Marantz 2245 Specifications download pdf (Page 16)

TECHNIEAL

DESCRIPTION

GENERAL

Fiqure

9

is a block

diagram

of the [/]odei

2245

Receiver showing

the main

functional elements

and

input and output

signal

routing.

Each Afl and

Fß,4

front end has its own

lF stages.

For clarily,

onlv

the leJt audio channel

is shown;

the right

audio

channel

is identical.

The

|\4ONO switch

is common

to both chännels.

All audio controls

are

ganged,

or

con(entrically

clulched, to

lhplr coJnLelporls

il

the

righl channel.

The left channel

half o{

the

front

panel

dubbing

lN and dubbing

OUT

jacks

are

shown

interconnected

in this diagram.

The

right

cl-annel

of each

iacl

i\ wired

lo lhe san_e

circuit

point

in the

riqht channel.

11

FRONT

END

Fl\4 antenna

signals are applied

through a

balun

transformer

and the antenna

ATTENUATOR

switch

to the antenna coil

which drives

a fied-

effect

transistor RF amplifaer.

When

the AT-

TENUATOR

pushswitch

is

placed

in the

"out"

position

the attenuator

circuit is cut

oJf the

Fivl

siqnals

are direclly

fed to the

FIM

antenna

coil.

With

ATTENUATOR

pushswilch placed

in the

"in"

position,

the signals

are attenuated

about

20dB by

the attenualor

circuit, then

fed to the

antenna

coil. The signals

from the RF amplifier

are

{ed through the doubl+tlned

RF tank

circuit to

rhe FET

l\,4ixer stage, which is also

fed by the signal

J

Figure 9.

Functional

Block

Diagram

FUNCTIONAL

DFSCRIPTION

")

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 27 28

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