4. VIDEO SOUNDER OPERATION

Dual-frequency display

The dual-frequency display provides both 50 kHz and 200 kHz pictures. This display is useful for comparing the same picture with two different sounding frequencies.

 

0.0

LF

HF

Dual-frequency display

LF picture

The sounder uses ultrasonic pulses to detect bottom conditions. The lower the frequency of the pulse, the wider the detection area. Therefore, the low frequency is useful for general detection and judging bottom condition.

HF picture

The higher the frequency of the ultrasonic pulse the better the resolution. Therefore, the high frequency is ideal for detailed observation of fish school.

low frequency

high frequency

Sounding area and transmission frequency

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Furuno 1722, 1753C, 1742, 1733C Dual-frequency display LF picture, HF picture, Sounding area and transmission frequency