Simrad ES70 - INSTALLATION REV A Installation Manual page 22

Simrad ES70
Figure 5 General Purpose Transceiver (GPT)
The General Purpose Transceiver (GPT) is a small self-contained unit containing its
own power supply. It operates on +12 Vdc or 115-230 Vac. The unit can in principle be
mounted anywhere on board the ship, provided that the location is dry and ventilated.
Make sure that ample space is provided in front of the unit to allow for maintenance and
parts replacements. Power cable and mounting brackets are enclosed. We recommend
that the GPT is mounted as close to the transducer(s) as possible.
An Ethernet link connects the General Purpose Transceiver to the Processor Unit
(computer). This link may comprise a standard Ethernet cable and - if necessary - an
Ethernet switch. The transceiver includes its own Ethernet interface. A network interface
board must be fitted to the computer.
A single frequency General Purpose Transceiver accepts one echo sounder transducer,
while a dual frequency transceiver accepts two transducers.
The General Purpose Transceiver is available in single beam and split beam
configurations. A dual frequency single beam configuration is also provided. The
possible operating frequencies are listed in the technical specifications. Typical
configurations include:
• GPT-S38(4)-F (single beam 38 kHz, 4 kW)
• GPT-S50(4)-F (single beam 50 kHz, 4 kW)
• GPT-S70(1)-F (single beam 70 kHz, 1 kW)
• GPT-S120(1)-F (single beam 120 kHz, 1 kW)
• GPT-S200(1)-F (single beam 200 kHz, 1 kW)
• GPT-Q38(4)-F (quad (split) beam 38 kHz, 4 kW)
• GPT-Q120(4)-F (quad (split) beam 120 kHz, 4 kW)
• GPT-S38(1)/S50(1)-F (single beam 38 and 50 kHz, 1+1 kW)
Two or more General Purpose Transceivers can exist on the same Ethernet cable. A
multi-frequency sounder emerges simply by using several transceivers on the Ethernet
cable.
Example: A dual frequency split-beam sounder emerges by connecting two split-beam
transceivers to the Ethernet cable.
Example: A triple frequency single-beam sounder emerges by connecting three
single-beam transceivers to the Ethernet cable.
Note that for certain operational frequencies, the General Purpose Transceivers is set up
using an external power supply.
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