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Operating Instructions

GPS for M-LINK receivers

Page 12

Instructions - GPS for M-LINK receivers # 82 5492 (11-02-14/MIWA) • Errors and omissions excepted! •

MULTIPLEX

6. AERIAL CHARACTERISTICS

The reception characteristics of the aerial (the black

cylinder at the opposite end to the cable output) are

designed to enable reception in virtually all directions

(omni-directional). The only direction in which reception is

impossible is “back”, i.e. facing the GPS analysis electro-

nics and connecting leads.

7. INSTALLING 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

(Î 6.) an unobstructed “view” over as large an area of

the sky as possible in most flight attitudes:

x 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.

x 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. CONNECTIONS

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. USING THE GPS FOR THE FIRST TIME

Switch the RC system ON, and ensure that reception is

possible:

x As clear a view of the sky as possible for the GPS

x Model not resting in tall grass, under trees or indoors

Î 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. INTEGRAL 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. DEFAULT GPS SETTINGS

The following default data are displayed on the transmitter

screen or the Telemetry-Display:

x Address 9:

Spatial groundspeed (3D) in km/hr

x Address 10:

Altitude above fixed point in metres (m)

x Address 11:

Spatial distance (3D) to fixed point in metres (m) /

distance

In this context the “address” means:

x The screen line on the ROYALevo / pro transmitter

x The screen line on the Telemetry-Display

x 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)

(Î 15.4.).

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