28536
36
Zoom out
Zoom in
Previous page
1/40
Next page
Simrad SH40
The most common cause of acoustic noise is the propeller and
the cavitation caused by its rotation. Other typical noise sources
on board your vessels are winches, refrigerating plants, power
generators, pumps and cranes. If you experience problems you
thinkarecausedbynoise,trytond out which system that causes
the noise, and contact your dealer for advice.
Cavitation
As the propeller blades move through the water, low pressure
areas are formed as the water accelerates around and moves
past the blades. The faster the blades move, the lower the
pressure around it will become. As it reaches vapour pressure,
the water vaporizes and forms small bubbles of gas. This is
cavitation. When the bubbles collapse, they cause very strong
local shock-waves in the water. These may be audible and
can also damage the propeller blades. In addition to this, the
cavitation will generate very strong reverberation, commonly
seen as a red stripe of echoes behind the vessel.
If you have big problems with cavitation, try to adjust the
propeller pitch and/or the number of revolutions.
Reverberation
Reverberation is generated when the echoes from your sonar
transmission are reected not only by sh and objects in the
water, but also from the bottom and the sea surface.
(CD015005E)
B
A
The echoes from the bottom will vary with how uneven the
bottom is, what kind of bottom you have under your vessel,
(rock, mud, sand etc.) as well as your current tilt setting. The
echo from the sea surface will vary with the current sea state and
your current tilt setting.
The illustration demonstrates how the bottom and the sea surface
return echoes back to your sonar transducer. In situation (A) you
will see several weak echoes from the waves and from the rock on
the bottom, you will still be able to identify the school of sh. In
situation (B) you will be able to identify the upper school of sh,
but the lower school will be hidden in the shadow of the rock.
34
302656/A
36


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Simrad SH40 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Simrad SH40 in the language / languages: English as an attachment in your email.

The manual is 0,56 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info