2018-2026 Mercedes A Class 4 Door Technical data -> Vehicle electronics User Manual
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Technical data -> Vehicle electronics for Your Mercedes A Class 4 Door Third Generation (2018-2026)

Technical data  
324  
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Notes on techhnical data  
You should have all work on electrical  
and electronic components carried out  
at a qualiꢀed specialist workshop.  
When operating two-way radios in the  
vehicle, always connect them to the low-  
reꢁection exterior antenna.  
*
NOTE Mercedes-AMG vehicles  
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Observe the notes in the Supplement.  
You could otherwise fail to recognize  
dangers.  
&
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WARNING Risk of accident due to  
improper operation of two-way radios  
NOTE Invalidation of the operating permit  
due to failure to comply with the instruc-  
tions for installation and use  
If you use two-way radios in the vehicle  
improperly, their electromagnetic radiation  
can disrupt the vehicle's electronics. This is  
the case in the following situations, in particu-  
lar:  
The data stated only applies to vehicles with  
standard equipment. You can obtain further infor-  
mation from an authorized Mercedes-Benz Cen-  
ter.  
The operating permit may be invalidated if the  
instructions for installation and use of two-way  
radios are not observed.  
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Only use approved frequency bands.  
R
The two-way radio is not connected to an  
exterior antenna.  
#
Observe the maximum permissible out-  
put power in these frequency bands.  
Vehicle electronics  
Two-way radios  
R
The exterior antenna is installed incor-  
rectly or is not a low-reꢁection antenna.  
#
Only use approved antenna positions.  
Notes on installing two-way radios  
This could jeopardize the operating safety of  
the vehicle.  
&
WARNING Risk of accident due to  
improper work on two-way radios  
#
Have the low-reꢁection exterior antenna  
installed at a qualiꢀed specialist work-  
shop.  
If two-way radios are manipulated or retroꢀt-  
ted incorrectly, the electromagnetic radiation  
from the two-way radios can interfere with the  
vehicle electronics and jeopardize the operat-  
ing safety of the vehicle.  
Technical data  
325  
On the rear fenders, it is recommended that you  
install the antenna on the side of the vehicle clos-  
est to the center of the road.  
Frequency band and maximum transmission out-  
put  
Frequency band  
Maximum transmis-  
sion output  
Use Technical Speciꢀcation ISO/TS 21609 (Road  
Vehicles – "EMCs for installation of aꢂermarket  
radio frequency transmitting equipment") when  
retroꢀtting two-way radios. Comply with the legal  
requirements for detachable parts.  
Short wave  
3 - 54 MHz  
100 W  
30 W  
50 W  
10 W  
4 m frequency band  
74 - 88 MHz  
If your vehicle has installing for two-way radio  
equipment, use the power supply and antenna  
connectors provided in the pre-installation.  
Observe the manufacturer's supplements when  
installing.  
2 m frequency band  
144 - 174 MHz  
Terrestrial Trunked  
Radio (TETRA)  
Two-way radio transmission output  
The maximum transmission output (PEAK) at the  
base of the antenna must not exceed the values in  
the following table.  
1
2
3
4
Front roof area  
Rear roof area  
Rear fenders  
Trunk lid  
380 - 460 MHz  
70 cm frequency band  
420 - 450 MHz  
35 W  
10 W  
Two-way radio  
(2G/3G/4G)  
On vehicles with a panoramic sliding sunroof,  
installing an antenna to the front or rear roof area  
is not permitted.  

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