Manual Lowrance X-1550 (page 5 of 12) (English)

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used on all the Lowrance's vari-

able

suppression

flashers and

graphs. Basically,

it works on the

principle

that most noise

pulses

are of

relatively

short duration. It

the receiver circuit can be ad-

justed

so that it will

accept only

long pulses,

then the short

pulses

will be cancelled

out,

and

only

the

desired information

(fish, bottom,

structure, etc.)

will be

displayed.

course,

the transmitter's

pulse

width would have to be increased

at the same time so that the return

echoes would be

accepted by

the

receiver.

This is

exactly

what the Low-

rance

suppression system

does.

The transmitter's

pulse

width is in-

creased

the front

panel sup-

pression

control,

and the receiver

'tracks" the amount of increased

pulse

width,

cancelling

out

any

narrow noise

pulses,

and

display-

ing only

the return echoes from

fish or the

bottom,

etc.

(Note:

Re-

ceiver

sensitivity

is not diminished

at all

this

process.)

The

only disadvantage

to this

system

resolution,

or the

ability

separate targets,

is diminished

when the

pulse

width is in-

creased. A 200

ps (micro-sec-

ond)

transmitter

pulse

width used

on the X-1550 when

power

is first

turned

on,

will allow the unit to

display

two fish or

targets

that are

only

6 inches

apart.

In other

words,

if two fish that are six

inches

apart

are

displayed

on the

graph paper, they

will show

two

separate

arches when the

transmitter is

operating

with a 200

ps pulse

width.

Now,

if we in-

crease the transmitter

pulse

width

to 400

Ps, (by rotating

the

Sup-

pressor

control

clockwise)

those

same two fish arches will blend

together

and show

as one

fish

possibly

even a "blob" on the

paper.

With a 400

tts

transmit

pulse

width,

those same two fish will

have to be at least 12 inches

apart

before

they

will show

as two

separate

arches on the

graph.

This is

why

it is

important

to leave

the

Suppressor

control turned

down to minimum when

looking

for fish.

However,

it is

helpful

sometimes

to have

longer pulse

widths when

noise is not a concern. When

using

a sonar in

deeper water,

it is

easier for the unit to

detect a

longer pulse

coming

back from the

bottom or from

the fish. This is

called

"Probability

of Echo

Detec-

tion." The

probability

of the unit

being

able to detect

an echo re-

turning

from

deep

water is di-

minished because the

further the

sound

pulse

has to

travel,

the

weaker it becomes.

By broadening

the

pulse

width,

essence,

larger signal

transmitted and it

is easier

for the receiver to detect it.

For this

reason,

the microcom-

puter

in the X-1550

automatically

increases the initial

pulse

width of

the unit as

deeper

lower limIts are

set

the

operator. (Note:

Initial

pulse

width is the

pulse

width of

the unit when the

Suppressor

control is turned to

minimum.)

INITIAL

TRANSMIT

LOWER PULSE

LIMIT

WIDTH

(Feet) (Micro-seconds)

10 110

20 130

160

40-200 200

From

210 feet to 600

feet,

the initial

pulse

width increases at

the

same rate as the

depth.

For

Figure

The

stylus

continues to move

down

the

edge

of the

paper

while

the sound

pulse

traveling

through

the

water,

and when an

echo is

detected,

the

stylus

makes

another mark on the

paper.

The

depth

the

object

which reflected

the echo can be read in feet

comparing

its location on the

paper

to the

depth

scale

printed

on the

paper.

A variable

speed

motor drives

the

paper

graph. (The paper

treated so that the

stylus

will burn

to leave a

permanent

black

mark.) 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 "pic-

ture" of

the

target

will be

made,

one

tiny

mark at

a time.

Due to the

many

features that

this unit

has,

we have

split

the

operation

section of this manual

into two sections. The first sec-

tion,

Section

III,

is entitled "Basic

Operation"

and covers

everything

that is

absolutely necessary

use the X-1 550 is a wide

variety

of situations. It will tell

you

how to

use the basic controls

—

Sen-

sitivity, Suppressor, Paper Speed,

Grayline, Range, plus

a few

spe-

cial functions.

This section will be

adequate

for most situations.

However,

once

you

have mastered the ba-

sic

operation

of the X-1 550 as de-

scribed in Section

III,

you may

wish to

try

some of the features

described in Section VI

—

Ad-

vanced

Operation.

This

chapter

will

explain

four other features

that will enable the serious

operator

get

the maximum use

out of this

equipment.

urge you

to read this man-

ual

thoroughly

and familiarize

yourself

with the controls. Al-

though

this is a

very

advanced

unit,

it is

easy

use,

thanks to

the

power

of the

microcomputer

and the front

panel

controls.

Should

you require

extra

help,

please phone

our Customer Ser-

vice

Department

toll free at

1-800-331-3889.

(Oklahoma

resi-

dents call collect

1-918-437-

6881).

A service

representative

will

happy

help you.

II INSTALLATION

Mounting

—

The

depth

sounder

may

be in-

stalled in

any

convenient

area,

provided

the unit can be tilted for

the best

viewing angle.

Four holes

in the bracket base allow wood

screw or bolt

mounting.

A wood

stiffener

may

required

on the

GRAPH

PAPER

-—----

PAPER

QJ—PULLEV

TRAVEL

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Lowrance X-1550 Manual

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