| UHF shared-channel multi-user, radiated | Yes | Two independent SDR transmitters; up to 12 catalogue identities recovered CRC-valid on air. |
| UHF bidirectional keyboard QSO | Yes | Lab antennas at 431.200 MHz; KISS + operator panel. |
| UHF continuous demod keep-up | Yes | uhf-live path; backlog-capped workers; offline keep-up <1× wall. |
| Operator web panel | Yes | TX inhibit, transcript, receiver health via --ui-port. |
| HF single-user via sound card | Yes | Real DAC/ADC path; intended HF deployment model. |
| HF realtime continuous RX | Yes | MOSAIC_HF_AUDIO narrow CFO search; keeps up with live audio. |
| HF multipath single-user (simulated ITU-R F.1487) | Yes | Measured Eb/N0 cliff; fading costs ~3 dB near threshold. |
| HF multi-user with ionospheric fading | No / limited | SIC residual from static gain over long packets; tracking work ongoing. |
| HF waveform on free-running UHF SDR LO | Partial | Acquires strongly; header decode fails (tone spacing vs drift). |
| On-air HF QSO | Not demonstrated | Requires a real HF transceiver in the loop. |
| Sub-second chat | No | Airtime is the floor (~2.6 s UHF / ~40 s HF packets). |
