EvoLogics

Acoustics & Positioning

PRO USBL 48/78

PRO USBL 48/78 acoustic modem from EvoLogics, documented on the manufacturer model page for full-duplex S2C communication and underwater positioning.

The PRO USBL 48/78 transceiver is a PRO modem with a built-in USBL antenna for combined communication, navigation and positioning with EvoLogics S2C technology. It is documented for up to 31.2 kbit/s and up to 1000 m.

Product · Reference MOD-EV-PRO-USBL-48-78

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PRO USBL 48/78 official EvoLogics product image. — Official EvoLogics image for PRO USBL 48/78.

Benefits

PRO USBL form factor and configuration documented by EvoLogics.
Model-specific 48 - 78 kHz acoustic band.
Model-specific horizontally omnidirectional transducer pattern.

Applications

Subsea communication
Underwater positioning
ROV, AUV and sensor-network integration

Key features

PRO USBL form factor for mid-range underwater links.
48 - 78 kHz acoustic band with horizontally omnidirectional coverage.
Integrated USBL antenna for combined communication and positioning.

Technical overview

EvoLogics presents PRO USBL 48/78 as a distinct S2C modem model. Configuration, housing, depth and add-on choices remain quotation-dependent where the manufacturer marks them as options.

Technical details

General

Speed range: Fast short- and mid-range devices
Operating range: Mid-range
Transducer beam pattern: horizontally omnidirectional
Frequency band: 48 - 78 kHz
Acoustic connection: up to 31.2 kbit/s

Connection

Bit error rate: less than 10⁻¹⁰
Internal data buffer: 1 MB, configurable
Host interface: Ethernet or RS-232
Interface connector: Up to 4 connectors; Ethernet and serial combinations
Serial option: RS-232 can be replaced by RS-422 on request

Positioning

Slant range precision: 0.01 m
USBL bearing accuracy: 0.25 deg RMS
USBL nominal SNR: 10 dB

Power

Stand-by consumption: 2.5 mW
Listen mode: 5 - 285 mW; depends on settings
Receive mode: 1.4 W
Maximum output power: up to 60 W
Maximum transmit source level: 186 dB re 1 µPa @ 1 m

Power supply

External supply: 24 VDC or 12 VDC
Internal battery: Rechargeable NiMH or Li-ion battery, up to 342.8 Wh where configured

Housing

Operating depth: Delrin 200 m; aluminium/stainless steel/titanium/OEM build 2000 m
Reference dimensions and weight: Ø 110x218 mm; USBL antenna Ø 130x137 mm; total length 355 mm; 4500/500 g dry/wet

Configuration options

Cable-Mounted TransducerBuild type

The transducer connects to the modem unit with a cable for flexible placement away from noise sources.

Technical details: Wet-mateable connector; standard cable length 1.5 m, other lengths on request.

Applications: UUV platforms, sensor stations and infrastructure

Compatibility: PRO, PRO USBL, MINI and TINY

OEM-VersionBuild type

Housing-free modem build with separate electronics and a cable-mounted transducer for third-party integration.

Technical details: Optional wet-mateable connector; standard cable length 1.5 m, other lengths on request.

Applications: UUV platforms and integrated systems

Compatibility: PRO, PRO USBL, MINI and TINY

Internal AHRSPositioning

Built-in attitude and heading reference system measuring roll, pitch and yaw to compensate for vehicle motion.

Technical details: SBG Ellipse-A: 0.1 deg roll/pitch, 5 cm (5%) heave and 0.8 deg magnetic heading accuracy; Ellipse-E optional.

Applications: USBL tracking, UUV navigation and stabilized sensor measurements

Compatibility: PRO USBL

Wake-Up ModulePower management

Low-power sleep and wake-up control based on acoustic signals or data-interface input.

Technical details: Two-connector version is available for PRO and PRO USBL base models; not compatible with Ethernet interfaces.

Applications: Power saving for long-term deployments

Compatibility: PRO, PRO USBL, MINI and TINY

Advanced Timekeeping ModulePositioning / R&D

Precise modem timekeeping with 1 PPS input and optional CSAC or OCXO clock.

Technical details: Supports synchronized modem operation and precise timing for LBL and research applications.

Applications: Time synchronization, positioning and protocol research

Compatibility: PRO, PRO USBL, MINI and TINY

SDM ModeResearch and development

Firmware add-on for user-defined acoustic waveforms and configurable reference triggers.

Technical details: Complements the standard S2C protocol without removing base modem capabilities.

Applications: R&D on modulation and communication protocols

Compatibility: PRO, PRO USBL, MINI and TINY

Firmware SandboxResearch and development

Open developer environment for custom software running onboard while retaining modem functionality.

Technical details: GNU/Linux container based on Angstrom Distribution with scripting and C/C++ toolchain support.

Applications: Custom subsea applications and embedded integration

Compatibility: PRO, PRO USBL, MINI and TINY

Pressure SensorPositioning

Measures water pressure for depth information, positioning accuracy and sensor-data georeferencing.

Technical details: Available depth ratings 50, 100, 200, 500, 2000, 6000, 8000 and 10000 m; accuracy 0.05% of depth rating.

Applications: UUV navigation and georeferenced subsea data

Compatibility: PRO and PRO USBL

Power SwitchPower management

Supplies power to up to three external instruments and switches them by modem command.

Applications: Power management and remote control

Compatibility: PRO and PRO USBL

Acoustic Release DeviceRelease and recovery

Acoustic release mechanism for recovering submerged assets to the surface.

Technical details: Integrated or cable-mounted design; depth ratings down to 6000 m, full-ocean-depth option by special request.

Applications: Seafloor sensor stations and positioning nodes

Compatibility: PRO and PRO USBL

OptocouplerExternal instrument control

Software-configurable trigger pulse for external instruments activated by acoustic command.

Technical details: One or two outputs depending on add-on and connector combination; maximum current 10 mA.

Applications: Remote activation of sensors, actuators, lights and cameras

Compatibility: PRO and PRO USBL

Compatibility and naming

Before mid-2025, this model was offered as S2C R 48/78 USBL. EvoLogics states that the current model remains acoustically compatible with the existing 48-78 S2C devices.

Acoustic performance notice

EvoLogics states that listed bitrate and operating range are upper limits measured under optimal acoustic conditions. Actual performance depends on the environment, sound-velocity profile, ambient noise, multipath, installation and transducer placement.