Radio Shack PRO-96 Owner's Manual page 20

mode, it always stops on the
transmission.
CTCSS Mode (CT)
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-96 scanner, the CTCSS
feature can be used to block the
reception of transmissions on
shared channel to only those that
use the CTCSS tone that you have
specified. 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. Many systems that
use CTCSS transmit a special
"turn off code" at the end of each
transmission. The turn off code
causes a properly equipped
receiver to mute before the
transmission ends, eliminating the
"squelch tail" burst of noise the
commonly occurs when the signal
is lost. CTCSS turn off code
performance can be affected by
weak signals.
DCS Mode (DC)
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
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