Gates M6467 Manuel utilisateur

Steam Powered Radio.Com

..

,

f

~~-

~t-

.

,-

\

'

..

-

M6467

FM

TOP

LEVEL

AMPLIFIER

'

GATES

OATES

RNDIO

CO

M

PANY

A

Subsidiary

of

Harris-lnterty,,. Corporation

QUINCY, ILLINOIS, 62302

,...,

,,

r

'

..

-

;'

..

-.

,.

,- '

l ,

•,.:t

i

'...,.-:

.,,

l

.

/

.

'

\

I

t

·JI--,

I

Steam Powered Radio.Com

REPLACEMENT PARTS

When

ordering

replacement

parts

please

address

your

order

to

:

GATES

RADIO COMPANY

Order

Department

Quincy, Illinois

62302

The

following

information

must

be

supplied

if

applicable:

(1)

Quantity

required.

(2)

Gates

Part

Number-Ten

digit

I.B.M.

or

M

number

.

(3) Item

or

Symbol

Number

from

Instruction Book schematic

or

Parts List.

(4)

Type

Number

of

equipment

in

which

component

is

used.

(5)

Complete

address

for

shipping

and

billing

instructions.

RETURNS

AND

EXCHANGES

Do

not

return

any

merchandise

without

our

written

approval

and

Return

Authoriza-

tion.

We

will

provide

special

shipping

labels

and

a

code

numbe·r

that

will

assure

proper

handling

and

prompt

issuance

of

credit.

Please furnish a

detailed

report

to

assure

prompt

handling

of

returned

merchandise. Custom

built

equipment

or

mer-

chandise

specially

ordered

for

you

is

not

returnable.

Where

return

of

standard

.

equipment

is

allowed

by

Gates,

a restocking

fee

of

15%

will

be

charged.

All

returned

merchandise must

be

sent

freight

prepaid

and

properly

insured

by

the customer.

When

writing

to

Gates

Radio

Company

about

your

order,

it

will

be

helpful

if

you

specify

the

Gates

Factory

Order

Number

or

Invoice

Number

.

MODIFICATIONS

•

Gates

reserves the

right

to

modify

the design

and

specifications

of

the

equipment

shown in this Instruction Book

without

notice

or

to

withdraw

any

item

from

sale

pro-

vided,

however,

that

any

modifications

shall

not

adversely

affect

the

performance

of

the

equipment

so

modified.

/

Steam Powered Radio.Com

---

--

----·

·

)

-"""--

INSTRUCTIONS

M6467,

FM

TOP-LEVEL

AMPLIFIER

IB-888 0890 001

August -

23,

1965 Gates Radio Conpany

Quiney,

Illinois

Steam Powered Radio.Com

INDEX

1'16467,

FM

TOP-LEVEL

AMPLIFIER

PAGE

Specificn.tions

• • • • • • • • • • • • • • • • • • • • • • • •• • • • • • • • • • • • 1

Receiving

• . . . . . . . . . . . . . . . . . . . . . . . • • . • . . . . • • • • . . . • • 2

\~le

..

rre..nty

•.••.........•....•..

·• •• • •• • • • . • • • • • • . • • • • 2

Description••••·····•·•···•·•··•·••·••·•••••••••••

3

Instc.llation

. • . . . . . . . . . . . . . . . . . • . . . . • . . . . . . . • . . . . • 3

Preparation

of

System

for

Installation•··••••••

3

Installation

Mechanical

• •• • • • • •• • • • • • •.• • •• • • • • • 3

Mounting and

Wiring·••••····•·••·•···•••·•···••

4

Input·: Power • • • •• •• • • •• • ••• • •• • •• • • • • • •• •• • •• • •• 4

Adjustment

Procedure

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • •

Materials

and Equipment

Required·•····•··••·••·

Adjustment

Procedure

········•······•···•··••·•·

Operation••····•···•~·•········•·••·•••••••·•••

Proof

of

Performance

Tests

••••

,

•••

,

•••

,

•,.,

, • • • •

Theory

of

Operation·••·••·•····•·•······•·•·····••

Overmodulation

in

Fi'1

Transmitters

• • • • • • • • • • • • • •

Block

Diagram

••••••••••••••••••••••••••••

• • • •• •

Main

t

enanc

c

•••••••

.

