User manual LOWRANCE X-15B OPERATION MANUAL

[. . . ] To turn this feature on, simply press the 2nd key, then press the "4" key. The paper speed will immediately slow down, signifying that the function is enabled. To turn the Alternate Transmit and Print feature off, simply press the 2nd key and then pressthe "7" key. The paper speed will immediately speed up, signifying that the function has been turned off. [. . . ] Both the 8 degree and the 20 degree Lowrance transducers give accurate bottom readings, even though the bottom signal is much wider on the 20 degree model because you are seeing more of the bottOm. Remember, the shallow edge of the signal shows you the true depth. The rest of the signal tells you the composition of the bottom, i. e. whetheryou are over a soft or hard. bottom, etc. it can Symptom Recorded marks are very heavy; paper is torn by stylus. What To Do Bend the stylus slightlyto reduce pressure on paper. VI ADVANCEDOPERATION Surface Clarity Control (SCC) The surface markings at the top Depth '2 520 III 224 14 21 20 S Itt. 23' 31 13 50' tIn. II 100' 200' 8°at3db Ill BASIC OPERATION On-Off and SensitivityControl -- Rotate the Sensitivityknob clockwiseto turn the unit on. The Sensitivityknob works much like the volume controi on a radio, that is, weaker signals will be detected with higher settingsof the knob. When cruising, or at other times when justsimple bottom contour information is desired, the Sensitivity setting can be low. In deep water or over soft, muddy bottoms, (which produceweak echos), the setting will have to be higher. 4 of the chart paper can, at times, extend many feet below the surface. This often interferes with fish signals or other targets. This is called Surface Clutter and is caused by algae and plankton, air bubbles caused by wave action or boat wakes, bait fish, or tempera- ture inversions. The surface clutter markings can be reduced or eliminated by using the MARK/SCC control key on the front panel keyboard. To use the 5CC, press key 1 thru 4 and then the MARK/SCC key. 1 has a minimum effect on surface clutter, 4 has the maximum effect on reducing surface clutter. The amount of SCC that is used is printed at the bottom of the chart paper. If one level of SCC is used, then S-i is printed. The effect on surface clutter should immediately be seen. Use only the amount of SCC required to reduce the clutter, as fish signals can be eliminated by using this method, also. If you wish to turn the 5CC function OFF simply press 0-MARK/SCC and the 5CC function will be disabled. Example: ENTER Press: 2 - SCC Result: A SCC LEVEL OF 2. (See Figure 37. ) -- 12-- ------. -- ---------------------- --lie bO----S--2 U ------------------bO----fl------- Figure 37 5CC 11211 17 PDF compression, OCR, web-optimization with CVISION's PdfCompressor dure used to removethe old one. BE SURE the fingers of the new stylus are pointed UP. Latch both catchesat the top wheels by reversing the proce- and the water. DO SECTION Do carry a spare fuse, stylus belt, and roll of paper. Do use the empty cardboard core from the last roll of paper on the take-uppost. Do keep the recorded graphs for future reference. [. . . ] (Caution -- Keep hands away from the stylus belt and stylus. High voltage is 0-- 10 -- 20 -- SO -- L'U -. - Figure 20 END-OF-PAPER MARKER The graph paper in the X-15B has a red line printed at the bottom of the paper to signify when there is only 2 to 3 feet before the end of the paper. present. ) Insert a 6"-8" long screwdriver with a blade into the zero adjust hole and rotate the control on the circuit board until the zero line is at the desired position. (Note: This may also be adjusted with the unit turned OFF Adjust the control, then remove the screwdriver and turn power back ON. Repeat until the zero line is in the desired position. ) /" 4° -- 50-- 60 -- IV HOW TO READ GRAPHS "Arched Signatures" A remarkable advantage of the X-15B is that it. [. . . ]