EQ42/50/52 Principles of operation Chapter 8
42
as echo transmissions are radiated at right angles from the transducer face.
Shielded cables connect the transducer with the echosounder.
8.2 How the EQ42/50/52 MKII works
When the EQXX is turned on, the processor
begins to send electrical pulses to the transducer.
The ceramic resonators 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
vibrations (sound waves) which are then
transmitted down through the water.
See Fig. 1.
Fig. 1 – Transmitted ‘ping’ from
the receiver/transmitter.
Echo from fish.
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 between the
disk surfaces. This voltage goes back up through
the cable to the receiver.
The EQXX processes the signals and presents
them on the display screen.
See Fig. 2.
Fig. 2 – Echo returning to the receiver.
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