NorthStar Navigation 491 installation manual On/Off

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APPENDIX A — Technical speciﬁcations

Table 8: 491 technical speciﬁcations (Continued)

Manual controls

Gain	0 to 75 dB

Clutter	0 to 9

Signal level	0 to 5

Noise limiter	ON/OFF

White level	Background color

Range	up to 3500 feet (1000 meters)

Advance speed	1/8 to 2/1

Depth units	Feet, meters, fathoms

Installation calibrations	Speed, temperature, gain, transducer depth/
	offset

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491 INSTALLATION MANUAL Revision A

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Contents Echo Sounder Installation Manual Page Table of Contents Page Who should read this manual Scope of this manual Section ONE IntroductionWelcome to the Northstar Installation considerations Section TWO Installing the transducer Safety considerationsNorthstar-recommended transducers Airmar transducer elementsChoosing a mounting location Do not mount the transducerHull thickness limits Installing the transducer LWLUsing anti-fouling paint LWLCleaning a transducer DetailPage Section Three Installing Section Three Installing Installation Manual Revision a System components Echo sounder system components with the Northstar 961/962Mounting 190 dia 360 diaWiring Connecting the 491 to the 961/962Cable connection between the 961/962 Interface cable connection from 961/962 toConnecting the 491 to the 957/958 Connecting the 491 to a transducer 491-to-transducer connector pin wiringFor the 961/962 Initial checkoutTurning the 491 on Installation test checklist Setting up the echo sounderTurning the 491 off For the 957/958/6000iSection Four Troubleshooting and servicing Status LED961/962 echo sounder system troubleshooting 957/958/6000i echo sounder system troubleshooting Getting technical support Contacting NorthstarOrdering replacement parts Servicing Hearing from youReturning a 491 for service Appendix a Technical speciﬁcations 491 technical speciﬁcationsON/OFF Glossary Cavitation Deadrise Echo sounder Fairing block TransducerGlossary Installation Manual Revision a Index 491 Index Index Installation Manual Revision a