Vexa Max: Long-Range Hydroacoustic Modem
Distance covered
Capacity delivered
Vexa Max is an acoustic modem with the antenna gain and receiver sensitivity to extend reliable communication to 3000 m — compact enough for ROV and AUV payload bays.
What it does
- Bidirectional data transmission — the modem sends and receives digital data between underwater points up to 3000 m apart
- Dual transmission modes — the modem runs a transparent pass-through channel for raw data or packet mode with guaranteed, confirmed delivery
- Built-in ranging and depth sensing — the modem calculates distance from signal propagation time and reads depth from its built-in sensor, no external hardware needed
- Networked multi-unit access — the modem addresses individual subscribers on a shared channel and requests depth, temperature or supply-voltage readings from any unit in range
Distinctive features
- Ø64 × 62 mm, 360 g — a fit for ROV skids, sensor frames and diver harnesses
- 0.33 W receive, 15 W transmit — headroom for extended-range performance
- Four selectable baud rates, 78 to 634 bps — range-speed trade-off, set by the mission
- Full CDMA compatibility — shared addressing with Vexa Mini and Vexa Locator for mixed-fleet deployments
Some operations don't fit inside 1000 metres — deep survey transects, long tether-free ROV runs, sensor networks spread across a wide seabed. Vexa Max is built for the reach those jobs need. The same antenna platform as the rest of the family carries a signal three times as far as Vexa Mini — out to 3000 metres — in a body that grows to just Ø64 × 62 mm and 360 grams. That extra reach scales in capacity too: as many as 254 individually addressed subscribers can share the full 3000-by-3000-metre water area Max now covers. Run it as a transparent pass-through for raw data, or switch to packet mode when every message needs a confirmed delivery — the same choice every Vexa modem gives you. Three times the reach. A whole area's worth of capacity. One family, one protocol.
System components
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