Page 1: Table Of Contents
CRT and straight line paper graphs, for the sport fisherman. Now, with the FL-8SLT, we bring you the first true interference Rejection unit. Again, Vexilar leads, while the others follow.
Page 2: General Description
8SLT also has patented Interference Rejection (IR) Technology. This lets the user "filter out" unwanted interference from another nearby depth sounder. With two models available, deep and shallow, and a wide vari- ety of accessories to choose from, the Vexilar FL-8SLT is second to none.
Page 3: Specifications
SPECIFICATIONS Operating Voltage: 10.5 - 15 Volts (12 Volts Nominal) Current Draw: 200mA Power Output: 400 Watts (Peak to Peak) Frequency: 200 kHz Resolution: 525 Segments Target Separation: 2.65" Min. Display Colors: 3 - Red, Orange, and Green Dimensions: 4.4"H x 6"W x 2.5"D Weight: 1.1 Lbs.
Page 4: Unit Installation
INSTALLATION To make the FL-8SLT work, you must provide the unit with power and mount the transducer in an appropriate location. UNIT INSTALLATION Find a convenient place to mount the unit. This may include a boat seat, deck, dash, or a portable case.
Page 5: Transducer Installation
TRANSDUCER INSTALLATION There are three basic types of transducers to consider: High Speed, Puck Style, and the Ice-Ducer System. HIGH SPEED TRANSDUCERS High Speed transducers are designed to be mounted on the transom of a boat. The wedged shape will cut the water and give a clear depth read- ing at any boat speed.
Page 6 PUCK STYLE TRANSDUCERS There are three ways in which a Puck Style trans- ducer can be mounted. It can be mounted In-Hull, on an electric trolling motor, or portable (with a suction cup or on an arm of some type). IN-HULL MOUNTING This method, gluing the transducer to the hull, gets the same results as if you were using the High Speed transducer only there are no holes...
Page 7 It is a good idea to tie on a safety rope in case the cup does let go. There are three suction cup brackets available for the FL-8SLT. The BK0023 and BK0027 are made to attach the Puck style transducers to a boat for use at slow speeds.
Page 8 THE ICE-DUCER™ SYSTEM* The Ice-Ducer system provides a quick and easy way to set up the transducer for ice fishing. All of the adjustments needed to find the true perpendicular point are done automatically. To use the Ice-Ducer, sim- ply adjust the transducer to the desired depth and drop the assembly in the ice hole.
Page 9: Operation
OPERATION Figure I shows the three main controls of the FL-8SLT. They include Power and Range control, Gain, and Interference Rejection. POWER AND RANGE CONTROL The knob located at the bottom of the control panel turns the unit on and selects which range is to be used.
Page 10 The I.R. feature has eight steps of rejec- tion to let you eliminate unwanted interference from another nearby depth finder. When you turn on the FL-8SLT on, the I.R. automatically comes on to the first step. If necessary, press the I.R. button repeatedly until the interference is eliminated.
Page 11: Typical Indications
TYPICAL INDICATIONS The three-color display on the FL-8SLT can give you a lot of infor- mation if you know how to read it. A color represents the strength of a signal. A red color indicates a strong signal, an orange color indicated a medium strength signal, and green represents a weak signal.
Page 12 ZERO MARK Fig. J ECHO SURFACE CLUTTER BAIT FISH PLANKTON TRAILING FISH EDGE BOTTOM LEADING EDGE Fig. K ZERO MARK SURFACE CLUTTER TRAILING EDGE WEEDS LEADING EDGE BOTTOM POSSIBLE FISH...
Page 13 SEEING FISH The FL-8SLT sees a fish as a target, much like the bottom. It has a leading edge, a width, and color content. Refer, again, to figure J. If the range setting is S x2 then the fish is just over two feet above the bottom.
Page 14 This is due to all of the air bubbles in the turbulent water. ICE FISHING Ice fishing brings out the best in the FL-8SLT. The stable platform of ice lets you concentrate on your bait and the fish around it. The bottom becomes less important because it never changes.
