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Model 77 Series

Model 77 Series
  • DUAL FREQUENCY
  • 30 LF / HF COMBINATIONS
  • FISHING, NAVIGATION & SURVEYING
  • HULL MOUNTING
  • LOW SIDE-LOBES
  • ROBUST NYLON HOUSING

The 77 SERIES hull-mounted dual frequency transducers offers both high and low frequency sections combined in a single unit. 

The ability to specify a wide combination of frequencies in the same basic unit provides the echo sounder manufacturer and hydrographer with the flexibility to select a system to meet the desired survey requirements of resolution, range, silt penetration and beam pattern. 

The high impact strength nylon body provides a mechanically robust and corrosion free transducer. 

The 77 SERIES is available with or without acoustic calibration which is traceable to National Standards. Transducer impedance can be adjusted to suit customers specification – see specification tables below.

Technical Specification

Resonant Frequency (Nominal)
  • 24/200 kHz (Other frequency options available, download datasheet)
Beam Pattern
  • 23 Degrees Conical @ 24 kHz
  • 8 Degrees Conical @ 200 kHz
Bandwidth
  • 2.5 kHz @ 24 kHz
  • 15 kHz @ 200 kHZ
Transmit Sensitivity
  • 167 dB re 1μPa/V 1m @ 24 kHz
  • 170 dB re 1μPa/V 1m @ 200 kHz
Receive Sensitivity
  • -173 dB re 1V/μPa @ 24 kHz
  • -193 dB re 1V/μPa @ 200 kHZ
Nominal Impedance
  • 75 Ohms @ 24 kHz
  • 70 Ohms @ 200 kHz
Transmit Voltage / Duty Cycle (Max)
  • 300 Vrms at 10% @ 24 kHz
  • 150 Vrms at 10% @ 200 kHz

Mechanical Specification

Storage Temperature
  • -40 to +80 °C
Cable Type
  • Ø12mm Polyurethane Jacket, Screened 4 Core
Operating Depth
  • 300m Standard
Cable Length
  • 10 metres standard
  • (Additional lengths supplied to order)
Weight Air/Water (including 10m cable)
  • 10.4 kg / 3.6 kg
Connector
  • Not fitted as standard
  • (Optional Customer Specific)
Operating Temperature
  • -5 to +40 °C

Our Company

Formed in 1990, Neptune Sonar is now a leading company in underwater transducer technology, offering one of the world's largest and most comprehensive range of undersea defence and commercial transducers.

Based in the UK, our research and manufacturing operation is located on a 25-acre site in East Yorkshire. With a 60,000 square metre trials lake and a floating calibration laboratory, the site provides an extensive range of facilities supporting every aspect of acoustic transducer development from modelling and design to final product acceptance.

Neptune Sonar Limited
Kelk Lake
Kelk
East Yorkshire
YO25 8HG

T: 01262 490234
E: sales@neptune-sonar.co.uk
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We design, manufacture and test acoustic sensors and electronics for...

  • Naval Defense
  • Maritime Security
  • Offshore Oil & Gas
  • Hydrographic Survey Industry
  • Oceanographic Science
  • Environmental Sectors
  • Aquaculture