System description
9
850--164186 A
• OFF - filter switched off
• WEAK - compares 2 pings
• MEDIUM - compares 4 pings
• STRONG- compares 8 pings
Note that in rough seas, when the beam easily can miss the target
in several pings, the PP filter should be used with care.
TVG (Time Variable Gain)
The TVG function controls the gain of the receiver so that a school
with a given size and density is presented with approximately the
same strength on the display, inside the regulated TVG range.
This can also be seen as a filter, because it reduces the noise close
to the vessel.
The regulated strength of the TVG can be selected in the menu.
Transmission
The transmitting is controlled by the signal processor in the
Transceiver Unit, with parameters chosen by the operator. There
are 240 separate transmitters in the unit distributed on 8
transceiver circuit boards. Each transmitter is individually
addressed and controlled from the signal processor. The
controlled parameters include power output and beam angles for
each transducer element.
1.5 Auxiliary equipment
The SP70 sonar requires connection to a speed log and a course
gyro. An inaccurate log or gyro input will cause inaccurate
indication of the vessel and target movements.
In addition to log and gyro, the following auxiliary equipment
can be connected to the sonar:
• A (D)GPS may be connected to the SP70 sonar to establish the
vessels position and provide cursor and marker latitude and
longitude.
• Simrad echo sounder (EQ, ES and EK series). Gives depth
readout in the menu and a bottom plot on the catch data page.
• Simrad PI30 Purse Seine System. Gives the net depth in digits
and bars on the vertical views.
• Simrad Trawl Instrumentation: FS 900, FS 3300 or ITI.
- FS 900 and FS 3300: The trawl will be displayed in correct
depth.
- ITI: The trawl will be displayed in correct depth, distance
and bearing.
For connection of any of this auxiliary equipment, contact your
local dealer.
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