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

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TRANSDUCER SELECTION

Lbwrance

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 of

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 v4ater or

medium

depths.

The 20

degree

cone

angle

allows

you

to see

of the underwater world. In

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

arouhd

you.

. . not

lust

below

you.

However,

the 20

degree

trans-

ducer wont

penetrate

greater

depths

as well

as-tjie

degree

transducer,

nor

will t show a

sharp drop-off

well. In a

deep-

water

environment

(100

feet or

deeper)

the narrow cone

angle

desirable because it can

accurately

detect the loca-

tion df

the

fish or

drop-off

deeper

water.

Since the sound

energy

is concentrated

in a

smaller

area,

can reach to

deeper depths.

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 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

of the

bottom,

i.e.

whether

you

are over

a soft or

hard.bottom,

etc.

Ill

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 controi on

radio,

that

100'

is,

weaker

signals

will

be detected

with

higher

settings

the knob.

When

cruising,

or at

other times

when

just

simple

bottom

contour

information is

desired,

the Sen-

sitivity

setting

can be low.

deep

water or over

soft,

muddy

bot-

200'

toms,

(which produce

weak

8°at3db

echos),

the

setting

will have to

higher.

into the unit and

the transducer is

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

viewtng

door;

replace

the

stylus;

check

battery

connections.

Symptom

Recorded

marks are

very heavy;

paper

is torn

stylus.

What To Do

Bend the

stylus slightly

to reduce

pressure

paper.

ADVANCED OPERATION

Surface

Clarity

Control

(SCC)

The

surface

markings

at the

top

of the chart

paper

can,

times,

extend

many

feet below the sur-

face. This often

interferes with fish

signals

other

targets.

This

called

Surface Clutter and is

caused

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

MARK/SCC control

key

on the front

panel

keyboard.

To use the

5CC, press

key

thru 4 and then

the MARK/SCC

key.

1 has a

minimum effect on

surface

clutter,

4 has the max-

imum

effect on

reducing

surface

clutter. 2 and

3 have intermediate

effects. The

amount of SCC

that is

used is

printed

at the bottom of

the chart

paper.

one level of

SCC is

used,

then S-i is

printed.

Two

levels,

5-2,

etc.

The effect on

surface clutter

should

immediately

be seen. Use

only

the amount of

SCC

required

to reduce the

clutter,

as fish

sig-

nals can be

eliminated

by using

this

method,

also.

you

wish to

turn the 5CC

function

OFF

simply press

0-MARK/SCC and the 5CC

function will be

disabled.

Example:

ENTER A SCC

LEVEL OF 2.

Press: 2

SCC

Result:

(See Figure 37.)

Depth

23'

'2 Itt. tIn.

520 14

III 21 13

224 20 II

—

12—

———.-- ——-—-—-—--——---

—lie

bO—--S—2 U

——-—----——---bO—--fl----—-

Figure

5CC 11211

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Lowrance X-15B Manual

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