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Transceiver Unit description
The SN90 transceiver is provided to transmit the acoustic energy into the water. To do
this, the transceiver computes and generates the electric signals sent to the transducer to
form a transmission - a 'ping'. After each transmission, it will receive the echoes from
the targets in the water column and/or the seabed. These are filtered and amplified, and
then converted to digital format.
The SN90 Transceiver Unit is located in the sonar
room. It is mounted on the bulkhead using powerful
shock absorbers. The physical distance to the
transducer is limited by the length of the transducer
cables.
The Transceiver Unit handles the transmission and
reception control of the 256 transmitters and 256
receiver channels. Eight identical transceiver boards
are used. The unit also holds a power supply, an
Ethernet switch, and a large capacitor bank.
An Ethernet cable is used for communication with
the Processor Unit on the bridge.
The transducer cables are plugged into the side wall of the Transceiver Unit cabinet
using a special multi-connector. The connectors for power and interfaces are located at
the bottom of the cabinet.
Note
To extend the lifetime of the SN90 Transceiver Unit, it must be mounted at dry and
clean location with sufficient ventilation.
Observe the sonar room requirements.
Related topics
System diagram, page 18
Installing the Transceiver Unit, page 123
Location of the mounting brackets, page 126
Installation of the mounting brackets, page 127
Transceiver Unit grounding, page 128
396280 Transceiver Unit outline dimensions, page 220
Interface specifications, page 248
Weight and outline dimensions, page 249
Power requirements, page 251
Environmental requirements, page 253
Summary of Contents for Simrad SN90
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