Radio Mode, Basic Function - GF82.60-P-9902A
Model All (4xWD)
Model All (CAR)
Overview
This document contains information on:
- General
- Function requirements
- Function
- Special features of FM radio mode (cars)
- Special features of DAB radio mode (cars)
- Transfer of additional information
General
In radio mode, radio signals are converted into audio signals. The audio signals are output over the speaker system. Radio mode is operated via the multimedia system's display and control elements.
Function requirements
- Circuit 30t ON
- Transport mode not active.
- System activation must have been performed.
- Anti-theft protection is deactivated.
- In electric vehicles: Range maximization is not activated for the interior function area.
- For off-road vehicles with stealth light: Stealth light not switched on.
Radio mode function
The antennas receive the electromagnetic waves of the radio signals.
An antenna amplifier amplifies the signals and transmits these to multimedia system control. There, the signals are converted into audio signals by an integrated audio tuner and transmitted to the speaker system. This outputs the audio signals via the speaker.
Depending on the equipment installed, the following radio signals can be received and processed:
- AM (amplitude modulation)
- FM (frequency modulation)
- DAB (digital radio (DAB))
- HD radio (North America)
- SDARS (Satellite Digital Audio Radio Service)
Special features of FM radio mode (cars)
For FM radio mode, an FM twin tuner is integrated into the head unit.
The head unit therefore uses the signals from both FM antennas simultaneously and calculates an optimized signal from both signals (phase diversity).
The radio station search is carried out in the background via a third FM tuner.
Special features of DAB radio mode (cars)
The DAB tuner supports the extended audio codecs DAB+ and Digital.
Multimedia Broadcasting (DMB) audio, in addition to DAB, and so enables the reception of programs transmitted with these codecs.
The DAB tuner unit is designed as a diversity tuner and provides the following advantages:
- Switching to the antenna with the better signal (reception diversity)
- Almost inaudible switchover between various ensembles with identical program
- Faster switchover to another Ensemble
- Searching for available stations/ensembles and receiving the
"Electronic Program Guide" program index in the background
If a radio station is available as an FM station as well as a DAB station, then there will be a switchover to the FM station if the DAB reception deteriorates. Switchover to reception of the FM station only occurs after checking and ensuring a better signal reception. In this case, multimedia system control compensates the time offset between the digital and analog signal. This makes the switchover almost inaudible ("seamless linking").
Transfer of additional information
As well as radio programs, many radio stations also broadcast additional information such as the station name, type of program and traffic message channel recognition. Multimedia system control evaluates this information and displays it.
Depending on the equipment installed, the following additional information can be received and processed:
- RDS (radio data system)
- RBDS (Radio Broadcast Data System) (North America)
- VICS (Japan)
| Function schematics | |||
|---|---|---|---|
| Function schematic for radio/TV mode | Model 118.3, 177.1/9 | PE82.60-P-2502-97C | |
| Model 118.6, 177.0, 243, 247 | PE82.60-P-2502-97A | ||
| Model 167 | PE82.60-P-2502-97B | ||
| Model 206, 254 | PE82.60-P-2502-97I | ||
| Model 213.0/1, 238.3, 257, 290 as of model year 2021 | PE82.60-P-2502-97E | ||
| Model 213.2 as of model year 2021 | PE82.60-P-2502-97F | ||
| Model 223 | PE82.60-P-2502-97H | ||
| Model 232 | PE82.60-P-2502-97K | ||
| Model 238.4 as of model year 2021 | PE82.60-P-2502-97G | ||
| Model 293 | PE82.60-P-2502-97D | ||
| Model 295, 296, 297 | PE82.60-P-2502-97J | ||
| Function schematic for radio/media mode | Model 464 with code EF6 (Digital radio) | PE82.60-P-2504-97A | |
| Further basic function | |||
| Antenna system, basic function | GF82.62-P-9901A |