Digital Code Squelch

Digital Code Squelch

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.

DCS Codes

Below is a chart of the DCS codes:

650125174255343445526703
751131205261346446532712
1553132212263351452546723
1754134214265356454565731
2165141223266364455606732
2371143225271365462612734
2572145226274371464624743
2673152243306411465627754
3174155244311412466631
32114156245315413503632
36115162246325423506654
43116165251331431516662
47122172252332432523664

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.
Code1Code2
023047
025244
026464
031627
032051
036172
043445
047023
051032
053452
054413
065271
071306
072245
073506
074174
114712
115152
Code1Code2
116754
122225
125365
131364
132546
134223
143412
145274
152115
155731
156265
162503
165251
172036
174074
205263
212356
223134
Code1Code2
225122
226411
243351
244025
245072
246523
251165
252462
255446
261732
263205
265156
266454
271065
274145
306071
311664
315423
Code1Code2
325526
331465
332455
343532
346612
351243
356212
364131
365125
371734
411226
412143
413054
423315
431723
432516
445043
446255
Code1Code2
452053
454266
455332
462252
464026
465331
466662
503162
506073
516432
523246
526325
532343
546132
565703
606631
612346
624632
Code1Code2
627031
631606
632624
654743
662466
664311
703565
712114
723431
731155
732261
734371
743654
754116

Thanks to Voyager for the chart values

Sound Card Decoding

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

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