X-20 INSTALLATION AND OPERATION INSTRUCTIONS •LOWRANCE ELECTRONICS, INC. LITHO IN U.S.A. 988-0105-17 12000 E. SKELLY DR.
TABLE OF CONTENTS INTRODUCTION INSTALLATION POWER CONNECTIONS NOISE TRANSDUCER KEYBOARDBASICS OPERATION SENSITIVITY CHARTSPEED RANGE ZOOM DIGITAL FISH I.D. FEATURE AUTO ALARMS CHARTALARM FISH ALARM SPEAKER LIGHT MODE TRANSDUCERS AND CONE ANGLES SIGNAL INTERPRETATION FISH ARCHES WATERTEMPERATURE AND TI-IERMOCLINES SURVEYING A LAKE BAIT FISH HOW TO OBTAIN SERVICE SPECIFICATIONS GLOSSARY — 1 1 1 3 3 4 7 7 9 I A AU 4 I Cr 11 12 I — p.
SENSITIVITY - The ability of a sonar unit's receiverto display targets. Increasing the sensitivity allows weakertargets to be displayed. Also called "gain". SCROLL SPEED - See CHARTSPEED. SHOOT-THROUGH-HULL - A transducer installation which allows the sonar signalsto pass through a fiberglass hull withoutcutting a hole in the hull. SUPPRESSION - A method used in some sonar units to help eliminate interference or noise.
electrical interference, then attach the cable directly to the battery. Electrical interferenceshows as random dots on the display whenever the boat's engine or an accessory is on. The power cable has two wires, red is the positive lead and black is negative or ground. Attach the in-linefuse holderto the red wire on the powercablewith thecrimpconnector. The other end ofthefuse holder attaches to the battery or accessory buss. If the cable is not long enough, spliceordinary#18 gaugewire onto it.
The Discrimination feature on Lowrance sonar units removes many false signals from other sonars, acoustic and electrical sources, and more. FISHALARM - An alarm that activates whena fish or suspendedobject is detected. FISH ARCH - A sonar with good resolution and definition can display suspended targets as upside down "Vees" or arches. These signals are typically fish, hence the name "Fish Arch". See page 20 for more information.
Operating Current 200 ma (lights off) 500 ma (lights on) Operating Voltage 9-15 vdc Number of pixels 50 x 27 Display Scroll Speed .5" per minute (minimum) 32" per minute (maximum) Maximum Chart Range Maximum Digital flange (vertical x horizontal) 1350 Total 180 feet 400 feet GLOSSARY ANCHOR WATCH - A selling of the sonar unit's alarm. The alarm activates when the boat drifts into shalloweror deeper waterthan the alarm set points.
BAIT FISH The importance of bait fish to successful fishing can't be over-emphasized. They are the principalfood of all game fish in mostwaters. Bait fish are the plankton feeding forage fish, such as minnows and shad. Bait fish can also be the young of game fish, such as crappies, bluegill, and bass. Most bait fish concentrate within five feet of the surfacewhere sunlight promotes the growth of the plankton on whichthey feed. One method of fishing is to use the unit to find the bait fish first.
stay. Schooling fish suspended over deep water lie at the level that providesthis temperature. We assumethey are the most comfortable here. The temperature of water in the lake is seldom constant from top to bottom. Layers of different temperatures form, and the junction of a warm and cool layer of water is called a thermocline. The depth and thickness of the thermocline canvary with the seasonor timeof day. In deep lakes there maybe two or more at differentdepths.
WATERTEMPERATURE AND THERMOCLINES Water temperature has an important-if not controlling-influence upon the activities of all fish. Fish are cold blooded and their bodies are always the temperature of the surrounding water. During the winter, colder water slows down their metabolism. At this time, they need about a fourth as muchfood as they consume in the summer. Most fish don't spawn unless the water temperature is within rather narrow limits.
With highsensitivity settings, a second bottomecho (second echo) may appear. This is normal. It's caused by the returning signal reflecting off the surface of thewater. Then it makes a second trip to thebottomand back again. <— . A Remember, when the unit's automatic feature is on, the receiver's sensitivity automatically adjusts to the surroundingconditions. The microcomputerplaces it at a level slightlyabovethe minimum required to pick up the bottom signal.
r ci 3.; 11 i ZOOM flSH D 57L_J CHART SPEED At power on, thechart speed scrolls at a preset speed. To change the speed, pressthe CHARTSPEED key. The word "CHART" will flash on the right side of the display. A vertical bar will also appear on the left side of the screen. This indicates the currentchart speed. Next, press the up arrow key if you wish to increase the chart speed. Press the down arrow key to decrease it. When the chart reachesthe desired speed, release the key.
RANGE The range automatically changes to keep the bottom signal on the display when the unit is in automatic. The range cannot be manually changed when the unit is in the automatic mode. The range can be changedin manual mode. Thereare six ranges available:0-5, 15, 30, 60, 120, and 180 feet. To change the range, first makecertain the word AUTO is off. Then press the RANGEkey. The word RANGE will flash on the right side ofthescreen.
MODE 5-All chart, High Speed Scroll. In this mode the chart scrolls at highspeed. The chart speed can be adjusted with the CHART SPEED key if desired. a) Chart uses full screen. b) No digital depth indicator. _ta sa •a iii •a Cu c) No FASTFRAK. No automatic operation allowed. d) e) No h-in -IL, ZOOM - Manual Mode Zoom operates differently when the unit is in the manual mode. The range doesn't change when the zoom key is pressed.
FISH I.D. The Fish 1.0. featureis automatically on whentheunit is firstturnedon. The computer insidethe unit analyzes all echoes, filtering out unwanted signals. It helps eliminatesurface clutter, thermoclines, and other undesirable signals. The remaining suspended targets are usually fish. Targets that are identified by the unit as fish are displayed as small, medium, or large fish symbols on the display. These symbols are shown according to the relative size ofthe fish as seenby the unit. The Fish l.D.
MODE TheX-20 has five differentscreen modes. To change modes, pressthe MODE key. Keep pressing the MODE key until the desired screen appears. A summary of the differentscreen modes follows. MODE 1 - Thisis the default mode usedwhen the unitis firstturned on. It hasthefollowing features: a) •13I Small digital depth dis- play in lower left corner. It does not show tenths of a foot. Normal chart display. AUTO AUTO When the unit is first turned on, the automatic feature is enabled.
CHARTALARM To setthe ChartAlarm, press theCHARTALARM key on the keyboard. Thewords "Chart Alarm" flashesin the lowerright cornerofthescreen. A verticalbar also displayson the left side ofthe screen. It will stay on thescreen for eightsecondsor foreightsecondsafteryou have finished adjusting it. This is the ChartAlarm's "window" Anyechothat appears between the top and bottom of this bar will sound the alarm. Adjust deep end of this barto make a smalleror larger alarm "window.
