Manual Lowrance X-15 (page 9 of 14) (English)

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1/14

mediately

be seen. Use

only

the

amount of SCC

required

to reduce

the

clutter,

as fish

signals

can be

eliminated also.

To turn the 5CC function

OFF,

press

0, MARK/SCC.

The 5CC

value

(1,

can be

changed

or turned OFF at

any

time.

Feet, Fathoms,

Meters

The

X-15 will

display

the

depth

feet,

fathoms,

or meters. Al-

though

the unit will revert back to

the feet mode whenever

power

is turned

off,

it is

simple

change

any

mode

you

wish

by pressing

1 and

3 for feet

—

4 and 6 for

fathoms,

and 7 and 9 for meters.

These

keys

must be

pressed

simultaneously

for this feature to

work.

When the unit is in the Feet

mode,

only

one

will

be dis-

played

at the bottom of the chart

paper every

few inches. In the

Fathom

mode two

L's

will be dis-

played.

Three

L's

will be

printed

on the Meter mode.

Example: Display

Meters

Press: 7 and 9

simultaneously

Result:

Figure

lb Ib—

20—

By looking

at the

number of

's,

one can determine the

depth display

mode that

the unit is

in, i.e.,

Feet

U Fathoms

or Meters

I.! U U.

Transmit and Print Alternate

When

using

the X-15 in

deep

water,

may

be desirable to slow

the

paper speed

down considera-

bly.

However,

when

doing

so,

you

may get

"over

print"

very

dark,

heavy printing

over an area

that is

difficult to read. Much detail can

be lost due to this.

A feature that the X-15 makes

available is the Transmit and Print

Alternate

which,

when

activated,

causes the

stylus

print every

other revolution instead of

every

revolution. This

accomplishes

three

things:

1. Since the

stylus only prints

every

other

revolution,

the re-

corded

information is not

squeezed together

into a

very

small area. This allows better

records at slower

paper

speeds.

Also,

the scale num-

bers are

spread

out

more,

they

are more

legible.

2. Prevents the

possibility

"wrap

around". This is the

undesirable

occurrence of the

second

or third bottom echo

printed

on the

paper

at the

top

or middle of the

page.

Many

times this can interfere

with fish or other

targets

that

you

wish to see.

—

3. Reduces the reverberation ef-

fect. This

happens mainly

—

lower

frequency

units,

al-

though

it does sometimes

show

high frequency

—

graphs.

To use the Transmit

and

Print Alternate

function,

press

the UPPER and

LOWER

keys simultaneously.

you

wish to turn the function

off,

simply press

the UPPER

and LOWER

keys again.

Transmit Pulse Width

The noise

suppression system

in the X-15 is a

patented pulse

width discrimination

suppression

circuit,

and is the same as the one

pared

to real

sonar

signals.

Ad-

vancing

the

Suppression

knob will

cause the

system

reject

these

unwanted,

short

pulses

without

reducing

the

sensitivity

any way.

This

patented design

is exclu-

sive with Lowrance.

However,

with

high suppression settings,

the

graph

record becomes coarse and

the

ability

separate

fish from the

bottom

or from other fish will be

decreased.

(See Figure 10.)

Therefore,

the lower the

suppres-

sion

setting,

the better. Advance

the knob

setting only

as far as

necessary

to remove the

erratic,

unwanted noise marks. Most of

the time at low or

trolling speeds,

suppression

will be needed.

Paper Speed

Control

This knob

adjusts

the

speed

the chart

paper.

For

good

detailed

graphs,

in shallow to medium

depths,

turn the

paper speed

con-

trol

to at least ¾ when

trolling.

For best

details,

turn it

maximum. This will show

proper

fish arches at low

speeds

and

keeps high speed

information

from

being compressed.

The

paper

speed

should be turned down

when

using

the unit in

deep

water

This will

prevent gap

from

ap-

pearing

in the record.

fact,

the

microcomputer

will

automatically

slow the maximum

speed

the

chart

paper

when

operating

deep

water

The chart below

gives

the

points

where the maximum

speed

of the

paper

is slowed.

RANGE

PAPER SPEED

10'-120'

1 Fastest

paper

speed

130'-510'

2 Medium fast

paper speed

52O83O 3

Medium slow

paper speed

Below 840'

4 Slowest

paper

speed

The chart

paper may

be slowed

even

further

by adjusting

the

paper speed

control.

Remember,

gaps

appear

in the

record,

turn

the

paper speed

down until a solid

record is achieved. The

paper

speed

may

also be

slowed when

not

looking

for fish or to

simply

conserve

paper.

GRAYLINE® On/Off

Knob

The GRAYLINE®

function can be

used to outline the bottom contour

which

might

otherwise

be hidden

beneath trees and

brush;

it can

also

give

clues-to the

composition

the bottom. A hard bottom re-

turns a

very strong signal causing

a wide

gray

line. A

soft, muddy

weedy

bottom

returns a weaker

signal

which is

emphasized

with a

narrow

gray

line. Do not advance

the control too far or it will

gray

RD I

lirf

P,," I® .

Figure

9 PROPER

SETrING

Figure

10 SUPPRESSION: TOO HIGH

C—

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Lowrance X-15 Manual

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