Sharp R-309B Instrukcje Operacyjne Pobierz pdf (Strona 8)

frequ

en

ci

es is av

ailabl

e be

twe

en

250 kHz

and 13. 5 MHz. T

he

o

utp

ut

lev

els of t

he

IF

s

igna

Is

are

continuous ly v

ari

able.

The

CE- 7

mu

st

oper

ate

with e

it

he

r a

Mo

de

l 301 Os

cill

os

co

pe

or

a Model 302 FM

Devi

ation

M

eter

ins

ert

ed

int

o

the

l

eft-h

and

plug- in cav ity ,

an

d a Mode l 303

Br

oadband

Mixe

r

or

one

of

the RF

plu

g-in

s

inserted

int

o th e

right-h

and

plu

g-in

cavit

y.

Th

e

co mbina

tio

n

ofth

e

plug-ins

is

at

the

discr

e-

ti on

of

the

custom

er.

1.2

Accessories

Thre

e t

ypes

of

acces

so r

ie

s

ar

e av a

ila

ble

f

or

us e

with

the

CE- 7: 1)

units

that

plug

int

o the m

onitor

and ob

ta

in

operating

power

from

it

; 2) ex te

rna

l

ins

trum

ents

j and

3) a uxil ia

ry

it

em

s s uppli ed

with

the

m

oni-

to r , but n

ot

in t

egr

al

p

arts

of

it.

1.2

.1

Plug-In

Unit

s

A

cav

ity ac ces

sib

le th

ro

ugh

an

openin

g in

th e l

eft-hand

par

t

of

th e

monitor

front

p

an

el

acce

pts e

it

he r th e M

ode

l 301 O

sc

i

llo

sc

o

pe

or

th e Mod

el

302 FM De

viation

M

et

er.

One or

th e other

of

the

s e

mu

st

be

us ed to

provide

FM

de

viation

mea

sur

ement

s . A

similar

cav

it

y in

the

right-hand

part

of

the

front

pan

el

acc

epts

a l\Io

de

1303

Broadband

Mix

er

or a

Model

304,

305,

or

306B

RF

Preselector.

Th

e

Model

301 O

sc

illosco

pe

permits

vi

sual

exam ina

tio

n of

exa

ct

modulation

of

t

he

tran

smitt

er

ca r r

ie

r . Unbala

nce

d

mo

du-

l

ati

on, p

ower-

s upply

puls

e

s,

unusua

l

clip-

ping, a nd

ot

he r p

rob

lem

s bec

om

e

imm

ed

i-

a

te

ly appa r ent

so

th

at

app

ro

pr ia

te

re

p

air

s

can

be

m ade. T

he

Mode

l 301 ha s an a

uto

-

m

ati

c sync ci

rcu

it ,

similar

to

that

found

in t

he

mo

st

ad

van

ced

labo

rato

ry

ins

tru

m

en

ts,

to l

ock

on and

pr

e

cis

el

y di s play

wa

veforms.

The

sco

pe g

ra

tic u

le

is

ca li

bra

ted to

sh

ow

de

vati

on on a

nyo

ne

of

thr

ee

ran

ges:

±

l.

5 kHz , ±5

kHz,

an

d ±15 kHz.

Swit

ch es

.on th e

front

pan

el p

ermit

us e of e

xtern

al

v

ertic

al

inputs

whil

e

using

the

internal

th e m

onit

oring

fun cti on f

or

r ou

tine

tes

ting ,

t

ro

ubles h

oot

ing, di

sp

lay

ing

Liss

aj

ous

p

at-

t

erns

,

et

c. The Os

cill

os cope c

an

a

lso

be

us

ed

for

r ec ei ver I

F-

b

an

dwi

dth mea

sur

e-

ment

and

discrimin

at

or

ali

gnment.

Th

e Mo

del

302 Fl\I Devi

ation

M

et

er

pr

o-

vi

des

thre

e

ran

ges:

0 to 2. 5 kHz, 0 to 6 kHz,

and 0 to 25

k Hz. An

inst

antane

ous-p

e

ak-

indi

cator

light

fl

ash

es

when

the

a b

so

lute

p

eak

de

viation

of th e inc

oming

carri

er

ex-

ceeds

an

amount

pr

e

set

by

the

operat

or.

Operation

and

acc

u

rac

y

of

the

p

eak

indic

at

or

are

not

affected

by

modulation

frequ

enc

y,

r

ep

etition

rate,

or

wav

ef

orm.

A

switch

p

ermits

selecti

on

and

m

easurement

of

eith

er

plu

s

or

minu

s devi

ati

on

pe

aks.

A

sco

pe jack

is

pro

vided

for

s im ulta

neo

us

meter

indic

a-

tion

s a nd o

scill

os

cop

e o

bse

rv a

tion

s

of

devi

a-

tion (a

se

p

arat

e o

sc

illo

scope

, no

ta

Mo

de

1301,

must

be

us

ed).

C

NOT E

r:

R

emote

dis p

lay

of FM

de

via

ti

on

f

is po

ssi

bl e

onl

y whe n th e Mod el

[f

,

302 FM D

evi

a tion l\Ie

te

r

is

us

ed.

Th

e Mod

el

303

Br

o

adband

Mi

xer

op

erat

es

on

all

frequen

ci

es co

ver

ed by th e

CE-7.

I:

Sens

itiv

ity

is

les

s

than

10

millivolt

s,

for

f

clos e- in

monitoring

and

in-shop

m

easure-

ments.

A

crystal

filt

er

in

the

broadband

r-

mi

s

er

pr

ovides

sha r p s

el

e

ctivit

y in

ar

ea

s

where

man

y s t

ro

ng

RF

signals

ar

e

pr

es

ent.

r:

f

Thr

ee

differ

ent

RF

Pre

s el

ect

or

plu

g-in

s

a

re

av

ailabl

e

for

use

in the CE- 7. Th e

Mode l

304

op

era

t

es

fro m 25 MHz to 50 MHz ,

r:

the

Model

30 5

fr

om

H5

MHz to

175

MHz,

and

t

heMode

l 306 B fr

om

450 MHz to 520

MHz.

Th

e s ensltiv ity of

these

pr

eselect

or

s

rei

•

is les s

than

20

mi

cro

v

olt

s and e

na

b

les

it to

monit

or

b

as

e s

tat

io

ns

up to 50 m il

es

away

.

•

Th

e p r

escle

cto

r s al

so

have a

cr

ys

t

al

filt

er

that

p

ermits

sha

rp

s

el

e

cti

vit

y.

I:

,

A

telephone

ja

ck

on

th e

front

p

an

el of th e

304

and

305

pres

ele

ct

ors

pe r m

it

s

use

of

an

s

wee

p.

External

si

gna

ls

ma

y a ls o

be

con-

ex ter na l

meter

f

or

r e

adin

g

the

AGC v

oltag

e,

ne

cted

to

the

horiz

ont

al

input.

This

per-

which

is

indicativ

e of th e l

evel

of

the

in-

•

mits

independent

use

of th e

Model

301

of

com ing

signal.

..

•

1-2

5 6

01"

0

015"1

I:

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