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Simrad SP70
12
850-164186 / Rev.D
Note that in rough seas, when the beam easily can miss the
target in several pings, the PP filter must 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. The parameters you have chosen are used.
There are 241 separate transmitters in the unit distributed on
eight transceiver circuit boards. Each transmitter is individually
addressed and controlled from the signal processor. The
controlled parameters include power output and time delay for
each transducer element in order to form a beam with the
selected tilt angle.
When the stabilisation system is active, the tilt angle for each
beam will automatically be corrected relative to the vessel’s
pitch and roll movements.
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