•••••••••••••••••

, • • • • • • • • • •-• • • •

General

••.....•..••..•........•••••••••..

• • • • • •

Transistors

••••·•·••·••••••••••••••·••·••••••••

Gain,

Besponse

&

Dis~tion.Me.asurement

Tocbniques

•••••••

Parts

List

-

For

ordering

replacement

components••

Resistance

Chart

for

1\.m.plifier Board & Power

Supply

Board • •• • •

Parts

List

••••••••••••••

, , , •1

•••

-

•.,

••••

• • • • • • •

•,

• •

PHOTOGRAPHS:

DRAWINGS:

Figure

1

Figure

2

Figure

3

4

5

6

7

8

9

10

11

1-3

Figure

4

Block

Diagram

-

814

3365

001

Overall

Schematic.

852 6136 001

..-i-

FH

Top-Level

i\mplifier

Steam Powered Radio.Com

SPECIFICATIONS

FM

TOP-LEVEL

OVERMODULATION

PROTECTION

AMPLIFIER

TECHNICAL

DATA

PURPOSE:

MODE:

INPUTS:

GAIN:

RESPONSE:

DISTORTION:

NOISE

&

CROSSTALK:

.i\TTACK

&

RELEJ;.SE

TIME:

INPUT

LEVEL:

OUTPUT

LEVEL:

IMPED.illiCES:

LEVEL

CONTROLS:

POWER:

POWER

CONSUMPTION:

TRl..NSISTORS:

DIODES:

AMBIENT

TEr"IPER.i~TlDE:

Prevention

of

FM

overnodulation

by

oeans

of

frequency

dependent

peak

clipping.

Dual

channel,

stereophonic

or

two-channel

monophonic.

One

per

channel

(two

total).

28

db oaxir.1un.

+l

db,

30-15,000

cps

below

threshold

of

clipping.

- f

+3

,f

-

a.J-

to

e

t·

h

..

I

0.5%,

30-15,000

cps

below

threshold

of

clipping.

~

-75

db

or

better

below

+18

DBM

out.

-

08'

-

7f~

'i;

D(V1

Virtually

instantaneous.

-10

DBM

to

+24

DBM

(adjustable).

+18

DBM

after

a 6 db

isolation

pad

(adjustable).

Input,

600

olms

balanced

or

unbalanced.

Output,

600

ohos

balanced

or

unbalanced.

Continuously

variable

input

and

output

level

controls.

117

volts,

AC

50/60

cycles.

5

watts

naxinun.

16

-

2Nl307 3 -

2N1414

5 - 2N1306

1

-2Nl539

4 - 1N2069 4 -

1N67A

2

-1N710

zener

-20°

C

to

+60° C

(-4°

F

to

140°

F.)

-1-

Top-Level

JUJ.plifier

Steam Powered Radio.Com

SIZE:

SPECIFI

C.ATIONS

5¾"

x

19"

x

12".

Mounts

in

s,

tandard

191'

relay

cabinet.

WEIGHT:

25

lbs.

net

cubage

12.

FINISH:

CONTROLS:

TEST POINTS:

RECEIVING

45

lbs.

dowestic

pack.

Mediun

gloss

grey.

Each

channel:

Input

level,

output

level,

calibrate.

.i.'-

..

liwiter/operate

disable

switch

is

included

for

Proof

of

Perfornance

tests.

Adjust

level,

bias

adjust,

front

panel

test

points

are

provided.

ILIDediately

upon

receipt,

the

unit

should

be

carefully

unpacked

and

inspected

for

apparent

or

concealed

shipping

dru.1age.

In

case

of

danage

in

transportation

notify

the

delivering

carrier

at

once.

l,.fter

he

has

approved

the

dru1ago

report,

which

indicates

he

will

accept

your

billing

for

the

dru.iage,

order

new

parts

frou

Gates

Radio

Conpany,

Our

billing

of

these

parts

plus

transportation

expense

will

be

your

clain

to

the

trnnsportation

conpany.

W.ARRANTY

FM

Top-Level

is

covered

under

the

sto.ndnrd

Gates

Warranty,

a

copy

of

which

nay

be

had

on

request

fron

Gates

Radj_o

Conpany,

123

Haupshiro

Street,

Quincy,

Illinois

62301.

-2-

Top-Level

.Anplifier

Steam Powered Radio.Com

DESCRIPTION

r----.

