Volvo XC90 Owner's Manual page 263

channels will be displayed as 93.9 – 2
WNYC, 93.9 - 3 WNYC, etc.
•
Reception coverage area: Due to cur-
rent IBOC transmitter power limitations,
the reception coverage area in digital
mode is somewhat more limited than the
station's analogue coverage area. Please
be aware that as with any radio broadcast
technology, terrain, time of day, foliage
level and building location can have posi-
tive or negative effects on radio recep-
tion.
•
Analogue to digital/digital to analogue
blending: Analogue to digital blending
will occur as the signal strength reaches a
preset threshold in the receiver. This will
be noticeable in fringe areas (areas with
weak reception) and is normal.
NOTE
There may be a noticeable difference in
sound quality when a change from ana-
logue to digital or digital to analogue
occurs, such as:
•
Volume increase or decrease
•
Equalizer settings, i.e., Bass/ Mid-
range/Treble cut or boost
•
Time alignment (Digital program mate-
rial in extreme cases can be as much
as 8 seconds behind the analogue).
This will noticeable as a "stuttering"
effect.
The above items are dependant on the
broadcaster's equipment settings and
do not indicate a fault in the vehicle's
radio receiver or antenna systems.
Switching HD on or off
The factory setting for HD radio is on. How-
ever, when driving through areas with weak
HD signals (fringe areas), you may experience
that the radio repeatedly switches between
analogue/digital and digital/analogue recep-
tion. If this happens, it may be desirable to
switch HD off. To do so:
1. Be sure the audio system is switched on
and in AM or FM mode.
2. Press MENU in the center console con-
trol panel.
10 Audio
Radio functions
3. Press ENTER to turn HD off (the X will
disappear from the box on the display
screen).
This will disable the radio's capability to
receive digital broadcasts but it will continue
to function as a conventional (analogue)
AM/FM receiver. Please note that when HD is
switched off, it will not be possible to tune to
sub-channels (see the following section for a
more detailed explanation of sub-channels).
Repeat steps 2 and 3 above to reactivate HD
(an X will appear in the box on the display
screen).
Sub-channels
Example of an HD Radio station with sub-chan-
nels
10
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