Turn it on and hear
what is on the air.

Decoding and analysis of DMR frame structures: burst synchronisation, control signalling, headers and data blocks, and the network, device and position information they carry. It works in Tier II and on trunked systems. Following the calls happens on Tier III alone, which is in beta for now and untested against real traffic: VFO 1 then holds the control channel, every call gets a VFO of its own, the logical channel map survives between sessions, and filters pass only the traffic you are after. Capacity Plus, Connect Plus and Hytera XPT are recognised and written to the log, but not followed. The program organises the events, keeps aliases for talkgroups and radios, and saves the data to the logbook. The program contains only a decoding engine: it does not break, guess or bypass encryption keys. Playing back the audio requires the correct key to be entered by hand by the user, who answers for whether they may listen to that traffic.

Decoding and analysis of TETRA frame structures: the synchronisation burst, what each slot carries, the broadcast cell parameters and the link-layer signalling, plus a log of the raw blocks in hexadecimal. The view shows detected networks and the state of reception. The ETSI codec tables are loaded by the user, because they are not in the program, and keys are entered by a user authorised for that traffic.

The program can transcribe speech from everything it plays: analogue FM/AM/SSB as well as decoded DMR and TETRA voice. Recognition runs entirely locally, on a model built into the executable; nothing is sent to the network. The log can be filtered and exported to CSV, and a vocabulary (for example the phonetic alphabet or aviation terms) improves accuracy. Transcription is not error-free: it needs a very clean and clear signal to work properly, and noise, fading and overlapping conversations all reduce its accuracy. The recognition model can be swapped for a larger one when the computer can carry it.

The recognised text can be translated into any supported language, also without an internet connection. The translation appears next to the original, in a separate log column, and likewise stays on your machine.

The engine, the speech model and the translation packs are embedded in the program and loaded straight from memory, with no loose files beside it. The interface is nineteen pages in the sidebar plus four tool windows opened from the DMR page, along with colour themes, three languages, a collapsible sidebar and a full-screen mode. Pages and the waterfall can be torn off into their own windows and spread across a second monitor.

The map takes more than two and a half thousand MIL-STD-2525 and APP-6 symbols, plus routes with bearing and distance, circles, measurements, drawings and notes, spread across separate layers. The coordinate grid is drawn in DD, DMS, UTM, MGRS or the QTH locator, the view can be tilted, and the whole thing saved to PNG or PDF. A recording, a piece of the transcript or a log entry can be attached to any point.

The SSTV decoder handles fifteen modes: Martin M1 and M2, Scottie S1, S2 and DX, Robot 36 and 72, Wraase SC2-120 and the whole PD family from PD50 to PD290, including PD120, the mode the International Space Station transmits in. The picture builds line by line on a page of its own, and finished receptions go to an album. They are written to disk on their own only once “Save every image” is turned on, as it is off by default.

Both modes are decoded from the same audio, with no choosing which one you are listening to, and every result is labelled with which it was. The table shows the UTC time, signal-to-noise ratio, time offset, frequency and the message itself, with CQ calls picked out. The program reads many stations at once, including overlapping ones: once one is decoded it is subtracted from the recording and weaker ones are looked for underneath. Beside it stands the QSO map: stations from the locators given in the messages, each contact as a great-circle line with an arrow to the far station, FT8 and FT4 in different colours, CQ callers in green. Coastlines and borders are built into the program, so this map works with no internet and no map key.