Binding; Range-Checking - GRAUPNER GR-18 Notice D'utilisation

Binding

The Graupner/SJ HoTT 2.4 receiver must be "bound" to "its" Graupner/SJ HoTT 2.4 RF module (transmitter) before a
radio link can be created between them; this process is known as "binding". Binding is only necessary once for each
combination of receiver / RF module, so the binding procedure described below only needs to be repeated if you add
more receivers. However, binding can be repeated at any time if you wish; for example, if you switch transmitters. This
is the procedure in detail:
• Binding is only possible if the receiver has not been linked with a bound transmitter since being switched on (red
LED lights); press the SET button to set the receiver to BIND mode.
• If you have already bound a receiver to the transmitter, and wish to bind the receiver to a new model memory, this
is the procedure:
• Switch the transmitter's RF section off in the "Basic model settings" menu.
• Switch the receiver on, and press the SET button to set it to Bind mode.
• Initiate binding in the transmitter's "Basic model settings" menu.
• If the receiver's red LED moved within about 10 seconds to green, the Binding Operation was completed successfully.
• Your transmitter / receiver combination is now ready for use.
• However, if the red LED continues to glow, then the binding process has failed. If this should happen, repeat the
whole procedure.
Binding multiple receivers per model
If necessary it is also possible to bind more than one receiver to a particular model. First bind each receiver individually
as described earlier.
When the system is actually in use, the receiver which was last bound acts as the Master unit, and any telemetry
sensors installed in the model must be connected to this receiver, as only the Master receiver transmits the data to
the ground using the downlink channel. The second - and any other - receivers operate in Slave mode, in parallel with
the Master receiver, with the downlink channel switched off. The channel mapping function of HoTT telemetry also
allows the control functions to be divided up amongst multiple receivers, or alternatively the same control function to
be assigned to multiple receiver outputs. For example, this is useful if you wish to actuate each aileron with two servos
instead of just one.
Fail-Safe function
In the receiver's default state, all connected servos remain in their last valid position ("Hold" mode) if a fail-safe situation
should arise. In fail-safe mode the red LED on the receiver lights up, and the transmitter generates an audible alert by
beeping at a rate of around one per second.
You can exploit the safety potential of this option by at least setting the throttle position (for internal-combustion powered
models) to Idle, or the motor function (electric-powered models) to "Stop", or "Hold" for a model helicopter, if a fail-safe
event should occur. These settings ensure that the model is less likely to fly out of control if interference should occur,
thereby helping to avoid property damage or even personal injury.
Read the operating instructions supplied with your radio control system for more details.
The gyro system remains active in a fail-safe situation.

Range-checking

• The range of your Graupner/SJ HoTT 2.4 system can be checked as described in the following instructions. We
recommend that you ask a friend to help you with the procedure.
• Ideally the receiver should already be bound to the transmitter. Install it in the model in its final position.
• Switch the radio control system on, and wait until the red LED on the receiver goes out. The servo movements can
now be observed.
• Place the model on a flat surface (pavement, close-mown grass, earth), and ensure that the receiver aerials are at
least 15 cm above the ground. It may be necessary to pack up the model to achieve this for the period of the range-
check.
• Hold the transmitter away from your body at hip-level. Don't point the transmitter aerial straight at the model; instead
rotate or angle the aerial tip in such a way that it is vertical when you operate the transmitter controls.
• Select range-check mode, as described in the transmitter instructions.
• Walk away from the model, moving the transmitter sticks. If you detect an interruption in the radio link at any time
within a distance of about 50 m, see if you can reproduce the problem.
• If your model is fitted with a motor or engine, switch it on or start it, so that you can check effective range when
potential interference is present.
• Walk further away from the model to the point where full control is no longer possible.
• At this point you should manually switch off range-check mode.
• The model should now respond to the controls again. If this is not 100% the case, do not use the system. Contact
the Graupner/SJ Service Centre in your locality and ask their advice.
• We recommend that you carry out a range-check before every flight, simulating all the servo movements which
occur in flight. To guarantee reliable model operation, radio range must always be at least 50 m on the ground.
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