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1.3 Transducer 520-5PSD, 520-5MSD
1.3.1 Mounting location
.The performance of this sounder is directly related to the mounting location of the
transducer, especially for high-speed cruising. The installation should be planned in
advance, keeping the standard cable length and the following factors in mind:
When the boat has a keel, the transducer should be at least 15-30 cm away from it.
Typical thru-hull mountings are shown in the figure on the next page.
Air bubbles and turbulence caused by movement of the boat seriously degrade the
sounding capability of the transducer. The transducer should, therefore, be located
in a position where water flow is the smoothest. Noise from the propellers also
adversely affects performance and the transducer should not be mounted nearby.
The lifting strakes are notorious for creating acoustic noise, and these must be
avoided by keeping the transducer inboard of them.
The transducer must always remain submerged, even when the boat is rolling,
pitching or up on a plane at high speed.
A practical choice would be somewhere between 1/3 and 1/2 of the boat's length
from the stern. For planing hulls, a practical location is generally rather far astern,
so that the transducer is always in water regardless of the planing attitude.
Dimensions of transducers 520-5PSD, 520-5MSD
22
24
120
120
68
68
87
30
28
520-5PSD
520-5MSD
All dimensions
in millimeters
Ship's
bow
10


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