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Furuno WMB-3250 Wassp Manual

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Doc. P/N: WSP-009-004
Version: V1.3
Issue Date: August 2013
www.wassp.com
Page 55 of 62
Operator Manual
7.6 What is this constant signal on the sonar/single beam display?
There are many sources of noise, interference and general acoustic reections which can make
these displays difcult to use. A description of the different types of noise and ways in which you
might be able to determine and eliminate them follows.
Sonar/Sounder
– Other Sound producing devices will produce constant blips on the WASSP
sonar display which will vary in intensity and size depending on the transmission power and
angle of the system.
Aeration
– Air in the water around the transducer can cause transmitted signals to be absorbed
or reected prematurely resulting in false signal reports from the transducer.
Biomass
– Large bodies of photo plankton can oat through the sea covering very large areas.
This may be the source of large areas of constant faint signal return through a region of the
water column.
Own Transmission
– WASSP shows all received signals starting from half way through the
transmission pulse. Thus you should see a red or yellow ring at the top of the Sonar display. As
power level and pulse width increase this signal return will be stronger and larger.
Keel Reection
– If the WASSP system is mounted in such a way that transmitted signals can
reect off the ships hull you may nd that there is a constant strong return shown on the sonar
display. This may happen even if the hull is just outside the 120 º transmission swath. If a strong
signal follows the boat and is within the dimensions of the ship then this signal is probably a
reection off your own ship. This will make it hard to detect sh at this depth but otherwise
shouldn’t affect the performance of your WASSP system.
Electrical
– There are an almost innite number of ways in which Electrical Noise can inuence
system performance. The rst priority is that the system be well grounded – this means a large
and preferably short grounding wire connects the Transceiver to the Power supply ground.
WASSP is relatively protected by noise on Power supply sources but a very noisy supply could
cause trouble. More likely causes of electrical interference are if noisy, high power machinery or
wiring is run beside the transducer cable. Electrical noise is either constant, regular or transmit
power dependant.
Water Temperature Layers
– A thin faint horizontal line that is present ping after ping in the
same place could be a temperature layer. The Sea is often layered with various temperature
layers due to pressure and surface mixing. Often a reection can be created at the depth where
a signicant change in water temperature occurs – causing an acoustic return.
Prop Noise
– If the turbulent water ow off the props is directed onto the transducer face this
could create aeration noise. Especially relevant for lower frequency models – it may be possible
to pick up the prop noise as an acoustic source. For this reason it pays to mount the transducer
some distance from the ships props. Prop acoustic noise will appear on the side of the Sonar
display close to the prop and will look like a regular pulse or solid signal depending on the
rotation speed.
Vibration
– Shudders of vibration and vibrating mounting structures can induce signicant noise.
Additionally a vibration in mounting can cause motion compensation of the system to fail. Sharp
jolts and vibrations will generate rings of high signal.
7.7 Why is my WASSP System not tracking the seaoor?
Any source of noise mentioned in the answer to “7.6 What is this constant signal on the sonar/
single beam display?” above can cause the seaoor detection to fail if it is bad enough. In
some cases bad noise can cause the tracking to fail and it could take a number of pings for the
WASSP system to re-acquire the seaoor. In some instances noted below and in bad cases of
… 55 …


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