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FAQs
Operation
Q)
What would you consider a good place to start with the gain Controls?
A)
I start with the Near Gain 5, the Far Gain 7, and the Overall Gain 7. Fine tune the Near Gain
so objects close to the towfish look good. Next, adjust the Far Gain so objects farthest from the
towfish look good. Finally, use the Overall Gain to adjust the overall darkness or lightness of the
image.
Q)
How do I adjust to compensate for a bottom that slopes away or towards the transducer?
A)
The transducers produces a fan shaped beam that is 40 degrees in the vertical plane. This
allows the Side Scan Sonar to scan gently sloped bottoms minor adjustments. For bottoms that
slope gently away from the scanning head, you can compensate by raising the far gain. For bot-
toms that slope gently up towards the scanning head, you can compensate by lowering the far
gain.
Q)
Some of the images are clearly vehicles, while others only show a large, undefined shape.
A)
This is normal. When performing a search, it is important to remember that objects will not
always be displayed as you would expect. The orientation of the target in relation to the scanning
head can make a big difference in the how the sonar "sees" the target. Changing the orientation
of the scanning head in relation to the target will change how it appears on the display.
Q)
Will I still be able to see small objects on the longer range scans?
A)
The 25 meter plus ranges are best when searching for larger objects. Small objects are
often overlooked due to their small size when drawn on the screen. On a 21", monitor, a 3ft length
object measures only ¼", which is very easy to overlook. To thoroughly search an area for a small
target (body), you will need to perform several shorter range scans. The 5 meter and 10 meter
ranges are best for small target searches.
Q)
How do I get the update of JW Fishers Sonar View Software?
A)
Contact JW Fishers for information on software updates.
PH (800) 822-4744
PH (508) 822-7330
E-MAIL: jwfishers@aol.com or info@jwfishers.com
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