Manual Lowrance X-16 (page 8 of 16) (English)

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Recording

individual

fish with an

"arched"

signature

can

usually

accomplished

trolling speed

with the

Sensitivity

knob at the ¾

point,

higher.

Refer to

the

section 'Arched

Signatures"

for

more information about

this

impor-

tant

function of the recorder.

12.0

244

b'240

36,0

360

480

FIGURE

CLEAR

ENTRY

The CLEAR ENTRY

key

is used

when a mistake has been made

when

entering

a command to the

unit.

If,

for

example, you

wish to

set the lower

depth

limit to 500

feet,

and

by accident,

you press

509. BEFORE

you press

the

LOWER LIMIT

key, you

can

press

the CLEAR ENTRY

key

which

erases the

mistake,

and

allows

you

to re-enter the

correct

command.

DISCRIMINATION

Noise

pulses

are the

largest

complaint

most often received

about sonar

units. Lowrance has

had the

patented

Suppression

system

for

many years

which is

quite

effective at

eliminating

noise

from the

display.

The

only

draw-

back to the

Suppression

system

that it increases the

transmitter's

pulse length

which

decreases res-

olution and causes

targets

that are

together

merge

into one

"blob" instead of two

distinct

images.

Discrimination is a

program

installed in the X-16's micro-

processor

that enables it to

process

the

output

from the

receiver,

determine which

signals

are

noise and eliminate

them,

then

print only

the

legitimate

echoes.

Using

this

concept,

the transmit-

ted

pulse

does not have to be

increased,

therefore records with

high

resolution and

high

noise

immunity

can be achieved.

Discrimination is

interlaced with

Suppression, however,

and

some

suppression

is used

when

higher

levels of Discrimination are

chosen. For a

complete explana-

tion of

Suppression

and

Discrimination,

see the Advanced

Operation

section entitled

"Sup-

pression".

There are five levels of

Discrimination that can be

used.

(0)

is the lowest level whereas the

highest

value

(4)

is the

stron9est

level and should be used

only

when

severe noise is

present.

Another

advantage

of Discrimi-

nation is its

ability

to filter out

interference from other

depth

sounders. This allows

the simul-

taneous

operation

of a

digital

depth

sounder and the

X-16. Turn

both units on. If

interference from

Suppressor

level

using

the

Suppressor

control at

any

level

above 3. The

Suppressor

control

will

override the automatic

selec-

tion

that Discrimination chose. If a

suppression

level

greater

than 0 is

selected

the

operator,

then the

X-16 will

"F' after the

Discrimination level, For

example

the Discrimination

level is 1 and

the

Suppressor

level is

set

(or

"fixed")

then the

X-16 will

1 F'. This is a

reminder

that

some level of

suppression

in use.

(See Figure 43.)

—

lab

- 12.0

24.0

84,0

36.0

4S.0—

60,0FT——B1F--L0URAr1CE

OFT-j

FIGURE 43

PULSE

In the

Suppressor

section of this

manual,

explained

the relation-

ship

between

pulse

length

and

target separation.

pulse length

increases,

target separation,

pulse

length

increases,

target sep-

aration or

resolution is

degraded

but

deep

water

penetration

improves. However,

if the

pulse

width is

decreased,

resolution

becomes much better. The

X-16

allows

you

to take

advantage

this fact

by making

possible

override the initial transmitter

pulse length setting

from what

the

micro-computer

selects

according

to the

Lower Limit.

The initial transmitter

pulse

length

can be set from 30

1700

ps by entering

it on the

keyboard. By setting

the initial

transmitter

pulse

with to 100

jis,

three inch resolution is

obtained,

ps equivalent

to an inch and a

half,

and 30

initial transmit

pulse

length

equal

to one inch

resolution! No other

graph

recorder in the market

today

can

give you

this feature. After

setting

the initial transmitter

pulse length,

the Discrimination

function can be

used to eliminate noise and

still

have

good

resolution.

The X-16 will

display

the

initial

transmitter

pulse length

at the

bottom of the

paper

when

you

over-ride the

micro-computer.

distinguish

the initial transmitter

pulse

from the other information

printed

on the

paper,

the

graph

will

P=100

(if

the

pulse

is set

to 100

micro-seconds.)

A 50

initial

pulse length

would be dis-

played

as P=50.

(See Figure 44.)

NOTE: If a

pulse

length

110

micro-seconds or

less is chosen

the

operator,

the

Suppressor

disabled.

Also,

less than max-

imum

power

is transmitted

when

the

pulse length

less than 100

micro-seconds.

To set the initial transmitter

pulse length, simply press

on the

FIGURE 5 SENSITIVITY: TOO LOW

0.0

L\ 4

SENSITIVITY: PROPER SETTING

Figure

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Lowrance X-16 Manual

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