QUAD FMA Instruction Book

F'M4

TIJNER

INSTRUCTION

BOOK

QUA

D

OURDFMA.

Tuner

INSTRUCTION

BOOK

CONTENTS

mber

Accessories

service.

..::.:.

::1: ii

;

Guarantee

......

.. .2

lntroduction

........3

Brief

Instructions .

..... ...3

lnstallation

.........4

Connections.....

.........4

Operation

..........7

Deemphasis.. ....

........9

Specification.....

.

........9

U.K.

Transmitters..

.......12

ouAD

ELECTROACOUSTICS

LTD.,

HUNTINGDON, Cambs., PE18 7DB.

Telephone No.:

Huntingdon

(0480)

52561

Telex 32348

QUAD

G

Quad

is a registered trade

mark

orF4SEC

rSS 6

Accessories The FM4

is suPPlied

with

1 x

A.C. Lead

1 x Signal

Lead

1 x

Aerial Connector

Service

lf servicing

is required

the

tuner

should

be

returned

to

the supplier'

the

distributor

lor

the country

of

purchase

or to Quad

Electroacoustics

Ltd.

A brief

note should

be enclosed

giving

your

name

and

address

and

the

reason

for returning

it.

QUAD

offers

same-day

service

from

Monday

to

Friday except

tor bank

holidays.

The

map below

shows

where

to find us.

Please

call 0480

52561

to

make

an appointment.

IMPORTANT

THE CARDBOARD

CARTON

AND EXPANDED

POLYSTYRENE

PACK

SHOULD

BE RETAINED

IN

CASE

THE UNIT

HAS

TO BE

RETURNED

TO

THE

MANUFACTURER

OR

DISTRIBUTOR

FOR

SERVICE.

Guarantee

This

tuner

is

guaranteed

against

any defect

in material and

workmanship

for a

period

of

twelve

months

from

the date

of

purchase'

within

this

oeriod

we undertake

to supply

replacement

parts

free

oi charge

orovided

that

failure

was not

occasioned

by

misuse,

accident

or

negligence.

Freight

and

labour

costs

are

not covered

unless

by

local agreement'

Witnin

tne

U.K. the

guarantee

offered

with this

equipment

does

not

limit

the

consumeds

existing

statutory

rights.

A

separate

guarantee

card

is not

supplied

with

your

Quad

unit.

Your

guarantee

begins

on the

day on

which

you

take deliverY.

circuit

diagrams

and

service

data

for this Quad

product

are available

from

the

manufacturer

or distributor

{or a small

charge.

QSPESSA QP2P2SA PPL734A

INTRODUCTION

The

Quad

FM4 is

a self

powered

stereo

tuner covering the FM band

(88

-

108

MHz) only and designed

to

be used

in

conjunction

with

Quad

and

similar high

quality pre.amplifiers.

The entire operation of the

tuner is

controlled by a

microprocessor

so

that

the only controls on the

tuner

are an on/off switch,

tuning knob, and

preselector

buttons.

Up to seven stations can be stored

in

the tunef s

memory

and

recalled

at

the touch of a button.

Manual tuning

is

accomplished

in the normal manner in the sense that the

tuning

knob is turned

clockwise

to move

up

the frequency band and vice

versa. The frequency tuned

is

displayed digitally and a bar

graph gives

simultaneous

indication of

signal

strength and

centre

channel tuning.

BFIEF

INSTRUCTIONS

Plug the

A.C.

and signal leads supplied

into the

Quad

Control Units and

FM4.

Connect a suitable 75 o aerial. Switch on. Press

lwl.

Tune in desired station. See

list

at

the

back of

this

book.

Press and hold

Fwl

and

press

desired

preset.

When red LED extinguishes

and

green

LED lights,

station

is

stored

in the

tunef s memory.

INSTALLATION

The

Quad

FM4

may either be used

free

standing

or

mounted

in

a cabinet

panel

of up

to 15

mm thick.

lf it

is to be

panel

mounted cut

a rectangular

aperture 312

mm

x 56 mm

in

the oanel.

Remove the

two screws

from the

rear of the cover

and slide

the cover

off.

Insert

the tuner

into the aperture

from the front,

replace the cover

trom

the

rear, insert the

two screws

and tighten until

finger tight and

then

give

one

additional

half turn to each

screw

to lock securely.

The tuner requires

no ventilation.

CONNECTIONS

The

FM4 is supplied

with

leads and connectors

Jor drrect

connection

to the

Quad

Control

Unit.

A.C.

Mains Supply

This tuner

is designed

to operate

on one range

of A.C.

mains voltage only,

50

or 60

Hz,

either

110/120 volts or

220/240 volts.

The designed

operating

voltage ol

the tuner

is clearly

marked

on the

back,

BEFORE CONNECTING

TO

THE A.C. SUPPLY CHECKTHATTHE

VOLTAGE

MARKED ON

THE

BACK CORRESPONDS

WITH THAT OF

THE

A.C. SUPPLY.

