Harman Kardon SR900 Owners Manual - Page 10

Should

you

receive

a

weak

stereo

signal

whose

quality has

been

degraded

by

noise

or

excessive

multipath,

the

special

STEREO

LOGIC

circuit

will

auto-

matically

change

the

mode

of

operation

of

the

receiver

to

monophonic

enabling

it

to

reproduce

an

undistorted

signal.

Should

you

desire

to

listen

to

this

stereo

broad-

cast

in

spite

of

noise

and

degraded

tone

quality,

place

the

function

selector

switch

in

the

FM

STEREO

position.

This

defeats

the

STEREOLOGIC

circuit.

STEREO

INDICATOR

LIGHT

A

stereo

indicator

light

is

located

directly

behind

the

FM

dial

glass

and

operates

in.

conjunction

with

the

STEREOLOGIC

circuit.

The

light

visually

indi-

cates

the

reproduction

of

stereo

through

your

receiver.

AUTOMATIC

STEREO

ADJUST

CONTROL

This

control,

located

on

the

rear

panel,

has

been

factory

adjusted.

and

should

not

require

further

readjustment.

It

adjusts

the

level

at

which

the

automatic

logic

circuit

will

switch

your

receiver

from

stereophonic

to

monophonic

operation.

If

it

is

necessary

to

re

-adjust

this

control

the

following

procedure

should

be

followed.

Tune

to

the

weakest

stereo

station

which

you

desire

to

hear

stereo-

phonically.

Slowly

rotate

the

automatic

stereo

adjust

control

counter

-clockwise

to

the

point

at

which

the

stereo

indicator

light

on

the

front

panel

goes

out.

Then,

slowly

rotate

the

control

clockwise

to

the

point

at

which

the

light

goes

on.

This

is

the

point

at

which

the

control

should

be

set.

INTERCHANNEL

MUTING

THRESHOLD

ADJUSTMENT

This

control

is

located

on

the

rear

of

the

chassis

and

should

be

adjusted

as

follows:

Tune

in

the

weakest

station

in

your

area

with

the

front

panel

FM

Muting

switch

in

the

"OFF"

position.

Tune

off

the

station

and

throw

the

FM

Muting

Switch

"ON".

Rotate

the

"Muting

Adjustment"

clockwise.

Then

rotate

counter-

clockwise

until

only

a

faint

hiss

is

heard.

Tune

in

again

to

the

weak

signal.

If

it

still

can

be

heard,

and

noise

present

off

station

is

negligible,

the

adjustment

can

be

considered

satisfactory.

NOTE:

Maximum

sensitivity

is

obtained

with

the

FM

Muting

Switch

in

the

"OFF"

position.

Special

c9

echnical

gniormation

DIAL

SCALE

The

SR900

Dial

Scale

is

marked

with

two

scales,

a

frequency

scale

(88-

108

MC),

and

a

logging

scale

(0-100).

Since

most

FM

stations

operate

on

fre-

quencies

which

arc

not

whole

numbers

(such

as

96

MC

as

compared

to

96.3)

ideally

each

megacycle

division

on

the

frequency

scale

should

be

divided

into

10

parts

to

enable the

user

to

pinpoint

the

location

of

the

station.

This

would

require

a

dial

scale

which

would

be

longer

than

the

front

panel.

The

logging

scale

which

is

divided

into

l00

equal

parts

provides

a

means

of

finding

your

favorite

station,

once

you

have

noted

its

position

on

the

logging

scale.

For

example,

in

New

York

City,

WQXR

operates

on

96.3MC.

After

locating

this

station

through

the

use

of

the

frequency

scale

(between

96

and

98

MC),

you

find

that

the

pointer

falls

on

46

on

the

logging

scale.

Make

a

note

of

this

setting

and

when

you

next

want

to

tune

to

WQXR,

all

that

is

necessary

is

to

set

the

pointer

to

46

on

the

logging

scale.

EQUALIZATION

In

order

to

achieve

good

reproduction

of

the

wide

range

of

frequencies

in

music

and

to

make

necessary

adjustments

for

the

limitations

of

the

recording

technique,

record

manufacturers

have

found

it

necessary

to

modify

the

actual

frequency

response

of

the

music

while

it

is

being

recorded.

Thus,

to

avoid

over

-

cutting

and

consequent

distortion,

a

measured

and

deliberate

reduction

is

effected

in

low

frequency

response

by

selecting

a

"turnover

frequency"

and

by

recording

attenuated

response

below

that

point.

To

assure

optimum

signal

to

noise

at

the

high

frequency

end

when

the

record

is

played

at

home,

the

highs

are

deliberately

exaggerated

during

the

recording

process.

A

measured

and

deliberate

boost

is

effected

above

a

certain

frequency.

'Phis

combination

of

deliberate

exaggeration

at

the

low

and

high

ends

of

the

frequency

'espouse

can

be

expressed

in

a

recording

curve.

When

the

record

is

played

a

mirror

image

of

that

curve

should

be

available

so

that

the

ideal

"flat"

response

may

be

achieved.

The

TAPE

HD

and

PHONO

positions

of

the

Function

Selector

automatically

select

the

proper

equalization

that

is

required.

Harman Kardon SR900 Owners Manual - Page 10

Stereo, Indicator, Light, Automatic, Adjust, Control, Interchannel, Muting, Threshold, Adjustment,

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