User manual LOWRANCE X-40

[. . . ] ( X-40 LIQUID CRYSTALGRAPH INSTALLATION AND OPERATION MANUAL ·eLOWRANCE ELECTRONICS, INC. UTHO IN U. S. A. SKELLY DR. , TULSA, OK 74128 PDF compression, OCR, web-optimization with CVISION's PdfCompressor TABLE OF CONTENTS TRANSDUCER -Theelement ofasonar system that convertsthe electrical energyfrom thetransmitter Into ultrasonic sound waves. When a return echo strikes thetransducer, it converts the sound waves into electrical energywhich is received anddisplayed by the sonar unit. oat. POWER CONNECTIONS NOISE TRANSDUCER KEYBOARD BASICS DISPLAYINTERPRETATION OPERATION ON 2 3 3 4 6 7 7 7 I CLEAR AUTO SENSITMTY CHART SPEED SCALE RANGE LOWER LIMIT UPPER UM1T AUTO BOTTOM TRACKING GRAYLINE DIGITAL TENTHS ALARMS NOTE KEY ZONEALARM DEPTH ALARM LIGHT DiSCRIMINATION s 8 9 11 11 UPPER/LOWER UMIT-Thesearetherangelimitsdisplayed onthe sonar screenor paper. [. . . ] Increasing the sensitivity causes thebar totravel tothe right, increasing in length correspondingly. Sellingthe sensitivity to maximum will cause the bartoextend acrossthetopofthedisplay. (There are 32stepsofsensitivity available. ) To placetheX-40 in manual mode, presstheAUTO keyonce. Theword AUTO at the top of the display will disappear, signifying thattheX-40 is inthe manual mode. To Increasethe sensitivity, press and holdthe right arrowkey until the sensitivity is at the desired level. When you presstherightarrowkey, the bar moves totheright, indicating increase an insensitivity. Pressingthe leftarrowkeymovesthebar totheleft, showing thesensitivity hasdecreased accordingly. You'll also seethe change on Very small fish probablywill notarch at all. Medium sized fishwill showa partial arch, or a shape similar toan arch if they're in deep water. upin Because ofwaterconditions, suchas heavy surface clutter, thermoclines, etc. , the sensitivity sometimes cannot be increased enough to get fish arches. Oneof the bestwaysto getfish arches is to expand or "zoom" a segmentofthewater. Forexample, 40to60feet. Then, turnupthesensitivity as high as possible withoutgettingtoo much noise on thescreen. In medium to deepwater, this method should work to displayfish arches. WATERTEMPERATURE AND THERMOCLINES aiwaysthe temperature ofthesurroundingwater. Atthistime, they need aboutafourth as muchfood as they consume in the summer. Fish are cold blooded and their bodiesare Watertemperature has an important-If not controlling-influence thedisplay. Thephotoonthenext page showsa graph withtoolittlesensitivity. Afish alongwith highersurface clutterare nowvisible, and the bottom signal haswidened. 8 29 PDF compression, OCR, web-optimization with CVISION's PdfCompressor Brush usually lies on the bottom and shows up as clumpsrising abovethebottomsignal. Brushsignals looksimilartolargerocks, however their signal is notas strongas rock. 11/Vs AUTO FISH SIGNALS Thesignals displayed onthe X-40 by fish are identified by various shaped markings in certain patterns, as opposed torandom marks created by noise. Or thesolid, continuous markings made bythebottom. Typically, fishare identifiedby acharacteristic archthat separates them from their stationary surroundings. Thedistanceto afishwhenitmoves intothesonar'sconeofsound isshownas"A" below. Whenthefishhas moved intothecenterofthecone, the distanceto it will be shorter, "B". As it moves out of the cone, the distancewill Increase again as shown In "C". 8C SENSITIVITY: TOOLOW SENSITIVITY: PROPER a second bottom echo (second echo) mayappear. It's caused by the returning signal reflecting offthesurface ofthewater. [. . . ] Just press theDEEP SET keyfirst, then thearrow keys tosetthe bottomof the bar to the desired depth. If you wish to viewthe zonealarm bar continuously, press 2nd, DISPLAY. It doesn't turn the alarm off, just the alarm bar. When thezonealarm istriggered by an echo, thealarmwill sound the words ZONEALM will appear on thedisplay. To change to a different ievel, simplyentera numberfrom to 10, then press 2nd, SOC or simplypress2nd, SCC. Use the arrow keys inthe keyboard's zone alarm section toincrease ordecrease theSOC levei. [. . . ]