All About Radio Frequencies - Ford Probe Owner's Manual

displayed frequency does not change. While
passing the tower, the station may switch back
and forth a few times before returning to the
original station.
When several broadcast towers are present
(common in metropolitan areas), several stations
may overload the receiver, resulting in
considerable station changing, mixing and
distortion.
Automatic gain control circuitry for both AM
and FM bands has been incorporated into this
system to reduce strong signal capture and
overload.

All About Radio Frequencies

The Federal Communications Commission (FCC)
and the Canadian Radio Telecommunications
Commission (CRTC) establish the frequencies
that AM and FM radio stations may use for
their broadcasts. The allowable frequencies are,
AM: 530, 540...1600, 1610 kHz in 10 kHz steps;
FM: 87.9, 88.1...107.7, 107.9 MHz in 0.2 MHz
steps.
Not all frequencies will be assigned to a given
area. This radio will tune to each of these
frequencies using manual tune and no fine
tuning is necessary as radio stations may not use
other frequencies.
Some FM radio stations advertise a
"rounded-off" frequency which is not the
frequency they actually broadcast on. For
example, a radio station that is assigned a
frequency of 98.7 MHz may call itself "Radio 99"
even though 99.0 MHz is not an allowable FM
broadcast frequency.
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