The

A.C. mains input

is via the standard

3-pin

Euro

connector

supplied

wired in accordance

with the

international code

(see

Fig. 1) and will

normally

be drawn

from the

outlet on

the rear of the

Quad

pre-amplifier.

Live

(Brown)

Neutral

(Blue)

Fig. 1

A.C. lrlout Connector

CEE22

A surge-resisting

fuse

(63mA

for 220/240V,100mA

for 1 10/1

20V) housed

in

the mains

input

receptacle

in the rear

panel

provides

the usual

protection.

To

obtain access

to

the fuse, unplug

the mains supply

and use a

small

screwdriver

to lever open

the drawer

carrying

the

fuse.

(see

Fig. 2).

lf a replacement

fuse has

to be litted,

make sure

that it is of the correct

type.

The marking

will be

T63mA

(T1

00mA

for 1 10V).

Fig.2

An

unswitched

A.C.

outlet

supplies

appropriate additional

equipment and the shrouded

plug

supplied

with

the amplifier

(wired

as

shown in Fig.

3) is for

use

with this

outlet

(see

Fig. 4).

The maximum

steady

state

current

drawn

from

the A.C. outlet

should not

exceed 4 amps.

Live

(Brown)

Earth

(Green/Yellow)

Neutral

(Blue)

Fig. 3 A.C. Output

Connector CEE22 cable

ended

plug.

Fig.

4

A.C. and

signal connections for

a typical

Quad

installation.

5

Aerial

The

performance

of the FM4

is

entirely dependent

upon

the

signal

strength

received

from the aerial. Optimum

signal

to noise will be

achieved

with

a signal

strength

o{ between

1 mV and 100mV and

not in excess

of

500mV.

Your

local aerial contractor

or

Quad

dealer

will be able

to advise

on the

antenna

system

which will

give

the

best

results

in

your

area, but

in most

cases a correctly

orientated external

multi element

array

will

give

best

results.

The FM4

is

designed

to operate

from a standard

75o cq'axial

feeder,

and

indoor ribbon aerials

should

not be used.

Output

Signal output

is via

phono

sockets,

clearly

marked L

(left)

and

R

(right).

lf the tuner

is used

with

a Quad

33/34/44 control

unit

with a DIN

input

socket,

you

will

need a S-pin-DlN-to-2-phono-plugs

lead. This

may be

obtained

from

QUAD,

or

your

dealer

by

quoting

part

number

QDsFP2A.

The output of the

FM4 is nominally'1 00mV

for 300/o

programme

modulation.

Controls

The

Quad

FM4 is equipped

with an on/off

switch, a

tuning knob, seven

preset

station selection

buttons, and

a manual

F*l

button

which is also used

in

conjunction

with one

of the

preset

station

buttons

to store a desired

frequency in the tune/s

memory.

The tuned frequency

is displayed

digitally and

a twin bar

graph

provides

simultaneous

indication

of signal strength

and centre

tuning. Stereo

transmissions

light the stereo

indicator.

All other functions

are controlled

automatically

by the microprocessor'

With

manual

l**lselected

interstation

muting and

AFC are switched

out enabling

all stations,

whether strong

or weak

to

be

tuned

in. When a

preset

station

is

selected

the

tuner is automatically

muted until

the desired

station

has been

correctly

tuned.

The FM4

remembers

the last station used

and automatically

reverts

to it

when switched

on.

The FM4 supplied

in the U.K.

is

provided

with

preset

station

buttons

marked:-

[-Gl

-

For a fourth

BBC

VHF Channel

(where

available)

l-Etrl-

BBC

Badiol/2

lBEcl

-

BBC Radio

3

lry]

-

BBC

Radio 4

f

\R-l

-

lndependent

local Radio 1

[,.I-]

-

Independent

local Radio

2

[.4c-l-

seC Local

Radio

FM4s

supplied

to the

rest of

the world

have

preset

buttons

marked

f;-l

to

I-'--1.

o

Iti*,".

OPERATION Manual tuning

Press

the.l'^il button.

The red LED will light. Any

desired

frequency can be

tuned

using

the tuning knob. Interstation muting

and

AFC are automatically

switched out

and

all

incoming stations can

be

tuned in however weak the

signal.

The bar

graph

indicates the signal strength of the station and

when

properly

tuned both sections

will

be of equal height.

lf

the

left

section

is

shorter than the

right it is

simply

necessary to tune to the right and vice versa.

When all but the top segments of the

bar

graph

are lit the incoming signal

strength

is

sufficient

to

provide

optimum signal to noise.

(Approximately

1 mV).

