Chevrolet Silverado Classic 2007, Owner'S Manual

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Radio Reception
Frequency interference and static during normal
radio reception can occur if items such as
cellphone chargers, vehicle convenience
accessories, and external electronic devices
are plugged into the accessory power outlet.
If there is interference or static, unplug the item
from the accessory power outlet.
AM
The range for most AM stations is greater than
for FM, especially at night. The longer range
can cause station frequencies to interfere with
each other. For better radio reception, most
AM radio stations boost the power levels during
the day, and then reduce these levels during
the night. Static can also occur when things
like storms and power lines interfere with radio
reception. When this happens, try reducing
the treble on your radio.
FM Stereo
FM stereo gives the best sound, but FM signals
reach about 10 to 40 miles (16 to 65 km). Tall
buildings or hills can interfere with FM signals,
causing the sound to fade in and out.
XM™ Satellite Radio Service
XM™ Satellite Radio Service gives digital radio
reception from coast-to-coast in the 48 contiguous
United States, and in Canada. Just as with FM,
tall buildings or hills can interfere with satellite
radio signals, causing the sound to fade in and out.
In addition, traveling or standing under heavy
foliage, bridges, garages, or tunnels can cause
loss of the XM™ signal for a period of time.
The radio could display NO XM SIGNAL to indicate
interference.
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