Before revision: XTCSS XTCSS is the newest signalling technique, and provides 99 codes with the added advantage of "silent operation".
After revision: For those PMR446 radios with 121 codes, the codes are usually:+ DCS Code Tone Hz Code Tone Hz Code Tone Hz 39 023 67 174 95 445 40 025 68 205 96 464 41 026 69 223 97 465 42 031 70 226 98 466 43 032 71 243 99 503 44 043 72 244 100 506 45 047 73 245 101 516 46 051 74 251 102 532 47 054 75 261 103 546 48 065 76 263 104 565 49 071 77 265 105 606 50 072 78 271 106 612 51 073 79 306 107 624 52 074 80 311 108 627 53 114 81 315 109 631 54 115 82 331 110 632 55 116 83 343 111 654 56 125 84 346 112 662 57 131 85 351 113 664 58 132 86 364 114 703 59 134 87 365 115 712 60 143 88 371 116 723 61 152 89 411 117 731 62 155 90 412 118 732 63 156 91 413 119 734 64 162 92 423 120 743 65 165 93 431 121 754 66 172 94 432XTCSS XTCSS is the newest signalling technique, and provides 99 codes with the added advantage of "silent operation".