Installation manual

Simrad SP60

850-164575 / Rev.D

However, the sound absorption in salt water increases with the

frequency, thus giving the lower frequencies a longer detection

range.

Related topics

 Frequency options, page 6

AGC (Automatic Gain Control)

This control will automatically adjust the gain in the

preamplifiers depending on the strength of the incoming echo

signals. The strength of the filter can be selected in the menu.

Note that the AGC senses the echo strength in five fixed

directions, and use this as a basis for adjusting all the receiver

beams.

RCG (Reverberation Controlled Gain)

The RCG filter senses the noise level (reverberation, propeller

noise, etc.), and adjusts the gain individually for each of the 64

receiver beams in order to eliminate noise on the display. The

strength of the filter can be selected in the menu. With

maximum strenght is selected, the RCG will effectively reduce

the bottom in shallow water, while variations on the bottom will

be displayed.

Note that scattered fish can be perceived as reverberation. The

RCG filter must therefore be used with care if scattered schools

are to be detected.

PP Filter

The SP60 sonar is equipped with a ping-to-ping filter to give a

clean and steady presentation by reducing the interference and

noise. This filter compares the echoes from a selected amount of

transmissions (pings), and an echo has to be present in the

selected amount of pings in order to be presented on the display.

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.