High definition tuner control unit, component description - GF82.60-P-5005GU

MODEL 463.237 /271 up to 31.5.12 with CODE (EU7) HD Radio as of Model Year 2009 /YoM 08 

Location 

The high definition tuner control unit is located on a bracket on the left in the trunk in the toolbox.

Task 

The high definition tuner control unit has the following tasks:

• Receive signals 
• Demodulating and decoding signals 
• Transmitting signals 

Receive signals 

The following signals are received via a direct line:

• Power supply via circuit 31 and circuit 30g
• Electronic wake-up for Media Oriented System Transport (MOST)
• Frequency-modulated (FM) 2 signals from the amplifier module 1, window antenna (A2/71)
• Amplitude-modulated (AM), FM 1 and weatherband signals from the amplifier module 3, window antenna (A2/73)
• Satellite S-band and terrestrial S-band signals from the satellite digital audio radio antenna (SDAR) (A2/82)

Demodulating and decoding signals 

The following signals are demodulated and decoded:

• Demodulating the analog AM and FM signals by the two integrated double tuners
• Decoding the digital AM and FM signals with the integrated HD radio decoder chip
• Decoding the signals for S-band satellite and S-band terrestrial

Transmitting signals 

The transmission of the signals takes place via the following connections:

• Direct lines 
• MOST 

Direct lines 

The following signals are transmitted via a direct line:

• Phantom voltage to the amplifier module 1, window antenna
• Phantom voltage to the amplifier module 3, window antenna
• Phantom voltage to the satellite digital audio radio antenna (SDAR)

MOST 

The following signals are transmitted via MOST:

• Demodulated and decoded analog and digital AM/FM signals and Weatherband signals as digital audio signals to the COMAND operating, display and controller unit (A40/3)
• Demodulated and decoded digital AM/FM signals as digital data signals (e.g. frequency, station name, artist) to the COMAND operating, display and controller unit.
• Demodulated and decoded digital S-band satellite and S-band terrestrial signals as digital audio signals to the COMAND operating, display and controller unit
• Demodulated and decoded digital S-band satellite and S-band terrestrial signals as digital data signals (e.g. channel, artist, category, list of stations) to the COMAND operating, display and controller unit
• Demodulated and decoded digital S-band satellite and S-band terrestrial signals as digital traffic data signals to the navigation unit integrated into the COMAND operating, display and controller unit