Page 15: Maintenance
MAINTENANCE PERMANENT MOUNT With permanent mount applications, the power cord is left connect- ed to the source, the transducer is not easily removed, and the gimbal bracket is screwed to the seat, deck, or dash. Under these conditions maintenance is very simple because nothing changes once the unit is installed.
Page 16: Operational Questions & Answers
OPERATIONAL QUESTIONS & ANSWERS Where Should The Gain Control Be Set? For ice fishing - the gain control should be set so the bait you are fishing with is shown in green color on the dial. This color should be set while the lure or bait is at the normal fishing depth.
Page 17 How Long Will My Battery Last On The FL-8SLT? Run Time - The FL-8SLT draws about 200 mA, less than a quarter of an amp of current The unit will run good until the battery voltage drops to about 10 volts.
Page 18 Now the lake depth must be mentally corrected for the new position of the transducer. Will The FL-8SLT Read Through The Ice? YES! It will easily read through ice, provided the ice is CLEAR ICE and not MILKY ICE. Remember, the transducer must have GOOD CON- TACT with the surface of the clear ice.
Page 19 Plastic or wood transducer arms cause little problems. To test your portable box system, in air, turn the FL-8SLT on, range 1, and with the gain control turned to maximum position, note the width of the zero indication.
Page 20 the metal arm and the plastic housing of the transducer. This insula- tion layer eliminates any transmission vibrations caused when the unit transmits the signal to the water. What Does the Bottom Light Mean? Besides depth the bottom light can give you a lot of information. The width and color content of the bottom signal can tell you what type of bottom it is.
Page 21: Transducer Beam Angle Chart
TRANSDUCER BEAM ANGLES VERSES DIAMETER OF COVERAGE AND PERFORMANCE Beam angle has a large effect on the perfor- Depth 9º 19º mance of your depth finder. There is more to it than simply area of coverage. The correct beam 10’ 1.6’...
Page 22: Trouble Shooting Chart
TROUBLE SHOOTING CHART Symptom Possible Cause Unit is turned on, but no Check for bad connections, proper hook display and motor is not up polarity, and make sure you have a running. good, fully charged, battery. Unit is turned on and Battery voltage too low.
Page 23: Accessories And Other Products
8SLT or other manufacturer's sonar or GPS. It has space for your transducer, a rechargeable battery, and the Vexilar Battery Status Indicator. Just set it down on the ice or boat seat, position the transducer and turn on your flasher. The round base is just the right size to fit down inside a standard 5 gallon bucket.
Page 24 The Sun Hood gives you full screen visibility in even the most extreme sunlight. Inexpensive and easy to take on and off. More Depth Sounders From Vexilar For a free color brochure please ask your dealer or contact Vexilar. The EDGE...
Page 25 The FL-18 The FL-18 is the first ever flasher to incorpo- rate a split-screen zoom. and with two modes of zoom, a low power mode for shallow water, and a super bright display, this unit is the ultimate three-color flasher. The Boundary Waters Model LC-10 The LPS-1 is a simple to use handheld dig- ital depth finder.
Page 26: Transducers
Transducers and Accessories TB0044 - 19° Transom Mount High Speed Transducer. Comes with the Mounting Bracket and 25 Feet of Cable. TK144 - Complete Mounting Kit. Comes with TB0044 Transducer, FL-8 Power Cord, Unit Mounting Bracket, and all the Hardware You Need to do the Job Right. TB0030 - 9°...
Page 27 Depth Finder. "S" CABLE - The S-Cable (short for Suppression Cable) is used to reduce the output power of the FL-8 or FL-8SLT. This can often help clear up readings in shallow or cluttered waters. Simple installation between the unit and transducer.
Page 28: Service And Support
If you find that you need help please contact us. Have ready the model number and, if possible, the serial number of your product. Be sure to read the Question and Answer and Trouble Shooting sections first. Address Vexilar, Inc. 200 W. 88th St. Minneapolis, MN, 55420-2752 Telephone...

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