Manual Lowrance X-15A (page 6 of 12) (English)

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TRANSDUCER SELECTION

Lowrance offers

you

the choice

of transducers With either an 8 de-

gree

or 20

degree

cone

angle

that

will

interchange

with

any

of our

192 kHz sonar units. In

other

words, any

Lowrance sonar instru-

ment can

be used

with

any

Low-

rance transducer of the same

frequency

without

retuning

any

kind,

and no loss of

performance.

However,

the use of

any

other

manufacturer's transducer will re-

sult in a

loss

performance.

Now

you

can select the trans-

ducer

design

and cone

angle

best fit

your specific

needs. Gen-

erally,

wide cone

angle

transduc-

ers

(20 degree)

are

ideally

suited

for

operating

in shallow water or

at medium

depths.

The 20

degree

cone

angle

allows

you

to see

more of the underwater world.

15 feet of

water,

the 20

degree

cone

angle

allows

you

to see an

area of the bottom that's

approxi-

mately

6 feet across. The 8

degree

transducer covers

only

about a 2 foot circle.

Figure

Thus,

you

would use a 20 de-

gree

transducer when

looking

for

fish or

structure,

easily

find

drop-offs,

and to see fish that are

around

you.

. . not

just

below

you.

However,

the 20

degree

trans-

ducer won't

penetrate

greater

depths

as well as the 8

degree

transducer,

nor will it show a

sharp drop-off

as well. In a

deep-

water environment

(100

feet or

deeper)

the narrow cone

angle

more desirable because it can

accurately

detect the loca-

tion of the fish or

drop-off

deeper

water. Since the sound

energy

is concentrated in a

smaller

area,

it can reach to

deeper depths.

Both the 8

degree

and the 20

degree

Lowrance transducers

give

accurate bottom

readings,

even

though

the bottom

signal

much

wider on

the 20

degree

model be-

cause

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

the

bottom,

i.e. whether

you

are over

a soft or hard

bottom,

etc.

III

BASIC OPERATION

On-Off and

Sensitivity

Control

—

Rotate the

Sensitivity

knob

50'

clockwise to turn the unit on.

The

Sensitivity

knob works much like

the volume control on a

radio,

that

100' is,

weaker

signals

will be detected

with

higher settings

of the knob.

When

cruising,

or at other times

when

just simple

bottom contour

information is

desired,

the Sen-

sitivity setting

can be low. In

deep

water or over

soft,

muddy

bot-

zoo'

toms, (which

produce

weak

8°at3db

echos),

the

setting

will have to

higher.

into the unit and the transducer

in contact with the water.

Symptom

The unit is

"ON",

but

paper

does

not move.

What To Do

Tape paper

to cardboard

spool

take-up post.

Symptom

Recorder marks are faint or dim.

What To Do

Clean

viewing

door;

replace

the

stylus;

check

battery

connections.

Symptom

Recorded marks are

very heavy;

paper

is torn

by stylus.

What

To Do

Bend

the

stylus slightly

to reduce

pressure

paper.

ADVANCED OPERATION

Surface

Clarity

Control

(SCC)

The surface

markings

the

top

of the chart

paper

can,

times,

extend

many

feet below the sur-

face. This often interferes with fish

signals

or other

targets.

This

called Surface Clutter and is

caused

by algae

and

plankton,

air

bubbles caused

wave action or

boat

wakes,

bait

fish,

tempera-

ture inversions.

The surface clutter

markings

can be reduced or eliminated

using

the MARKJSCC control

key

on the front

panel keyboard.

To use the

SCC, press

key

thru 4 and

then the MARK/SOC

key.

has a minimum effect on

surface

clutter,

has the max-

imum effect on

reducing

surface

clutter. 2 and

3 have intermediate

effects. The amount of SCC that

used is

printed

at the bottom of

the chart

paper.

If one level of

SOC is

used,

then

S-i is

printed.

Two

levels, S-2,

etc.

The effect on surface clutter

should

immediately

be seen. Use

only

the amount of

SOC

required

to reduce the

clutter,

as fish

sig-

nals can be eliminated

by using

this

method,

also.

you

wish to turn the SOC

function

OFF,

simply press

0-MARK/SOC and

the

SOC

function will be disabled.

Example:

ENTER A SOC

LEVEL OF 2.

Press: 2

SCO

Result:

(See Figure

37.

_17

Depth

C,,,

Angle

Diameter I

L. it g I

0:- gt

1,0,

14 30 I

It" it 53 I

12,0 20 70 I

20'at:

l2-----—-

I—

Figure

37 SCC "2"

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Lowrance X-15A Manual

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