Tools · Abbreviations
Abbreviations
Shorthand used on Cross Reference UK listings, forum posts, and keeper pages. A colour code is not a CTCSS tone; a talkgroup is not a frequency; an 8.33 channel number is not always the carrier. If a submission leaves these blank, we would rather publish an empty field than a guess.
For the operating picture, see the guides — especially amateur digital voice notes and the 8.33 converter.
| Term | Meaning |
|---|---|
| ATIS | Automatic Terminal Information Service — looped airfield weather/runway info, AM airband. |
| CC | DMR colour code (0–15). Must match the repeater or you hear nothing useful. |
| CTCSS / DCS | Analogue squelch tones. CTCSS is a sub-audible tone; DCS is a digital code. |
| DMR | Digital Mobile Radio. Two time slots on one 12.5 kHz channel; talkgroups sit on a slot. |
| D-STAR | Icom digital voice/data. Modules (A/B/C) label 23 cm / 70 cm / 2 m on a gateway. |
| NAC | Network Access Code on P25. Hex value the radio must match. |
| NFM | Narrow FM — typical for amateur 12.5 kHz channels and PMR446 analogue. |
| NGR | Ordnance Survey National Grid Reference (e.g. TQ 082 769). Converted from lat/long on listings. |
| NXDN | Narrow digital voice (Icom/Kenwood). RAN is the radio access number. |
| P25 | APCO Project 25 digital voice. Common on some imported gear; NAC matters. |
| PMR446 | Licence-free 446 MHz handheld allocation in the UK/EU. |
| RAN | NXDN Radio Access Number, analogous to a colour code. |
| TG / TGID | Talkgroup identity on DMR/NXDN. Local, regional and network groups differ. |
| TS | DMR time slot 1 or 2. |
| USB | Upper sideband — used on HF amateur and some HF VOLMET. |
| VOLMET | Met broadcast for aircraft, often HF USB as well as VHF. |
| 8.33 | 8.33 kHz VHF airband channel spacing. Channel display ≠ always the true frequency. |