Handleiding Lowrance X-15B (pagina 4 van 12) (Engels)

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INTRODUCTION

The

Lowrance X-1SB is a

highly

sophisticated

recording depth

sounder. Thanks to a

micro-com-

puter,

the

X-l5Bcan

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.

HOW IT

WORKS

When the

Unit is turned

on,

electronically regulated

motor

drives

lightweight

belt

located at

the

right

edge

of the

recording pa-

per.

The

stylus

éttached to

this

belt:

When

the

stylus

at the

top

of the

paper

a small

mark is

made.

This is called

the zero

mark,

and

represents

the surface

of the

water. The

stylus

continues

to move

down the

edge

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

comparing

its loca-

tion on the

paper

to the

depth

scale

printed

on the

paper.

The

paper speed

is controlled

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

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-15B in a

wide

variety

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-15B,

you may

wish to

try

some of

the

features

described in

the

Suppressor

control turned

down to minimum

when

looking

for fish.

However,

it is

helpful sometimes

have

longer pulse

width when

resolution is not a

concern. When

using

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.

broadening

the

pulse

length,

essence,

larger signal

tranmitted and

it is easier for

the

repeiver to detect

it.

For this

reason,

the

micro-com-

puter

in the X-15B

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

•130

160.

40-200

200

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

260

feet,

the initial

transmit

pulse

length

ouId be

26Oxs.

the

LQWER LIMIT is

set to 390

feet,

the initial

transmit

pulse

would

be 390

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

rotating

the

Sup-

pressor control

clockwise. The

maximum

amount of

pulse

length

added

to the

initial

transmitter

pulse

length

approximately

aoo

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

1220

micro-seconds.

(420

initial +

800

1220.)

Earlier,

we talked

about the rela-

tionship

between

pulse length

and

target separation.

pulse

length

increases,

target

separaflon

resolution is

degraded.

However,

the

pulse

width is

decreased,

res-

olution

becomes much

better.

The

X-159

allows

you

take

advantage

of this

fact

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

2000

p.s by

entering

it on

the

key-

board.

setting

the

initial trans-

mitter

pulse

width to

100

p.5,

three inch

resolution is

obtained,

p.s

equivalent

to an inch

and

half,

and 30

p.s

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

initia( transmitter

pulse

length,

the

suppressor

control can

still be

used

to cancel

out noise

in-

creasing

the

pulse length

the

Discrimination

function

described

below can be

used to

eliminate

noise

and still have

good

Figure

LOWER

LIMIT

(feet)

r—

.--•

_—

PULLEY

TI]

1 DRIVE

+-1STYLUS

• i

DRIVE

BELT

STYLUS

GRAPH

PAPER

TRAVEL

-4-—PuLLEV

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