Simrad SP70
152
851-164336 / D
Speed
(Knots)
Bearing
(Knots)
--120
°
--60
°
0
°
+60
°
+120
°
+180
°
0
2
4
6
8
10
12
14
Table 8 Noise measurements
8
When the measurements are finished, make a plot of the
noise for 0 degrees bearing into the
Noise speed plot
.
- The noise level at full speed should preferably not exceed
the 0 dB line.
→
Refer to the plot provided on page 154.
This noise/speed curve can give a picture of the ship’s best search
speed.
Problems with flow noise
In case of very high ship noise levels, the
RCG
function will
automatically regulate the receiver gain down. This lower gain will
then cause a reduction in the receiving range.
To find out if this high noise level is caused by flow noise from the
vessel’s hull or by the engine/propeller, perform the following test.
1
Enter the noise level for 0 degrees bearing from the
Noise
measurements
table into the column for
Stable speed
in the
Noise verification
table.
→
The Noise measurement table is given as table 8 on page
152.
→
The Noise verification table is given as table 9 .
2
From 0 knots, give full engine thrust, and make a readout of
the noise level for
Acceleration
when the vessel reaches
each of the listed speeds. Enter the readouts into the table.
3
From full speed, reduce the engine thrust for minimum
speed, and make similar readouts for
Retardation
.
Summary of Contents for Simrad SP70
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