Instruction manual

System description
3
850-164696 / A
1.3 Main units
The system can be expanded to include additional frequency
channels by adding General Purpose Transceiver (GPT) units as
required. Normally a EK60 scientific echo sounder system
consists of:
• One or more transducers
• One or more General Purpose Transceivers (GPT)
• A Processing Unit (computer) with ER60 and BI60 software
• A network to transmit data
A more detailed description of these main units include:
• Split beam transducers are available at frequencies ranging
from 18 to 400 kHz.
• Communication with peripheral sensors and systems include
Navigation, Motion, Trawl sensor inputs, Datagram output
and Remote control.
• The General Purpose Transceiver (GPT) contains transmitter
and receiver electronics. The receivers are designed for low
noise, and they can handle input signals spanning a very large
instantaneous dynamic amplitude range of 160 dB. All
targets are correctly measured and displayed.
• A twisted pair Ethernet cable connects the General Purpose
Transceiver (GPT) with the computer. The distance between
the computer and the GPT can extend up to 100 meters.
• If more than one transceiver is used, a small Ethernet switch
is required to connect the General Purpose Transceivers to
the computer.
• The majority of the echo sounder functions are implemented
in software. The bottom detection algorithm is implemented
solely in software with separate computation for each
frequency channel.