Chapter 8-2 EQ33 Principles of operation
8.2 How the echosounder works
When the EQ33 is turned on, the processor begins to
send electrical pulses to the transducer. The ceramic
resonator in the transducer has a special property
which enables it to change dimensions slightly when
a varying voltage is applied.
The voltage is thus converted to mechanical vibra-
tions (sound waves) which are then transmitted down
through the water.
See Fig. 1.
Fig. 1 Transmitted ‘ping’
from the transmitter/receiver.
The sound waves move through the water until they
encounter a change in density, such as a fish or the
bottom. This causes the sound waves to ‘echo’ back
up through the water. When the reflected sound
waves (echoes) hit the transducer, the ceramic disk
vibrates at the same frequency. This generates a
varying voltage which goes back up through the
cable to the receiver.
The EQ33 processes the signals and presents them on
the display screen.
See Fig. 2.
Fig. 2 The up arrow indicates:
Echo returning to the receiver.
The down arrow indicates:
Transmitted pulse.
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