Radio mode, function - GF82.60-P-2001TM

MODEL 211, 219 with CODE (523) MB Audio 20 radio with CODE (510) Audio 20 with CD changer as of Model Year 9/AEJ 07 

Function requirements 

• Status "Circuit 30 ON" or "Circuit 15R ON"
• The radio is authorized and in perfect working order
• No fault in antenna system
• A Radio Data System (RDS) station is set and the RDS function activated
• The radio station also transmits additional digital information
• Traffic Announcement (TA) function set on the radio (A2)

General information 

The antennas in the rear window receive high frequency (HF) signals for the ultra-short wave (FM), short wave (SW), medium wave (MW), and long wave (LW) radio frequency bands.

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))

These HF signals are routed to the left antenna amplifier module (A2/64).

The left antenna amplifier module filters the radio frequency band frequencies from the HF signals received, and amplifies these. The amplified signals are then sent via coaxial cable to the tuner integrated in the radio where they are demodulated.

The demodulated audio signals in vehicles with code 810 Sound system are transferred by the radio via the Media Oriented System Transport (MOST) to the sound system amplifier (N40/3) and amplified.

The audio is then output by the following speakers via direct lines:

• Left front door speaker group (H4/1)
• Right front door speaker group (H4/2)
• Left rear door speaker group (H4/3)
• Right rear door speaker group (H4/4)
• Bass box speaker (H4/17)
• Center cockpit speaker (centerfill) (H4/27)
• Left rear surround speaker (H4/54)
• Right rear surround speaker (H4/57)

The audio signal for the bass box speaker travels from the radio control panel and navigation unit (A2/56) to the sound system amplifier via MOST and from there, via direct lines to the bass box speaker via the subwoofer amplifier (N40/9).

For vehicles except code (810) Sound system, the audio signals are finally amplified in the radio control panel and navigation unit and then sent to the following speakers via direct lines:

• Left front door speaker group
• Right front door speaker group
• Left rear door speaker group
• Right rear door speaker group
• Center cockpit speaker (centerfill)

MW, LW, SW function sequence 

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. In other words, it separates the useful signals (audible frequencies) from the carrier signal (inaudible).

FM, TMC function sequence 

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. In other words, it also separates the useful signals (audible frequencies) from the carrier signal (inaudible).

RDS function requirements 

• An RDS station is tuned in.
• The "RDS" function is activated

Function sequence for RDS 

As well as the normal radio program, many radio stations (FM) transmit additional digital information such as the station name, the program type (PTY) (e.g. pop, culture, etc.) and traffic program identification. The additional digital information is evaluated and displayed by the radio.

Digital Audio Broadcasting (DAB), function

With code 537 Digital radio With code 833 Great Britain version

GF82.60-P-3020TM