Bar

Graph

tro

\

lr

I

ll, tt I

rl

\

tl

I

rr

I

tr

I

!r

I

rt

I

trtr

I

oo I

88l

rl

t

rr

I

rr

t

rl

I

ll

I

TI

I

trtr

\

otr

|

"'8

|

trB t oo

I os I ll

I Ir

I

tl

I

Approximate

Signal

Strength

1 mV

(60

dBD

100pV

(a0

dBD

1OpV

(20

dBD

Signal/Noise Stereo

70dB

55dB

30dB

Storing a Station

Once

a station

has been

correctly

tuned it can be

stored

on any of

the

preset

positions

simply by

pressing

and

holding

down

the

F*]

button

and

pressing.the

required

preselect

button until

the

red

LED extinguishes

and

the

green

LED of

the chosen

preset

lights. This takes

approximately

one

second.

Both buttons

are then

released.

The selected

frequency

is now stored

in the

tuneis

memory and

will be

recalled

whenever

the

pre-selected

button

iq

pressed.

To change

the

frequency

stored

in

any

preset position

select

lru*

|

,

tune

in the

desired station,

press

F*l

and

hold,

press

the

preset

button until

the

green

LED

lights.

The old station

is deleted

from

the

memory and

the

new one stored.

For example,

to

store Radio

3 Wrotham

91 .3mHz

on the

preset

[E

-l

proceed

as follows

-

Press

li'*l'

Tune to 91

.3mHz. Observe

that both sections

of the

bar

graph

are

the same

height, the

height

indicating signal

strength

(see page

7).

Press

and

hold

Fw

I

.

Press

lE6-l

until

the

green

LED lights.

Release

F^il

ano

I

E"

I

.

A list of BBC and

IBA transmitters and

frequencies is

given

at the end

of

this book.

Preset

tuning

Once a transmitter

frequency

has been selected

and stored

in each of

the

seven

preset

memory

positions,

manual

tuning will be an exception

and

operation of

the tuner

is

extremely

simple. Switch

on the

Quad

Control

Unit

and

the FM4.

The Control Unit

will automatically select

RADIO and

the

FM4

will tune

into the station

last used.

To

select

any of

the other six

preset

stations

press

the appropriate

pushbutton.

When the

FM4 is switched

off the memory

is

powered

by

a small battery

which

is recharged

whenever the set

is on. The

memory will

retain stored

stations

for about five

years

if the set

is not

used

at all.

Under

normal use

the life of the battery

is about

ten

years.

lf

for

any

reason,

the FM4 is

not

used

for a

long

period,

and the

battery

runs

down

it

will

be

necessary

to reload

the memory

with

preset

stations.

The battery

will be

automatically

recharged

while the set is on.

lf the battery

is flat the tuner

automatically

reverts

lo manual TUN

E.

Mono

When

listening to a very

weak station

(typically

3 to 4 segments

of

the bar

graph

illuminated) a

significant

improvement in the

signal to noise

can be

made by switching

the

Quad

control unit

to

MONO and centring

the balance

control

for minimum

noise. Remember,

however, to switch back

to stereo

when changing stations. 8

De-Emphasis

FM

broadcaSts are

preemphasised

(accentuation

of the higher

frequencies)

prior

to transmission

and must

be deemphasised

at the receiver

to restore

the

correct tonal

balance.

(This

is simifar

to the record

equalisation

procedure

with discs). The

correct deemphasis

for

Britain

and Europe is

Soprsec

and for North

America 7spsec.

Normally

this will

have

been

correctly

set

prior

to

purchase

but the

SOpsec equalisation

can

be easily

converted

to 7spsec

by adding

a capacitor

of 3.3nF in

parallel

with

each of

the existing

correction

capacitors

C44

and C45. These

additional capacirors

may

be most

conveniently located

on the

underside of the

printed

circuit

board.

SPECIFICATION

Frequency

range

Sensitivity

-

30d B

quieting

50dB

quieting

Full

Limiting

Signal/Noise

-

Input

signal 1 kHz

at

1mV. A weighted

Distortion

-

Input

signal

1 kHz + 75kHz

+

25kHz

Selectivity Capture

Ratio

lF Rejection

AM

Suppression

lmage

Reiection

Pilot

Tone

Suppression

Crosstalk

at l kHz

Frequency

Response

-

2OHz-1SkHz

Output Level

3096 Modulation

Source

lmpedance

Recommended

Load

lmpedance

Aerial

Input De-emphasis Power

Input

Dimensions

Weight

88-1 08 M Hz

Mono

1pV

Mono

2.7

p.Y

Stereo 25p,V (

lptV

Mono

76dB

Stereo

70dB

Mono

0.1 5olo

Stereo

0.15olo

Mono

0.05o/o

Stereo 0.1

0olo

53dB

1.5d8 1

00dB 60dB 80dB 60dB

-40d8 +0

-1dB

'100mV 1 00o

> 20ko

75o

unbalanced SOprSec or 75pSec 1

00-1 25 or 200-250V.

50-60Hz

6VA.

321

mm

wide

64mm high

207mm

deep.

3 Ks.

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