The

Gates

FM

Top-Level

controls

high

frequency

peaks

which,

when

pre-eophasized

by

the

standard

FM

75

nicrosecond

curve,

would

cause

illegal

overnodulation

of

the

transnitter.

The

unit

is

a

dual

channel

device

that

can

be

operated

in

stereo

or

as

two

in-

dependent

single

channel

units

for

oonaural,

storecast,

or

tele-

vision

sound

applications.

The

awplifier,which

is

solid

state,

consists

of

a

regulated

power

supply

and

two

identical

anplifier

boards.

The

anplifier

section

contains

the

following:

an

input

anplifier

to

adjust

the

level

of

the

inconing

signal

and

FM

pre-

eophasis

filter

to

exactly

duplicate

the

signal

as

seen

by

the

transni

ttcr;

a

adjustable

clipper

which

acts

on

signals

in

excess

.

of

a

pre-set

level;

a

output

aoplifier

section

to

recover

filter

losses;

and

a

de-enphasis

filter

to

give

an

overall

nat

response

curve.

A drop-clown

panel

perEits

access

to

the

input

and

output;

level

controls,

calibrate

control

(clipping

level

adjust),

fuse,

and

operate

disable

switch.

This

switch

disables

the

clipper

for

Proof

of

Pcrfornance

tests.

Access

to

tho

top

and

botton

of

the

unit

is

ncconplishod

by

tho

use

of

1/4

turn

fasteners.

Input

o.nd

output

teroinations

are

nade

to

a

barrier

typo

terninal

strip

located

on

the

rear

of

tho

aIJ.plifier.

A

grounded

3-conductor

line

cord

is

supplied

with

the

unit.

INSTiJ.iLATI

ON

Preparation

of

Systeo

for

Installation

Prior

to

the

installation

of

the

Top-Level

it

is

necessary

to

check

with

sine

wave

and

adjust,

if

necessary,

the

opera.tion

of

tho

FM

nodulation

uonitor

to

insure

correct

flasher

calibration

with

tho

oodulation

noter.

Tho

channef

balance

in

a

stereo

systen

should

tlso

be

checked.

In

stereo

installations

the

audio

chain

should

bo

balanced

for

oquo..l

output

through

the

turntable

stereo

preanplifiors,

console

n.nd

liniter.

Installation

Mocha.nical

Tho

Top-Lovcl

should

electrically

feed

the

transnitter

after

the

peak

lini

tor.

It

is

rocoDDended

thnt

tho

Top-Level

be

insto.ll0d

at

the

trnnsnittor

sito

to

recover

losses

incurred

in

the

tele-

phone

pro

gr

on

lines.

Since

routine

adjustuent

is

unnccessc

.

ry,

a

transnittor

site

installation

is

satisfactory.

The

conventional

lir..iiter

nc.y

be

installed

either

at

tho

trnnsnitter

sito

or

o.t

the

studio.

Tho

FM

Top-Level

should

be

initially

installed

with

the

input

end

output

controls

nininWJ.

(countorclockwise).

Do

not

chnngo

calibrate

control.

Adjustuent

of

the

Top-Level

is

des-

cribed

in

the

section

titled

LDJUSTMENT

PROCEDURE.

-3- Top-Levol 1~1plificr

Steam Powered Radio.Com

Mounting

nnd

Wiring

The

unit

requires

5%"

of

panel

spac.c

in

a

s.t.andard

19''

r.elay

rack.

Input

and

output

toroinations

are

oade

at

the

barrier-typo

terninnl

strip

located

at

tho

renr

of

tho

unit.

The

various

in-

puts

and

outputs

nro

identified

on

the

rear

panol

and

µlso

on

the

schouatic

diagran.

Phase

relationships

have

been

uaintainod

with-

in

the

unit

with

the

input

and

output

phase

oarked

with

a

dot

on

the

barrier

strip

proper.

Us0

tho

clotted

ternino.l

for

tho

high

lead

of

the

audio

pair

and

proper

phQsing

will

bo

oo.intained.

Care

should

be

taken

to

toroinate

tho

shields

of

tho

input

and

output

cn.bling

at

one

end

only,

and

nn

appropriate

plo.ce

is

shown

on

tho

barrier

strip.

For

optinun

results

use

insulated

twisted

shielded

pcirs

such

as

Bolden

#8451

for

both

input

and

output

wir-

ing.

