Handleiding Lowrance X-1550 (pagina 4 van 12) (Engels)

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I INTRODUCTION example,

with the LOWER LIMIT

transmitter

pulse

width is

selected,

The Lowrance X-1550 is a

highly sophisticated recording

depth

sounder. Thanks to a mic-

rocomputer,

the X-1 550 can do

more than

any

other

depth

soun-

der in its

price range.

Full control

of the

system

is at

your finger tips

to meet the

changing

demands of

varying

bottom

conditions,

water

depth

and boat

speed.

You can

select the unit's

sensitivity setting,

suppression

level,

depth range,

paper speed,

and the

degree

"Gray

Line".used

enhance the

recorded information: The

pat-

ented Lowrance variable

suppres-

sion

system

not

only

filters out

false

signals

without

distorting

the

real

ones,

but is

synchronized

with

the

gray

line

function to

pro-

vide clear

signals

under all condi-

tions. The

permanent

record of

what

your

sonar has "seen" is

rolled and stored inside the case.

Small boat sonar

systems

are

routinely

used to measure water

depth,

examine bottom

contours,

and locate fish. The

capability

the X-1 550

goes

far

beyond

the

ordinary.

Clues to the

composition

of the bottom are

given

—

schools

bait fish are

easily distinguished

from

solitary game

fish

—

there is

continuous

display

of information

about bottom contours and sub-

merged shipwrecks

—

fish closer

together

than six inches can be

shown

separately

—

concentra-

tions of

algae,

moss or

plankton

can be identified

—

trolling

speeds

individual fish are com-

monly

recorded with a characteris-

tic "arched"

signature

which dis-

tinguishes

them from their sur-

roundings

—

layers

of water with

different

temperatures

can be de-

tected under

good

conditions,

and

vertical movement of

fish,

(up

down),

can be shown.

HOW

IT WORKS

When the

unit

turned

on,

electronically regulated

motor

drives a

lightweight

belt located at

the

right edge

of the

recording

paper.

The

marking stylus

is at-

tached 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.

set to 260

feet,

the initial

transmit

pulse

width

would be

260

ts.

the LOWER LIMIT is set to

390

feet,

the initial transmit

pulse

would be 390

Its. Finally,

from 600

feet and

below,

the

initial

pulse

width

remains at

600

micro-seconds.

The

transmitter

pulse

width can

be increased from the initial

point

any

time

by rotating

the

Sup-

pressor

control clockwise. The

maximum

amount of

pulse

width

added to the initial transmitter

pulse

width is

approximately

800

microseconds. In other

words,

the LOWER LIMIT is set to 420

feet,

and the

Suppressor

con-

trol is rotated to the maximum

pos-

ition,

the transmitter

pulse

width

would be 1220 micro-seconds.

(420

initial

800

1220.)

Earlier,

we talked about the rela-

tionship

between

pulse

width

and

target separation.

pulse

width

increases,

target separation

resolution is

degraded.

However,

the

pulse

width

decreased,

resolution becomes much

better.

The X-1550 allows

you

to take

advantage

of this fact

by making

possible

to override the initial

transmitter

pulse

width

selling

from what the

micro-computer

selects

according

to the Lower

Limit.

The initial transmitter

pulse

width can be set from 30

2000

jis

by entering

it on the

keyboard

as shown below.

No other

graph

the market

today

can

give

you

this feature.

After

setting

the initial transmitter

pulse

width,

the

suppressor

con-

trol can

still be used to cancel out

noise

by increasing

the

pulse

width.

For

example,

if a 50

initial

and the

Suppressor

control is ro-

tated to

maximum,

the transmitter

pulse

width would be 850

j's.

Re-

turning

the

Suppressor

control to

minimum will restore the unit to a

/.ts

transmitter

pulse

width.

The X-1550 will

display

the initial

transmitter

pulse

width at the bot-

tom of the

paper

when

you

over-

ride the

micro-computer.

To distin-

guish

the initial transmitter

pulse.

width from the

depth

scale

printed

on the

paper,

a zero is

printed

front of the

pulse

width so that the

two will not be confused. For

example,

a 100

j's

transmitter

pulse

width will be

displayed

the

paper

as 0100. A 50

Its

transmitter

pulse

width would be

displayed

0050,

while a

50-foot

depth

will be

displayed

as 50. To

set the initial transmitter

pulse

width,

simply press

the amount of

pulse

width desired on the

keyboard,

and then

press

both the

LINES and SCALES

keys

at the

same time.

(Note:

If the lines

and/or the scales were turned

off,

this will turn them back on. To turn

them back off

again, press

either

the SCALES

key

or the LINES

key

independently.

Do not

press

them

simultaneously.)

This will override the micro-

computer's

selection and set the

initial transmitter

pulse

width to the

desired

setting. (Note:

When an

initial transmit

pulse

width is

set,

this width will be

fixed for all

depth

settings

until

changed

or until con-

trol is returned

to the micro-

computer.)

To return the unit to the control

of the

micro-computer, simply

press

0 and then the LINES and

SCALES

keys

at the same time.

This will

revert the

unit

back to

normal

operation.

Figure

Fish: 17 ft.

Depth:

35 Ft.

TRULINE RECORDER BOTH SEND AND

RECEIVES SIGNALS.

RECEIVED SIGNALS ARE INDICATED ON

GRAPH PAPER.

2 19

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