03-19-2004, 05:37 PM
Here's an excerpt from an article that explains it. I can't verify it's validity, but it's an explanation at any rate.
TRANSDUCER SELECTION
Look at various transducers and their features, they are the key to viewing with accuracy. The frequency determines effectiveness at given depths. Frequencies range from 50kHz to 455kHz. Deepwater models (600 to 1500 feet) operate at the lower frequencies while higher frequencies work better in shallow water (3 to 500 feet). More expensive models offer dual frequencies as features. A dual frequency unit gives the boater the best of both worlds. You get a narrow cone angle and good resolution of high frequencies and the depth penetration of the low frequency when needed. This combined with a split screen capability gives the ability to search out small targets like local structure and suspended fish at various levels.
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TRANSDUCER SELECTION
Look at various transducers and their features, they are the key to viewing with accuracy. The frequency determines effectiveness at given depths. Frequencies range from 50kHz to 455kHz. Deepwater models (600 to 1500 feet) operate at the lower frequencies while higher frequencies work better in shallow water (3 to 500 feet). More expensive models offer dual frequencies as features. A dual frequency unit gives the boater the best of both worlds. You get a narrow cone angle and good resolution of high frequencies and the depth penetration of the low frequency when needed. This combined with a split screen capability gives the ability to search out small targets like local structure and suspended fish at various levels.
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