Simrad ES60 - REFERENCE MANUAL REV H Reference Manual page 20

Transducer
120--25
ES120--7
50/200D
ES200--7
857-160970 / Rev.H
Frequency, Pulse
duration,
kHz ms
120 1.02
120 1.02
200 1.03
200 1.03
Typical observation ranges are shown in the figure. Using the
Simrad 27-26/21 transducer (27 kHz, 10x13 degrees, 3000 W)
you can observe a 60 centimeter cod down to 800 meters, and
bottom detection works down to 3800 meters. However, with
the Simrad 200-7F transducer (200 kHz, 7x7 degrees, 1000 W)
you can only observe that same cod down to 260 meters, and
bottom detection becomes unreliable below 500 meters.
These range calculations assume a normal sea water salinity
(3.5%) and temperature (+10 degC), an average bottom (surface
backscattering strength = -20 dB) and a noise level typical for a
moving vessel.
System description
Band Transmit
width, power,
Hz W
3026 1000
3026 1000
3088 1000
3088 1000
Range Range
fish, bottom,
m m
390 800
440 850
280 550
270 550
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