X-20A INSTALLATION AND OPERATION INSTRUCTIONS •LOWRANCE ELECTRONICS, INC. LITHO IN U.S.A. 988-0105-36 12000 E. SKELLY DR.
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TABLE OF CONTENTS INTRODUCTION INSTALLATION POWER CONNECTIONS KEYBOARD BASICS OPERATION SENSITIVITY CHARTSPEED RANGE ZOOM DIGITAL FISH I.D. FEATURE 1 1 2 3 5 5 7 8 8 9 10 11 11 AUTO ALARMS CHARTALARM 12 FISH ALARM SPEAKER LIGHT MODE SIMULATOR TRANSDUCERS AND CONE ANGLES SIGNAL INTERPRETATION FISH ARCHES WATER TEMPERATURE AND THERMOCLINES SURVEYING A LAKE BAIT FISH SPECIFICATION SERVICEINFORMATION TROUBLESHOOTING 13 13 13 14 16 17 18 18 20 21 22 22 23 23 Copyright © 1991, Lowrance Electronics, Inc.
. Theboat mustbemovingat aslowtrollingspeedtoseefish arches. Iftheboat is motionless, fish stay inthe cone,showing on thedisplayas straighthorizontal lines. ELECTRICALNOISE Amajorcause ofsonar problems is electrical noise. Thisusuallyappearson the sonar's display as randompatternsof dots or lines. In severe cases, it can completelycover the screen withblackdots, orcause the unitoperateerraticly, or not at all.
Weak bottom echo, digital readings erratic, or no fish signals(cont4: INTRODUCTION 2. Electrical noisefromtheboat'smotorcaninterferewlththesonar. Thiscauses the sonarto automatically increase its Discrimination or noiserejection feature. Thiscan cause theunittoeliminateweakersignalssuchas fish oreven structure Welcome from the display. depth, fish, and structure. As you becomefamiliarwith your X-20A,you can "fine tune" the unit to the surroundingconditionsto get the most from your sonar. 3.
Power Connections The X-20A operatesfrom a 12 volt battery system. Attach the power cable to an accessory or power buss. If you have problems with electrical interference, then attach the cable directly to the battery. Electrical interference shows 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. Attachthe in-linefuse holderto the red wire on the powercablewith thecrimp connector.
thus marked, you can make your turn and come backto fish in exactly the right spot. This is essential when you're far from shore on a big lake. Unless you mark the school of fish when you're over it, you may not be ableto find it again. _.a1.J BAIT FISH The importance of bait fish to successful fishing can't be over-emphasized. They are the principal food of all game fish in most waters. Bait fish are the plankton feeding forage fish, such as minnows and shad.
SENS. -1 This key and the arrow keys adjustthe graph's sensitivity. (The digital's sensitivity is adjusted by the unit automatically.) The receiverhas 32 steps of adjustment. ______ CHARTSPEED IUIi'I Vary the speed of the chart with this key and the arrow keys. There are 5 stepsof chart speed adjustment, •;hUtIa RANGE The depth range is changed with this key and the arrow keys. The ranges varyfrom 0-5 feet to 0-180feet.
WATERTEMPERATURE AND THERMOCLINES OPERATION Waler temperature has an important-if not controlling-influence upon the activities of all fish. Fish are cold blooded and their bodies are SENSITIVITY always the temperature of the surrounding waler. During lhe winter, colder water slows down their metabolisrri. At this time, they need about a fourth as much food as they consume in the summer. Most fish don't spawn unless the water temperalure is within rather narrow limits.
.— With highsensitivity settings,a secondbottomecho (second echo) may appear. This is normal. It's causedby the returning signal reflecting off the surface of thewater. Then it makes a second tripto thebottom and back again. BOAT'S DIRECTION OF TRAVEL U SENSrnVITY BAR N I- 14.: AUTO SENS RANGE 20 4L FISH ID .. EU A Remember, when the unit's automatic feature is on, the receiver's sensitivity automatically adjuststo the surrounding conditions.
Both 8 degree and 20 degree transducers give accuratebottom readings, even though the bottom signal is much wider on the 20 degree model. This is because you are seeing more of the bottom. Remember,the shallow edge of the signal showsyou the true depth. Therest of the signal tells you whetheryou are over rocks, mud, etc. SIGNAL INTERPRETATION Your unitgivesan accuratepicture of thebottomthat your boat is passing. A bottom of firm sand, gravel, shell, or hard clay returns a wide bottom signal.
RANGE The range automatically changes to keep the bottom signal on the display when the unit is in automatic. The range cannot be changed when the unit is in the automatic mode. The range can be changed in manual mode. There are six rangesavailable: 0-5, 15, 30, 60, 120, and 180 feet. (Metric units: 0-3, 6, 15, 30, and 45 meters.) To change the range, first make certainthe wordAUTO is off. Then pressthe RANGE key. The word RANGEwill flash on the right side of the screen.
MODE 5 - All chart, High Speed Scroll. •10 In this mode the chart scrolls at high speed. The chart speed can be adjusted with the CHART SPEED key if desired. a) Chart usesfull screen. AUTO -. RANGE 20 b) No digital depth indicator. c) No FASTRAK. d) No automatic operational- ZOOM ___LID lowed. e) No Fish l.D. feature or Fish Alarm f) Chart alarm is allowed. SIMULATOR Your unit has a built-in simulator. All that is required for thesimulator to operate is a 12 volt D.C. source.
FISH I.D. The Fish 1.0.feature is automatically on whentheunit is first turned on. The computerinside theunit analyzes all echoes, filtering out unwanted signals. It helps eliminatesurface clutter, thermoclines, and other undesirable signals. The remaining suspendedtargets 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 tothe relative sizeofthe fish as seen by the unit. The Fish l.D.
MODE AUTO The X-20A has five differentscreen modes. To change modes, press the MODE key. Keep pressing the MODE key until thedesired screen appears. A summary 01 the differentscreen modes follows. MODE 1 - This is the default mode used when the unit is first turned on. It has the following features: a AUTO RANGE - 2f1 a) Small digital depth display in lower left corner. It does not show tenths of a foot. Normal chart display. When the unit is first turned on, the automatic feature is enabled.
CHARTALARM To settheChartAlarm, pressthe CHARTALARM key on thekeyboard. The words " ChartAlarm" flashesin the lowerright cornerofthescreen. A verticalbar also displayson the leftside ofthe screen. It will stay on thescreen foreight seconds or for eightsecondsafteryouhavefinished adjustingit. This is theChartAlarm's"window." Any echo that appears between thetop and bottom of this bar will sound the alarm. Adjust deep end ofthisbar to make a smalleror larger alarm "window.
