SERVO display under the menu point ‘PERIOD’.
SAME:
the receiver outputs are transmitted in parallel blocks of four, i.e. channels 1 to 4 and channels
5 to 8 receive the transmitter signal simultaneously in each case: recommended for digital servos. It is
particularly useful where multiple servos are used for a particular function (e.g. ailerons), so that all the
servos move absolutely synchronously.
It is also possible to connect analogue servos; in this case you
must
set 20 ms in the menu point ‘PE-
RIOD’ in the RX SERVO display.
Note: if you select the SAME setting, it is especially important to install a high-capacity receiver power
supply system, as up to four servos are almost always working simultaneously, placing a greater load
on the battery.
SUMI (Sum signal Input):
Input for satellite receiver
SUMO (Sum signal output):
the receiver outputs are transmitted in sequence, whereby the highest
channel transmits the sum signal; this signal is required by certain optional devices. With this setting the
servos are automatically operated using a 20 msec cycle - 30 msec in the case of the twelve-channel
receiver (Order No. 33512) - regardless of the value set and shown in the menu point ‘PERIOD’ of the
RX SERVO display.
Ex: V-Stabiliser, teacher-student system, Microbeast,
fl
ight simulator and output satellite receiver
SATELLITE MODE
Two HoTT receivers are inter-connected using a three-core connecting lead (Order No. 33700.1 (300
mm) or 33700.2 (100 mm) by the highest-numbered servo sockets. For more details on this please visit
www.graupner.de on the Internet.
The HoTT receiver which is con
fi
gured as SUMO (see below) is designated the satellite receiver, and
all its channels are transmitted in the form of a sum signal to the second HoTT receiver - the primary
receiver - if reception should fail; the primary receiver must be programmed as “SUMI”. Note that the
signal only ever moves towards SUMI.
The receiver outputs are addressed in sequence at a frame rate of 20 ms (30 ms with the GR-24 re-
ceiver, Order No. 33512), even if you have set 10 ms in the “PERIOD” line of the “RX SERVO” screen
page. However, if the receiver programmed as the satellite (SUMO) suffers signal reception failure, the
servos connected to that receiver take up the Fail-Safe positions programmed in the satellite receiver,
regardless of the primary receiver.
This receiver con
fi
guration is recommended in particular circumstances: for example, if one of the two
receivers has to be installed in an unfavourable position in the model, or if there is a danger that the
received signal will be weak in certain
fl
ight attitudes, perhaps due to a turbine, carbon
fi
bre in the
airframe, or a similar problem, with the result that sporadic range problems might be expected.
For this reason it is essential to connect the most important control functions to the primary receiver (the
one programmed as SUMI), so that interference to the satellite receiver (SUMO) does not cause the
model to go out of control. Telemetry data, such as the voltage of the airborne power supply, are only
sent to the transmitter by the satellite receiver (con
fi
gured as SUMO), i.e. all telemetry sensors must be
connected to the satellite receiver (SUMO).
Each receiver should be connected to the shared power supply using its own power lead. If high cur-
rents can be expected, duplicated power connections are recommended. However, if each of the two
receivers is to be powered by its own battery, then it is essential to withdraw the central (red) wire from
one of the two satellite lead connectors.
If you wish to carry out further programming, such as the Fail-Safe settings, disconnect the three-core
satellite connection between the two receivers, and switch on just the receiver you wish to address. Note
that you may also need to change the binding sequence.
Manual Module M-G2 33302
14
