Manual Lowrance X-15A (page 4 of 12) (English)

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1. INTRODUCTION

The Lowrance X-15A is a

highly

sophisticated recording depth

sounder. Thanks to a micro-com-

puter,

the X-1 5A can do more than

any

other sonar unit in its

price

range plus many

that cost much

more. Thanks to a

waterproof key-

board,

full control of the

system

your fingertips

to meet the

changing

demands of

varying

bot-

tom

conditions,

water

depth,

and

boat

speed.

You can select the

unit's

sensitivity, suppression

level,

upper

and lower

depth range, pa-

per speed, GRAYLINE,

and

many

more features. The

patented

Lowrance variable

suppression

system

combined with

the new

Discrimination feature not

only

fil-

ters out false

signals

without dis-

torting

the real

ones,

but is

synchronized

with the

GRAYLINE

function to

provide

clear

signals

under all conditions.

2. HOW IT WORKS

When the unit is turned

on,

electronically

regulated

motor

drives a

lightweight

belt located at

the

right edge

of the

recording pa-

per.

The

stylus

is attached to this

belt.

When the

stylus

is at the

top

of the

paper

small mark is

made. This is called

the zero

mark,

and

represents

the surface

of the water. The

stylus

continues

Figure

move down the

edge

of the

paper

while the sound

pulse

traveling through

the

water,

and

when an echo is

detected,

the

sty-

lus makes another mark on the

paper.

The

depth

of the

object

which reflected the echo can be

read in feet

by comparing

its loca-

tion on the

paper

to the

depth

scale

printed

on the

paper.

The

paper speed

is controlled

a variable

speed

motor.

During

one revolution of the

stylus

belt,

very

narrow mark will be made

the flexible

stylus,

but the

paper

will move a small amount before

the next revolution. Each mark will

blend into the one before so that a

composite "picture"

of the

target

will

made,

one

tiny

mark at

a time.

Due to the

many

features that

this unit

has,

this manual has the

operation

section

split

into two

parts.

The first section is

entitled

"Basic

Operation"

and covers

everything

that is

absolutely

necessary

to use

the X-1SA

wide

variety

of situations. It will tell

you

how to use the basic controls

Sensitivity, Suppression, Paper

Speed,

GRAYLINE,

Range, plus

few

special

functions. This section

Will be

adequate

for most situa-

tions.

However,

once

you

have

mastered the basic

operation

the

X-15A,

you may.

wish to

try

some of the features described in

PULLEY

DRIVE

sTYLUs

DRIVE

B ELT

STYLUS

the

Suppressor

control turned

down to minimum when

looking

for fish.

However,

it is

helpful

sometimes

to have

longer pulse

width when

resolution is not a concern. When

using

a sonar in

deeper

water,

it is

easier for the unit to detect a

long-

pulse coming

back from the

bottom or from fish. This is called

"Probability

of Echo Detection".

The

probability

of the unit

being

able to detect an echo

returning

from

deep

water is diminished be-

cause the further the sound

pulse

has to

travel,

the weaker it be-

comes.

By broadening

the

pulse

length,

essence,

larger signal

is transmitted and it is easier for

the receiver to detect it.

For this

reason,

the micro-com-

puter

in the X-15A

automatically

increases the initial

pulse

length

the

unit

deeper

lower limits are

set

the

operator. (Note:

Initial

pulse length

is the

pulse length

the unit when the

Suppressor

con-

trol is turned to

minimum.)

INITIAL

TRANSMIT

PULSE

WIDTH

(micro-seconds)

110

From 210 feet to 600

feet,

the

initial

pulse length

increases at the

same rate as the

depth.

For ex-

ample,

with the LOWER LIMIT set

to 260

feet,

the initial transmit

pulse length

would be 260

the LOWER LIMIT is set

to 390

feet,

the initial transmit

pulse

would be 390 is.

Finally,

from

600 feet and

below,

the initial

pulse length

remains at

600

micro-seconds.

The transmit

pulse

length

can

be increased from

the initial

point

any

time

by rotating

the

Sup-

pressor

control clockwise. The

maximum amount of

pulse

length

added to the initial transmitter

pulse length

approximately

800

micro-seconds. In other

words,

the LOWER LIMIT is

set to 420

feet,

and the

Suppressor

control is

rotated to the maximum

position,

the transmitter

pulse length

would

be 1220 micro-seconds.

(420

initial +

800

1220.)

Earlier,

we talked about the rela-

tionship

between

pulse length

and

target

separation.

pulse length

increases,

target separation

resolution is

degraded. However,

the

pulse

width is

decreased,

res-

olution

becomes much better.

The X-15A allows

you

to take

advantage

this fact

by making

possible

override the initial

transmitter

pulse

length setting

from what the

micro-computer

selects

according

to the Lower

Limit.

The initial

transmitter

pulse

length

can be set

from 30

2000

ps by

entering

it on

the

key-

board.

By setting

the

initial trans-

mitter

pulse

width to

100

three inch

resolution is

obtained,

equivalent

to an

inch and

half,

and 30

initial

transmit

pulse

length

equal

one inch

resolution! No other

graph

re-

corder in

the market

today

can

give you

this feature. After

setting

the

initial transmitter

pulse length,

the

suppressor

control can still be

used to

cancel out noise

in-

creasing

the

pulse length

or the

Discrimination function described

below can be

used to eliminate

noise and

still have

good

LOWER

LIMIT

(feet)

40-200

GRAPH

PAPER

130

160

200

PULLEY

TRAVEL

2 19

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Lowrance X-15A Manual

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