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Measuring point: TP5 (VG)
Sounding rate: High
The STC (Sensitivity Time Control) curve is also generated in the TVG circuit. It suppresses
the echoes just below the oscillation line, making the oscillation line thin so as not to cover
the fish echoes close to the head rope.
CH1
2V/DIV
100ms/DIV
(A)
Fig. 2.6 waveforms of TVG voltage
Fig. 2.7 TVG curve
CH1
CH2
0 V
Measuring point
CH1: TP5 (VG)
CH2: TP6
2-4
CH1
500mV/DIV
2ms/DIV
CH2
2V/DIV
2ms/DIV
(B)
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