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HD radio (High Definition radio) function - GF82.60-P-2030LEU

MODEL 216 with CODE (517) HD Radio as of model year 2010 /YoM 09 

MODEL 221 with CODE (517) HD Radio as of model year 2010 /YoM 09 model refinement package 

Function requirements, general 

High-definition (HD) radio, general 

The HD radio function is implemented in the high definition tuner control unit (N87/8), which is a combined AM/FM/Weather Band (WB) receiver with HD radio function and a satellite radio for receiving audio and traffic data.

The HD radio feature allows the following signals to be received:

FM signal reception is optimized by use of a double tuner.

The HD radio function allows additional reception of digital carrier waves for analog AM/FM programs, which are also broadcast by the stations.

The HD radio function improves the audio quality using digital technology:

The stations also broadcast other audio channels and data by means of digital carriers. This supplements the program with up to two additional audio channels per frequency (e.g. foreign language program from "National Public Radio" (NPR)) and supplemental information (e.g. title and artist).

The broadcasting of additional data is known as "On Channel". The digital station is tuned to the same frequency as the analog station. The digital transmission process in the FM and AM band is known as "in-band".

The HD radio function also enables over 100 digital audio channels from the Sirius radio provider to be received together with the corresponding supplemental information.

To achieve multichannel reception, the Sirius satellite radio signal is transmitted three times (from two satellites and one terrestrial station).

It is also possible to receive Real Time Traffic Data (RTTD). RTTD are real time traffic data that are broadcast by the satellite radio provider Sirius.

These data are available nationwide in the USA, are transmitted in loops of t = 5 min. and are available in a navigation format similar to the traffic message channel (TMC).

IMPORTANT In contrast to satellite digital audio radio (satellite radio) (SDAR), with HD radio, regional stations and programs can be received without incurring fees.

The SDAR function allows the following signals to be received:

The system can be operated using the following components:

Function sequence for HD radio 

The SIRIUS satellite radio signal is received by the SDAR antenna (A2/82) (model 216) or telephone and GPS roof antenna (A2/49) (model 221) and forwarded over a coaxial cable to the high definition tuner control unit. In addition, the high definition tuner control unit receives the AM and FM signals directly from the rear window antenna amplifier module (A2/12).

IMPORTANT The SDAR antenna on model 221 is integrated into the telephone and GPS roof antenna.

The high definition tuner control unit decodes and demodulates the analog AM/FM signals using the two integrated double tuners, the digital AM/FM signals using the integrated HD radio decoder chip and the signals for S-band satellite and S-band terrestrial. The high definition tuner control unit sends digital audio and data signals over the Media Oriented System Transport (MOST) to the COMAND controller unit (A40/3). The COMAND controller unit shows the information contained in the signals on COMAND display (A40/8) (without code (867) SPLITVIEW) or on the SPLITVIEW display (A40/10) (with code (867) SPLITVIEW).

The traffic data is processed by the navigation unit integrated into the COMAND controller unit.

The desired station is selected using:

Operation can take place using the following controls:

The control signals from the buttons of the COMAND controller unit are processed internally.

The control signals of the multifunction steering wheel button groups are transferred to the COMAND control unit over the following path:

When operating using the VCS [SBS], the voice commands are received by the handsfree system microphone group (A67b1) and transferred to the COMAND controller unit over a direct line. The audio signals are output over the vehicle's speaker system.

To this end, the high definition tuner control unit sends the audio signals over MOST to the audio tuner control unit (N93/1) or the digital sound processor (A2/69) (model 221 as of 1.9.10 with code (811) Advanced Sound System), where they are processed, amplified and then emitted through the vehicle's speaker system.

The speaker system in model 216 comprises the following components:

The speaker system in model 221 with code (810) Sound system comprises the following components:

The speaker system in model 221 (as of 1.9.10) with code (811) Advanced Sound System comprises the following components:

IMPORTANT The woofers and bass box speaker on model 221 (as of 1.9.10) with code (811) Advanced Sound System are actuated by the sound amplifier (A2/13), which is controlled by the digital sound processor.

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic for SDAR function Model 216 PE82.60-P-2060-97CAA
Model 221 PE82.60-P-2060-97SAA
  Component description for COMAND controller unit A40/3 GF82.85-P-3136LEU
  COMAND display, component description A40/8
Without code (867) SPLITVIEW		 GF54.30-P-6110LE
  Front central operating unit, component description A40/9 GF54.21-P-4500LE
  SPLITVIEW display, component description A40/10
With code (867) SPLITVIEW		 GF54.30-P-6120LE
  Component description for steering column tube module N80 GF54.21-P-6050LE
  Component description for high definition tuner control unit N87/8 GF82.60-P-5005LEU 
  Audio tuner control unit, component description N93/1
Except model 221 as of YoM 10 with code (811) Advanced Sound System		 GF82.62-P-3132LES 
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