Bedienungsanleitung Lowrance X-20 (Seite 5 von 16) (Englisch)

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The

Discrimination feature on Lowrance sonar units removes

many

false

signals

from other

sonars,

acoustic and electrical

sources,

and

more.

FISH ALARM

An alarm that activates

when a fish or

suspended object

is detected.

FISH ARCH

A sonar with

good

resolution and definition can

display

suspended targets

upside

down "Vees" or arches. These

signals

are

typically

fish,

hence the name "Fish Arch". See

page

for more

information.

FLUSH MOUNT

A transducer that is installed with the bottom of the

transducer

flush with the bottom of the hull.

GIMBAL BRACKET

A bracket

used to install a sonar unit

perma-

nently.

The sonar unit can

rotate in the bracket for the best

viewing

angle.

GRAYLINE Thi feature shows the

relative

strength

signals

dis-

played

on the screen.

Signals

weaker than

the GRAYLINE

setting

are

displayed

black,

stronger targets

are

gray.

It also

gives

clues to the

composftion

of the bottom.

In other

words,

you

can tell if the bottom is

soft or hard. A hard bottom returns

strong signal causing

wide

gray

line.

soft,

muddy

weedy

bottom returns a weaker

signal

which is

emphasized

with

narrow

gray

line.

IN-DASH

A sonar unit

installed

through

a hole in the boat's dash.

Usually,

the face of the sonar is flush

nearly

so with the dash.

kHz

Kilohertz. A measurement of

frequency.

Your Lowrance sonar

operates

at 192 Kilohertz.

(192,000 cycles per

second).

LCD

Liquid crystal display.

The screen or

display

of a

Liquid Crystal

Graph

sonar

instrument.

LCG

Liquid Crystal Graph.

NOISE

Any

undesired

signal.

Electrical noise is caused

engine

ignitions systems, radios,

etc. Acoustic noise is caused

the

vibration

of the

engine

or other mechanical

sources. Noise

appears

on the

display

as random

dots or lines.

NOISE

Minimize electrical noise

routing

the

power

cable

away

from

other

possible

sources of electrical interference.

One of the

largest

noise

generators

is the

engine's

wiring

harness that runs from the

engine

the instrument

panel.

This harness

usually

contains a wire for the

tachometer which radiates RF

(radio

frequency) energy.

For best

results, keep

the

power

and transducer

cables

away

from the

engine

wiring.

Also, bilge pump wiring

can sometimes

radiate noise so

try

keep

the X-20's

cables

away

from those wires.

VHF radio

antenna cables

typically

radiate

energy

higher power

levels than the

engine's wiring

harness. It is

important

keep

the X-

20's

power

and transducer cables as far

away

possible

from VHF

radio cables.

If interference

begins

at slow boat

speeds,

worsening

as the boat

speed

increases,

then a

probable

cause is acoustic

noise,

or cavitation.

This

noise is not

electrical,

but

rather

mechanically

induced

noise from the

transducer.

Stop

the

boat,

put

the

engine

neutral,

and increase

the

Rpm.

If the noise does not

increase on the

display,

then it is cavitation.

Usually,

air bubbles

passing

over the face of the transducer

create

acoustic noise. The faster a boat travels,

the more air bubbles increase

and

generate

noise on the

display.

To eliminate this

problem,

read the

transducer

installation section

for

proper mounting techniques.

TRANSDUCER

Transducer installation

instructions are

packaged separately

with the

transducer. Please read the

instructions

carefully

before

you

install the

transducer.

Periodically

wash the transducer's

face with

soap

and water to remove

any

oil film that

may

collect. Oil and

dirt on the face will reduce the

sensitivity

may

even

prevent operation.

Paint transducers

on salt water boats with a thin

coat of anti-foulant

paint

prevent

organisms

from

growing.

unchecked,

barnacles and

other marine

growth

will cause a decrease

the transducer's

sensitiv-

ity.

Do not use

a metal based anti-foulant

paint

as it

will decrease the

transducer's

sensitivity.

There are

special

anti-foulant

paints specifi-

cally designed

for transducers.

They're readily

available

at most marine

dealers

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