Installation manual

Simrad SP70

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.