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Simrad SN90 Operator Manual
Setting up the SN90 in a synchronized
system
Topics
About synchronization, page 148
Synchronization modes, page 148
Synchronization using Clear To Send (CTS) and Request To Send (RTS) signals, page 149
Synchronization sequences, page 150
Selecting synchronization port, page 151
Selecting synchronization mode, page 152
About synchronization
Whenever more than one hydroacoustic system are installed on a vessel, interference may
occur. With only two systems, interference can be avoided if one of the hydroacoustic
systems can control the transmissions of the other system. If multiple systems are
used, they can be connected to a common synchronisation system that controls all the
transmissions.
In physics, interference is the phenomenon in which two waves superpose each
other to form a resultant wave of greater or lower amplitude. Interference usually
refers to the interaction of waves that are correlated or coherent with each other,
either because they come from the same source or because they have the same or
nearly the same frequency. Interference effects can be observed with all types of
waves, for example, light, radio, acoustic, surface water waves or matter waves.
https://en.wikipedia.org/wiki/Interference_(wave_propagation), April 2016
The Simrad SN90 may be set up to be synchronized with other hydroacoustic instruments.
Synchronization is necessary to prevent several hydroacoustic systems from transmitting
simultaneously. Individual transmission is often a necessity to prevent interference.
Related topics
Setting up the SN90 in a synchronized system, page 148
Synchronization modes
The purpose of the synchronization modes are to set up the SN90 to operate alone, or as
a "master" or "slave" in a synchronized system.
Whenever more than one hydroacoustic system is installed on a vessel, interference may
occur. To avoid interference, you have these options:
148
381295/B
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