E 320 4MATIC Wagon (211.282) V6-3.2L (112.954) (2003)
The hands-free two-way radio permits the taxi driver to communicate via the two-way radio, e.g. with the taxi control center.
The hands-free two-way radio comprises the following components:
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Service radio (A49)
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Microphone (B25/1)
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Left front double-coil speaker (H4/19)
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Lower control panel control unit (N72) with two-way radio switch (N72s11)
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Telephone/GPS/two-way radio roof antenna (A2/49)
The two-way radio (A49) is supplied with power via the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9).
When the two-way radio switch (N72s11) in the lower control panel control unit (N72) is pressed, the two-way radio (A49) is switched to transmission
mode. At the same time, the speaker of the radio control panel and navigation unit (A2/56) is muted. Now, the microphone located in the overhead
control panel (B25/1) can be used for communication.
The received radio communication is output via the left front double-coil speaker (H4/19). This speaker is also used for normal radio operation.
Electret microphone
This microphone has no coils and is therefore very compact. It is based on the capacitor principle.
A polarized (electret) diaphragm serving as a capacitor plate is caused to move by sound waves. This changes the capacitance with respect to the
parallel, rigid second capacitor plate. Connected to both capacitor plates are electrodes. As a result of the changing capacitance, a change in voltage
occurs, which can be picked up as a signal and amplified.
When the taxi emergency alarm (Code 934) is activated, the hands-free two-way radio of the special vehicle multifunction control unit (SVMCU [MSS])
(N26/9) is switched to "Monitor".
GF82.71-P-2101T Two-Way Radio Switch, Location/Task/Function
GF82.71-P-2101T Two-way Radio Switch, Location/Task/Function
- with CODE (450) Taxi version
Component Identification