Sharp R-309B Betriebsanleitung PDF herunterladen (Seite 18)

_ _

3.4.2

CW.Signal

Gcncration

a.

S

et

the

CARmER

FREQUENCY

SELECTOR

to

the

desired

carrier

frequency.

b.

Place

the

function

switch

in

the

HARM.

AMP.

TUNING

position

and

adjust

the

HARM.

AMP.

TUNING

control

for

a

maximum

reading

on

the

FREQUENCY

meter.

The

HARM.

AMP.

TUNING

control

should

indicate

approximately

the

appropriate

number

recorded

on

the

Channel

Frequency

Chart.

c.

Place

the

function

switch

in

the

CW

position

and

z

ero

(mid-scale)

the

FREQUENCY

meter

with

the

CAL.

control

(inner

red

knob).

d.

Adjust

the

LEVEL

SET

control

to

the

SIG. GEN.

SET

LEVEL

number

listed

on

the

Channel

Fre-

quency

Chart

for

the

desired

car-

rier

frequency.

When

the

CE-7

is

directly

con-

nected

(via

the

20-dB

fixed

at-

tenuato

r) to a

transceiver,

its

transmitter

should

NEVER

be

keyed.

Any

input

in

excess

of

2

watts

will blow

the

fuse

in

the

20-dB

fixed

attenuator

and

may

damage

the

instrument.

e.

A

coaxial

cable

with

a

20-dB

fixed

attenuator

is

stored

inside

the

instrument's

front

cover

;

connect

the

cable

to

the

front-

panel

connector

marked

SIGNAL

GENERATOR

OUTPUT.

The

stgnat-gen

er

ator

attenuator

set-

tings

are

only

valid

if

the

20-dB

fixed

attenuator

is

used.

f.

The

desired

frequency

is

now

being

generated.

The

output

level

can

be

adjusted

by

means

of

the

Xl,

XIO,

XIOO

(Multiplier)

and

MICROV

OLTS

(Attenuator

Vernier)

controls.

'3.4.3

a.

b.

c.

d.

e.

FM-Signal

Generalion

Perform

steps

3.4.

2a

through

f.

These

steps

calibrate

the

CE-7

in

preparation

for

FM

signal

generation

.

1

4

" 4

Place

the

function

switch

in

the

FM

position.

I:

Set

the

DEV.

ADJ.

control

fully

~

counterclockwise.

I

-~

Zero

(mid-scale)

the

FREQUENCY

•

meter

with

the

FM

CAL.

control

(inner

red

knob).

I:

Set

the

FM

MOD.

switch

to

INT.

or

EXT.

as

desired.

In

the

I:

INT.

position

the

modulating

frequency

will

be 1 kHz;

exter-

41!!

nal

modulation

frequencies

can

I~

,

be

applied

through

the

BNC

connector

when

the

switch

is

in

the

EXT.

position.

When

the

FM

MOD.

switch

is

in

the

INT.

I:

position,

the

1

kHz

signal

is

avail-

~

able

at

the

1 k Hz OUT

connector.

The

level

of

the

1 kHz OUT

is

[,

adjusted

with

the

DEV.

ADJ.

,

control,

which

is

also

used

to

set

the

level

of

external

modulation

[~

applied

to

the

EXT.

connector.

,

NOTE

[:

The

FREQUENCY

meter

will

now

show

the

modulator

center

fre-

f!

quency

and

the

FM

Deviation

l\leter

[w

or

Oscilloscope

will

now

indicate

the

amount

of

deviation

of

the

gen-

•

erated

modulation.

The

FM

CAL.

lW

control

varies

the

center

freq

uency

ofthe

FM

signal

and

permits

testing

•

of

receivers

for

alignment

and

max-

imum

sens

itivity.

The

FREQUENCY

[.

meter

is

automatically

in

the

±5. 0

kHz

range

when

the

function

switch

is

in

the

FM

position,

and

it

cannot

"

[w

be

changed

by

the

±kHz

(FREQUENCY

lever)

.

•

3-6

5601"0015"1

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