sensor