Mercedes-Benz ML320. Manual — part 245

Fig. 68: Identifying Rear Window Antennas Design

The individual antennas are attached to the inner side of the rear window.

The AM antenna in some cases is part of the heating elements of the rear window defroster. The AM signals
are decoupled by the radio antenna splitter (A2/5) .

All the antennas are matched in terms of their length and shape to the particular frequency band which they
receive.

REAR WINDOW ANTENNAS, FUNCTION - GF82.62-P-3106-04GH

Model 163

Function:

The radio signals are received by the rear window antenna (A2/32) (AM, FM ). The high-frequency
oscillations (RF) of the electrical field in the air are converted into an electrical alternating voltage .

A standing electrical wave is formed in the antenna as a result of the correct matching of the length of the
antenna to the wavelength of the frequency to be received.

In this case, the amplitude of the RF signal has a constant value at a random point of the antenna. The RF
signal level is at the maximum at the connection point. A variation of the length of the antenna from its
optimum length results in a reduction in the RF signal level at the antenna output. If the variation is too large,
no further signal is received (for example if the antennas are incorrectly connected to the antenna amplifier).

REAR WINDOW ANTENNA, LOCATION/PURPOSE /DESIGN/FUNCTION - GF82.62-P-3106GH

MODEL 163

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

Fig. 69: Identifying Rear Window Antennas Location

FM/AM ANTENNA AMPLIFIER, LOCATION - GF82.62-P-4101-01GH

Model 163

Location:

the FM/AM amplifier (A2/18) is located in the tailgate.

Rear window antennas,
location

The antennas are located
in the rear window

Rear window antennas,
purpose

Reception of the
following radio signals:



AM, FM (WB only

)

Rear window antennas,
design

GF82.62-P-3106-03GH

Rear window antennas,
function

GF82.62-P-3106-04GH

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

Fig. 70: Identifying FM/AM Antenna Amplifier Location

FM/AM ANTENNA AMPLIFIER, FUNCTION - GF82.62-P-4101-04GH

The radio signals are received by the rear window antenna (A2/32) and passed to the signal input of the
FM/AM amplifier (A2/18) . This amplifies the signals and passes them over a coaxial cable to the receiver of
the radio set of the audio unit.

FM/AM ANTENNA AMPLIFIER, LOCATION/PURPOSE/DESIGN/FUNCTION - GF82.62-P-4101A

MODEL 163, 168, 170, 208.4, 210.2

MODEL 208.3, 210 (except, 210.2) except CODE (352a) COMAND operating and display system

FM/AM antenna
amplifier, location

Model 168

GF82.62-P-4101-01A

Model 170

GF82.62-P-4101-01B

Model 208

GF82.62-P-4101-01D

Model 210 (except 210.2)

GF82.62-P-4101-01E

Model 210.2

GF82.62-P-4101-01C

Model 163

GF82.62-P-4101-
01GH

FM/AM antenna
amplifier, purpose

Amplification of the FM/AM
radio signals

FM/AM antenna



Coaxial connection for

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

TELEPHONE ANTENNA, LOCATION - GF82.62-P-4105-01E

Fig. 71: Identifying Telephone Antenna

TELEPHONE ANTENNA, LOCATION/PURPOSE - GF82.62-P-4105GH

MODEL 163 with CODE (853) MB standard cellular telephone with CODE (854) MB portable cellular
telephone

amplifier, design

signal outputs



Connections for power
supply and signal
inputs/outputs

If the voltage supply of the

FM/AM amplifier (A2/18)
fails, the AM signal path is
interrupted. FM reception is
possible with reduced reception
quality.

FM/AM antenna
amplifier, function

GF82.62-P-4101-04A

FM/AM antenna
amplifier, function

Model 163

GF82.62-P-4101-
04GH

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me