Simrad SP270 Installationshandbuch Seite 132

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Simrad SP 270
SPEED
BEARING
(KNOTS
1200
600 +600
+ 1200 + 1800
Table
Noise measurements
When the measurements are finished, make a plot of the noise
for 00
bearing into table 9. The noise level at full speed should
preferably not exceed the 0 dB line.
The noise/speed curve in table 9 can
give a picture of the ship
best search speed.
In case of very high ship noise level
, the RCG will
regulate the
receiver gain automatically down. This low gain
will then cause
a reduction in the receiving range.
To find
out if a high noise level is caused by flow noise of the
hull
or by the engine/propeller, make the test
described in the
following pages.
160573/A
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