About

How YSF Live works

YSF Live is a community-driven, English-forward directory that helps System Fusion operators find reflectors with recent activity.

Passive monitoring

The service joins listed YSF reflectors as a lightweight metadata listener. It observes standard network frames to determine whether a reflector is active and which callsign was decoded most recently. It never records voice audio.

Activity labels

Traffic now means traffic was observed within the last few seconds. Active recently means traffic was observed within the recent activity window. These labels are estimates and may lag during network interruptions.

Search

Search is intentionally reflector-focused. It matches reflector names, YSF IDs, descriptions, countries, and regions. It does not search for operators by callsign.

YSF, System Fusion, WIRES-X, and FCS

Yaesu System Fusion is a digital-voice radio system that uses C4FM. WIRES-X is Yaesu's network for linking compatible nodes and rooms. YSF and FCS are reflector systems commonly reached through compatible hotspots and gateways. YSF Live lists public YSF reflectors; it is not a WIRES-X room directory and is not affiliated with Yaesu.

Availability and uptime

Availability checks are limited protocol-level probes run about twice per day. A successful check means the reflector returned a valid YSF response at that time. The 24-hour uptime percentage is calculated from checks recorded during the preceding 24 hours and is not a service-level guarantee.

Community corrections

Reflector information may come from public host lists and automated classification, so mistakes are possible. Corrections and reflector-owner opt-out requests are welcome at [email protected].