HD Radio is a registered trademark for In-Band On-Channel Technology (IBOC), selected by the Federal Communications Commission (Federal Communications Commission (FCC)) for digital audio terrestrial broadcasting in the United States. A large number of radio stations now broadcast simultaneously on the AM and FM bands. FM frequencies allow multiple frequency streams to be transmitted on a single FM frequency. HD radio has the advantage over SDARS that reception is free and no subscription is required.
HD radio enhances the sound quality of the received signal so that FM reception gives sound reproduction close to CD quality, and AM reception gives the same "rich" sound, as well as analog stereo sound in the FM band. On HD radio, both AM and FM offer interference-free and crystal-clear reception. An additional advantage is FM Multicasting - the ability to broadcast multiple program streams on one FM frequency (for example, 97.7-1, 97.7-2, etc.). The HD radio module is capable of receiving traditional analogue programs from radio stations that do not have digital broadcasts, in addition to receiving digital broadcasts alongside analogue programs from radio stations that offer digital output.
The HD radio module replaces the AM/FM function in IAM. The AM and FM antennas connect directly to the HD radio module, not to the IAM; therefore, the AM/FM features in IAM are disabled.
The transmitted audio signals are digitally compressed by the radio transmitter. The audio signal, along with digital broadcasting, is also transmitted in its current analog form. The HD radio module receives analog and digital signals via AM and FM antennas, accompanied by text broadcasts. These signals are decoded by the module and played back as audio output or displayed as informational text on the head unit LCD or ICM LCD depending on the installed system.
The HD radio module is located on the left side of the luggage compartment. The module receives fused power from the AJB. The module also connects to the MOST bus and is able to communicate with other infotainment systems in the car.
High definition radio (North America only) (Freelander 2)
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Inspection and verification
Table of signs of malfunctions of the navigation system
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Pinpoint tests
Navigation system troubleshooting tests
Bolt tightening torques
Description and principle of operation
Low Series Audio System
High Series Audio System
AM/FM tuner
CD player
Additional power socket
Rear seat headphone modules
Controls located on the steering wheel
SDARS (North America only)
Table of signs of malfunctions of the navigation system
DTC Fault Code Index
Pinpoint tests
Navigation system troubleshooting tests
Bolt tightening torques
Description and principle of operation
Low Series Audio System
High Series Audio System
AM/FM tuner
CD player
Additional power socket
Rear seat headphone modules
Controls located on the steering wheel
SDARS (North America only)
Current article
High definition radio (North America only)
Next articles
Master system clock
Power Amplifiers
Control scheme
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Speaker control circuit (high level)
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Navigation system control scheme
How the navigation system works
Removing and installing the audio block
Speaker in the front door
Speaker in rear door
Removing and installing the video system display
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Satellite radio receiver
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Low-frequency speaker amplifier
Removal and installation of the subwoofer
Controls of the audio system in the back seat
Bluetooth module
Navigation system that works with DVDs
Description and principle of operation of the antenna
Antenna control circuit
Power Amplifiers
Control scheme
Speaker Location
Speaker control circuit (basic level)
Speaker control circuit (mid level)
Speaker control circuit (high level)
Mobile phone description
Mobile phone control scheme
Navigation system
Navigation system control scheme
How the navigation system works
Removing and installing the audio block
Speaker in the front door
Speaker in rear door
Removing and installing the video system display
Removal and installation of the antenna of the audio system
Satellite radio receiver
Removing and installing a cell phone antenna
Low-frequency speaker amplifier
Removal and installation of the subwoofer
Controls of the audio system in the back seat
Bluetooth module
Navigation system that works with DVDs
Description and principle of operation of the antenna
Antenna control circuit
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