GF82.85-P-2030SXU Audio Mode, Function

GF82.85-P-2030SXU Audio Mode, Function
- Radio, CD

Component Identification:

Radio mode, function
After the COMAND controller unit as well as the COMAND display have been switched on by pressing the button "ON" (A40/9s6) at the front central operating unit and the "Radio" menu has been activated, the antenna structures in the rear window start receiving high frequency (RF [HF]) signals for ultra-short wave (FM [UKW]) and medium wave (MW). Modulated onto these HF signals are music, voice and data signals. The rear window antenna amplifier module filters the radio frequency band frequencies from the RF [HF] signals received, and amplifies these. The amplified signals are then transmitted to the 2 radio tuners in the audio tuner control unit via a coaxial line.
The 2 radio tuners separate the useful information (audible frequencies) from the carrier signal (not audible). The demodulated audio signals are amplified and converted into sound signals by the vehicle speakers.

Antenna diversity, function
In the case of the "antenna diversity" function, reception-dependent switching over is carried out between the FM antennas of the rear window. The function is automatic and is carried out by the rear window antenna amplifier module. The 2 radio tuners in the audio tuner control unit merely generate the intermediate frequency (IF) signal, which serves as a reference for changing the FM antenna.

2-receiver technology function
The two (integrated) radio receivers in the audio tuner control unit automatically generate, after the COMAND controller unit is switched on, a list of the FM stations received, which is constantly updated during operation.

Station selection options are:
^ Automatic station search with the Scan function (the stations of a waveband are played for t = 8 s)
^ Station search on multifunction steering wheel (MFL)
^ Manual station search
^ Station selection using list of stations
^ Station selection using numeric keyboard
^ Station selection using frequency input
^ station selection from the memory (10 stations per waveband)

Satellite digital audio radio (satellite radio) (SDAR) (with code (536) SIRIUS satellite radio)
Together with SDAR, the SDAR control unit and the SDAR antenna are installed in the vehicle. The SDAR control unit permits, in combination with the SDAR antenna, the reception of stations from the provider "Sirius satellite radio".

DVD and CD mode, function
The COMAND controller unit is equipped with an integrated CD/DVD drive that can be used to play audio CDs and DVDs and navigation media. It is also possible to play audio data in MP3 format.
In addition to playing back audio signals, the COMAND controller unit provides the following functions in DVD and CD mode:
^ "Random" function
All tracks on a CD or DVD are played according to the random principle.
^ "Repeat" function
A track, CD, or DVD can be repeated if required.
^ "Scan" function
The tracks on a CD or DVD are played for t = 8 s. After this has been run through completely, the scan function is automatically terminated.
^ "Select next/previous" function
The system only jumps forward or backward to the next or previous track; no audio signals can be heard in the process.
^ "Music search" function
The music that is being played is audible during music search. This enables certain sections of a track to be played or skipped.
^ "Track list" function
The desired track is selected with the aid of the front central operating unit on the COMAND display and confirmed.

In addition to the listed functions, supplemental information is shown on the COMAND display (e.g. playing time, track list and name of the performer). The COMAND display receives the control commands from the COMAND controller unit via the telematics CAN.

DVD changer mode (with code (814) DVD changer)
The DVD changer is integrated in the COMAND controller unit and is operated via the COMAND controller unit.

The media that can be played in the DVD changer of the COMAND controller unit also include audio CDs and audio DVDs in MP3 format.