Simrad ES70 - REFERENCE MANUAL REV A Reference Manual page 124

Simrad ES70
transceiver board (1 kW single beam) and -64.0 dBW for channels using four
boards (4 kW single beam, 4 kW split beam).
This mode is not designed for operational use of the ES70.
→ Receiver test on page 97
• : This column specifies the current duration of the transmitted pulse.
Pulse Length
You can manually select a different duration.
If you click , the ES70 will automatically select the best pulse duration for the
Auto
current operational mode, depth and bottom conditions.
The length of your transmitted pulse is very important to how you can detect fish.
A short pulse duration gives you a very fine vertical resolution. This allows you to
detect scattered fish, and you can find those that move near the bottom. A long pulse
duration throws a lot more energy into the water, and the digital filters used by the
receiver are narrower. These filters will reduce the ES70's sensitivity for noise, but
the length of the transmitted pulse will give you stronger echoes. With the filters, a
longer pulse duration will provide longer range, but reduced vertical resolution.
Table 3 Available pulse durations for given frequencies
64
12 kHz
18 kHz
27 kHz
38 kHz
50 kHz
70 kHz
x
120 kHz
x
333 kHz
x
710 kHz
The X-axis shows pulse durations in µS while the Y-axis shows frequency in kHz. "x" means that the pulse
duration is available for the given frequency.
• : This parameter displays and controls the transmitter's output power. Output
Power
power is limited either to the maximum rating of the transducer, or the maximum
rating of the transmitter, whichever is the smallest.
• : This is the depth of the transducer face relative to the water surface.
Depth
In order to measure correct water depth, the ES70 needs to know the vertical distance
between the vessel's water line and the transducer face. Enter this depth as a positive
number. For example, if the distance from the water line and down to the transducer
face is 3,5 meters, enter +3,5 m.
122
128 256 512
x
x
x x
x x x
x x x
x x x
x x x
x x x
1024 2048 4096
x x x
x x x
x x x
x x x
x x
x x
x
x
x
8192 16384
x x
x
x
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