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Glossary
Terms the user guide uses. In the web version, hover over, focus or tap a dotted term in the text to see its meaning. The developer glossary (dev/glossary.md) has the protocol and hardware terms.
DMR
| Term | Meaning |
|---|---|
| All call | DMR talkgroup 16777215, heard by every radio on the slot. |
| AMBE+2 (AMBE) | DVSI's voice codec used by DMR. Not part of RadioFoundry. Taken from each radio's stock firmware. More |
| Call alert | A DMR page that makes another radio ring. |
| Color code (CC) | A number from 0 to 15 a DMR channel uses. Radios only hear calls with their color code. |
| Confirmed data | DMR packet data the receiving radio acknowledges. What didn't arrive is sent again. |
| DMR | Digital Mobile Radio, the ETSI digital radio standard (TS 102 361). |
| Hang time | How long after a call a repeater or radio keeps the call's talkgroup ready for a reply. |
| PI header (PI headers, PI) | A DMR header that announces encryption with a changing key. RadioFoundry never plays such calls. |
| Private call | A DMR call to one radio. |
| Radio check | A DMR request another radio answers automatically, to show it is on and in range. |
| SMS | Short message service: text messages. On DMR, short data carries them. |
| Talker alias | A short text, usually a callsign and name, sent along with DMR voice. |
| Talkgroup (TG, TGs) | A DMR group number. Everyone listening to it hears calls to it. |
| Timeslot (TS, TS1, TS2) | One of the two time slots of a DMR channel, TS1 and TS2. |
RF and hardware
| Term | Meaning |
|---|---|
| AM | Amplitude modulation: speech varies the carrier's strength. Airband uses it. |
| ANI | Automatic number identification: the caller's ID sent as tones in an analog call. |
| Bandwidth | The width of an FM channel: 12.5 kHz (narrow) or 25 kHz (wide). |
| CTCSS | Continuous tone coded squelch system: a sub-audible tone on FM that opens the squelch only for the right signal. |
| DCS | Digital coded squelch: a sub-audible digital code on FM that opens the squelch only for the right signal. |
| DFU | Device Firmware Upgrade: the USB protocol of the radio's bootloader. |
| DTMF | Dual tone multi frequency: the touch tones a keypad sends, in the audio. |
| Dual watch | Listening on two channels, A and B, and talking on the selected one. With one receiver the radio alternates between them. |
| FM | Frequency modulation: the analog voice mode. Speech moves the carrier's frequency. |
| GPS | Global positioning system: the satellite receiver that gives the radio its position. |
| LCD | Liquid crystal display: the radio's screen. |
| LED | Light-emitting diode: the radio's status light. |
| NMEA | The text format GPS receivers use to report position and time. |
| RF | Radio frequency: the signal in the air, as opposed to audio or data inside the radio. |
| RSSI | Received signal strength indicator: how strong the received signal is, in dBm. |
| RX | Receive. |
| SFR | Single frequency repeater. It repeats a call from one timeslot on the other timeslot of the same frequency. In MMDVM SFR the hotspot repeats, turned on by its host. In standalone SFR a channel set up in the codeplug repeats on its own, or talks through one. More |
| Split duplex | Transmitting on one frequency and receiving on another at the same time. Repeaters do, and so does the duplex hotspot setup. More |
| Squelch | The level a received signal must exceed before the radio plays it. |
| TOT | Transmit timeout: the longest transmission the radio allows. |
| TX | Transmit. |
| UHF | Ultra high frequency: 300 MHz to 3 GHz. The amateur 70 cm band is UHF. |
| USB | Universal Serial Bus. The radio uses it for the debug link, the network mode and firmware updates. |
| VFO | Variable frequency oscillator: tuning any frequency by hand instead of a stored channel. |
| VHF | Very high frequency: 30 to 300 MHz. The amateur 2 m band is VHF. |
| VOX | Voice-operated transmit. |
Vendor terms
| Term | Meaning |
|---|---|
| ARS | Automatic Registration Service: a radio tells a presence server it is on the air. |
| Basic privacy (Basic Privacy, Enhanced privacy, Enhanced Privacy) | A fixed voice scrambling from Motorola and Anytone radios. Not encryption. |
| Control station | A radio a dispatch program on a computer uses to reach the fleet over the air. |
| CPS | Customer programming software: the program that writes the codeplug. RadioFoundry uses qdmr. More |
| LRRP (LIP) | Location Request and Response Protocol: a dispatcher asks a radio for its position. Motorola's position format; the standard has LIP. |
| MOTOTRBO | Motorola's DMR product line. Its extensions (ARS, TMS, LRRP, Capacity Plus) are not in the ETSI standard. |
| TMS | Text message service: Motorola's text message format on DMR. The standard's own short data uses other formats. |
| TYT | A Chinese maker of DMR radios. |
Amateur and network
| Term | Meaning |
|---|---|
| APRS | Automatic Packet Reporting System: positions and short messages shared between amateur stations. More |
| BrandMeister | A worldwide amateur DMR network of linked servers and talkgroups. |
| CW ID | A station's callsign sent in Morse code. A standalone SFR repeater channel sends one in FM every few minutes after traffic (Settings > Talk & listen > SFR CW ID). More |
| DMR ID (RadioID, DMR IDs) | The number that identifies your radio on DMR. Amateur IDs come from RadioID.net. |
| Hotspot | A small DMR modem that connects radios nearby to a DMR network over the internet. More |
| iGate | A station that passes APRS packets between the air and the APRS-IS internet network. |
| KISS | A simple protocol between a computer's APRS program and a radio modem (TNC). |
| mDNS | Multicast DNS: finding a device on a local network by a .local name. More |
| MMDVM | Multi-Mode Digital Voice Modem: the modem protocol MMDVMHost speaks. More |
| rigctld | Hamlib's network rig control protocol, used by loggers and SDR programs. |
| SNMP | Simple Network Management Protocol: reading a device's state over the network. More |
| TFTP | Trivial File Transfer Protocol: a minimal way to copy files to and from a device. More |
RadioFoundry and firmware
| Term | Meaning |
|---|---|
| Codeplug | The radio's programming: channels, zones, contacts, talkgroup lists, DMR ID. More |
| Contact | A person in the codeplug: name and DMR ID. |
| CSV | Comma separated values: a table as plain text, as programming software exports it. |
| Digital monitor | Playing every talkgroup on the timeslot (promiscuous mode; "hear all" in older RadioFoundry builds). |
| ID | Identifier: a number or name that picks out one thing. |
| Listen list (RX group list) | The talkgroups a channel listens to. The codeplug calls it the RX group list. |
| Monitor | Opening the squelch (FM) or hearing all talkgroups (DMR) while a key is held. |
| OK | The key that selects or confirms. |
| One-shot | A talk target used for one call and its reply window. |
| PC | Personal computer. |
| PTT | Push to talk: the key that transmits. |
| qdmr | A free, open source codeplug editor for DMR radios. More |
| RadioFoundry | RadioFoundry, this firmware. |
| Recent | RadioFoundry's list of stations heard and calls made. |
| Reply window | The time after a call during which PTT answers it. |
| Stock firmware | The firmware a radio shipped with, before RadioFoundry. Each RadioFoundry radio takes its voice codec from it. |
| Talk target | Where PTT goes: a talkgroup, a person or all call. |
| Temporary change | A change that lasts until the channel changes or you press Back on Home. Hold OK to keep it. |
| UI | User interface: the screen, keys and menus. |
| YAML | A text file format. qdmr stores its codeplug as YAML. |
| Zone | A named list of channels. |