Eagle Mach 1 Specifications download pdf (Page 6)

lines

immediately.

Turn the

range

control back to

your original depth

setting.

To turn the lines back

on,

simply

reverse

the

procedure by turning

the

range

control to 10

feet,

hold

the marker switch

"ON",

and ro-

tate the

rnge

control to the 20

feet

position.

Lines will be

printed

on the

paper.

Return the

range

control

to the desired

depth

setting.

Scale

The numbers that indicate the

depth

or scale

may

be deleted if

desired. Rotate the

range

control

to the 60 feet

position,

hold the

marker control

"ON",

and turn the

range

control to the 40 feet

posi-

tion. The

depth

scale will no lon-

ger

printed.

The

range

control

now

may

be turned to the desired

depth setting.

To turn the

depth

scale back

on,

rotate the

range

control to 40

feet,

hold the marker switch

"ON",

and

rotate

the

range

control back to

the 60 feet

position. Remember,

the marker switch must

be on dur-

ing

the

period

of time that the

range

control is switched. Return

the

range

control to the desired

depth setting.

- -———-

--—--———-

- - -— — — ________-

—---

——— -

ERELE

—

bu--

Figure

34 SCALE "ON"

Transmit and Print Alternate

When

using

the

MACH 1 in

deep

water,

may

be desirable to slow

the

paper sped

down consid-

erably.

However,

when

doing

so,

you may get

'over

print"

very

dark,

heavy printing

over an area

that

is difficult to read. Much de-

tail can be lost due to this.

An available feature is the Trans-

mit

and Print Alternate function

which,

when

activated,

triggers

the

transmitter and causes the

stylus

every

other revolu-

tion instead of

every

revolution.

This

accomplishes

three

things:

1. Since the

stylus

only prints

ev-

ery

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 un-

desirable 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.

Suppressor

Control

The

Suppressor

Control is used

to reduce interference from noise.

Noise,

in electronic

terms,

any

undesired

signal.

It can be

caused

an electrical

source,

(such

as the

engine's ignition sys-

tem),

air bubbles in dis-

turbed water which is called

cavitation noise. In both

cases,

the noise could

produce

un-

wanted marks on the

paper. (See

Figure 7). Fortunately,

noise

—

—r

—— —________

-- P -

:..çj—TT1:

Iff...!J'1!Ijii —

.-1

- --—-

---——---————-EHIL

Figure

pulses

are

relatively

short in time

compared

to real sonar

signals.

Advancing

the

Suppressor

knob

will cause the

system

reject

these

unwanted,

short

pulses

without

reducing

the

sensitivity

any way.

However,

with

high sup-

pression settings,

the

graph

rec-

ord becomes coarse and the

ability

separate

fish from the

bottom or from other fish will be

decreased.

(See Figure 9).

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.

However,

it is

helpful

sometimes

to have

longer

pulse

widths when

noise is not a concern. When us-

ing

a sonar

deeper water,

it is

easier -for the unit to detect

a lon-

ger pulse coming

back from the

bottom or from the fish.

This is

called

"Probability

of Echo Detec-

tion".

The

probability

of the unit

being

able to detect

an echo re-

turning

from

deep

water is dimin-

ished because

the further the

Figure

EAGLE

Figure

SCALE "OFF"

PROPER SEllING

Figure

SUPPRESSION:

TOO HIGH

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