Specifications

DIGITAL CHANNEL GUARD
Channel Guard provides a means of restricting calls to specific radios through the use of a continuous tone coded
squelch system (CTCSS), or a multi-code digital squelch system (DCG). tone frequencies range from 67Hz to
250.3Hz. There are 83 standard programmable digital codes.
The Channel Guard tone frequencies and codes are software programmable. Both tone frequencies and digital codes
may be mixed on each channel. The frequencies and codes are shown in Tables 1 and 2. A Channel Number display
that does not flash, indicates that Channel Guard is enabled, or that Channel Guard is not programmed. A flashing
Channel Number indicates that Channel Guard is programmed and disabled.
Table 1 - Channel Guard tone Frequencies
Standard Tone Frequencies in Hertz
67.0 71.9 74.4 77.0 79.7 82.5 85.4 88.5
91.5 94.8 97.4 100.0 103.5 107.2 110.9 114.8
118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4
156.7 162.2 167.9 173.8 179.9 186.2 192.8 203.5
210.7 218.1 225.7 233.6 241.8 250.3
Table 2 - Primary DCS Codes
DIGITAL SQUELCH CODES
023 114 174 266 411 506 703
025 115 205 271 412 516 712
026 116 212 274 413 523 723
031 122 223 306 423 526 731
032 125 225 311 431 532 732
036 131 226 315 432 546 734
043 132 243 325 445 565 743
047 134 244 331 446 606 754
051 143 245 332 452 612
053 145 246 343 454 624
054 152 251 346 455 627
065 155 252 351 462 631
071 156 255 356 464 632
072 162 261 364 465 654
073 165 263 365 466 662
074 172 265 371 503 664
MONOGRAM SERIES LBI-38865
OPERATION
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Nov. 94