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Vehicle electronics
222
Notes on installing two-way radios
G
WARNING
The electromagnetic radiation from two-way
radios can interfere with the vehicle electron-
ics if they are manipulated or retrofitted incor-
rectly. This could jeopardise the operating
safety of the vehicle. There is a risk of an acci-
dent.
You should have all work on electrical and
electronic components carried out at a quali-
fied specialist workshop.
G
WARNING
If you operate two-way radios incorrectly in
the vehicle, their electromagnetic radiation
can interfere with the vehicle electronics, for
example if:
the two-way radio is not connected to an
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exterior aerial
the exterior aerial is not correctly mounted
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or is not low-reflection
This could jeopardise the operating safety of
the vehicle. There is a risk of an accident.
Have the low-reflection exterior aerial fitted at
a qualified specialist workshop. When oper-
ating two-way radios in the vehicle, always
connect them to the low-reflection exterior
aerial.
!
The operating permit may be invalidated if
the instructions for installation and use of
two-way radios are not observed.
In particular, the following conditions must be
complied with:
only approved wavebands may be used
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observe the maximum permissible output
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in these wavebands
only approved aerial positions may be used
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On the rear wings, it is recommended that you
position the aerial on the side of the vehicle
closest to the centre of the road.
When retrofitting RF transmitters, consult the
Technical Guidelines, ISO/TS 21609 (Road
Vehicles — EMC guidelines for installation of
aftermarket radio frequency transmitting equip-
ment). Observe the legal requirements for
attachments.
If your vehicle is equipped with two-way radio
equipment, use the power supply and aerial con-
nectors provided in the basic wiring. When fit-
ting, always observe the manufacturer's supple-
ment.
The maximum transmission output (PEAK) at the
base of the aerial must not exceed the values in
the following table:
Waveband and maximum transmission output:
Frequency range
Short wave (f<50MHZ)
4 m waveband
74 - 88 MHz
2 m waveband
144 - 174 MHz
Trunked radio/Tetra
380 - 460 MHz
70 cm waveband
400 - 460 MHz
Mobile telephones
(2G/3G/4G)
The following can be used in the vehicle without
restrictions:
RF transmitters with a maximum transmis-
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sion output of up to 100 mW
RF transmitters with transmitter frequencies
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in the 380 - 410 MHz waveband and a maxi-
mum transmission output of up to 2 W
(trunked radio/Tetra)
mobile phones (2G/3G/4G)
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There are no restrictions when positioning the
aerial on the outside of the vehicle for the fol-
lowing wavebands:
Trunked radio/Tetra
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70 cm waveband
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2G/3G/4G
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Maximum trans-
mission output
(PEAK)
100 W
30 W
50 W
35 W
35 W
10 W
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