Manual Lowrance X-15 (page 7 of 14) (English)

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example,

with the LOWER LIMIT

set to 260

feet,

the initial

transmit

pulse

width would be 260

is.

If the LOWER LIMIT is set to

390

feet,

the initial transmit

pulse

would be 390

jts. 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

rotating

the

Sup-

pressor

control clockwise. The

maximum amount of

pulse

width

added to the initial transmitter

pulse

width

approximately

800

microseconds.

In other

words,

the LOWER

LIMIT

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 is

decreased,

resolution becomes much better.

The X-15 allows

you

take

advantage

of this fact

making

possible

to override the

initial

transmitter

pulse

width

setting

from what the

micro-computer

selects

according

to the Lower

Limit.

The

initi?l

transmitter

pulse

width can beset from

2000

ps by entering

it on the

keyboard

as shown below.

set-

ting

the initial

transmitter

pulse

width to 100

Its,

a three-inch

reso-

lution can be

obtained,

1as

equivalent

to an inch and

half,

and 30

j.ts

initial transmitter

pulse

width is

equal

to one

inch resolu-

tion! No other

graph

in the market

today

can

give you

this

feature.

20:

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

SOjLs

initial

transmitter

pulse

width is

selected,

and the

Suppressor

control is

ro-

tated to

maximum,

the transmitter

pulse

width would be 850

Re-

turning

the

Suppressor

control

minimum will restore the unit to a

jis

transmitter

pulse

width.

The X-15 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

Its

transmitter

pulse

width will be

displayed

the

paper

as 0100. A 50

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

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.)

ducer

design

and cone

angle

best fit

your specific

needs.

Gen-

erally,

wide cone

angle

transduc-

ers

(20 degrees)

are

ideally

suited

for

operating

in shallow

water or at

medium

depths.

The

degree

cone

angle

allows

you

to see

more of the underwater

world. In

15 feet of water the 20

degree

transducer covers an

area of the

bottom that's about 6 feet across.

The 8

degree

transducer covers

only

about a 2 foot circle.

Thus,

you

would use a

20 de-

gree

transducer when

looking

for

fish or

structure,

easily

find

drop-offs

reefs,

and to see

fish

that are around

you

. . . not

just

below

you.

However,

the

de-

gree

transducer won't

penetrate

greater depths

as well as the 8

degree

transducer,

nor will

show

sharp drop-off

as well. In a

deep-water

environment

(100

ft. or

deeper)

or where

you're looking

sharp drop-offs,

the narrow cone

angle

can sometimes be

more de-

sirable because it can more accu-

rately

detect the location of

the

drop-off

without

displaying

the fish.

deep

water,

with the sound

energy being

concentrated in a

•

smaller

area,

the 8

degree

trans-

ducer can reach

greater

depths.

Both the 8

degree

and the

degree

Lowrance transducers

give

accurate bottom

readings,

even

though

the bottom

signal

much

wider on the

degree

model be-

cause

you

are

seeing

of the

bottom.

Remember,

the shallow

•

edge

the

signal

shows

you

the true

depth.

The rest of

the

signal

tells

you

whether

you

are over

rocks, mud,

drop-offs.

The narrow bottom

sig-

nal

of the 8

degree

transducer

merely

reveals

less information

about the bottom's contours. This

feature

particularly

useful when

using

the X-15

offshore.

1. TPD-1 192-20

Wide cone

angle

(20 degree)

for shoot-thru-hull

trolling

motor mount.

2. TPD-1192-8

Narrow cone

angle (8

degree)

for shoot-

thru-hull.

3. TI-lS-1192-20

Wide cone

angle

(20

degree)

for

high speed

transom

mount or shoot-thru-

hull.

4. TTH-21 92-20 Wide cone

angle

(20

degree)

for thru hull mount

or transom mount.

TTH-2192-8 Narrow cone

angle

(8 degree)

for thru hull mount

or transom mount.

Ill BASIC OPERATION

On-off

and

Sensitivity

Control

—

Rotate

the

On/Off

knob clockwise

to turn

the unit on. The

Sensitivity

knob

works much like the volume

control on

radio,

that

is,

weaker

signals

will be detected with

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Lowrance X-15 Manual

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