Individual

systeos

require

individual

ground

systeu

prac-

tices,

however,

avoid

ground

loops

for

bost

operation.

The

one

point

ground

systoo

is

nost

corn.10nly

usod

and

generally

offers

superior

results.

Ground

tho

oxtornal

ground

point

to

stntion

ground.

Tho

one

point

grounding

syster.1

requires

that

each

unit

of

an

audio

syston

have

its

01,·m

conductor

running

to

the

cannon

ground

point.

The

COLlilOn

point

should

be

conncctod

with

heavy

copper

strap

to

the

station

ground

and/or

oo..rth grc·und

to

give

the

systco

the

low-

est

possible

ground

reference.

Input

Power

In

order

to

cooply

with

recent

laws

of

sono

states

the

FM

Top-

Level

uses

a

three-prong

grounded

power

cord.

Tho

ground

in

tho

AC

distribution

systeo

nust

bo

properly

grounded

for

proper

operations,or

hun

nay

bo

induced

into

the

anplifier.

ADJUSTMENT

FROCEDURE

After

tho

FM

Tcp--Levol

has

been

installed

in

the

rack,

calibration

and

acljustncnt

I.lay

be

perfornod.

The

conplete

procedure

outlined

below

is

for

[t

stereo

instri.llation.

idjusting

the

left

channel.

For

Donauro.l

inst2.llation

or

dunl

channel

inst3.llat:i,on,

follow

Stops

l

through

8.

1"!1:1.teriD.ls

an9-:Eguipnont

Roguircd

1.

Volt-om

_

mctor

such

ns

a

iS,i::.1pso.n

269

O]';l.

Tr:LpJ.irtJ:;.

#6-yJ.

2.,

Modulation

i:.loni

tor

instruction

book.

3.

Screwdriver.

4.

.12" Jur

..1

por

with

standnrcl

tip

t o

fit

test

points

on

tho

Top-Lovel.

-4-

Top-Level Aopllfior

Steam Powered Radio.Com

Adjustuent

Procedure

1.

2.

4.

5.

6.

7.

8.

10.

Controls

Settings

-

Check

to

Dake

sure

that

all

input

and

output

controls

are

fully

counter-clockwise.

Switch

the

0:2KB.1l,.T:S/DISABLE

switch

to

OPERATE

and

plug

the

line

cord

into

a

AC

receptacle.

Peak

Liniter

Operation

-

Play

a

nonaural

record

or

tape

with

the

conventional

peak

liuiter

opera.ting

in

the

stereo

node

where

used.

The

liniter

should

work

nornally,

linit-

ing

about

5

to

6

DB.

Set

the

VOI-I

to

read

approxiraately

10

volts

DC

and

plug

it

into

th

e l

eft

clipper

bias

test

points

located

on

the

left

side

of

the

inside

front

panel

behind

the

front

door.

The

white

ter:.:1

.

inal

is

positive

and

the

black

terwinal

is

neg-

ative.

(See

FIGURE

1).

Calibrate

Setting

-

(Factory

adjusted).

Adjust

the

left

C.A.LIBR.ATE

control

until

the

VOr-1

reads

3.5

volts

DC.

Input

Level

Adjustuent

-

With

the

VOM

still

plugged

in

the

left

test

points,

increase

the

left

input

control

until

the

VOI-1

neter

needle

just

begins

to

indicate

a

slight

re-

duction

in

voltage.

DO

NOT

INCREASE

THE

INFUT

CONTROL

BEYOND

THE

FOINT

OF

INDICATION.

Now

adjust

the

left

cal-

ibrate

control

until

the

VOM

reads

4.1

volts

DC.,

.Adjust

the

FM

11odulation

nonitor

flas

he

r

to

read

at

the

desired

level

of

raodulation.

Increase

the

left

channel

output

control

until

the

nodula-

tion

nonitor

flasher

just

indicates,

then

back

it

off

slightly.

For

i:ionaural

or

separate

dual

chann

el

installation

onit

Steps

9

through

12

and

go

to

Step

13.

For

stereo

install-

ations

repeat

Steps

1

through

7

for

the

right

ch

annel

and

then

go

on

to

Steps

10

through

13.

(See

FIGURE

2

).

Stereo

Channel

Balance

-

Connect

the

bottou

white

ADJUST

LEVEL

test

points

together

with

the

12"

jun.per.

