Adjusting Gain; Rejecting Sonar Interference And Noise - Furuno CH-37 Operator's Manual

Furuno color sector scanning sonar operator's manual model ch-37

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2.5 Adjusting Gain

Few fish found

or difficult to

find fish

habitat.

Most equipment malfunctioning claims result from improper

setting of switches and controls. For example, fish, fish habitat

or outcrop can not be readily detected by merely increasing

the gain. Initially set the gain between 3 and 5 with the GAIN

control. Then, fine tune depending on the fishing ground, fre-

quency used, etc.

Figure 2-7 How to set the gain

While observing the sonar picture, you may encounter occa-

sional or intermittent noise and interference as shown below.

These are mostly caused by onboard electronic equipment,

engine, propeller noise, or electrical noise from other sonars

being operated nearby.

(A) Inteference from

other sonars

Figure 2-8 Noise and interference

Turn GAIN control clockwise.

4 6

Adjust NL control.

4 6

Adjust TVG controls.

4 6

Turn on "IR" in SONAR menu.

(B) Interference from

marine life

CLEAR

PICTURE!

2-7

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