•
AGC
: Automatic Gain Control. This function will
automatically reduce the gain if you experience reverberation
and noise, or increase it if the conditions permit it. Using the
AGC will ensure best possible signal processing.
•
RCG
: Reverberation Controlled Gain. This function will
automatically remove unwanted reverberation from the
bottom or from the sea surface. It may however also remove
scattered fish.
•
PP Filter
: The Ping-to-Ping filter will only show you the
echoes if they are still present after several consecutive pings
(2, 4 or 8). This function will provide you with a more stable
echo presentation, as spurious echoes will disappear.
•
Audio Volume
: This button allows you to control the audio
level in the loudspeaker.
Vertical menu
The
Vertical
menu is only shown in modes with a vertical slice
function. All relevant settings, except the
TX Power
, can be
selected separately for the vertical modes independent of the
horizontal settings. When any vertical setting is selected and
defined in one mode, the setting will be applied to all vertical
modes.
•
Range
: Select the current range.
•
Bearing
: Use this function to adjust the bearing of the white
audio channel line.
•
Gain
: This is the analogue gain. If you activate the
AGC
function, this gain setting is ignored.
•
Pulse form
: The standard pulse form is
FM Auto
. If you
experience a lot of reverberation from the bottom, decrease
the pulse length. In good water conditions while searching for
scattered fish, you may well use setting
CW Long
.
•
TX Power
: This button controls the transmission power.
•
Frequency
: On the SP90 you can alter the sonar’s transmission
frequency. This is very useful if you have other vessels in the
vicinity. Remember that lower frequencies will increase the
range of your sonar, but also give you a wider beam.
•
TVG
: Time Varied Gain. This function will automatically
adjust the gain in the sonar to compensate for geometric
spread and absorption. Note that the TVG will only work on
ranges below 1500 meters.
•
AGC
: Automatic Gain Control. This function will
automatically reduce the gain if you experience reverberation
and noise, or increase it if the conditions permit it. Using the
AGC will ensure best possible signal processing.
850-165261/A
17
Summary of Contents for Simrad SP90 Series
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