APPENDIX A — Technical specifications
Table 8: 491 technical specifications (Continued)
Manual controls
Gain | 0 to 75 dB |
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Clutter | 0 to 9 |
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Signal level | 0 to 5 |
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Noise limiter | ON/OFF |
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White level | Background color |
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Range | up to 3500 feet (1000 meters) |
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Advance speed | 1/8 to 2/1 |
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Depth units | Feet, meters, fathoms |
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Installation calibrations | Speed, temperature, gain, transducer depth/ |
| offset |
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PAGE 28 | 491 INSTALLATION MANUAL Revision A |
