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> Model 244 Multi-Frequency Echo Sounder |
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The Model 244 Multi-Frequency System is a dynamic, digital split-beam/single-beam hydroacoustic system. Combining powerful digital signal processing hardware with a Microsoft Windows XP™-based user interface, the Model 244 System produces results in real-time, with multiple data display and storage options. |
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| > Multi-Frequency Echo Sounder Spec Sheet |
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> Model 244 Deep Tow Multi-Frequency System |
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The Model 244 Deep Tow Multi-Frequency System is a robust, digital split-beam/single-beam hydroacoustic system designed to be towed up to 1000 m (3280 ft) deep. Combining powerful digital processing hardware with a Microsoft Windows XP™
user interface, it is ideal for deep ocean fisheries and plankton research [originally developed for Woods Hole Oceanographic Institute (WHOI) plankton studies].
Learn more about WHOI plankton studies, at "Biomaper-II: An integrated instrument platform for coupled biological and physical measurements in coastal and oceanic regimes", 2002 Wiebe, P.H., T.K. Stanton, C.H. Greene, M.C. Benfield, H.M. Sosik, T. Austin, J.D. Warren, and T. Hammar, “ ,” IEEE J. Ocean. Eng. 27, 700-716.
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Rated to 1000 m (3280 ft) deep. |
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Samples up to 16 split-beam or single-beam
transducers operating at up to 5 different frequencies between 38 kHz and 1 Mhz. |
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Either slow (timed) or fast multiplex (alternating pings) sampling among transducers. |
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High resolution: up to 1400 range strata as small as 10 cm, summary data available as frequently as every 6 sec, and ping rate up to 50 pings/sec. |
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FM slide/chirp signals provide up to a 15 dB gain in signal-to-noise ratio, reducing bias and variability in resulting fish target strength and biomass estimates. |
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| > Deep Tow Echo Sounder Spec Sheet |
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