Chapter 5 Echo Menu; Echo Menu; Echosounder Operation - Simrad CX34 Manual

Echo menu

5. Echo menu
The ECHO menu and its related functions are only applicable with
built-in echosounder module and connected transducer, except sec-
tion 5.11 'Depth & temperature diagram' which applies to all models
in the CX34/44/54 serie.
1
50kHz (or 38kHz CX44/54)*
2
200kHz*
3
Dual Frequency (CX44/54)*
4
Depth & temperature diagram
5
Custom screen 1
6
Custom screen 2*
*) available with built-in Echosounder function.
Low and high frequency echosounder display can be set up sepa-
rately. The low frequency display will show deep water bottom
contours, and the high frequency display will show the mid-water
section with trawl targets or bait fish in a higher resolution.
The Dual Frequency display (CX44/54) will provide both the 50kHz
and the 200kHz echo displays in one screen.
The two custom screens will present multiple window combina-
tions (section 5.2), where one of the main echo displays i.e. 50kHz or
200kHz will be fixed in the left half of the screen. Adjustments can
be made individually to both displays (section 5.7).

5.1 Echosounder operation

The echosounder function of the CX34/44/54 determines the dis-
tance between its transducer and underwater objects such as fish,
lake bottom or sea bed. It does this by utilizing the fact that an ultra-
sonic wave transmitted through water travels at a nearly constant
speed of 4800 feet (1500 meters) per second. When a sound wave
strikes an underwater object such as fish or sea bottom, part of the
sound wave is reflected back toward the source. Thus by calculating
the time difference between the transmission of a sound wave and
3
ECHO
CX34/44/54 Operator manual
- see section 5.11.
Chapter 5-1