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. TRANSOM MOUNT-A method ofmounting transducers orothersensors 1. [. . . ] 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. The left arrow decreases sensitivity in the same manner. Noticehow the sensitivity bar moves as you change settings. 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. Largefishwill arch, butturnthesensitivity deeperwaterto seethearch. 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. Thesmaller thesegment, thebetterthescreen resolution will be. 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. During thewinter, colder waterslowsdowntheir metabolism. 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. On the right, the graphhasa propersensitivity setting. 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. [. . . ] DISCRIMINATION inwatershallowerthanthealarm setpoint. Thedeep awarningwhenyou're alarm gives a warningin water at ordeeperthanthe alarm set point. The bottom signal is the onlyecho that will trigger either theshallowor deep alarm. NOTE: Inorderto usethedepth alarms, eitherthedigitalorautomaticmust Thedepth alarm is actually twoalarms. [. . . ]