LR3/Disco 3
The IHU can be remotely controlled via steering wheel mounted controls. The steering wheel controls are mounted to the
right hand side of the steering wheel.
The switches are a resistive ladder type. The IHU supplies a reference voltage to the switches, which then return an
altered voltage to the IHU depending on which switch is pressed.
The controls allow the user to adjust the volume, change CD (compact disc) tracks/radio pre-sets, answer and end a
phone call (where a phone is fitted) and use the voice recognition system.
SATELLITE DIGITAL AUDIO RADIO SERVICE (SDARS NAS only)
The SDARS systems operate in the S-Band frequency range (2.3 GHz) and, as a result of the use of satellite
transmission have the ability to provide CD (compact disc) quality audio broadcasts over very large areas (typically
continents). SDARS service providers transmit a signal from their up-link facility (which is the original point of transmission
of data, voice or other information through an antenna system) to a satellite where the signal is then down linked to both
the terrestrial repeater network and the individual SDARS car radios. The radio switches between the satellite signal and
the repeater signal depending on the strength of the signal at any given time.
Land Rover will be using the Sirius Satellite Radio service provider in the USA.
The Sirius SDARS systems comprise:
Satellites
Ground repeaters
Up-link ground stations
Radio receiver systems
The Sirius SDARS system uses three satellites on an inclined elliptical orbit. This ensures that each satellite spends
approximately 16 hours a day over the continent of the USA, with at least one satellite over the country at any one time.
The satellites beam their signals down to the ground where the signal is picked up by receivers or is transmitted to
repeater stations to cover built up areas where the signal is obscured.
TRAFFIC MESSAGE CHANNEL (TMC)
The TMC system is a European only system whereby traffic information is received by the TMC tuner and used by the
navigation computer to recalculate the route being used to avoid the traffic disruption. This system information is
broadcast on the RDS (radio data system) data carriers.
