Harman Kardon T300X Owners Manual - Page 10

Connecting

The

FM

Antenna:

Due

to

the

exceptionally

high

sensitivity

of

the

T300X,

an

ordinary

piece

of

wire

48"

long

will

he

sufficient

antenna

for

all

but

the

most

difficult

locations.

One

end

of

this

wire

should

be

stripped

of

insulation

and

fastened

to

the

FM

terminal

on

the

ANTENNA

TERMINAL

strip

located

on

the

rear

panel.

The

other

end

of

the

wire

should

be

extended

horizontally

and

tacked

or

stapled

into

place.

If

an

external

antenna

is

required,

use

a

folded

dipole

or

Yagi

cut

for

the

FM

band.

At

times

a

TV

antenna

may

be

also

used

with

satisfactory

results.

Attach

the

300

ohm

lead-in

wire

to

the

FM

and

GROUND

terminals

on

the

rear

of

the

tuner.

Connecting

The

AM

Antenna:

The

ferrite

loopstick

antenna

used

in

the

T300X

comprises

all

the

antenna

required

for

good

signal

areas.

In

more

remote

locations

an

additional

outdoor

antenna

may

be

required.

This

should

consist

of

a

single

wire,

as

long

as

is

reasonably

practical.

It

must

be

kept

away

from

power

lines

and

metal

objects

to

insure

reception

without

extraneous

noise.

Connect

one

end

of

the

AM

outdoor

antenna

to

the

terminal

marked

AM

on

the

ANTENNA

TERMINAL

strip

on

the

rear

panel.

Grounding:

It

is

not

generally

recommended

to

ground

your

T300X

tuner

to

its

com-

panion

amplifier

as

this

may

result

in

a

ground

loop

which

will

introduce

hum

into

your

system.

OPERATING

INSTRUCTIONS

Turning

The

Tuner

On

and

Off:

The

power

on/off

switch

is

located

on

the

front

panel

near

the

tuning

control.

To

turn

the

tuner

on,

merely

throw

the

slide

switch

to

the

"ON"

position.

Automatic

Frequency

Control

Switch:

FM

broadcasting,

by

its

very

nature,

eliminates

almost

all

natural

and

man-

made

static.

However,

the

characteristics

of

FM

which

make

this

possible

also

causes

specific

problems

in

tuning.

The

T300X

incorporates

a

special

electronic

circuit

known

as

AFC

(automatic

frequency

control)

that

overcomes

these

prob-

lems

and

insures

proper

tuning

even

if

the

manual

tuning

is

not

accurately

done.

Therefore

AFC

always

keeps

the

station

in

the

center

of

the

channel

and

eliminates

distortion

caused

by

inaccurate

tuning.

It

should

be

made

quite

clear

that

AFC

is

not

a

means

to

eliminate

tuner

drift.

A

fi

ne

wide

band

tuner

will

not

drift

even

upon

warm-up

whether

AFC

is

in

the

circuit

or

not.

The

following

experiment

will

lead

to

an

understanding

of

AFC

and

how

it

performs

its

job.

Throw

the

AFC

switch

located

on

the

front

panel

to

"ON".

Now

tune

across

the

FM

band

and

note

how

the

stations

"pop"

into

place.

Now

tune

to

any

station,

preferably

one

with

a

musical

program

Defeat

the

AFC

circuit

by

throwing

the

AFC

switch

to

"OFF",

and

tune

slowly

through

the

station

from

left

to

right.

Notice

there

are

three

distinct

points

where

the

station

sounds

clear,

interspersed

with

points

of

distorted

sound.

The

middle,

clear

-sounding

point

is

the

proper

tuning

position

fo

rthe

best

tone

quality

with

minimum

noise,

distortion

and

inter-

ference.

Detune

the

station

slightly

so

that

the

sound

is

distorted.

Now

throw

the

AFC

switch

"ON"

and

notice

how

the

station

retunes

itself

and

the

sound

clears

up.

The

AFC

circuit

has

readjusted

the

electronic

circuits

to

the

center

of

the

station

channel.

8

Harman Kardon T300X Owners Manual - Page 10

Connecting, Antenna, Grounding, OPERATING, INSTRUCTIONS, Turning, Tuner, Automatic, Frequency,

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