Harman Kardon 150 Owners Manual - Page 10

QUIETING

METER

"Quieting"

is

a

term

used

in

the

measurement

of

the

relative

signal

to

noise

ratio

of

a

broadcast

signal.

Conventional

signal

strength

or

center

channel

meters

do

not

indicate

the

quality

of

the

received

signal

—

simply

their

strength

and

pass

band

accuracy.

Harman-Kardon's

extraordinary

QUIETING

METER

actually

indicates

or

"reads"

the

signal-to-noise

ratio

or

the

QUALITY

of

the

received

signal.

Maximum

deflection

of

this

meter

(highest

number)

represents

the

best

listening

point

within

the

pass

band.

As

you

detune

closer

to

the

edge

of

a

station's

pass

band,

the

QUIETING

METER

will

immediately

reflect

the

increased

noise

and

distortion.

The

QUIETING

METER

will

"ALWAYS"

agree

with

what

you

hear

and

will

"ALWAYS"

indicate

the

best

tuning

point.

STEREO

INDICATOR

A

stereo

indicator

is

located

adjacent

to

the

quieting

meter

and

operates

in

conjunction

with

the

STEREO

FM

position

of

the

Function

switch.

The

indica-

tor

visually

shows

the

reproduction

of

FM

stereo

through

your

receiver.

To

tune

for

FM

stereo

proceed

as

follows:

1.

Place

the

function

selector

switch

in

the

STEREO

FM

position.

2.

Tune

to

the

station

of

your

choice

using

your

quieting

meter

for

precise

and

accurate

tuning.

Your

stereo

indicator

will

now

show

if

you

are

tuned

to

a

stereo

program.

If

the

indicator

is

off,

the

program

you

are

listening

to

is

being

broadcast

monophonically.

IN

TUNE

INDICATOR

The

"IN

TUNE"

indicator

is

located

adjacent

to

the

quieting

meter

and

operates

in

conjunction

with

the

"STEREO

FM"

and

"FM"

positions

on

the

function

switch.

When

properly

tuned

to

the

station

of

your

choice,

the

"IN

TUNE"

indicator

will

light.

ANTENNA

ORIENTATION

If

your

antenna

system

uses

a

rotation

device,

the

best

antenna

orientation

will

be

achieved

when

the

QUIETING

METER

indicates

the

greatest

steady

deflection

(highest

number).

Rotate

the

antenna

in

the

general

direction

of

the

transmitting

station's

antenna

and

observe

the

QUIETING

METER

to

make

fine

adjustments

of

the

antenna's

position.

9

DIAL

SCALE

The

dial

scale

on

your

receiver

is

marked

with

three

scales,

an

FM

fre-

quency

scale

(88.108

mc),

a

logging

scale

(0-10)

and

an

AM

frequency

scale.

Since

most

FM

stations

operate

at

frequencies

which

are

not

whole

num-

bers

(such

as

96

Hz

as

compared

to

96.3

Hz).

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

han

the

front

panel.

The

logging

scale

which

is

divided

into

100

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

at

96.4

Hz.

After

locating

this

station

through

the

use

of

the

frequency

scale

(between

96

and

98

Hz),

you

find

that

the

pointer

may

fall

on

4.2

on

the

logging

scale.

Make

a

note

of

this

setting.

For

future

tuning

to

WQXR

simply

set

the

pointer

to

4.2

on

the

logging

scale.

EQUALIZATION

In

order

to

achieve

good

reproduction

of

the

wide

range

of

frequencies

in

music

and

to

make

necessary

adjustment

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

overcutting

and

consequent

distortion,

a

measured

and

deliberate

reduction

is

effected

in

low

frequency

response

by

selecting

a

"turnover

frequency"

and

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

affected

above

a

certain

frequency.

This

combination

of

deliberate

exaggeration

at

the

low

and

high

ends

of

the

frequency

spectrum

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

PHONO

1/PHONO

2

positions

of

the

function

switch

automatically

in-

troduces

the

proper

equalization.

HUM

AND

NOISE

In

any

high

fidelity

installation,

hum

may

be

caused

by

the

interconnection

of

a

record

player,

tuner

and

amplifier,

as

a

result

of

the

cables

and

different

grounds.

If

hum

is

experienced

with

your

receiver,

disconnect

everything

but

the

speakers

from

the

receiver.

If

hum

persists,

reverse

the

AC

line

cord.

Plug

in

the

record

player

and

if

hum

appears,

reverse

the

record

player power

plug

and

connect

a

single

lead

from

the

record

player

chassis

to

the

ground

post

on

the

rear

of

the

receiver

chassis.

Connect

your

other

devices

in

this

manner.

CAUTION:

Hum

may

also

be

induced

by

defective

connecting

cables

or

by

running

these

cables

too

close

to

a

strong

AC

field.

Harman Kardon 150 Owners Manual - Page 10

Quieting, Meter, Stereo, Indicator, Antenna, Orientation, Scale, Equalization, Noise

Page 10 highlights