User manual LOWRANCE X-30

[. . . ] X-30 LIQUID CRYSTALGRAPH INSTALLATION AND OPERATION MANUAL ·0LOWRANCE ELECTRONICS, INC. 12000 E. SKELLY DR. , TULSA, OK 74128 PDF compression, OCR, web-optimization with CVISION's PdfCompressor LITHO IN U. S. A. 988-0105-22 TABLE OF CONTENTS TRANSDUCER -Theelement asonar system thatconvertsthe electrical of energyfrom the transmitter into ultrasonic sound waves. When a return echo strikes the transducer, it converts the sound waves into electrical energy whichis received and displayed by the sonar unit. 2 3 3 4 6 7 7 7 8 8 9 12 12 POWER CONNECTIONS TRANSDUCER NOISE KEYBOARD BASICS DISPLAYINTERPRETATION OPERATION ON OFF TRANSOM MOUNT-Amethodofmounting transducers orothersensors on the transom ofthe boat. UPPER/LOWER UMIT-ThesearetherangeilmutsdIsplayedonthesonar screen or paper. [. . . ] Forexample, iftheconepasses overafish inshallowwater, the signal displayedontheX-30 maynotarch at all. This is due to the narrowcone diameter and the resolution limitations of the display. Thereason forthisisthepixels (dotsonthescreen) are muchlargerthan a paper graph'smarkings. Therefore, theX-30 cannotshowfisharchesas ToturnAuto Sensitivity backon, press theAUTO key. Remember, pressing the AUTO key turns both automatic sensitivity and auto ranging functionson and off atthesametime. AUTO SENSITIVITY ADVANCED OPERATION When the X-30 is in theautomaticmode, the receiver's sensitivity conditions. Themicro-computer automatically adjuststothe surrounding mlnimumrequired topickupthebottom places itatalevelslightlyabovethe signal. 9 PDF compression, 28 OCR, web-optimization with CVISION's PdfCompressor Changing the sensitivity level while the X-30 is in the automatic mode ispossible. (But only if"FISHALERT" Isoff. ) Thismaybedesirable ifthe sensitivity level is notenough toshowfish orother small detail. The X-30 will increase the sensitivity to pick upthe bottom signal, then add in the level you programmed. If desired, you canadd sensitivity up to the maximum. Do not use a metal based anti-foulant paint as it will decrease the transducer's sensitivity. There are special anti-foulant paints specifically designed fortransducers. They're readily available atmost marine dealers. SIGNALINTERPRETATION Since your X-30 is both extremely sensitive and powerful, it gives an accuratepictureofthe bottomthat your boat Is passing. A bottom of firm sand, gravel, shell, or hard clay returns a fairly wide signal. If the automatic sensitivity isoffand thesignal narrows down, then itmeansthat you have moved over a mud bottom. Astheboatpasses overthe mudbottom, theX-30will automatically increasethe sensitivityto maintain agood bottomsignal. Thesensitivity barwill helpyou indetermining ifthe bottom Issoftor hard. If it increaseswhileinthesame depth ofwater, then the boat hasmoved overa softbottom. lfitdecreases, thenitisovera hard bottom. Of course, as the water depth increases or decreases, the sensitivity will also change. To adjustthesensitivity whilethe X-30 is in theautomatic mode, simplypress the right arrowkeyto Increase it. Ifthevaluegoesbelow theminimum required to the the bottom signal, the X-30's audible tone will sound an alert. As you press the £LNSJ V (VIT -- Simulated Pictures Bigrocksor stumpsonasmooth bottomsend backsignalsabove the bottom level signal. As you passover a post, it will be clearly visible as a short line extending above the bottom signal. Asteep slopereturns awidesignal, the steeperthe wider. Signals returned from a high underwater cliff are usually the widest of all. Brush usually lies on the bottom and shows up as dumps rising abovethe bottomsignal. [. . . ] For example, with maximum 5CC, on a 0 to 60 foot range, 5CC would have an effect from the surface to 30 feet. To adjusttheshallow(top) alarm, press theSHALLOW SET key. Thealarm bardisplays with a small arrow pointingtothetopofthe bar. This signifies thatthetop or shallow portionofthe bar is ready for adjustment. Six secondsafter the adjustments are made, the alarm bar disappears. DEEPSET Setthe bottomofthezoneinthesamemannerusingthe with thesmall arrow key. Thenpress the uparrowkeytomake the bottom part of the window move shallower. [. . . ]