Antenna: Description and Operation
Antenna
The antenna systems fitted to the vehicle comprise:
- AM (glass mounted)
- FM (glass mounted)
- Double FM 2 and 3 diversity (glass mounted, where fitted)
- TV (glass mounted, where fitted)
- GPS (global positioning system) antenna (roof mounted pod)
- SDARS (roof mounted NAS only)
- VICS antenna and beacon antenna (Japan only where fitted).
- DAB antenna (roof mounted pod and glass mounted where fitted).
Screen Aerial Components
AM/FM ANTENNAS
FM Antenna Amplifier
The AM (amplitude modulation)/FM (frequency modulation) antennas are located in the side and rear widow. All vehicles are equipped with FM (frequency modulation) diversity tuning. This system ensures that the best quality signal is used by the radio system to ensure the best possible FM (frequency modulation) reception. The standard AM (amplitude modulation)/FM (frequency modulation) antenna is screen mounted in the LH (left-hand) rear side window and is connected to an antenna amplifier located above the screen. The diversity system uses the same side window
antenna and amplifier but also uses a rear heated screen element antenna and an FM (frequency modulation) antenna amplifier mounted at the top of the rear screen in the tail gate for FM (frequency modulation) 2 and 3.
Digital Audio Broadcasting (DAB) Antennas
The DAB antennas are located in the RH (right-hand) rear side window (band-III) and in the roof mounted pod (band-L). The two antenna circuits each have a co-axial connection to the DAB module. DAB signals are transmitted on either DAB band III (174 - 240 MHz) or DAB band-L (1452 - 1492 MHz). Some countries may only use the band III signals, while others may only use the band-L signals. Some countries use both frequency ranges within the same geographical area. The type of DAB signal received depends on the vehicle market location. The DAB antennas are designed with 50 ohm output impedance. The DAB receiver is fitted with 50 ohm fakra II connectors to ensure compatibility with the antenna. For optimum performance 50 ohm low loss coaxial cable is used between the antenna and receiver.
VICS/TMC ANTENNA MODULE
The Traffic Message Channel (TMC) signals are received through the normal radio signals via the RDS network. The signals are routed separately form the radio signals via a separate antenna amplifier located on the RH (right-hand) rear side window.For additional information, refer to Navigation System Description and Operation. The module is fitted to the tailgate inner panel above the rear windscreen.
TV ANTENNA
TV Antenna Amplifier
Where a television system is specified there are four TV antenna elements two in each of the rear side windows. Each element has an antenna amplifier which is connected to the TV tuner module by a coaxial cable.For additional information, refer to Video System
If a vehicles fitted with telestart the RH module is a combined TV/telestart amplifier.
ROOF MOUNTED POD
Roof Mounted Antenna Pod
The roof mounted pod contains several antennas:
- GPS (global positioning system) antenna
- SDARS antenna (NAS only).
- DAB antenna (band-L)
The roof mounted pod is a standard fit on all vehicles.
Satellite Digital Audio Radio System (SDARS) Antenna (NAS Only)
The SDARS antenna is located in the roof mounted pod, which is located in the center of the roof at the rear of the vehicle. The SDARS antenna has one connection to the SDARS tuner for both satellite transmissions.
Antenna element:
- A printed dipole antenna for receiving satellite signals
The two antennas allow the system to receive SDARS transmissions in built up areas where signals form satellites would normally be blocked. For additional information, refer to Audio System
GPS (global positioning system) Antenna
The GPS (global positioning system) antenna is located in the roof mounted pod. The GPS (global positioning system) antenna is connected to the navigation computer by a coaxial cable.For additional information, refer to Navigation System Description and Operation
Digital Audio Broadcasting Antenna
The DAB band-L antenna is mounted within the roof mounted pod.
VICS ANTENNAS (Japan only)
VICS Beacon Antenna
The VICS control module is intergrated into the touch screen display.The Control module uses an infra red beacon antenna located in the middle on top of the instrument panel adjacent to the sunlight sensor and an antenna amplifier located on the RH (right-hand) top of the tailgate.For additional information, refer to Navigation System Description and Operation