experience an operational failure, it is recommended that all repair services
be provided by an authorized Raytheon service dealer or by the Raytheon
Factory Service Center.
Before proceeding, please take a few moments to fill out the Warranty
Registration
Card
located behind the front cover of this manual. Then
return the card to Raytheon Marine Company. No postage is required
card is mailed in the U.S.A.. This card must be returned to assure the
registration of the warranty for your unit.
1.3
ECHO SOUNDING GENERAL INFORMATION
An echo sounder is a device which trans-
mits an ultrasonic energy wave into the
water; listens for echoes from that ultra-
sonic wave and then displays the returning
echoes onto the LCD panel or CRT video
display. The elapsed time that it takes for
the pulse energy to travel down through
the water and be reflected back as echoes
can be measured and converted into units
of depth in the echo sounder.
TRANSDUCER
ENERGY WAVE
The frequency of this “ultrasonic” wave, the beam angle at which it is
transmitted, and the power at which it is sent will all play
an
important part
in determining the appearance of the echoes on the display.
The normal components of an echo sounder are a display unit containing
the electronic circuits, and a transducer for sending and receiving the sonic
energy. The echo sounder is one of the most useful pieces of electronic
equipment aboard a boat. In addition to indicating the depth of the water,
it can indicate whether the bottom is hard or soft, smooth or irregular in
contour and
fish are present below the boat.
Echo returns from the bottom, from fish or fish schools, seaweed, grass,
bubbles, or plankton are received by the echo sounder in various echo
strengths. The bottom echo is usually the strongest echo return while
returns from fish are generally very weak. In color echo sounders, such as
the
these different echoes are displayed in distinct colors (up to 16
colors can be used) for easy recognition by the operator. Whether fish
INTRODUCTION 3
