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Simrad SX90
184
When you choose the TVG setting you can either switch it off, or
choose a
value. The different settings determine how
"X log R"
much gain the sonar will use as time elapses along the X-axis. A
higher value for "X" will make the angle (C) steeper.
Default setting on the SX90 sonar is
What is AGC?
AGC means "Automatic Gain Control". If you wish the SX90
sonar to control its own gain automatically, you must enable this
function. You can choose from three different levels. When
the AGC has been switched on, the manual
have chosen will only work on shorter ranges. Once the range
is increased, the computer will gradually take control over the
sonar gain.
Default setting on the SX90 sonar is
What is the PP Filter?
PP Filter means "Ping-to-Ping Filter". When this function is
activated, the sonar will compare the echoes from one ping with
the echoes from the next pings. If an echo is present at the first
ping, but then disappears at the next, the sonar will interpret this
as noise and reverberation, and remove it.
If you choose setting
consecutive pings. If you choose settings
sonar will compare four and eight pings respectively.
Default setting on the SX90 sonar is
About pulse form and length
On the SX90 sonar, you can transmit sound modulated as FM
or CW.
FM means "frequency modulated", which means that the
frequency of the transmitted pulse is changed during the
transmission. In most cases this method will provide better echo
presentation and stability, and you will avoid excessive noise
and reverberation.
Default setting on the SX90 sonar is
transmission mode, the sonar will automatically choose from a
set of different frequencies depending on the current range.
CW means "continuous wave", which means that the
transmission frequency is fixed during the entire pulse. When
you use CW transmission you can choose the length of the
pulses. In a search phase under good conditions, you should try
setting
. If the conditions worsen, try to shorten the pulse
Long
length. This will make it easier to distinguish the various echoes,
and the reverberation will be reduced.
20 log R
Medium
, the sonar will only compare two
Weak
Medium
Medium
FM Auto
.
setting you
Gain
.
or
the
Strong
.
. In this
307670/D
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