5-16 DSM250 Digital Sounder Module
If, however, you wish to manually adjust the power to suit current
conditions, you can select either LO or HI power. LO power (100
W) is normally used in depth ranges less than 8 ft (2.4 m) and HI
power (600 or 1000 W, depending on your transducer) is typically
selected for depths greater than 12 ft (3.7 m).
➤ To change the power setting:
1. Press the MULTI key (MULTI knob on CRT radar units) to display
the soft key controls.
2. Press the POWER soft key to toggle between AUTO, LO, or HI
power. The selected setting is highlighted.
3. Press ENTER or CLEAR to return to the default screen.
Changing the Sounder Range
By default, the sounder automatically adjusts the display range,
selecting the shallowest range that keeps the bottom in the lower
half of the display window. Shift is disabled (the value is ignored)
when auto-range is selected.
Alternatively, the RANGE key lets you select the maximum depth
displayed on the scrolling bottom and A-Scope displays. You can
also set the shift value to move the image window up or down
within the current range.
The following range/shift values are available:
Table 5-2: Range and Shift Values
Feet Fathoms Meters
Range Shift Range Shift Range Shift
5 1 1 1 2 1
10 2 2 1 4 1
15 5 3 1 6 2
20 5 4 1 8 2
30 10 5 1 10 2
40 10 8 2 15 5
50 10 10 2 20 5
60 20 15 5 25 5
MULTI
POWER
AUTO
LO
HI
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