GF82.85-P-2030RC Audio Mode, Function
GF82.85-P-2030RC Audio Mode, Function
- with CODE (523) MB Audio 20 radio
Function requirements
^ Status "Circuit 30 ON" or "Circuit 15R ON"
^ Audio system authorized and operating properly
^ No fault in antenna system (radio function)
^ Audio-CD is inserted (for disk operation)
^ A radio data system (RDS) station is set and the RDS function activated
^ Radio stations also transmit additional digital information
^ Traffic Announcement (TA) function set on the radio (A2)
General audio mode function sequence
The audio mode function consists of the following function sequences:
^ Radio operation (FM/AM/SW/LW/MW) function sequence
^ Disk function sequence
Operating instructions
Control, selection or adjustment of the audio functions is possible with the following components:
- Left multifunction steering wheel button group (S110) or right multifunction steering wheel button group (S111)
- Control buttons on the radio
Radio operation (FM/AM/SW/LW/MW) function sequence
The rod antenna (A28) receives high frequency (HF) signals for the radio frequency ranges FM and AM (MW, LW, SW). The following useful signals relevant for the radio reception are modulated onto these HF signals:
- Music signals
- Speech signals
- Data signals (e.g. Traffic Message Channel (TMC) messages (traffic information))
The HF signals are routed to the left antenna amplifier module (A2/64) via a direct line. The left antenna amplifier module filters the radio frequency band frequencies from the HF frequency signals received, and amplifies these.
The amplified signals are then sent via a coaxial cable (FM, AM) to the tuner integrated in the radio where they are demodulated.
The demodulated audio signals are output directly on the following speakers by the radio:
- Left door speaker group (H4/1)
- Right door speaker group (H4/2)
- Left rear speaker (H4/7)
- Right rear speaker (H4/8)
- Center cockpit speaker (centerfill) (H4/27)
- Left door tweeter (H4/33)
- Right door tweeter (H4/34)
The Radio mode function sequence also includes the following subfunction sequences:
^ Function sequence for AM tuner (MW, LW, SW)
^ FM double tuner function sequence with phase diversity (FM)
^ TP traffic information function sequence (FM only)
^ RDS function sequence (with FM only)
Function sequence for AM tuner (MW, LW, SW)
For the MW, LW and SW radio frequency bands, the useful signals are broadcast using amplitude modulation (AM). The AM tuner integrated into the radio demodulates these signals. I. e. it separates the audio signals (audible frequencies) from the carrier signal (not audible).
FM double tuner function sequence with phase diversity (FM)
For the FM radio frequency band, the useful signals are broadcast using frequency modulation (FM). The FM tuner integrated into the radio demodulates these signals. I. e. it also separates the audio signals (audible frequencies) from the carrier signal (not audible).
TP traffic information function sequence (FM only)
If the radio receives a traffic announcement while a radio station or a CD is playing, the traffic announcement has priority, i.e.:
- The volume of the traffic announcement is increased for radio operation.
- If a CD is playing, playback is stopped and the traffic announcement made.
RDS function sequence (with FM only)
Digital, inaudible information such as station names, types of program (PTY) (e.g. pop, classic) and traffic program identification is evaluated by the radio and displayed on the radio display.
Disk function sequence
The disc function sequence comprises the following subfunction sequences:
^ CD function sequence or MP3
^ AUX function sequence
CD function sequence or MP3
A CD drive is integrated into the radio. The CD drive is used to read in the audio CDs (including in MP3 format) and they are internally processed by the radio. User guidance for controlling CD functionality (e.g. track selection) and displaying supplemental information (e.g. track name) takes place using the radio display. The audio is then output directly via the radio on the following speakers:
- Left door speaker group
- Right door speaker group
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Left door tweeter Right door tweeter
AUX function sequence
If an external device (e.g. MP3 player) is connected in the glove compartment, the basic display appears. The following appears on the display of the radio:
- Status line
- No display
- Field of application
- No display, 2 speaker symbols only
- Function bar
- "AUX" and "Tone"
The associated submenus can be called up on the radio display in the following menu items:
- "AUX" menu item
- No other submenus
- "Tone" menu item
- Treble
- Bass
- Balance/Fader
The menu navigation and display of the connection options are shown on the display of the radio and are dependent on the respective portable terminal connected.
The audio is then output directly via the radio on the following speakers:
- Left door speaker group
- Right door speaker group
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Left door tweeter
- Right door tweeter
