Bedienungsanleitung Lowrance X-15A (Seite 5 von 12) (Englisch)

Feet,

Fathoms,

Meters

The X-1SA will

display

the

depth

in

feet, fathoms,

or meters. Al-

though

the unit will revert back to

the feet mode whenever

power

is

turned

off,

it is

simple

to

change

to

any

mode

you

wish

by pressing

the 2nd

key

and then 1 for

feet,

2nd

-

2 for

fathoms,

and 2nd

-

3 for meters.

When the unit is in the Feet

mode,

only

one U will be dis-

played.

In the Fathom

mode,

two

I.! U's

will be

displayed.

Three

I.!

I.! U

's will be

displayed

in the

meters mode.

Example: Display

Fathoms

Press: 2nd

-

2

Result:

o

-u

H

---—-—--

—-----

H

lb lb

20

I

--

20

Figure

38

By looking

at the number of

U's,

one can determine the

depth

display

mode that the unit is

in,

i.e., Feet-, Fathoms-,

Meters.

Transmit

Pulse

Width

The noise

suppression system

in the X-15A is a

patented pulse

length

discrimination

suppression

circuit,

and is the same as the one

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.

If

the receiver circuit can

be ad-

justed

so

that it will

accept

only

long pulses,

then the short

pulses

will be

canelled

out,

and

only

the

desired information

(fish,

bottom,

structure, etc.)

will be

displayed.

Of

course,

the transmitter's

pulse

length

would have to be increased

at the same time so that the re-

turn echoes would be

accepted

by

the receiver.

This is

exactly

what the Low-

rance

suppression system

does.

The

transmitter's

pulse length

is

increased

by

the front

panel

sup-

pression control,

and

the receiver

"tracks" the amount of increased

pulse

length, 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

by

this

process.)

The

only disadvantage

to this

system

is

resolution,

or the

ability

to

separate targets,

is

diminished

when the

pulse length

is in-

creased.

A

200

s (micro-second)

transmitter

pulse length

used on

the X-15A 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 6 inches

apart

are

displayed

on the

graph

paper, they

will show

up

as two

separate

arches when the trans-

mitter is

operating

with a 200

ps

pulse length.

Now,

if we increase

the transmitter's

pulse length

to

400

jis, (by rotating

the

Suppres-

sor control

clockwise)

those same

two fish arches will blend

together

and show

up

as one fish or

pos-

sibly

even a "blob" on the

paper.

With a 400

ps

transmit

pulse

width,

those same two fish will

have to be at least 12 inches

apart

before

they

will show

up

as

two

separate

arches on the

graph.

This is

why

it is

important

to leave

the section entitled "Advanced

Op-

eration". This

chapter

will describe

several other features that will en-

able the serious

operator

to

get

the maximum benefit from this

equipment.

We

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

to

use,

thanks to

the

power

of the

micro-computer

and the front

panel

controls.

Should

you require

extra

help,

or

just

have a

question, please

call

our Customer Service

Department

toll

free 1-800-331-3889.

(Okla-

homa residents call collect

-

1-918-437-6881.)

Or check the en-

closed list for a service center in

your

area.

A

representative

will be

happy

to

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.

Holes in

the bracket base allow

wood

screw or

bolt

mounting.

A wood

stiffener

may

be

required

on the

back of

thin

fiberglass panels

to

support

the unit.

If the desired

location is closer

than

18" to a

magnetic compass,

a trial run should

be made with

the

unit in

operation

to be sure

that the

compass readings

are

not affected.

Power Connections

—

Twelve volt DC

power

for the

depth

sounder should

be

supplied

by

the boat's 12 volt electrical

sys-

tem. The

power

cable

may

be at-

tached to an

accessory

or

power

buss,

but if

you

have

problems

with electrical

interference,

the

cable should be attached

directly

to the

battery.

If a

longer

cable is

required,

use

ordinary

#18

lamp

cord available

at

any

hardware or electrical

sup-

ply

store.

Splices

should be sol-

dered,

however,

if this isn't

done,

then use

crimp-type splices. Tape

all

splices

with electrical

tape.

An

in-line fuse holder with

fuse

is

supplied

with the X-15A. Be cer-

tain to install this as close to the

power

source

(such

as the boat

battery

or

power buss)

as

pos-

sible. This will

protect

both the

sonar unit and the

power

cable

in

the event a short occurs.

Crimp

connectors are

supplied

to attach

the fuse holder to the

power

cable. The red wire in the

power

cable is the

positive

conductor.

The black wire is the

ground

or

negative

conductor.

The

graph

is

protected

from

ac-

cidental

polarity

reversals and no

damage

will occur if the

wires are

reversed. The unit

will not

operate

until the

proper polarity

is

applied.

9

—-— --——--.--—-—

8

2

-

2

Figure

2

18

3

Ground

(Negative)

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