Furuno FCV-582L manual TVG Level, Echo Offset

2.5 TVG Level

TVG (Time Varied Gain) compensates for propagation attenuation of the ultrasonic waves. It does this by equalizing echo pre- sentation so that fish schools of the same size appear in the same density in both shallow and deep waters. In addition, it reduces sur- face noise. Note that if the TVG level is set too high short range echoes may not be dis- played.

1.Turn on the power while pressing any key.

2.Press the ZOOM key three times. The start-up screen appears and shortly there- after the TVG SELECT display appears.

TVG SELECT

50kHz= 5(0 9) 200kHz= 5(0 9)

▲▼ : 50kHz

- + : 200kHz

Figure 2-5 TVG select display

3.Operate appropriate key among [▲], [▼], [+] or [–] to set level.

4.Press the POWER key to escape.

2.6 Echo Offset

The echo offset feature functions to compen- sate for too weak or too strong echo level. If the on-screen echo level appears to be too weak or too strong and the level cannot be adjusted satisfactorily with the GAIN control, do the following to adjust echo level:

1.Turn on the power while pressing any key.

2.Press the SIG LEV key three times. The start-up screen appears and shortly there- after the ECHO OFFSET display appears.

ECHO OFFSET

50kHz= 0(-99+99) 200kHz= 0(-99+99)

▲▼ : 50kHz

- + : 200kHz

Figure 2-6 Echo offset display

3.Operate appropriate key among [▲], [▼], [+] or [–] to set level.

4.Press the POWER key to escape.

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