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DCS


CDCSS or Digital Code Squelch (DCS) is a further development of the continuous tone-coded squelch system or CTCSS that uses a slow-speed, binary data stream passed as sub-audible data along with the transmission. Motorola calls this Digital Private Line or DPL. It consists of a 23-bit telegram sent repeatedly on the channel at 134 bits per second along with the voice transmission. This allows for over 100 possible fleet codes to be used. This gives it an advantage over the CTCSS tones in that there are more possible codes to use; however, it does use more bandwidth and can be affected by voice tones below 300 Hz if not properly filtered by the radio circuitry. Below is a chart of the DCS codes:

6 50 125 174 255 343 445 526 703
7 51 131 205 261 346 446 532 712
15 53 132 212 263 351 452 546 723
17 54 134 214 265 356 454 565 731
21 65 141 223 266 364 455 606 732
23 71 143 225 271 365 462 612 734
25 72 145 226 274 371 464 624 743
26 73 152 243 306 411 465 627 754
31 74 155 244 311 412 466 631
32 114 156 245 315 413 503 632
36 115 162 246 325 423 506 654
43 116 165 251 331 431 516 662
47 122 172 252 332 432 523 664

Inverted Codes

  • The left column can be the standard, which makes the right inverted, or the left can be inverted which makes the right standard.


Code1 Code2
023 047
025 244
026 464
031 627
032 051
036 172
043 445
047 023
051 032
053 452
054 413
065 271
071 306
072 245
073 506
074 174
114 712
115 152
116 754
122 225
125 365
131 364
132 546
134 223
143 412
145 274
152 115
155 731
156 265
162 503
165 251
172 036
174 074
205 263
212 356
223 134
225 122
226 411
243 351
244 025
245 072
246 523
251 165
252 462
255 446
261 732
263 205
265 156
266 454
271 065
274 145
306 071
311 664
315 423
325 526
331 465
332 455
343 532
346 612
351 243
356 212
364 131
365 125
371 734
411 226
412 143
413 054
423 315
431 723
432 516
445 043
446 255
452 053
454 266
455 332
462 252
464 026
465 331
466 662
503 162
506 073
516 432
523 246
526 325
532 343
546 132
565 703
606 631
612 346
624 632
627 031
631 606
632 624
654 743
662 466
664 311
703 565
712 114
723 431
731 155
732 261
734 371
743 654
754 116

Thanks to Voyager for the chart values

Sound Card Decoding

ScanScope and DCSdecode are free programs that can be used to decode DCS codes using a PC and receiver with discriminator output.

Related Links

More technical information on DCS can be found at these links:


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