Service Manual

SRM9000 SERIES SERVICE MANUAL
© TMC Radio 2006 page 18 TNM-U-E-0002 Issue 1
1.8.4.5 DCS
Data rate 134 bits per second, frequency modulated
7.46ms/bit
171.6ms per codeword continuously repeating
Deviation 0.5kHz for 12.5kHz systems
1kHz for 25kHz systems
Codeword size 23 bits comprising:
8 bits - DCS code (3 octal digits 000-777)
3 bits - Fixed octal code 4
11 bits - CRC (error detection) code
Available Codes 104 codes from 512 theoretically possible codes – see below
Turn off code 200ms 134Hz tone at PTT release
DCS Codes can be Transmitted “Normal” or “Inverted” (programmable).
The radio can Receive DCS codes in either Transmitted “Normal” or “Inverted” or both (selectable via
programmer).
Valid DCS Codes
023 132 255 413 612
025 134 261 423 624
026 143 263 431 627
031 145 265 432 631
032 152 266 445 632
036 155 271 446 654
043 156 274 452 662
047 162 306 454 664
051 165 311 455 703
053 172 315 462 712
054 174 325 464 723
065 205 331 465 731
071 212 332 466 732
072 223 343 503 734
073 225 346 506 743
074 226 351 516 754
114 243 356 523
115 244 364 526
116 245 365 532
122 246 371 546
125 251 411 565
131 252 412 606
1.8.4.6 C4FM
Digital speech format in accordance with TIA/EIA 102 requirements.