Table of Contents
Advertisement
Simrad SN90
Using SN90 on trawlers
Trawlers have for many years relied on high resolution echo sounders - such as the
Simrad ES70 - to find and estimate their catch. The disadvantage with echo sounders
is the fact that they look straight down.
The SN90 offers the high resolution
of an echo sounder, but also a
large horizontal range that allows
you to find fish - even close to the
bottom - from a distance of several
hundred meters. The high frequency
bandwidth makes the SN90 ideal for
species like pollock, cod and saith.
During the search phase, a forward
looking SN90 is a very efficient
tool for all trawlers. Since the
transducer is placed in the vessel's
bow, the SN90 will not suffer from
the acoustic noise generated by the
hull, machinery and propellers.
The physical installation angle of the
transducer must be determined based
on the depth in the vessel's normal
fishing waters. Even with a fixed installation angle, the SN90 will serve well in other
waters too due to the swath and tilt functionality.
Specifications and functionality
The Simrad SN90 is a unique sonar, both in design and functionality.
The composite transducer and the transceiver each uses 256 individual channels for
transmission and reception. A large frequency bandwidth is supported, as the SN90
allows you to choose a 0.1 to 40 kHz bandwidth with centre frequency from 70 to 120
kHz in steps of 1 kHz. The bandwidth can be set up individually for each sonar view.
13
381295/B
Advertisement
Table of Contents
