Table of Contents
Advertisement
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.
The scanner can detect the following 50 CTCSS frequencies.
67.0Hz
69.3Hz
71.9Hz
74.4Hz
77.0Hz
79.7Hz
82.5Hz
85.4Hz
88.5Hz
91.5Hz
The scanner can detect the following 104 hexadecimal DCS codes.
006 031 054 116 145 205 245 266 332 411 452 506 612 703
007 032 065 122 152 212 246 271 343 412 454 516 624 712
015 036 071 125 155 214 251 274 346 413 455 523 627 723
017 043 072 131 156 223 252 306 351 423 462 526 631 731
021 047 073 132 162 225 255 311 356 431 464 532 632 732
023 050 074 134 165 226 261 315 364 432 465 546 654 734
025 051 114 141 172 243 263 325 365 445 466 565 662 743
026 053 115 143 174 244 265 331 371 446 503 606 664 754
CTCSS Frequencies
94.8Hz
131.8Hz
97.4Hz
136.5Hz
100.0Hz
141.3Hz
103.5Hz
146.2Hz
107.2Hz
151.4Hz
110.9Hz
156.7Hz
114.8Hz
159.8Hz
118.8Hz
162.2Hz
123.0Hz
165.5Hz
127.3Hz
167.9Hz
DCS Codes
171.3Hz
203.5Hz
173.8Hz
206.5Hz
177.3Hz
210.7Hz
179.9Hz
218.1Hz
183.5Hz
225.7Hz
186.2Hz
229.1Hz
189.9Hz
233.6Hz
192.8Hz
241.8Hz
196.6Hz
250.3Hz
199.5Hz
254.1Hz
97
Advertisement
Table of Contents
