Chapter 6
CVS-841/851
Using the menu
6.5.1.2 Output (Normal and Low)
This function increases or decreases the sounder power output in two steps, Normal and Low. In
normal operation, this setting should be set to Normal (High level). In case the need is arisen to
reduce the power, such as an inspection of acoustic power output, set the setting to Low (Low level).
Selections: Normal and Low
Initial setting: Normal
School of fish
The echo signal is
weakened due to power
reduction
Norma
l
Low
Figure 6.5 Reduction of output power
6.5.1.3 PRR (Pulse Repetition Rate)
This function changes the rate of transmission per minute. Using this function, you can eliminate the
false echo caused by other sounder’s transmission working on nearly the same transmission rate.
Selections: 1 (Fastest) – 10 (Slowest)
Initial setting: 1
2 10
Real echoes of
fish school
Figure 6.6 Reducing the interference
by changing the PRR
False echoes produced by
the transmission from
other sounder
Real sonar echoes
produced by own
sounder
1
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