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The Basics
military, some amateur radio, and some government
transmissions. (Refer to “Specifi cations” for a list of
the frequencies covered.) When the scanner receives a
transmission on a channel set to the AM mode, it always
stops on the transmission.
FM mode
The FM mode sets the scanner to receive transmissions
using frequency modulation (FM), used for most public
safety transmissions, as well as broadcast, business, and
amateur radio transmissions. When the scanner receives
a transmission on a channel set to the FM mode, it always
stops on the transmission.
CTCSS (CT) mode
CTCSS mode sets the scanner to receive transmissions
using frequency modulation (FM) with Continuous Tone
Coded Squelch System (CTCSS) subaudible tone codes.
CTCSS allows multiple users to share a single radio
frequency without hearing each other’s transmissions. In
your PRO-97 scanner, the CTCSS feature can be used to
block the reception of transmissions on shared channel to
only those that use the CTCSS mode also features a Code
Search setting that allows you to instantly display and store
unknown codes into the channel memory. CTCSS tones can
sometimes be heard as a low “hum” in the background of a
voice transmission.
DCS (DC) mode
DCS mode sets the scanner to receive transmissions using
frequency modulation (FM) with Digital Coded Squelch
(DCS) subaudible data signaling. DCS is very similar to
CTCSS, except that a digital code is transmitted instead of
an audio tone. Like CTCSS, DCS allows multiple users to
share a single radio frequency without hearing each other’s