User's Manual

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100

Using the receiver for the ﬁ rst time

Preliminary notes regarding the GR-12 receiver

Receiving system

The mx-10 HoTT radio control set includes a GR-12

2.4 GHz bi-directional receiver which is suitable for

connection to a maximum of six servos.

In order to create a connection to the transmitter, the

Graupner HoTT receiver must ﬁ rst be “bound” to “its”

model memory in “its” Graupner HoTT transmitter; this

procedure is known as “binding”. However, binding is

only necessary once for each receiver / model memory

combination (see pages 106 or 109), and has already

been carried out at the factory using the components

supplied in the set. You therefore only need to carry out

the “binding” process with additional receivers, or if you

switch to a different model memory. The procedure can

also be repeated whenever you wish - for instance, if

you change the transmitter.

For this reason, if you connect the GR-12 HoTT receiver

supplied in the set to a power supply and switch it on,

the integral LED brieﬂ y lights up green, and then goes

out again, assuming that “its” transmitter is not in range,

or is switched off. If a connection is made, the LED

glows a constant green.

Note:

If the LED glows a constant green, but the receiver

responds neither to the SET button nor to control com-

mands, then please check the polarity of your receiver

power supply.

Receiver voltage display

Once a telemetry connection exists, the actual voltage

of the receiver power supply is displayed on the right-

hand side of the transmitter screen.

Temperature warning

If the temperature of the receiver falls below a limit value

set on the receiver (the default is -10°C), or exceeds

the upper warning threshold, which is also set on the

receiver (the default is +70°C), the transmitter generates

a warning in the form of steady beeps at intervals of

about one second.

Servo connections and polarity

The ser

vo sockets of Graupner HoTT receivers are

numbered. The connector system is polarised: look for

the small chamfers when inserting the connectors, and

on no account force the plugs into the sockets.

The power supply is through-connected via all the num-

bered sockets. If there is no vacant servo socket, it is

also possible to connect the power supply via a Y-lead,

Order No. 3936.11, in parallel with a servo.

Do not connect the battery to these sockets with

reversed polarity, as this is likely to ruin the receiver

and any devices connected to it.

The function of each individual channel is determined by

the transmitter you are using, rather than by the receiver.

The throttle servo socket is deﬁ ned by the radio control

system, and may differ according to the make and type.

For example, in the case of Graupner radio control

systems the throttle function is assigned to channel 1 for

ﬁ xed-wing models, and channel 6 for helicopters.

Servo socket 5: “SERVO” or “SENSOR”

The servo socket 5, which is marked with an additional

“T” …

Servo

sensor

… can be used not only to update the receiver by con-

necting the adapter lead, Order No. 7168.6A, but also to

connect a telemetry sensor.

However, to ensure that the receiver correctly detects

the device connected to this socket, servo socket 5

MUST be reset from “SERVO” to “SENSOR” and vice

versa to suit the device. This is carried out in the “Te-

lemetry” menu on the “RX CURVE” page of the “SET-

TING & DATA VIEW” sub-menu. See the section starting

on page 120

for more details:

RX CURVE

TYPE : A

CURVE1 CH : 02

TYPE : A

CURVE2 CH : 05

TYPE : B

CURVE3 CH : 04

5CH FUNCTION:SERVO

On this menu page locate the “>” symbol at the left-hand

edge of the screen, use the INC or DEC button to move

it to the bottom line, and then press the INC+DEC button

simultanously:

RX CURVE

TYPE : A

CURVE1 CH : 02

TYPE : A

CURVE2 CH : 05

TYPE : B

CURVE3 CH : 04

5CH FUNCTION:SERVO

Now select the alternative “SENSOR” setting using one

of the INC or DEC buttons:

117

Program description: Telemetry menu

(control surface travel) for the servo connected to the

control channel selected in the “OUTPUT CH” line. The

value is set separately for each side of centre.

The setting can be altered separately for both directions

within the range 30 ... 150%.

Default setting: 150% on both sides.

PERIOD (cycle time)

In this line you can determine the frame time for the

individual channel signals. This setting applies to all

control channels.

If you use digital servos exclusively, it is safe to set a

cycle time of 10 ms.

If you are using a mixture of servo types, or exclusively

analogue servos, it is essential to set 20 ms, otherwise

the servos will be “over-stressed” and may response by

jittering or making rumbling noises.

RX FAIL SAFE

INPUT CH: 01

MODE : HOLD

F.S.Pos. : 1500sec

DELAY : 0.75sec

OUTPUT CH: 01

FAIL SAFE ALL: NO

POSITION : 1500sec

Before we describe this menu a few words as a remin-

der:

“Doing nothing” is the worst thing you can do in this

regard. The default setting for the HoTT receiver is

“HOLD” mode.

If interference should occur with hold-mode in force, and

if you are very lucky, the model aircraft will ﬂ y straight

ahead for an indeﬁ nite period and then “land” somewhe-

re or other without causing major damage. However, if

the interference strikes in the wrong place and at the

wrong time, then a power model could become uncont-

rollable and tear wildly across the ﬂ ying ﬁ eld, endange-

ring pilots and spectators.

For this reason you really must consider whether you

should at least program the throttle to “motor stopped”,

to avoid the worst of these risks.

After that warning we present a brief description of the

three possible Fail-Safe variants offered by the mx-10

HoTT transmitter:

The simplest way of setting Fail-Safe - and the one we

recommend - is to use the “Fail-Safe” menu, which is

accessed from the multi-function list; see page 116.

A similar alternative, albeit slightly more difﬁ cult to

access, is to use the “FAIL-SAFE ALL” option described

on the next double-page.

And ﬁ nally there is the relatively complex method of

entering individual settings using the “MODE”, “F.S.Pos.”

and “DELAY” options. The description of this variant

starts below with the “MODE” option.

Value Explanation Possible settings

OUTPUT CH Output channel

(receiver servo

socket)

1 … according to

receiver

INPUT CH Input channel

(control channel

coming from

transmitter)

1 … 16

MODE Fail-Safe mode HOLD

FAIL SAFE

OFF

F.S.Pos. Fail-Safe position 1000 … 2000 μs

DELAY Response time

(delay)

0,25, 0,50, 0,75

and 1,00 s

FAIL SAFE

ALL

Stores fail-safe

positions for all

control channels

NO / SAVE

POSITION Displays stored

Fail-Safe position

between approx.

1000 and 2000 μs

OUTPUT CH (servo socket)

In this line you select the OUTPUT CH (receiver servo

socket) which is to be adjusted.

INPUT CH (input channel select)

As already mentioned on page 117, the six control func-

tions of the mx-10 HoTT transmitter can be shared out

between several receivers if necessary, or alternatively

several receiver outputs can be assigned to the same

control function; for example, you may wish to be able

to operate each aileron with two servos, or to control an

oversized rudder using two coupled servos instead of a

single one.

Sharing control functions amongst multiple HoTT recei-

vers is a useful idea for large-scale models, for example,

to avoid long servo leads. In this case bear in mind that

only the last bound receiver can be addressed using the

“Telemetry” menu.

The ﬁ ve control channels (INPUT CH) of the mx-10

HoTT can be managed in the appropriate manner using

the facility known as “channel mapping”, i. e. by assig-

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