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Simrad SN90 Operator Manual
•
Ping-Ping Filter
The
Ping-Ping Filter
pings in order to remove unwanted noise and false echoes from the SN90 presentation.
•
Pulse Type
The
function allows you to select the "shape" of the transmitted pulses
Pulse Type
("pings"). Different shapes have different qualities. Which pulse type to use depends
on the current environmental conditions, your range to the target(s) and the type and
speed of the target(s) you are observing.
•
Bandwidth
The
function allows you to select the frequency range in the Hyperbolic
Bandwidth
Frequency Modulated (HFM) transmissions.
•
Frequency
The
function allows you set the centre frequency for the Hyperbolic
Frequency
Frequency Modulated (HFM) and Linear Frequency Modulated (LFM) transmissions
(pings), and the operating frequency for the Continuous Wave (CW) pings.
•
Horizontal TX Sector
The SN90 transmits in a swath with maximum horizontal opening angle 160°. By
means of the
Horizontal Tx Sector
120 or 160°.
•
Vertical TX Sector
The SN90 transmits in a swath with maximum vertical opening angle 160°. By means
of the
Vertical Tx Sector
•
Range Projection
The distance to a target located anywhere in the water column can be measured in two
ways. This can either be the horizontal distance to the target (True), or along the tilt
angle (Slant). The
•
AGC (Automatic Gain Control)
The
(Automatic Gain Control) function runs an automatic analysis of the echo
AGC
strength.
•
RCG (Reverberation Controlled Gain)
The
(Reverberation Controlled Gain) function removes unwanted reverberation
RCG
from the bottom and or from the sea surface. This enhances the visibility of schools.
It may however also remove scattered fish from the presentation.
•
Noise Filter
The
removes unwanted acoustic noise from the SN90 presentation. It
Noise Filter
reduces the interference from other acoustic systems (sonars and echo sounders),
as well as the noise from the propellers.
170
analyses the historical information from previous consecutive
function, you can change this opening angle to 90,
function, you can change this opening angle to 80 or 120°.
function defines how this distance is measured.
Range Projection
381295/B
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