Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 413

The exterior aerial is fitted incorrectly or is
R
not a low-reflection aerial.
This could jeopardise the operating safety of
the vehicle.
Have the low-reflection exterior aerial fit-
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ted at a qualified specialist workshop.
When operating two-way radios in the
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vehicle, always connect them to the low-
reflection exterior aerial.
* NOTE Invalidation of the operating permit
due to failure to comply with the instruc-
tions for installation and use
The operating permit may be invalidated if the
instructions for installation and use of two-way
radios are not observed.
Only use approved frequency bands.
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Observe the maximum permissible out-
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put power in these frequency bands.
Only use approved aerial positions.
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Vehicles without panoramic sliding sunroof
1
Rear roof area
On vehicles with a panoramic sliding sunroof, fit-
ting an aerial is not permitted.
Use Technical Specification ISO/TS 21609 (Road
Vehicles – "EMCs for installation of aftermarket
radio frequency transmitting equipment") when
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Technical data 411
retrofitting two-way radios. Comply with the legal
requirements for detachable parts.
If your vehicle has fittings for two-way radio equip-
ment, use the power supply and aerial connectors
provided in the pre-installation. Observe the man-
ufacturer's supplements when fitting.
▌Two-way radio transmission output
The maximum transmission output (PEAK) at the
base of the aerial must not exceed the values in
the following table:
Frequency band and maximum transmission out-
put
Frequency band Maximum transmis-
2 m frequency band
144 - 174 MHz
Terrestrial Trunked
Radio (TETRA)
380 - 460 MHz
sion output
50 W
10 W