Simrad EQ42 Specifications download pdf (Page 47)

EQ33 Principles of operation Chapter 8-1

8.1 Parts of an echosounder

An echosounder is composed of a display screen, processor, and transmitter/

receiver unit which in the case of the EQ33 are housed in one unit.

Connected to this unit by a shielded cable is the transducer, which is mounted

horizontally on the bottom of the hull or on the transom.

The display screen presents in graphic and numerical form the information

the processor is receiving and accumulating from the transducer.

The processor is the “brain” of the echosounder. It is sealed inside the unit

which protects it from harm. The processor is composed of highly sophisti-

cated microprocessor, memory and logic circuitry.

The transmitter/receiver (often called the “transceiver”) section of your

echosounder takes it’s commands from the processor. The processor tells the

transceiver to activate the transmitter. The transmitter sends a high voltage

transmit “ping” to the transducer mounted on the hull. At that point the trans-

mitter’s job is done and the receiver takes over (see fig.1 in section 8.2).

The receiver is also connected to the transducer and amplifies the very small

signals received as echoes from fish and the sea floor which arrive at the

transducer (see fig.2 in section 8.2). The receiver is designed to reject other

signals as much as possible and provide enough amplification to see even rela-

tively small targets at long ranges.

The amplified receiver signals are then send to the processor to be shown on

the display screen.

The transducer can be single or multiple ceramic elements in a rugged hous-

ing made from reinforced plastic, bronze or stainless steel. The transducer is

attached horizontally to the bottom of the hull. It is essential that the trans-

ducer be mounted properly, as echo transmissions are radiated at aright angles

from the transducer face. Shielded cables connect the transducer with the

echosounder.

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Simrad EQ42 Specifications Page 47