87
ST
Event Code
Warning Watch
Advisory
Definition?
sVr
severe Thunderstorm
Warning
o
Thunderstorm
sVs
severe Weather statement
o
severe Wx
Toa
Tornado Watch
o
Tornado
Toe
911 Telephone outage
emergency
o
911 Phone outage
Tor
Tornado Warning
o
Tornado
Tra
Tropical storm Watch
o
Tropical storm
TrW
Tropical storm Warning
o
Tropical storm
Tsa
Tsunami Watch
o
Tsunami
TsW
Tsunami Warning
o
Tsunami
TxB
Transmitter Backup on
o
Tx Backup on
TxF
Transmitter Carrier off
o
Tx Carrier off
Txo
Transmitter Carrier on
o
Tx Carrier on
TxP
Transmitter Primary on
o
Tx Primary on
VoW
Volcano Warning
o
Volcano
WFa
Wild Fire Watch
o
Wild Fire
WFW
Wild Fire Warning
o
Wild Fire
Wsa
Winter storm Watch
o
Winter storm
WsW
Winter storm Warning
o
Winter storm
**a
unrecognized Watch
o
unrecognized
**e
unrecognized emergency
o
unrecognized
**s
unrecognized statement
o
unrecognized
**W
unrecognized Warning
o
unrecognized
Continuous Tone Coded Squelch System (CTCSS) and Digital Coded Squelch (DCS) are two
methods used to prevent interference by other radio communications. Your scanner can receive
transmissions that use these codes.
CTCSS and DCS systems all use some form of coded squelch. Coded squelch involves the
transmission of a special code signal along with the audio of a radio transmission. A receiver with
coded squelch only activates when the received signal has the correct code. This lets many users
share a single frequency, and decreases interference caused by distant transmitters on the same
channel. In all major metropolitan areas of the United States, every available radio channel is
assigned to more than one user.
CTCSS fREQUENCIES
The scanner can detect the following 50 CTCSS frequencies.
67 .0hz
94 .8hz
131 .8hz
171 .3hz
203 .5hz
69 .3hz
97 .4hz
136 .5hz
173 .8hz
206 .5hz
71 .9hz
100 .0hz
141 .3hz
177 .3hz
210 .7hz
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