386619/C
37
Related topics
Basic operating procedures, page 36
Selecting operating frequency for minimum noise
The
Frequency
function is used to control the centre frequency of the acoustic transmissions
(pings). The centre frequency can be changed from 20 to 30 kHz in steps of 1 kHz. All types
of noise matter when you wish to find the best operating frequency.
Context
A lower frequency gives you a better detection range because the attenuation loss is smaller.
A higher frequency gives you better range resolution. A higher frequency also gives you
narrower beams and a "sharper" image".
Noise from internal and external sources have an impact on the choice of operating
frequency. One specific frequency may perform better than the others on your vessel. To
measure the noise level, observe the value presented on the
Noise
page in the
BITE
dialog
box.
We recommend that you do this test twice. First, do the test with all other hydroacoustic
systems (echo sounders, ADCP, sonars) turned off. Second, do the test with normal
operating conditions. This allows you to see how the other hydroacoustic systems affect
the SX90 operation.
Procedure
1
On the
Main
menu, select
User Settings
.
a
Select
SX90 Factory Default
.
b
Select
Activate Selected Setting
.
c
Select
OK
to apply your changes and close the
User Settings
dialog box.
2
On the
Main
menu, set
Range
to
1000 m
.
3
Open the
Operation
menu. Set
Tx Power
to
Off
.
4
Open the
Active
menu. Set
Pulse Type
to
CW Medium
.
5
Open the
Setup
menu.
6
Select
BITE
to open the dialog box.
a
Select
Noise
to open the page.
b
Select
Start Noise Measurements
.
Содержание SX90 - DATASHEET FOR NAVAL AND COAST GUARD REV A
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