Cadence ZRS C8 Instruções de Operação descarregar pdf (Página 45)

Ai

+r.5

v

Dc

Bf

+90

v

Dc

s tol

sEcr.4

/

REAR

\

sro3

ì'sEcT. 2

Section

I l.

51.

Block

Diogrom

(fig.

23)

n.

Radio

Receiver

R-174IURR

is

a

portable

receiver

operating

over

a

frequency

range

of

1.ó

mc

to 18

mc.

Either

a-m

or

c-w

signals

nrril'

be

received.

The

signal

path

is

shown

in

rìgule

23.

Ò.

The

signal

voltage

induced

in

the

antenna

:.

iimpiified

by

r-f

anrplifler

stages

V1

and

\r2

!',,nnectecl

in

cascade,

and the

amplified

signal

.-

ioupled

into

converter

tube

VB.

The

antenna,

:

atr-rpÌifier,

and

converter

inpnt

circuits

are

'

rìf(l

manLìally

to the

radio-frequency

signal.

.

l,,call1.

generated

signal,

u'hich

tracks

4bb

rrbove

the

received

signal,

is mixed

elec-

::ically

with

the incoming

signal

in

the con-

R ro8

roo

NOTES:

I.

UNLESS

OTHERWISE

INDICATEDI

ALL

RESISTANCE

VALUES

ARE

IN

OHMS.

2. SWITCH

SECTIONS

DESIGNATED

NO.

I

ARE

NEAREST

THE

KNOB

END.

3.

CONTACTS

OF KIOI

NORMALLY

CLOSED.

4.

qwllgl!_sEcl0NS,

AS

vtEWED,

ROTATE

c0uNTERcLocK

wlSE.

+

t.4v Dc

FILAMENT

VOLTAGE

TESÎ

POINT

J

3LO"),\

REAR

I

powrn

I

lselrcron

I

Figure

22. Pott'er

Supply PP-S08lLf

RR,

clry-batterg

operation,

ftmctíonal

sch3m(ttic.

RADTO

RECETVER

R-t74lURR

verter

stage.

The

output

of

converter

tube

VB

is

tuned

to

the

difference

frequency (4Sb

kc),

and

this

signal

is

supplied

to

the first

i-f

ampli-

fier

tube,

V4.

c.

The

455-kc

i-f

signal

is

amplified

succes_

sively

in the

first

and

second

i-f

stages,

V4

ancl

V5 respectively.

The

i-f

output

of Vb

i-q fecl

to

the

diode

section

of

tube

V6.

d.

The

diode

section

of

V6

rectifies

the i-f

signal,

and

a detected

audio

signal

is

conpìccl

t.o

the

pentode

section

of

V6.

Auclio

aniltlifìt,atiotr

is

provided

by

the

pentode

section

of

\-li

:rncl

b1'

either

Y7

or

V8. The

output

of

ejther' \-7

or'

\'g

is

supplied

through

OUTPUT

HICIH-LO\V

switch

54 to

the PIIONtrS

connector.s

at-rrl

the

loudspeaker

in

Pou'ei'

SLrppì1- PP-308

URR.

rM

295-23

37

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 129 130

Comentários a estes Manuais

Sem comentários