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1.2 general notes
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The receiver's integral gyros are very fast, high-resolution components. This means that you
should always use high-speed digital servos wherever possible, so that the gyro's corrective
signals are converted directly and accurately into servo movement; this helps to prevent the
model oscillating.
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Keep all servo extension leads as short as possible.
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When switching on or adjusting the radio control system, it is essential to keep the transmitter
aerial at least 15 cm from the receiver aerial(s). If the transmitter aerial is too close to the receiver
aerials, the receiver will be swamped and the red LED on the receiver will light up. The transmitter
responds with a flashing red LED and repeated beeps at approximately one-second intervals, i.e.
the radio control system reverts to fail-safe mode. If this should happen, increase the distance
until the audible warning ceases, and the blue transmitter LED lights up constantly once more.
The red LED on the receiver should now be off.
2. Functions
2.1. 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:
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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.
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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:
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Switch the transmitter's RF section off in the "Basic model settings" menu.
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Switch the receiver on, and press the SET button to set it to Bind mode.
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Initiate binding in the transmitter's "Basic model settings" menu.
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If the receiver's red LED moved within about 10 seconds to green, the Binding Operation was
completed successfully.
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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
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happen, repeat the whole procedure.
2.1.1. 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.
2.2. 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.
Manual Receiver GR-24PRO 3xG+3A+3M+Vario Graupner HoTT 2. 4
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