Multiplex 85417, Operating Instructions Manual

Page: 17 / 42

Operating Instructions
GPS for M-LINK receivers
Page 17
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
3. Fixed point
The fixed point is set when the GPS is switched on:

As the current position:
… if the GPS signal is very accurate, and the
MULTIPLEX GPS is not moving,
or:

As the last established position:
… if the GPS signal is very accurate, and the MULTI-
PLEX GPS is moving.
4. Re. the “Model type” setting
Model type Maximum
horizontal speed Maximum
vertical speed
Slow aircraft /
car 79 km/hr 54 km/hr
Boat 79 km/hr -
Fast aircraft /
jet
360 km/hr 360 km/hr
a) “Slow plane“ / “Langsames Flugzeug“ setting
(= slow aircraft)
You can fine-tune the data output on the transmitter
screen or the Telemetry-Display by selecting the approp-
riate model type setting:
For example, it is not possible for a slow aircraft (“Slow
plane“ / “Langsames Flugzeug“ setting) to fly at a speed
of 300 km/hr. If the GPS measures such an implausible
value for this model category, it is clearly based on a
“false measurement”, so it suppresses the value.
False measurements may occur due to unfavourable
aerial deployment, poor weather (heavy cloud cover),
contact with only a small number of satellites, reflections,
shielding effects, etc.
Neither is it possible for a slow aeroplane to fly tight
changes of direction at high speed; this would manifest
itself as extremely fast alternating position values. If the
GPS detects such behaviour, then this also invariably
represents incorrect measurements. Once again, the GPS
suppresses the measured values in the data output when
the “Slow plane“ / “Langsames Flugzeug“ setting is selected.
The net result is that the values generated at the trans-
mitter or the Telemetry-Display exhibit less pronounced
scatter if the GPS is set to the “Slow plane“ / “Langsames
Flugzeug“ setting.
b) “Fast plane“ / “Schnelles Flugzeug“ setting
(= fast aircraft)
High-speed aeroplanes are certainly capable of moving
very quickly in a zig-zag course, i.e. fast changes of
direction are possible with this aircraft type. For this
reason the GPS does not suppress rapid changes of po-
sition when the “Fast plane“ / “Schnelles Flugzeug“ setting
is selected.
One result of this is that the values generated at the trans-
mitter or the Telemetry-Display exhibit more pronounced
scatter if the GPS is set to the “Fast plane“ / “Schnelles
Flugzeug“ setting.
But please note: it is nevertheless possible that the model
aeroplane has not flown these (measured) changes of
direction at all, i.e. they may represent false measure-
ments caused by unfavourable aerial deployment, poor
weather, contact with a small number of satellites,
reflections, shielding effects, etc.
c) Summary
In general terms it is advisable to select the “Slow plane“ /
“Langsames Flugzeug“ setting for a model aircraft, pro-
vided that the values shown on the transmitter screen or
the Telemetry-Display appear to be plausible; if you select
the “Fast plane“ / “Schnelles Flugzeug“ setting, the GPS
will tend to consider valid any erroneous measurements
which would have been correctly assessed as false at the
“Slow plane“ / “Langsames Flugzeug“ setting.
5. Re. the “Azimuth“ setting
This angle value represents the model’s position relative
to North (
 19. ). This angular value may well help you to
find the model after an out-landing.
6. Re. the “Heading“ setting
This angle value represents the “compass in the model”:
imagine you are sitting in the model and looking at a
compass. This angular information enables you to “fly a
course” (
 19. ).
Examples:

0°  model flying North

90°  model flying East

180°  model flying South

270°  model flying West
7. Re. the “Elongation“ setting
This angle value represents the model’s direction of
flight relative to the pilot. The North Pole plays no role in
the “Elongation” setting; what matters is the fixed point
(
 19. )!
Examples:

0°  model flying away from the pilot

90°  model flying to the right

180°  model flying towards the pilot

270°  model flying to the left
16. CE
CONFORMITY DECLARATION
This device has been assessed and approved
in accordance with European harmonised di-
rectives.
This means that you possess a product whose design and
construction fulfil the protective aims of the European
Community designed to ensure the safe operation of
equipment.