gf8271p2000t

Taxi hands-free system function

Type gf · topic 82.71 · version 0101 · 2007-03-21

Applies to: MODELS 211.0 /2 with CODE (450) Taxi version

Where it sits

Function group 3 Body › 82 Electrical system, body › 82.71 Two-way radio — Series 211 (models 0**, 2**)

GF82.71-P-2000T

Taxi hands-free system function

21.1.03

MODELS 211.0 /2 with CODE (450) Taxi version

15.03.07

The document has been updated to this date

and will no longer be subject to revision.

Function requirements

No overvoltage or undervoltage
(is detected by the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9))

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:

Service radio (A49)

Microphone (B25/1)

Left front double-coil speaker (H4/19)

Lower control panel control unit (N72) with
two-way radio switch (N72s11)

Telephone/GPS/two-way radio roof antenna (A2/49)

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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.

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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".

Two-way radio switch, location/task/function

GF82.71-P-2101T

Special vehicle multifunction control unit (SVMCU [MSS]), location/task/design/function

GF82.25-P-4112T

Taxi hands-free system microphone, location/task

GF82.71-P-2201T

Referenced documents