Actions

DCS

From The RadioReference Wiki

Revision as of 10:09, 9 April 2009 by Aaknitt (talk | contribs)

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

Additional Information

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

Sound Card Decoding

DCSdecode is a free program that can be used to decode DCS codes using a PC and receiver with discriminator output.