Vexilar FL-8 - Manual (Page 19)

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shop service.
Another kind of interference comes from another depth finder
operating on the same frequency nearby. The two factors that deter-
mine if this happens are: a) the depth of the water and, b) how far
apart the two sounders are placed. If this interference is happening,
each of the sounders will have a non stop rotating light moving
around the dial. One moving light rotates around the dial clockwise
and on the other sounder the light will rotate in the counter clockwise
direction. To eliminate this problem you can either move the
sounders farther apart or shut one off.
Which Side of the Transducer Should Be Aimed
Toward The Lake Bottom?
Most of today's transducers have two sides to them. Side A is the
side that the cable enters the transducer and usually has holes, slots,
or some method to attach a bracket to. Side B is usually flat but may
have different shapes, such as round, square, or arrow shaped. The
Side B or the Flat side should be aimed toward the lake bottom.
What Does the Zero Light Mean?
The zero light is actually the start point of the unit's transmission
of sound waves. On the display it indicates the zero foot point. This
signal has very little use. Sometimes a portable transducer arm can
cause "ringing" which will display as a very wide zero. The width of
the zero indication. The width of the zero indication should never be
more than 5 feet wide. Most problems occur when the arm, that the
transducer is attached to is metal. Plastic or wood transducer arms
cause little problems. To test your portable box system, in air, turn the
FL-8 on, range 1, and with the gain control turned to maximum posi-
tion, note the width of the zero indication. If the zero indication is
wider than 5 feet, squeeze the transducer and metal arm together with