Manual Lowrance X-70A (page 10 of 26) (English)

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2.Thesensitivitymaynotbehighenough. inorderfortheunittodisplay

CAUTION!

CLAMP ThE

TRANSDUCER CABLE TO

TRANSOM NEARThE

TRANSDUCER. This

WILL HELP PREVEIITTHE TRANSDUCER

FROM ENTERING THE BOAT IF ri IS

KNOCKED OFF AT HIGH SPEED.

LOCATION

3. Don't mount the transducer

directly

behind strakes or ribs

on the

bottom of the hull.

Typically,

good

location on aluminum

boats is

between the ribs closest to

the

engine. (See above.)

The

port

(left)

side

of the transom is

preferred

for

mounting

the

transducer,

however if

this is

not

possible,

the starboard

(right)

side can be used with

good

results.

4. Once

you

determine the

best location for the

transducer,

hold

the

bracket

against

the

transom. The transducer should be

roughly parallel

to the

ground.

The bottom of the

hull should be about

halfway

between

the centerline of the

transducer and it's bottom.

(See

the

illutration

below.) Swing

the

bracket

and mark the transom

through

the slots in

the transducer bracket. Now drill

two holes in the center of the

slots.

Use the #10 stainless steel

sheet metal screws

supplied

with the

trans-

ducer to

loosely

attach the

bracket to the transom.

a fish

arch,

it has to be able

to receive, the fish's echo from

the time it

enters the cone until

it leaves. If the

sensitivity

is not

high

enough,

the

unit

displays

the fish

only

when it is in the center of the cone.

Use the Zoom feature. It is

much easier to

display

fish

arches when

zoomed in on a small

range

of water than a

large

one. For

example, you

will have much better

luck

seeing

fish arches with a 30 to

60 foot

range

than a 0 to 60 foot

range.

This

enlarges

the

targets, allowing

the

display

to show much more

detail.

4. The

boat must be

moving

at a

slow

trolling speed

to see fish arches. If

the boat is

motionless,

fish

stay

in the

cone,

showing

on the

display

straight

horizontal lines.

NOISE

major

cause of sonar

problems

electrical noise. This

usually appears

the sonar's

display

random

patterns

of dots orlines. In severe

cases,

it can

completely

cover

the screen with black

dots,

or cause

the unit

operate

erraticly,

or not at all.

eliminate or minimizethe effects of

electrical

noise,

firsttryto

determine

the cause. With the boat at rest in

the

water,

the first

thing you

should do

is turn all electrical

equipment

on the boat off. Make certain the

engine

off,

also. Turn

your

X-70A

on,

then

turn off ASP

(Advanced

Signal

Processing).

There should be a

steady

bottom

signal

on the

display.

Now

turn on each

piece

of electrical

equipment

on the boat and view the

effect

on the

sonar's

display.

For

example,

turn

on the

bilge pump

and view the

sonar

display

for noise. If no

noise is

present,

turn the

pump off,

then

turn

on the

VHF radio and transmit.

Keep doing

this until all electrical

equipment

has been turned

on,

theireffect

on the

sonardisplay noted,

then

turned off.

you

find noise interference from

an electrical

instrument,

trolling

motor,

pump,

radio,

try

to isolate

the

problem.

You can

usually

re-route the

sonar unit's

power

cable and transducer cable

away

from the

wiring

that

causing

the interference. VHF

radio antenna cables radiate noise

when

transmitting,

so be certain to

keep

the sonar's wires

awayfrom

it. You

may

need to

route the sonar unit's

power

cable

directly

to the

battery

isolate

it from

other

wiring

on the boat.

If no noise

displays

on the sonar unitfrom electrical

equipment,

then

make

certain

everything exceptthe

sonar unit

is turned

off,

then startthe

engine.

Increase the RPM

with the

gearshift

neutral. If noise

appears

on the

GOOD LOCATION

TRANSOM

OF BOAT

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Lowrance X-70A Manual

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