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THEORY OF OPERATION
Your depth sounder works on the sonar
principle. The control head generates an
electronic signal which is coupled to the
transducer where it is changed to an
ultrasonic signal. This signal travels through
the water until it hits an object or the lake
bottom. The signal is then reflected back to
the transducer, where it is changed back to
an electronic signal.
The control head measures the amount of
time it takes the signal to travel from the
transducer to the reflecting object and back
again. This time is then converted into feet
(since the signal travels at a constant speed -
approximately 4800 feet per second), and the
number of feet to the object is indicated on
the calibrated dial with the spinning lamp.
The lamp revolves around the dial once for
each 120 foot reading on the 120 foot units
and once for each 60 foot reading on the 60
foot units. Therefore, the motor in the 120
foot unit rotates at 1200 rpm and in the 60
foot unit 2400 rpm. The motor in the Super
Thirty II unit also travels at the speed of 2400
rpm. This is accomplished by the use of an
integrated circuit signal processor which
permits a 30 foot readout to be displayed on
a unit running at the speed of a 60 foot
model.
YOUR TRANSDUCER
The transducer is the transmit/receive "antenna" of your depth sounder. The transducer converts
an electrical signal from your instrument into accoustical energy which is then transmitted through
the "eye" of the transducer into the water. The return signal (echo) excites the "eye" with an
accoustical shock wave and causes the transducer to send an electrical signal back to your
instrument. The "eye" of the transducer is the flat portion that is focused downward into the water.
For maximum efficiency the transducer's "eye" must not be obstructed and it must be in intimate
contact with the water ("wetted'').
It is suggested you keep the face of the transducer clean. This can be done with soap and water.
NOTE: In order for your Humminbird to perform at Its maximum potential, care should be taken to
Install the transducer properly. This Is the most critical part of the Humminbird Installation. Please
read the following sections thoroughly and follow the installation instructions carefully.
TRANSDUCER MOUNTING OPTIONS