Compact soundome contains a dual-frequency transducer. See fish targets you have never seen before! The world’s first dual-frequency searchlight sonar CH-300 is designed for a wide range of commercial or sport fishing vessels. Its operating frequency can be selected from either 60/153 or 85/215 kHz, and the transducers are incorporated in one soundome. The high frequency of 153 and 215 kHz gives a highly detailed search near and all around the vessel. The lower frequency 60 and 85 kHz enables long-range searches of over 500m. With the advantages of both high and low frequencies, the CH-300 helps to search rough seabeds as well as greatly enhance fish school detection. A variety of presentation modes are available: horizontal and vertical scan, echo sounder and the combination mode displaying horizontal and vertical scan/historical/plotter presentations. The combination of horizontal and vertical scan helps when evaluating
the distribution of fish schools in both the horizontal and vertical planes simultaneously. The CH-300’s unique mix mode uses the frequency characteristic that “high frequency beams receive stronger echoes from tiny fish, compared with low frequency”. By comparing the returned echo intensity of both frequencies, this mode picks out the echoes of tiny fish and displays them in discriminative colors. Other echoes are displayed in the weakest color. This helps to discriminate tiny fish such as small bait fish from other fish.