Difference between revisions of "DCS"
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− | CDCSS or '''Digital Code Squelch''' (DCS) is a further development of the continuous tone-coded squelch system or [[Continuous Tone-Coded Squelch System|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: | + | CDCSS or '''Digital Code Squelch''' (DCS) is a further development of the continuous tone-coded squelch system or [[Continuous Tone-Coded Squelch System|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: | ||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
Line 31: | Line 34: | ||
==Inverted Codes== | ==Inverted Codes== | ||
− | {| border=" | + | * The left column can be the standard, which makes the right inverted, or the left can be inverted which makes the right standard. |
− | ! | + | |
− | ! | + | {| border="0" |
+ | |- valign="top" | ||
+ | | width="14%" | | ||
+ | |||
+ | {| {{table}} | ||
+ | !Code1 | ||
+ | !Code2 | ||
|- | |- | ||
|023 | |023 | ||
Line 88: | Line 97: | ||
|115 | |115 | ||
|152 | |152 | ||
+ | |- | ||
+ | |} <!-- end of an inner table --> | ||
+ | |||
+ | | width="14%" | | ||
+ | |||
+ | {| {{table}} | ||
+ | !Code1 | ||
+ | !Code2 | ||
|- | |- | ||
|116 | |116 | ||
Line 142: | Line 159: | ||
|223 | |223 | ||
|134 | |134 | ||
+ | |- | ||
+ | |} <!-- end of an inner table --> | ||
+ | |||
+ | | width="14%" | | ||
+ | |||
+ | {| {{table}} | ||
+ | !Code1 | ||
+ | !Code2 | ||
|- | |- | ||
|225 | |225 | ||
Line 196: | Line 221: | ||
|315 | |315 | ||
|423 | |423 | ||
+ | |- | ||
+ | |} <!-- end of an inner table --> | ||
+ | |||
+ | | width="14%" | | ||
+ | |||
+ | {| {{table}} | ||
+ | !Code1 | ||
+ | !Code2 | ||
|- | |- | ||
|325 | |325 | ||
Line 250: | Line 283: | ||
|446 | |446 | ||
|255 | |255 | ||
+ | |- | ||
+ | |} <!-- end of an inner table --> | ||
+ | |||
+ | | width="14%" | | ||
+ | |||
+ | {| {{table}} | ||
+ | !Code1 | ||
+ | !Code2 | ||
|- | |- | ||
|452 | |452 | ||
Line 304: | Line 345: | ||
|624 | |624 | ||
|632 | |632 | ||
+ | |- | ||
+ | |} <!-- end of an inner table --> | ||
+ | |||
+ | | width="14%" | | ||
+ | |||
+ | {| {{table}} | ||
+ | !Code1 | ||
+ | !Code2 | ||
|- | |- | ||
|627 | |627 | ||
Line 347: | Line 396: | ||
|116 | |116 | ||
|} | |} | ||
+ | |||
+ | |- | ||
+ | |} <!-- end outer table --> | ||
<small> Thanks to Voyager for the chart values</small> | <small> Thanks to Voyager for the chart values</small> | ||
− | == | + | ==Sound Card Decoding== |
+ | [http://www.coaa.co.uk/scanscope.htm ScanScope] and [https://sites.google.com/site/radioetcetera/home/dcsdecodeprogram DCS Decoder] 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: | More technical information on DCS can be found at these links: | ||
− | *[http://onfreq.com/syntorx/dcs.html http:// | + | *[http://onfreq.com/syntorx/dcs.html DPL / DCS Information] |
− | *[http:// | + | *[http://mmi-comm.tripod.com/dcs.html DCS Explained] |
+ | *[http://www.repeater-builder.com/tech-info/ctcss/ctcss-overview.html CTCSS/DCS Technical Overview] | ||
+ | * For the current ETSI Standard TS 103 236 Continuous Tone Controlled Signalling System (CTCSS) and Digitally Coded Squelch Signalling (DCSS) document, go to the [https://www.etsi.org/standards ETSI Standards search page] and search for '''ETSI TS 103 236'''. | ||
+ | |||
+ | ==Related Wiki Articles== | ||
+ | * [[Continuous Tone-Coded Squelch System]] | ||
+ | * [[Tone Signaling]] | ||
− | |||
− | |||
[[Category:RR Glossary]] | [[Category:RR Glossary]] | ||
+ | [[Category:Amateur Radio Glossary]] | ||
+ | [[Category:Database Glossary]] | ||
+ | [[Category:HF Glossary]] | ||
+ | [[Category:Military Glossary]] | ||
+ | [[Category:Professional Radios Glossary]] | ||
+ | [[Category:Receivers Glossary]] | ||
+ | [[Category:Scanners Glossary]] | ||
+ | [[Category:Signal Analysis and Decoding Glossary]] | ||
+ | [[Category:Software Glossary]] |
Latest revision as of 15:45, 25 February 2019
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:
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.
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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.
Related Links
More technical information on DCS can be found at these links:
- DPL / DCS Information
- DCS Explained
- CTCSS/DCS Technical Overview
- For the current ETSI Standard TS 103 236 Continuous Tone Controlled Signalling System (CTCSS) and Digitally Coded Squelch Signalling (DCSS) document, go to the ETSI Standards search page and search for ETSI TS 103 236.