Installation manual

System familiarization

850--160137 / A

The computerized electronic unit is located in the bottom

section of the console, and performs the following functions:

· Interfacing of the control panel

· Interfacing external connections (log, gyro, etc.)

· Generating the total display presentation

· Generating the audio of the echo signal

· Controlling theseriallinecommunicationtothetransceiver

Theloudspeaker,whichismountedinsidetheelectronicunit,

reproduces the audio of the echoes for the selected audio

channel.

2.3 Transceiver Unit

The Transceiver Unit is located in the sonar room, close to the

Hull Unit. The unit contains the following modules, seen from

the left--hand side in figure 3:

· Eight equal transceiver boards (TRB--32)

· Signal processor board (SPB--31)

· Transceiver Interface Board (TIB)

· Power supply

· High voltage unit

The Transceiver Unit performs most of the main functions

of the SD 570 sonar:

· Receivesthe operator settings fromthe Sonar ControlUnit.

· Generates the high voltage for the 256 transmitters

· Controls the transmission with a total of 256 separate 57

kHz transmitters

· Controls the total gain and data acquisition of the 256

separate preamplifiers

· Performs the digital beamforming of the received signals

· Executes the FM (Frequency modulation)

· Accomplishes the postprocessing (detection, AGC/RCG and

ping--to--ping correlation)

· Transmits the received echo data to the Sonar Control Unit

The 256 transducer elements on the Hull Unit are connected

directly to the front of the eight transceiver boards in the

Transceiver Unit.