Operating Instructions
GPS for M-LINK receivers
Page 12
Instru
ctions -
GPS
for M-L
INK
re
cei
v
er
s
#
82 5
492
(03.
08
.2015
LA)
•
Error
s
and
omission
s
excepted
!
•
MULT
IPLEX
6.
A
ERIAL CHARACTERISTICS
The reception characteristics of the aerial are designed to
enable reception in virtually all directions (omni-
directional).
7.
I
NSTALLING THE
GPS
IN THE MODEL
1) Position the GPS in the model in a suitable location
for optimum reception conditions, i.e. giving the aerial
(
6.
) an unobstructed “view” over as large an area of
the sky as possible in most flight attitudes:
Model gliders (thermal soarers)
In this case we recommend installing the MULTI-
PLEX GPS standing vertically in the fuselage, i.e.
with the aerial pointing up.
Aerobatic models
An alternative location is horizontal, aligned with the
fuselage centreline.
2) To prevent signal shielding, ensure that the GPS aerial
is as far away as possible from conductive materials:
Electrically conductive materials such as carbon fibre,
metal foil or metallic paints shield the signal, and have
an adverse effect on reception. The same applies to
house walls and materials containing water, such as
grass, leaves and trees. Materials such as GRP and
ELAPOR
®
foam have no adverse effect provided that
the material thickness is in the ‘normal’ range.
A good position is under a canopy made of non-con-
ductive material.
3) Secure the GPS in the model using Velcro (hook-and-
loop) tape or similar. Protect your GPS from vibration,
especially in models with I.C. engines (e.g. pack it
loosely in shock-absorbing foam).
!
Note:
The signals from the GPS satellites are transmitted on a
frequency of around 1.58 GHz, and are propagated in a
comparable manner to the signals of the M-LINK system
operating on 2.4 GHz. However, they are many times
weaker due to the distance of the satellites, which is about
20,200 kilometres:
This means that you should deploy the GPS with the
same care you would apply when installing and
deploying the aerial(s) of your M-LINK receiver!
8.
C
ONNECTIONS
Connect the GPS connecting lead (marked RX/S) to the
sensor socket of your telemetry-capable M-LINK receiver
(marked “S” or “SENSOR”).
Alternatively - if you are using multiple M-LINK sensors -
the GPS can be connected to another M-LINK sensor
using the socket marked “S”.
When connecting the UNI lead (RX/S) take care to insert
the connector the right way round, and maintain correct
polarity (pin assignment) if using non-MULTIPLEX equip-
ment.
!
Note:
If you have to configure the GPS, it must be connected to
the MULTImate or PC
on its own
. If you wish to set up
alarm thresholds on the GPS, or activate additional
measurement channels, this means that you should
always do so before installing the unit in the model.
9.
U
SING THE
GPS
FOR THE FIRST TIME
Switch the RC system ON, and ensure that reception is
possible:
As clear a view of the sky as possible for the GPS
Model not resting in tall grass, under trees or indoors
After a wait of one to a few minutes the first values will
be displayed on your transmitter screen, or on the
Telemetry-Display.
!
Notes:
If no data, or irregular data, is transmitted even after a
long period, you will need to improve the installed location
and / or the aerial position of the GPS.
It is perfectly normal for the GPS to display no values at
all in an enclosed space. This is not a GPS error!
10.
I
NTEGRAL BUFFER BATTERY
When you switch the RC system OFF - and with it the
GPS - an integral buffer battery continues to power the
GPS receiver’s clock for a few minutes, even without an
external power supply. During this period the unit also
stores the satellite trajectory data.
This simply means that, when you switch ON for the first
time in a flying session, you have to wait a short while
before reception is present.
If you fly the model again immediately after switching off,
reception will be restored within just a few seconds of
switching the system ON or connecting the battery.
11.
D
EFAULT
GPS
SETTINGS
The following default data are displayed on the transmitter
screen or the Telemetry-Display:
Address 9:
Spatial groundspeed (3D) in km/hr
Address 10:
Altitude above fixed point in metres (m)
Address 11:
Spatial distance (3D) to fixed point in metres (m) /
distance
In this context the “address” means:
The screen line on the ROYALevo / pro transmitter
The screen line on the Telemetry-Display
The INFO display on the COCKPIT SX M-LINK
at which the corresponding telemetry value is displayed.
The default model type is “fast plane” (= fast aircraft)
(
15.4.
).
Summary of Contents for 85417
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