Sharp R-309B Instrucciones de operaciones descargar pdf (Pagina 20)

3.4.6

Antenna

Installation

Remove

the

telescoping

antenna

from

the

front

cover

of

the

C

E-7.

Insert

the

telescoping

antenna

into

the

ANT.

connector

on

the

RF

plug-in

used

and

turn

the

connector

collet

until

finger-

tight.

When

removing

the

telescoping

antenna

from

the

ANT.

connec-

tor

DO NOT

rotate

the

antenna

before

loosening

the

connector,

otherwise

damage

will

result.

3.4.7

Installation

and

Removal

of

Crystals

The

following

procedure

should

be

followed

when

field

installation

or

re-

moval

of

frequency-determining

crystals,

inside

the

Crystal

Oven

Assembly,

be-

comes

necessary.

NOTE

The

CE-7

must

be

disconnected

from

the

AC

outlet

whenever

the

insulated

Crystal

Oven

Assembly

cover

is

re-

moved.

The

oven

is

energized

when-

ever

power

is

present.

a.

Place

the

CE-7

on

its

rear

panel

with

the

bottom

cover

toward

the

operator.

b.

Remove

the

six

bottom-cover

screws.

c.

Remove

the

four

screws

securing

the

insulated

Crystal

Oven

Assem-

bly

cover

. DO NOT

try

to

remove

the

center

screw.

d.

Install

the

new

cry

stalts)

in

the

desired

position.

NOTE

Be

careful

to

install

the

proper

frequency

crystal

for

the

desired

operating

fre-

quency.

The

correlation

between

cry-

stal

frequency

and

operating

frequency

is

shown

on

the

box

in

which

the

crystal

is

packed.

e.

RECORD

THE

POSITION IN

WHICH EACH CRYSTAL IS

IN-

STALLED

ON

THE

CHANNEL

FREQUENCY CHART.

f.

Replace

the

insulated

Crystal

Oven

Assembly

cover

with

the

four

screws.

g.

After

the

insulated

Crystal

Oven

Assembly

cover

has

been

replaced,

allow

the

oven

to

stabilize

its

temp-

erature

for

approximately

30

minutes.

h.

Calibrate

the

crystal

oscillator

according

to

the

instructions

con-

tained

in

Paragraph

5.4.2

and

Table

5-3.

i.

Replace

the

bottom

cover

with

the

six

screws.

3.5

Tur-n-Off

Procedure

To

turn

the

CE-7

off,

simply

place

the

VOLUME POWER

OFF

control

in

the

OFF

position.

If

possible

leave

the

AC plug

connected

so

that

the

Crystal

Oven

Assem-

bly

stays

on .

Unless

the

crystals

in

the

oven

are

kept

at

a

constant

temperature,

frequencies

will

vary

and

precise

meas-

urements

cannot

be

made

without

a

mini-

mum

warm-up

period

of 30

minutes.

3-8

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