Mazda mx5 Owner's Manual page 281

NOTE
To prevent the battery from being
discharged, do not leave the audio
system on for a long period of time
when the engine is not running.
If a cellular phone or CB radio is
used in or near the vehicle, it could
cause noise to occur from the audio
system, however, this does not
indicate that the system has been
damaged.
Do not spill any liquid on the audio
system.
Do not insert any objects, other than CDs,
into the slot.
Radio Reception
AM characteristics
AM signals bend around such things as
buildings or mountains and bounce off the
ionosphere.
Therefore, they can reach longer distances
than FM signals.
Because of this, two stations may
sometimes be picked up on the same
frequency at the same time.
Ionosphere
Station 1 Station 2
FM characteristics
An FM broadcast range is usually about
40—50 km (25—30 miles) from the
source. Because of extra coding needed to
break the sound into two channels, stereo
FM has even less range than monaural
(non-stereo) FM.
FM Station
40—50km
(25—30 miles)
Interior Features
Audio System
5–15