GF82.60-P-2001PMJ Radio Mode, Function

GF82.60-P-2001PMJ Radio Mode, Function

MODEL 203.0 /2 /7 as of 24.4.04
- with CODE (529) HIGH Class Japan
- up to Model Year 8

The radio menu is activated by actuating the "FM/AM" button on the COMAND operating, display and control unit (A40/3). If the "FM" or "AM" button is pressed, the default screen appears with the menu input for manually or automatically stored stations. Here, the last station listened to is highlighted by a green bar.
The radio can be also operated by "scrolling" via the multifunction steering wheel (MFL). The following functions can be selected in the radio menu:
- Autostore (updates list of stations in qualitative sequence)
- Memory for 2x6 stations per waveband
- Automatic storage for stations with strongest signals
- Automatic noise suppression
- Separate traffic information stations in "AM" frequency range
- FM Stereo concept (with field-strength dependent mono/stereo transition)
- Field strength dependent high cut
- Memory function (last station)
- Manual and automatic station search in all wavebands
- SCAN function in all wavebands (stations are played for t = 7 s.).
- Traffic information (TI)
- Memory location call up

Radio mode, function
Radio operation is realized by means of a radio tuner integrated into the audio gateway control unit (N93/1). This radio tuner can only be operated using the COMAND operating, display and control unit (A40/3).

The high-frequency signals required for radio operation are received over the 4 FM antennas and an AM antenna on the rear window. The antennas are connected to the window antenna amplifier module 1 (A2/71) (model 203.2) and window antenna amplifier module 2 (A2/72) (models 203.0/7). The music, voice and/or data signals are modulated upon these high-frequency signals. The amplifier modules filter the frequencies from the radio frequency bands out of the radio frequency signals received and amplify them. The amplified signals are then transferred to each radio tuner (AM or FM) in the audio gateway control unit (N93/1) by a coaxial cable (AM, FM). The radio tuner demodulates the high-frequency signals. In doing so the useful information (audible frequency) is separated from the carrier signal (inaudible frequency). An audio signal amplifier integrated into the audio gateway control unit (N93/1) amplifies the demodulated audio signals and emits them over the vehicle speakers.

If a station's transmission range is left, then automatic control is not performed to retain the station. The current frequency allocation is then valid for the corresponding transmission range.

Several stations also transmit additional digital data along with the radio programs (stock exchange, weather reports, etc.). This information can be read as videotext on the display of the COMAND operating, display and control unit (A40/3).

FM antenna diversity, function
For this purpose, the system automatically switches over between the FM antennas depending on the reception. This function is performed by the window antenna amplifier module 1 (A2/71) (model 203.2) and window antenna amplifier module 2 (A2/72) (models 203.0/7). The radio tuner merely generates the IF signal (intermediate frequency) which serves as a reference for changing the FM antenna.