User manual LOWRANCE X-4

[. . . ] INSTALLATION AND OPERATION MANUAL X-4 LCG RECORDER N · LOWRANCE ELECTRONICS, INC. SKELLY TULSA, OKLA. 12OOO E. DR. , 74128 PDF compression, OCR, web-optimization with CVISION's PdfCompressor Litho in U. S. A. 988-0105-21 TABLE OF CONTENTS Introduction Installation Power Connections Noise Keyboard Basics Operation On Off 2nd Clear Auto Sensitivity Automatic SensitivityAdvanced Chart Speed Lower Limit Upper Limit Scale Auto Rangewith Zoom Bottom Track Digital 10th Range 2 2 3 4 5 7 7 7 7 a 8 8 10 io ii i Alarms Zone Alarm Note Key Clearing Zone Alarm Depth Alarm Discrimination Light Surface Clarity Control (SCC) Feet-Fathoms-Meters Transducersand Cone Angles Signal Interpretation Fish Signals Water Temperature and Thermoclines Bait Fish Surveyinga Lake How to Obtain Service How to Obtain aSchematic Specifications 2 13 14 15 15 17 17 18 20 20 20 22 23 23 24 25 26 27 29 30 30 31 31 32 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 1 COMMAND SUMMARY 1. VIEW SCC WITHOUT CHANGING DIGITAL INTRODUCTION Welcome to the world of sportfishingsonar. YourLowrance X-4 is a high quality sonar designed for both professional and novice users. The X-4 automaticallyfinds and displays the bottom depth, fish, and structure by just turning it on. As you grow familiar with your X-4, you can try some of its remarkable features and 'fine tune" the unitto the surrounding conditions. [. . . ] If unchecked, barnacles and other marine growth will cause a decrease in the transducer's sensitivity. Do not usea metal based anti-foulant paint as it will decrease thetransducer's senstivity. There are special anti-foulant paints specifically designed for transducers. They're readily available at most marine dealers. Figure 3 -- SENSITIVITY Figure 4 SEtIS, Ti:TY AUTO. 0------ -- - SIGNAL INTERPRETATION Becauseyour X-4 is both extremelysensitiveand powerful, it can give you an accurate picture ofthe kind of bottom over which your boat is passing. A bottom of firm sand, gravel, shell, or hard clay returnsa fairly wide signal. Ifthe automaticsensitivityis tumed off, and the signal narrows down, then it meansthatyou have moved over a mud bottom because mud absorbs the sound wave and retums a weak signal. Ifyou havethe automatic senstivityturned on, watch the sensitivitybar. As the boat passes over the mud bottom, the X-4 will automaticallyincreasethe sensitivity to maintaina good bottom signal. Thesensitivitybar will help you in determiningifthe bottom is softor hard. If it increaseswhile in the same depth of water, then the boat has moved over a softbottom. Of course, as the water depth increasesor decreases, the sensitivity will also change. Big rocks or stumpson a smooth bottom send back signalsabove the bottom level signal. If youwatch as youapproach a postor a tree stump, it will be clearly visible as a short line extending above the bottom signal. TOO LITrLE SENSITIVITY SENSITIVITY AWUSTED PROPERLY Simulated Picture Simulated Picture 26 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 9 TRANSDUCERS AND CONE ANGLES The sound waves from the transducerspread out intothe water in a cone shaped beam, much like the beam from a flashlight The angle betweenthe outside edges ofthe cone is called the cone angle. Lowrance offers a choice of transducerswith either an 8 or 20 degree cone angle that will interchangewith any of the 192 kHz sonar products. In other words, any Lowrance sonar instrumentcan be used with any Lowrance transducer of the same frequencywith no loss of performance. transducer will result in a However, the use of any other manufacturers' loss of performance. Generally, wide cone angle transducers(20 degrees) are ideally suited for operating in shallow to mediumwater depths. In 15 feet of water the 20 degree cone covers an area about six feet across. The 8 degree transducer covers only about a two foot circle. When the horizontal bar reaches the far right hand side of the screen, the sensitivity level is at maximum. If high sensitivitysettings are used, a second bottom echomay appear. Thisis normal and is caused by the returningsignal reflecting off the surface of the water, making a second trip to the bottom and backagain. This is called "second echo". Remember, both automatic sensitivitycontrol and auto ranging functions are turned off and on at any time by pressingthe AUTOkey. The two controls cannot be turned off or on separatelyby pressing the AUTO key. AUTO SENSITIVITYADVANCEDOPERATION When the X-4 is in the automatic mode, the sensitivity of the receiver will be adjustedto ten steps above the minimum required to pick up the bottom signal. (There are 32 steps of sensitivityavailable. ) Thesensitivitylevel can be changed whilethe X-4 is in the automatic mode. Thismay be desirable if the level of sensitivitychosen by the X-4 is not enough to show fish or other small detail. Oncethe sensitivityhas been changed, the X-4 will increasethe sensitivity enough to pick up the bottom signal, then add in the level you programmed. If desired, any amount of sensitivityup to the maximummay be added. To adjust the sensitivitywhile the X-4 is in the automatic mode, simply press either the right arrow key> to increase the sensitivityor the left arrow key <to decrease it If the sensitivityis decreased to minimum, the X-4'saudible tone will "flutter". The same is true ifyou try to go above the maximumlevel. As you press the arrow key, the sensitivitybar will move right or left, according to the amount of sensitivitychosen. pth 50 1100 1150 Diameter 8' 20' 7ff. [. . . ] Pressingeither shallow or deep set keys will turn theZone Alarm backon with the previoussettings. The upper and lowerlimits can be changed whilethe Auto Rangewith Zoom Bottom Track mode is coupled; however the segmentsize will stay the same internally. When it auto ranges the next time, it will revert back to the original segmentsize. For example, if a window of 30 feet was chosen and the upper limit picked by the X-4 was 20 feet with a lower limit of fifty feet, and then you changed the upper limitto 30 feet when the bottom moves out of the window, the windowupper and lowerlimits will be changed back to a thirty foot window. Use caution when changing the upper and lower limitswhilethe X-4 is in the automatic mode. You can cause it to autorangethe bottom signal off the screen. DEPTH ALARM AL DIGITAL_SONAR DEEP SHALLOW 10TH ALARM ALARM J offthe automatic mode. To exit fromthis function, press 2nd, 8 or press the AUTO key to turn TheDepthAlarm is actuallytwo alarms. Theshallow alarmgives a warning when you're in water shallower than the alarm set point The deep alarm gives awarning in water deeper than the alarm set point. The bottom signal is the only echo that will trigger either the shallow alarm or the deep alarm. Note:The X-4 must be in either the automatic mode or the digital must be on in orderforthe Depth Alarm to function. [. . . ]