(See

FIGURE

3).

Set

the

VOE

for

about

10

volts

AC

and

plug

the

neter

into

the

two

top

black

ADJUST

test

points.

With

the

progran

level

tost

tone

of

1

KC

fed

fron

the

console

(this

could

be

a

1

ICC

or

400

c;ycle

test

tone

fron

a

test

record

or

signal

generator),

adjust

the

right

output

of

the

Top-

Level

until

the

VOM

is

at

nininun

reading.

It

now

indi-

cates

that

the

levels

in

the

right

and

left

channels

are

equal

and

the

channels

are

balanced.

11.

Switch

the

VOM

to

the

lowest

practical

AC

voltage

scale

and

adjust

the

right

output

of

the

Top-Level

for

nininUlu

reading

again.

12.

Leave

tho

jUDper

and

ueter

in

place.

-S-

Tnn-T,A~T

A1 An-n1

'i

f''i

A"I"'

Steam Powered Radio.Com

..

13.

Ad,iust

for

optimum

;eerformance

-

Play

several

monophonic

records

of

the

type

program

material

normally

encountered

in

your

station's

operation,

observing

the

modulation

monitor

flasher.

Carefully

adjust

the

left

and

right

channels

alternately

(in

stareo

installations)

in

small

increments

until

tho

peak

flasher

seldom,

if

evor,

lights.

It

will

be

necessary

to

play

several

styles

or

types

of

records

normally

encountered

in

everyday

usage

to

set

the

correct

output

feed

to

tho

transmitter.

NOTE:

Because

sine

wave

testing

will

not

react

in

the

s'aiiie"mannor

as

musical

peaks,

it

is

necessary

to

observe

tho

flasher

and

udjust

the

output

level

until

sctisfactory

modulation

levels

are

maintained.

It

is

now

necessary

to

readjust

the

stereo

balance

in

stereo

installations

when a

suit-

able

setting

is

achieved

(Steps

9-12).

IMPORTANT

NOTICE!

It

is

very

important

that

tho

station

engineer

observe

the

modulation

monitor

flasher

for

a

period

of

two

or

three

hours

in

order

to

make

sure

that

the

output

level

is

o.t

the

correct

setting.

Since

this

varies

slightly

from

musical

selection

to

musical

selection,

this

adjust-

ment

and

observation

must

bo

made.

Typical

test

records

for

this

purpose

should

preferably

bo

muted

trumpets

2nd

cymbrtl

crashes,

triancle

nnd

other

percussion

effects.

Those

o.ro

good

sources

of

typical

problem

passages

which

mny

be

used

in

adjusting

the

FM

Top-Level.

Qperation

The

Gates

FM

Top-Level

is

a

device

which

clips

high

frequency

penks

that

exceed

the

pre-emphasis

curve.

In

stations

that

desire

to

clip

only

random

peak

signals

rather

than

trying

to

maintain

tho

absolute

maximum

of

modulations,

slightly

lower

settings

of

tho

output

control

will

be

nocessnry.

It

must

be

rememborod

that

when

the

FM

Top-Lovol

acts

on

these

high

fre-

quency

sign~ls,

it

effectively

clips

them

and

while

the

effect

is

not

noticoo

.

blo

in

the

form

of

distortion,

it

does

reduce

slightly

tho

overall

frequency

response

of

that

signal.

Proof

of

Pcrfo:c:mo.ncc

Tests

After

tho

unit

hc..s

boon

adjusted

o.nd

bc..lnnced

for

stereo

oper-

ation

or

monaural

oporQtion,

no

additional

operator

attention

is

necessary.

Whon

running

Proof

of

Performance

checks

the

clipper

section

of

tho

unit

can

be

effectively

disabled

by

switching

the

OPERATE/DISABLE

switch

to

the

DISABLE

position.

The

clipping

bias

is

raised

to

a

level

well

above

that

signal

used

in

tho

audio

Proof

of

Forformance

tests.

No

re-adjustments

are

neces-

sary

and

o.ftor

tho

Proof

has

beon

completed,

the

Fl'1

Top-Level

can

be

rcturnocl

to

normal

operation

by

switching

the

unit

back

to

OPERATE.

-6-

FM

Top-Lovel

Amplifier

Gates M6467 Manuel utilisateur

Manuels Amplificateur populaires d'autres marques