Kongsberg Simrad CP200-5C, Installation Manual

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In some areas, where many vessels operate together, the engine and propeller noise from
other vessels may be disturbing. Interference from hydroacoustic instruments located in
other vessels may also be a limiting factor. The sea noise depends on the weather conditions.
In bad weather the sea noise can be quite high due to the waves.
Related topics
Preparations, page 22
Acoustic noise, page 45
Fishing gear noise
Whenever your fishing gear is in use, it will create noise.
A bottom trawl, for instance, is a considerable source of acoustic noise. Still, this noise from
the fishing gear will seldom be a limiting factor for hull mounted sonars or echo sounders.
However, for operation of a catch monitoring system or a trawl sonar, with the transducer
placed on the trawl, the gear noise is one of the main contributors to the noise level.
Related topics
Preparations, page 22
Acoustic noise, page 45
Electrical self noise
Electrical or electronic self noise is picked up or generated in any other part of the equipment
than the transducer.
The most common source of electrical self noise is hum. The hum is normally generated by
a low quality power supply. It is then picked up by the transducer cables and/or sensitive
electronic circuitry. At higher frequencies – where rather wide bandwidths are necessary –
the noise from components, transistors or other analogue electronic may be a limiting factor.
Related topics
Preparations, page 22
Acoustic noise, page 45
Simrad CP200-5C Installation Manual