Functional description of the digital tuner

DAB provides two frequency ranges for data interchange. The L band (1452 MHz to 1492 MHz) and band III (174 MHz to 240 MHz). The data is transferred digitally in certain channels within L band and band III to the vehicle. Each channel contains only one ensemble, which in turn contains the stations and additional information regarding the stations.

Broadcasting station structure for DAB:

• Ensemble 1
  
  • Service 1
    
  • Service 2
    
    • Subservice 1
      
    • Subservice 2
      
    • Subservice 3
      
  • Service 3
    
  • Service 4
    
  • Service 5
    

The digital tuner can cover 12 ensembles. One ensemble comprises up to 15 services. The service is comparable with an AM/FM station. A service can contain audio data or information. The subservices offered for the selected service are displayed. In the subservices, for example, the artist, album name and song title are transferred. Alternatively, more audio data can be transferred via the subservices.

Additional information on the digital tuner

Advantages of the digital tuner

• Sound quality close to CD/MD of digital reception is possible
  
• Additional data services.
  Singer, song title and album name
  News, weather, traffic reports, etc.
  
• Reduction in multiple reception
  

Functions of the digital tuner

• AUTOSTORE function
  With the AUTOSTORE function, the receiveable ensembles of the region are stored and are available. The services of the ensembles can then be played.
  

Personalising the digital tuner

The settings of the digital tuner can be personalised via the vehicle key. The following settings are then stored on a person-related basis:

• 12 services (stations)
  
• The last station listened to.
  
• Set band (L band or band III)
  

Technical information on the digital tuner

• Frequency of L band: 1452 MHz to 1492 MHz
  
• Frequency of band III: 174 MHz to 240 MHz
  
• Permitted voltage range (9 - 16 V)
  
• 1 aerial for band III
  
• 1 aerial for L band
  

Diagnosing the digital tuner

Before diagnosing the digital tuner, the power supply and bus communication must be safeguarded.

If the bus communication is working and no internal control unit faults of the digital tuner are stored, the aerials must be checked in the event of a customer complaint.