GF82.62-P-0001SX Antenna System (ATS), Function
GF82.62-P-0001SX Antenna System (ATS), Function
- except CODE (494) USA version
- except CODE (498) Japan version
Preliminary remarks
The following description deals with the antenna systems for
^ COMAND (without navigation) (code 526),
^ COMAND APS (with navigation) (code 527),
^ with and without sound system (code 810),
^ Digital/analog TV tuner (code 863),
^ Preinstallation for telephone "Handy", UPCI system (code 386),
^ Telephone "Handy", UPCI system (code 388),
^ Radio remote control with reduced range without panic button (code 761),
^ Radio remote control with panic switch (code 763),
^ Keyless Go (code 889) and
^ Stationary heater (code 228)
are described in the following.
General information
The various antennas are designed according to their special reception and transmission ranges. There are active and passive antennas. The antennas can be designed as transmission, reception or as transmission/reception antennas. The antennas transmit or receive voice information by converting electromagnetic radio waves into an electric voltage and vice versa.
Passive antennas
Passive antennas do not require a power supply.
Active antennas
Active antennas are supplied with power and have an integrated amplifier. The voltage supply can be provided on separate lines or via a coaxial cable (phantom feed). The actual signal is transmitted via this coaxial cable.
Transmit/receive antennas
The transmission/reception antennas are
^ the telephone antenna (A2/49a1) in the telephone and GPS roof antenna (A2/49) and
^ the Bluetooth antenna (A2/91).
Reception antennas
Receive antennas are
^ the AM antenna in the rear window,
^ the FM1 to FM4 antennas in the rear window,
^ the TV1 to TV4 antennas in the rear window,
^ the radio remote central locking antenna in the rear window and
^ the GPS antenna (A2/49a2) in the telephone and GPS roof antenna.
The Keyless Go antenna system (code 889) is described in separate documentation. In vehicles with Keyless Go the authorization signal is received by the radio remote central locking antenna.
Location of components
Component Identification:
Description, block diagram of antenna system
The rear window FM1 to FM4 and AM antenna signals are picked up, filtered and amplified by the rear window antenna amplifier module. A diversity processor in the rear window antenna amplifier module selects the strongest signal from the FM antenna signals and relays it to the audio tuner control unit. The AM signal is also relayed to the audio tuner control unit.
A phantom voltage (DC offset) is used to switch between AM and FM. If a voltage of 0 volts is present at the intermediate frequency input of the rear window antenna amplifier module, it operates in AM mode.
If a direct voltage of 12 volts is present at the intermediate frequency input of the rear window antenna amplifier module, it operates in FM diversity mode.
Antenna signals TV1 to TV4 are picked up, amplified and relayed to the TV combination tuner (analog/digital) by the antenna amplifier module.
The signals of the radio remote central locking antenna in the rear window are picked up by the rear window antenna amplifier module. Processing of the signal depends on the vehicle equipment.
The radio remote central locking signal of the antenna is switched to a radio remote central locking receiver in the rear window antenna amplifier module, demodulated and directly transmitted to the rear SAM control unit with fuse and relay module for further processing.
For vehicles without Keyless Go (code 889), a phantom voltage (DC offset) of 0 volts is applied at the Keyless Go input of the rear window antenna amplifier module
If the vehicle is equipped with Keyless Go, a phantom voltage of 5 volts is present at the Keyless Go input of the rear window antenna amplifier module. The radio remote central locking signal with the Keyless Go authorization signal is switched to the Keyles Go outlet and directly relayed to the Keyless Go control unit. The radio remote central locking signal and the Keyless Go authorization signal are evaluated in the Keyless Go control unit.
The signals received by the GPS antenna are directly relayed to the COMAND control unit (COMAND APS (with navigation) (code 527)) .
Telephone signals are transmitted and received via the telephone antenna (with telephone "Handy", UPCI system (code 388)). In vehicles with stationary heater (stationary heater (code 228)), this antenna also receives signals from the STH radio remote control transmitters and transmits radio remote control transmitter confirmation signals.
The telephone/portable CTEL/STH radio remote control antenna splitter is only installed in vehicles with a stationary heater. The telephone signals received by the telephone antenna and the signals from the STH radio remote control transmitter are relayed to the STH radio remote control receiver and the E-net compensator via the telephone/portable CTEL/STH radio remote control antenna splitter.
The E-net compensator is connected to the portable CTEL via the UPCI [UHI] portable CTEL holder (Universal Handy Interface).
Transmitted telephone signals are relayed to the telephone antenna by the E-net compensator via the telephone/portable CTEL/STH radio remote control antenna splitter.
The portable CTEL is connected to the Universal Portable CTEL Interface (UPCI [UHI]) control unit via the UPCI [UHI] portable CTEL holder (Universal Portable CTEL Interface) via data and control lines.
External equipment can communicate with the Universal Portable CTEL Interface (UPCI [UHI]) control unit via the Bluetooth antenna. Signals can be transmitted to or received from the external equipment.
Once the telephone "Handy", UPCI system (code 386) has been preinstalled, the vehicle is ready for the UPCI [UHI] portable CTEL holder (Universal Portable CTEL Interface) and the portable CTEL itself to be simply inserted.
