Radio Frequency Information; Radio Reception Factors - Ford 1999 Ranger Owner's Manual

Controls and features

Radio frequency information

The Federal Communications Commission (FCC) and the Canadian Radio
and Telecommunications Communications (CRTC) establish the
frequencies AM and FM stations may use for their broadcasts. Allowable
frequencies are:
AM 530, 540–1600, 1610 kHz
FM 87.9, 88.1–107.1, 107.9 MHz
Not all frequencies are used in a given area.

Radio reception factors

Three factors can affect radio reception:
• Distance/strength. The further an FM signal travels, the weaker it is.
The listenable range of the average FM station is approximately 40 km
(24 miles). This range can be affected by "signal modulation." Signal
modulation is a process radio stations use to increase their
strength/volume relative to other stations.
• Terrain. Hills, mountains and tall buildings between your vehicle's
antenna and the radio station signal can cause FM reception problems.
Static can be caused on AM stations by power lines, electric fences,
traffic lights and thunderstorms. Moving away from an interfering
structure (out of its "shadow") returns your reception to normal.
• Station overload. Weak signals are sometimes captured by stronger
signals when you pass a broadcast tower. A stronger signal may
temporarily overtake a weaker signal and play while the weak station
frequency is displayed.
The audio system automatically switches to single channel reception if it
will improve the reception of a station normally received in stereo.
Audio system warranties and service
Refer to the "Warranty Guide" for audio system warranty information.
If service is necessary, see your dealer or a qualified technician.
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